HG 3040-1988 Guide for the selection, storage, use and maintenance of rubber and plastic hoses and hose assemblies
Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber and plastics hoses and hose assemblies-Guide to the selection, storage, use and maintenanceUDC 621.643.3/.4
.004.2/.5
HC/T3040-1988（1997)
Replaces GB9576-88
20302324
This standard equivalently adopts the draft international standard ISO/DIS8331-1986 "Rubber and plastics hoses and hose assemblies-Guide to storage, use and maintenance".
1 Subject content and scope of application
1 Selection,
This standard sets out a series of requirements for the selection, storage, use and maintenance of rubber, plastic hoses and hose assemblies before use.
This standard applies to various types of rubber, plastic hoses and hose assemblies. The purpose of this standard is to make the best use of hoses and hose assemblies according to their inherent functions to achieve the longest service life. 2 Reference standards
GB5563 Hydraulic test method for hoses
GB9572 Determination of resistance of rubber, plastic hoses and hose assemblies 3 Selection criteria
Users should note that at any time, hoses and hose assemblies that meet national or international standards should be selected according to the intended application. If there are specific requirements or the necessary technical information cannot be found, the supply and demand parties should negotiate to resolve. When selecting hoses and hose assemblies according to specific uses, the following points should be considered: a. Working environment:
Ambient temperature: Atmospheric conditions: External contact with other materials. b. Conveying medium:
Liquid; gas; solid; mixture of the above media. c. Conveying method:
Pressure discharge
Vacuum suction, including flow velocity;
Gravity flow
The flowing medium is a mixture of solid and liquid, solid and gas. d. Working conditions:
Pressure and temperature of the conveyed material; frequency of use. e. Assembly:
Degree of bending; vibration of the system; danger of damage due to impact and friction; use of the correct connection type. 4 Storage Instructions
4.1 General Instructions
During storage, especially long-term storage and exposure to certain conditions (such as media, etc.), the physical properties of hoses and hose assemblies will change, causing them to lose some of their best properties before use. Therefore, storage conditions should provide the best protection and the lowest degree of deterioration for hoses and hose assemblies. 4.2 Storage Period
The storage time should be as short as possible. The turnover of inventory products must comply with the "first in, first out" rule. If stored for a long time, the product should be tested for performance before use.
4.3 Temperature
Whenever possible, the storage temperature should be between 0 and 35°C, preferably around 15°C. During storage, the temperature of the product shall not exceed 50℃ or be lower than -30℃, nor shall it fluctuate abnormally. 4.4 Humidity
Relative humidity shall not exceed 65%.
4.5 Light
Products should be stored in a dark place away from sunlight and strong artificial light sources. If there are windows or light holes in the product storage area, they should be covered with red, orange or white covers. 4.6 Ozone
Since ozone can have a harmful effect on rubber products, devices that can produce ozone shall not be parked in the storage area. For example, mercury vapor lamps, high-voltage electrical devices, motors or other devices that can produce sparks or discharges. 4.7 Storage environment
Rubber and plastic hoses shall not be placed together with certain products (especially solvents, oils, fats, acids and disinfectants) or exposed to the volatile gases of these products. Also, do not contact with certain metals, such as copper, iron and manganese, which can have a harmful effect on certain rubber products.
4.8 Heat Sources
Hose products should be stored away from heat sources. There should be a sufficient distance between the product and the heat source to ensure compliance with the provisions of Article 4.3. 4.9 Electric and Magnetic Fields
Hose product storage areas should be away from equipment that can generate electric and magnetic fields. Because changes or fluctuations in electric and magnetic fields can generate magnetic induction currents in metal joints and cause heat generation. 4.10 Storage Methods
Hose products should be stored in a way that does not subject them to excessive stress, elongation or deformation, and should avoid contact with sharp objects or the ground. Whenever possible, use storage racks to store hose products. Coiled hoses or hose assemblies should be stored flat and preferably not stacked. If stacking is unavoidable, the height of the stack should be limited, that is, it should be limited to not causing permanent deformation of the hoses stacked at the bottom. Coiled hose products must not be hung on wooden stakes.
Hose and hose assemblies supplied in a straight state should be stored flat and not bent. Large-diameter hoses used in the petroleum industry should be capped at the ends.
4.11 Rodents
Hose products should be protected from rodents and, if there is such a risk, the products should be provided with appropriate protection. 4.12 Removal from storage
Care should be taken to ensure that hose products leaving the warehouse are stored under correct storage conditions and consistent with their intended use. Therefore, it is important to mark the different types of hose products in stock. For hose assemblies with non-permanent pipe joints, such as hose assemblies with adjustable card box-clamp structures, they should be checked to ensure the reliable performance of the pipe joints. 4.13 Return to storage
Before the used hose assemblies are returned to storage, the materials being transported should be emptied. Particular attention should be paid to hoses used to transport chemicals, explosive, flammable or corrosive materials. After cleaning and before returning to storage, the hose should be inspected to determine its suitability for continued use.
5 Use and maintenance
5.1 Management
HG/T3040-1988 (1997)
Hoses and hose assemblies should be carefully managed. They must not be dragged on sharp or abrasive surfaces, nor kinked or compressed, for example, wheels must not be allowed to run over the hose. 5.2 Pressure
The pressure (including pulse pressure) filled into the hose product must not exceed the specified design working pressure. 5.3 Temperature
Hose products must not be used at temperatures (including the temperature of the material being conveyed and the ambient temperature) outside the temperature range specified or recommended by the hose manufacturer.
5.4 Conveyed materials
Hoses and hose assemblies can only be used to convey the materials for which they are designed. If there is any doubt about their suitability, ask the hose manufacturer. When conveying potentially hazardous materials, such as toxic, corrosive, explosive, or flammable materials, care should be taken to minimize the effects of spills. It is recommended that hoses and hose assemblies not be filled with the material being conveyed when not in use.
5.5 Environment
Hose and hose assemblies shall not be used in environments other than those for which they are designed. If there is any doubt about their suitability or if they are to be used under special or different conditions, the hose manufacturer should be consulted. 5.6 Bend Radius
Hose and hose assemblies shall not be used at a bend radius less than the minimum specified or recommended by the hose manufacturer, otherwise the passage of the conveyed material will be restricted. Bending or twisting near hose connectors should be avoided, as continuous bending in these areas will fatigue the reinforcement layer of the hose and cause premature failure of the hose (see Figure 1). 5.7 Torsional Stress
Hose and hose assemblies are generally not suitable for working in a twisted state. 5.8 Tensile Stress
Hose and hose assemblies may only be subjected to tensile stress when specially designed. If you have any doubts about the suitability of the hose, you can consult the hose manufacturer.
5.9 Vibration
Vibration can cause fatigue and heat generation in the hose and hose assembly, especially near the pipe joint connection, which can cause premature damage to the hose assembly. You should find out from the hose manufacturer whether the hose designed and produced can withstand vibration. 5.10 End pipe joints
Before installing the end pipe joints, check whether the pipe joints and hoses match and whether the installation method is reliable. If in doubt, check with the hose and end pipe joint manufacturers. The edges of the pipe joints should be smooth, and the dimensions of the tailpieces, ferrules and other accessories must be guaranteed to ensure effective sealing when properly installed. The buckling pressure and the torque of the clamp must be controlled, otherwise insufficient or excessive pressure and torque will cause premature damage to the assembly. In order to facilitate the insertion of the pipe joint into the hose, it is recommended to use clean water or soapy water. Unless the hose is specified to transport materials containing oil, grease or solvents, the above substances must not be used. When inserting the hose into the pipe joint, be careful not to twist the hose.
5.11 Leakage
After installing the end pipe joints, it is required to conduct a hydraulic test on the hose assembly with the test pressure specified by the hose in GB5563 to check that there is no leakage at the joint and the pipe joint and hose do not slip off. 5.12 Electrical performance test
If there are requirements for the electrical performance of hoses and hose assemblies, they can be tested and determined regularly according to GB9572. 27
Wrong installation
HC/T3040-1988（1997）
Correct installation
Hydraulic hose bending diagram
5.13 Fixed assembly
HG/T3040-198S1997)
Used to assemble fixed hoses and hose assemblies, whenever possible. They should be supported and fixed with appropriate clamps. It must be ensured that the hose moves normally (i.e. expands and moves) under pressure or vacuum, and the change in hose length and distortion shall not be restricted by the installation of the clamp. 5.14 Moving Parts
If hoses and hose assemblies are used as moving parts or couplings in assemblies, their length should be appropriate and not too long. When in motion, the hoses should not be subjected to vibration loads, clamping, friction, excessive bending or excessive tensile or torsional stresses. 5.15 Marking
If the hoses are to be marked with items specified in the hose standards or other marks, it is required not to mark them directly with paints and inks, but to mark them with adhesive tape to avoid the solvents used to produce these paints and inks being incompatible with the rubber of the hose outer layer. 5.16 Maintenance
Unless otherwise required by relevant rules, standards or contracts, hoses and hose assemblies should be tested or inspected regularly to ensure that they are suitable for continued use. Special attention should be paid to the conditions at and near the hose connections, as well as the performance degradation caused by normal aging of the hoses or damage caused by use under abnormal conditions, abuse or accidents. Hoses with the following defects are disqualified from use: a. Perforation, rupture, tear, exposed reinforcement layer, ozone cracking: b. Local deformation, blistering, expansion under pressure; c. Soft or hard patches on the hose.
When the hose is marked with an expiration date, it must be monitored even if the hose does not show any performance degradation. 5.17 Repair of hoses
Generally speaking, hoses should not be repaired if they are broken. However, if the hose end is damaged and the undamaged hose portion is long enough, the damaged portion of the hose can be cut off and the pipe joint can be reinstalled. After installation, the hose assembly should be retested. Whenever repair is possible, such as large-diameter hoses used in the oil industry, the economic benefits are considerable. After repair, the technical indicators of the hose manufacturer must be strictly adhered to and the hose must be retested. If necessary, the electrical performance test of the hose should also be included under the hose test pressure. 6 Welding and gas cutting hoses
The gases used for welding and gas cutting are: oxygen, acetylene, liquefied petroleum gas (LPG) and non-flammable gases (such as argon, cyanide, etc.). The inner rubber layer of the hose that transports such gases should avoid reaction with these gases. In order to prevent confusion and ensure correct use, the colors of the outer rubber layer of the hose are specified as follows: Blue: oxygen delivery
Red: acetylene delivery
Orange: liquefied petroleum gas (LPG) delivery
Black: non-combustible inert gas
In any case, these hoses shall not be used in other occasions, nor shall they deliver gases other than those marked by this color. Note: Welding and gas cutting hoses intended for the delivery of liquefied petroleum gas (LPG), that is, hoses with an orange outer rubber layer, are not suitable for use in household equipment using propane as fuel.
7 Steam hoses
Unless otherwise specified or specified, steam hoses can only be used to deliver saturated steam with a direct relationship between temperature and pressure. If it is necessary to deliver superheated steam (there is no direct relationship between temperature and pressure), the hose manufacturer should be consulted because the hose will be subjected to different stresses. When the steam hose is not used continuously or has a cooling stage during use, a thermal shock test should be carried out before it is used again to determine whether it can continue to be used in a shorter period of time. In order to avoid the serious consequences of steam burns, appropriate protective measures must be taken to ensure personal safety and minimize the adverse effects of the explosion of hoses or hose assemblies. :29
8 Hoses for conveying food
1988(1997)
Hoses and hose assemblies for conveying food shall generally comply with the statutory hygiene regulations. The inner rubber of the hose shall not react with the food so as to cause food contamination. Hoses and hose assemblies may only convey the specified foods. The cleaning materials used, the cleaning procedures and the frequency must be strictly observed.
9 Hoses for conveying abrasive materials
To obtain the maximum service life, hoses and hose assemblies for conveying abrasive materials should be kept straight as far as possible. If bending is unavoidable, the bending radius should be as large as possible, because a small bending radius or a coiled hose will inevitably cause a flow effect, resulting in rapid local wear of the inner rubber of the hose and premature failure. It is required to use an external connector, so that since there is no need to insert a core tube into the hose to reduce the flow effect of the material, the wear of the hose by the abrasive material is reduced to a minimum.
The electrical performance of this type of hose assembly should be checked regularly to ensure that the static electricity generated by the friction between the conveyed material and the hose wall is effectively discharged, and to avoid premature damage to the hose due to arc perforation caused by the inability to discharge static electricity. 10 Hoses for conveying corrosive materials
Agricultural chemicals, acids and certain chemical products are corrosive or erosive products. There are specific regulations for hoses and hose assemblies to convey such materials. If the conveyed material is not within the provisions of the hose standard or other technical specifications, or the concentration, temperature or pressure value exceeds the specified range, it should be negotiated with the hose manufacturer. Be sure to avoid the material from being retained in the hose, especially solvents and emulsions, because the final precipitation will cause the concentration of the material to exceed the allowable limit, which will corrode and deteriorate the inner rubber. In order to avoid this situation, it is recommended that the hose should be emptied and rinsed whenever possible after the hose is used. Considering that the consequences of a failure are serious, appropriate protective measures must be taken to minimize the consequences of a hose or hose assembly rupture.
11 Hoses for conveying flammable materials
In my country, there are regulations for the storage and transportation of flammable materials including liquid hydrocarbons (gasoline, kerosene and diesel) and liquefied hydrocarbons (liquefied petroleum gas). When these regulations involve hoses for exhausting and sucking flammable materials, they must be strictly followed. Hoses and hose assemblies should be inspected regularly, especially the electrical properties, to ensure that they are suitable for continued use. It is recommended to empty the hose when not in use.
When using hoses and hose assemblies to convey liquid hydrocarbons, it is particularly important to note that the content of aromatic hydrocarbons conveyed must be within the range specified in the hose specifications.
12 Hoses for automobiles
Hoses and hose assemblies used in automobiles are susceptible to the following environments and protective measures should be taken. a. The hose is installed in a position, such as under the hood, where it may come into contact with fuel, lubricating oil, battery acid, etc. or be susceptible to heat generated by the engine, high ozone atmosphere; b. The vehicle is operated under excessively high or low overflow and humidity conditions, or is driven on roads with sand, mud, gravel, ice and snow; c. Movement and vibration between the various parts connecting the hose and the hose assembly in the vehicle. In the first two cases, it is recommended to shield the hose and the hose assembly whenever possible. For installation with large bends or the assembly points are not on the same plane, molded hoses should be used as much as possible. In any case, the bending radius of the hose shall not be less than the specified bending radius. Care should be taken to minimize the stretching of the hose and twisting should be avoided. The gap between the hose and adjacent parts must be such that the hose will not come into contact with adjacent parts due to vibration or moving surfaces and hot spots or cause friction with adjacent parts during vehicle operation. For this purpose, the length of hoses and hose assemblies should generally be the minimum required to provide the required length. Whenever possible, the hoses should be secured with suitable clamps.
The following special circumstances should also be considered:
Coolant hoses should be sufficiently flexible to ensure that they are connected to the radiator without excessive stress. Brake hoses and hose assemblies should be of sufficient length to ensure that they are not excessively stressed under extreme conditions of use, so as to maintain effective performance and pay attention to the following points:
a. Spacing with other components, especially under extreme vehicle driving conditions, such as full braking of the vehicle. b. High and low positions caused by movement relative to fixed points due to vehicle bouncing, turning during changes of direction, etc. 13 Hydraulic hoses
13.1 General
This chapter describes hoses and hose assemblies used in hydraulic and gas fluid power systems. They will be subjected to pulsating pressure or flexure or a combination of both. They are usually supplied to the user as hose assemblies, that is, hoses correctly assembled with suitable end pipe fittings to meet the needs of an established system. In addition to the requirements in Chapter 4, care must be taken to keep hose assemblies clean, as foreign particles entering the hose can damage the equipment to which the hose is installed. When stored, all hoses and hose assemblies must be sealed at both ends to prevent foreign matter from entering the hose. The basic application of hydraulic hose assemblies is to provide satisfactory fluid flow (usually at higher pressures), and these applications require flexible connections. Hydraulic hose assemblies must not be used in a straight state, because this will cause tensile stress due to the natural displacement of the hose under pressure (generally +2% and -4% of the hose length), so they should be used in a curved form. Figure 1 shows some prescribed forms and forms that should be avoided when installing hoses. When a curved installation form is adopted, the part of the hose adjacent to the pipe joint should have sufficient length to accommodate the movement of the part. 13.2 Points to be observed
13.2.1 Flexibility
Sufficient flexibility and clearance with adjacent components must be provided to accommodate the displacement of the equipment during vibration and movement. The configuration and installation of the hose should be appropriate so that it does not contact hot spots or rub against adjacent components during use. 13.2.2 Length
The length of the hose assembly shall be kept to the minimum required to ensure adequate flexibility without inducing tensile stress. 13.2.3 Bends
The hose shall be configured so that its bend radius is as large as possible and in no case less than the specified minimum value. Consideration shall be given to any bending of the hose that may occur during normal operation of the equipment in which the hose assembly is configured and ensure compliance with the relevant bending requirements. Whenever possible, suitable supports shall be provided for the hose assembly to prevent additional bending caused by the weight of the hose assembly and stresses at the joints.
13.2.4 Vibration
Stress due to vibration should be reduced to a minimum and avoided as much as possible. If the hose assembly is connected to a rigid component, suitable clamps should be used and as close to the connection as possible. 13.2.5 Elongation
Whether it is when the equipment points move or in other circumstances, it should be ensured that the hose is not subjected to tensile stress. 13.2.6 Heat
Radiant heat to the hose, such as near the exhaust system, should be avoided. In high temperature locations, the hose can be protected by a heat shield or insulating material.
13.2.7 Accessibility
Hoses and hose assemblies should be assembled in easily accessible places to facilitate assembly and maintenance operations. 31
F/r3040-19s8(1097)
, Installation Indicator
Correct Installation Form
Incorrect Installation Form
Installation Indicator
Correct Installation Form
Correct Installation Form
Incorrect Installation Form
The high stress caused here
Can cause premature failure of the product
Figure 2 Hose Assembly Installation (Assembly)
The high stress caused here
Can cause premature failure of the product
Incorrect Installation Form
Incorrect Installation Form
Note: This figure only shows some installation shapes of hose assemblies under actual use conditions. The installation shapes required by some test specifications may be different from the above. This only emphasizes the suitability for specific test conditions and does not mean that these installation shapes can be adopted in general applications. 32
13.2.8 Assembly preparation
HG/T3040-1988(1997)
Before installing the hose and hose assembly, an inspection should be carried out to ensure that the inner wall of the hose is clean and free of obstructions (for example, there should be no foreign matter, burrs or burrs on the surface of the pipe joint). Surface defects, especially those on the conical core of the pipe joint, will cause the risk of leakage and should be avoided.
13.2.9 Assembly
When assembling the hose and hose assembly, it must be ensured that no twisting occurs. To ensure this, the hose is marked along its longitudinal length when it is manufactured (see Figure 2).
When connecting each end of the hose and hose assembly to its fixed position, it should be loosened to Get a natural placement. The marking line on the hose should be checked to determine whether it is twisted and whether the pipe head connection is too tight. After the pipe head is finally tightened, the marking line on the hose should be checked again. If the torque load value is specified for the pipe joint or clamp, it must not be exceeded. 13.2.10 Repair
Since hydraulic hoses operate under high pressure, personal injury or death may occur if damaged. Therefore, precise control is required in the preparation of the hose end, the use of the correct type of pipe joint and the appropriate structure (based on the type of pipe joint used) when assembling the assembly. It is prohibited to repair hydraulic hoses. 14 Fire hose
14.1 Overview
The hoses and hose assemblies mentioned in this chapter are those used to transport water and foam solutions in firefighting situations. Flat and conventional hoses for liquids. Hoses should be manufactured according to the different environments in which they are used, and it must be ensured that the correct type is used, i.e. civil, industrial, land, marine, etc. fire hoses.
In addition, the working pressure of the fire protection system, the possibility of contact with corrosive substances, burning debris and hot surfaces, and errors in the use regulations of the hoses will cause the hoses to be damaged prematurely. Relevant laws and regulations and contractual provisions should also be strictly observed. 14.2 Key points for compliance
14.2.1 Storage
Before use, hoses and hose assemblies should be placed in a dry, well-ventilated place. 14.2.2 Assembly·
Whether installed in a fixed position or installed on a vehicle, ensure that the hoses and hose assemblies are placed in an airy place. The hose should be in a state of air flow and not in contact with other parts that may cause friction. In order to minimize the permanent deformation of the hose, the hose should be regularly unwound from the coil and rewound in the opposite direction. In order to prevent damage or permanent deformation, the folded flat hose should be regularly folded and laid flat, the folding point should be changed, and then folded again.
14.2.3 Use
When using, vehicles should be avoided from running over the hose to avoid limiting the flow rate or pressure in the hose. When the hose is unwound from the coiled or folded state and laid flat along the ground, it should not be dragged on rough surfaces or sharp objects. When the hose is twisted, it should not be pulled with excessive force. When the hose contacts the friction surface, especially near the suction pump, a protective bushing should be used. 14.2.4 Pressurization
Before pressurization, the hose and hose assembly should be straightened as much as possible without twisting or bending. The nozzle and valve should be opened and closed slowly to prevent sudden pressure changes and water spraying out to hurt people. 14.2.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a submerged, double-floating or suspended manner. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :bzxz.net
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's specifications must also be followed. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of on-site hoses
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If a wooden bracket is used, the bracket must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.7 Accessibility
Hoses and hose assemblies should be installed in easily accessible places to facilitate assembly and maintenance operations. 31
F/r3040-19s8(1097)
, Installation indicator line
Correct installation form
Incorrect installation form
Installation indicator line
Correct installation form
Correct installation form
Incorrect installation form
High stress caused here
Can cause premature failure of the product
Figure 2 Hose assembly installation (assembly)
High stress caused here
Can cause premature failure of the product
Incorrect installation form
Incorrect installation form
Note: This figure only shows some installation shapes of hose assemblies under actual use conditions. The installation shapes required by some test specifications may be different from the above. This only emphasizes that they are suitable for specific test conditions and does not mean that these installation shapes can be used in general applications. 32
13.2.8 Assembly preparation
HG/T3040-1988(1997)
Before installing the hose and hose assembly, an inspection should be carried out to ensure that the inner wall of the hose is clean and free of blockages (for example, there should be no foreign matter, burrs or burrs on the surface of the pipe joint). Surface defects, especially those on the tapered core of the pipe joint, will cause the risk of leakage and should be avoided.
13.2.9 Assembly
When assembling hoses and hose assemblies, it must be ensured that no twisting occurs. In order to ensure this, marks are made along the longitudinal length of the hose when it is manufactured (see Figure 2).
When connecting each end of the hose and hose assembly to its fixed position, it should be loosened to Get a natural placement. The marking line on the hose should be checked to determine whether it is twisted and whether the pipe head connection is too tight. After the pipe head is finally tightened, the marking line on the hose should be checked again. If the torque load value is specified for the pipe joint or clamp, it must not be exceeded. 13.2.10 Repair
Since hydraulic hoses operate under high pressure, personal injury or death may occur if damaged. Therefore, precise control is required in the preparation of the hose end, the use of the correct type of pipe joint and the appropriate structure (based on the type of pipe joint used) when assembling the assembly. It is prohibited to repair hydraulic hoses. 14 Fire hose
14.1 Overview
The hoses and hose assemblies mentioned in this chapter are those used to transport water and foam solutions in firefighting situations. Flat and conventional hoses for liquids. Hoses should be manufactured according to the different environments in which they are used, and it must be ensured that the correct type is used, i.e. civil, industrial, land, marine, etc. fire hoses.
In addition, the working pressure of the fire protection system, the possibility of contact with corrosive substances, burning debris and hot surfaces, and errors in the use regulations of the hoses will cause the hoses to be damaged prematurely. Relevant laws and regulations and contractual provisions should also be strictly observed. 14.2 Key points for compliance
14.2.1 Storage
Before use, hoses and hose assemblies should be placed in a dry, well-ventilated place. 14.2.2 Assembly·
Whether installed in a fixed position or on a vehicle, ensure that the hoses and hose assemblies are placed in an airy place. The hose should be in a state of air flow and not in contact with other parts that may cause friction. In order to minimize the permanent deformation of the hose, the hose should be regularly unwound from the coil and rewound in the opposite direction. In order to prevent damage or permanent deformation, the folded flat hose should be regularly folded and laid flat, the folding point should be changed, and then folded again.
14.2.3 Use
When using, vehicles should be avoided from running over the hose to avoid limiting the flow rate or pressure in the hose. When the hose is unwound from the coiled or folded state and laid flat along the ground, it should not be dragged on rough surfaces or sharp objects. When the hose is twisted, it should not be pulled with excessive force. When the hose contacts the friction surface, especially near the suction pump, a protective bushing should be used. 14.2.4 Pressurization
Before pressurization, the hose and hose assembly should be straightened as much as possible without twisting or bending. The nozzle and valve should be opened and closed slowly to prevent sudden pressure changes and water spraying out to hurt people. 14.2.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a submerged, double-floating or suspended manner. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's technical requirements must also be complied with. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of on-site hoses
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If a wooden bracket is used, the bracket must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.7 Accessibility
Hoses and hose assemblies should be installed in easily accessible places to facilitate assembly and maintenance operations. 31
F/r3040-19s8(1097)
, Installation indicator line
Correct installation form
Incorrect installation form
Installation indicator line
Correct installation form
Correct installation form
Incorrect installation form
High stress caused here
Can cause premature failure of the product
Figure 2 Hose assembly installation (assembly)
High stress caused here
Can cause premature failure of the product
Incorrect installation form
Incorrect installation form
Note: This figure only shows some installation shapes of hose assemblies under actual use conditions. The installation shapes required by some test specifications may be different from the above. This only emphasizes that they are suitable for specific test conditions and does not mean that these installation shapes can be used in general applications. 32
13.2.8 Assembly preparation
HG/T3040-1988(1997)
Before installing the hose and hose assembly, an inspection should be carried out to ensure that the inner wall of the hose is clean and free of blockages (for example, there should be no foreign matter, burrs or burrs on the surface of the pipe joint). Surface defects, especially those on the tapered core of the pipe joint, will cause the risk of leakage and should be avoided.
13.2.9 Assembly
When assembling hoses and hose assemblies, it must be ensured that no twisting occurs. In order to ensure this, marks are made along the longitudinal length of the hose when it is manufactured (see Figure 2).
When connecting each end of the hose and hose assembly to its fixed position, it should be loosened to Get a natural placement. The marking line on the hose should be checked to determine whether it is twisted and whether the pipe head connection is too tight. After the pipe head is finally tightened, the marking line on the hose should be checked again. If the torque load value is specified for the pipe joint or clamp, it must not be exceeded. 13.2.10 Repair
Since hydraulic hoses operate under high pressure, personal injury or death may occur if damaged. Therefore, precise control is required in the preparation of the hose end, the use of the correct type of pipe joint and the appropriate structure (based on the type of pipe joint used) when assembling the assembly. It is prohibited to repair hydraulic hoses. 14 Fire hose
14.1 Overview
The hoses and hose assemblies mentioned in this chapter are those used to transport water and foam solutions in firefighting situations. Flat and conventional hoses for liquids. Hoses should be manufactured according to the different environments in which they are used, and it must be ensured that the correct type is used, i.e. civil, industrial, land, marine, etc. fire hoses.
In addition, the working pressure of the fire protection system, the possibility of contact with corrosive substances, burning debris and hot surfaces, and errors in the use regulations of the hoses will cause the hoses to be damaged prematurely. Relevant laws and regulations and contractual provisions should also be strictly observed. 14.2 Key points for compliance
14.2.1 Storage
Before use, hoses and hose assemblies should be placed in a dry, well-ventilated place. 14.2.2 Assembly·
Whether installed in a fixed position or installed on a vehicle, ensure that the hoses and hose assemblies are placed in an airy place. The hose should be in a state of air flow and not in contact with other parts that may cause friction. In order to minimize the permanent deformation of the hose, the hose should be regularly unwound from the coil and rewound in the opposite direction. In order to prevent damage or permanent deformation, the folded flat hose should be regularly folded and laid flat, the folding point should be changed, and then folded again.
14.2.3 Use
When using, vehicles should be avoided from running over the hose to avoid limiting the flow rate or pressure in the hose. When the hose is unwound from the coiled or folded state and laid flat along the ground, it should not be dragged on rough surfaces or sharp objects. When the hose is twisted, it should not be pulled with excessive force. When the hose contacts the friction surface, especially near the suction pump, a protective bushing should be used. 14.2.4 Pressurization
Before pressurization, the hose and hose assembly should be straightened as much as possible without twisting or bending. The nozzle and valve should be opened and closed slowly to prevent sudden pressure changes and water spraying out to hurt people. 14.2.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a submerged, double-floating or suspended manner. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's technical requirements must also be complied with. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of on-site hoses
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If a wooden bracket is used, the bracket must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.9 Assembly
When assembling hoses and hose assemblies, it is necessary to ensure that no twisting occurs. To ensure this, the hoses are marked along their length when they are manufactured (see Figure 2).
When each end of the hose and hose assembly is connected to its fixed position, it should be relaxed to obtain a natural position. The markings on the hose should be checked for twisting and the pipe head connection should not be too tight. After the final tightening of the pipe head, the markings on the hose should be checked again. If the torque load value is specified for the pipe joint or clamp, it must not be exceeded. 13.2.10 Repair
Since hydraulic hoses operate under high pressure and damage may cause personal injury or death, precise control is required in the preparation of the hose ends, the use of the correct type of pipe joints and the appropriate structure (depending on the type of pipe joints used) when assembling them. It is forbidden to repair hydraulic hoses. 14 Fire hose
14.1 Overview
The hoses and hose assemblies mentioned in this chapter refer to flat and conventional hoses for conveying water and foam solutions in firefighting situations. Hoses should be manufactured according to different environments of use, and the correct type must be used, i.e., fire hoses for civil, industrial, land, and marine use.
In addition, the working pressure of the firefighting system, the possibility of contact with corrosive substances, burning debris, and hot surfaces must be considered. Mistakes in the use of hoses will lead to premature damage to the hoses. Relevant laws, regulations, and contractual provisions should also be strictly observed. 14.2 Key points to comply with
14.2.1 Storage
Before use, hoses and hose assemblies should be placed in a dry, well-ventilated place. 14.2.2 Assembly
Whether installed in a fixed position or on a vehicle, ensure that the hoses and hose assemblies are placed in a state of air circulation and do not contact other parts that may cause friction. In order to minimize permanent deformation of the hose, the hose should be periodically unwound from the coil and rewound in the opposite direction. In order to prevent damage or permanent deformation, the folded flat hose should be periodically folded and laid flat, the folding point should be changed, and then folded again.
14.2.3 Use
When using, vehicles should be prevented from running over the hose to avoid limiting the flow rate or pressure in the hose. When the hose is unwound from the coiled or folded state and laid flat along the ground, it should not be dragged on rough surfaces or sharp objects. When the hose is twisted, it should not be pulled with excessive force. Protective sleeves should be used when the hose contacts friction surfaces, especially near the suction pump. 14.2.4 Pressurization
Before pressurization, the hose and hose assembly should be straightened as much as possible without twisting or bending. The nozzle and valve should be opened and closed slowly to prevent sudden pressure changes and water spraying out to injure people. 14.2.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a submerged, double-floating or suspended manner. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's technical requirements must also be complied with. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of on-site hoses
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If a wooden bracket is used, the bracket must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.9 Assembly
When assembling hoses and hose assemblies, it is necessary to ensure that no twisting occurs. To ensure this, the hoses are marked along their length when they are manufactured (see Figure 2).
When each end of the hose and hose assembly is connected to its fixed position, it should be relaxed to obtain a natural position. The markings on the hose should be checked for twisting and the pipe head connection should not be too tight. After the final tightening of the pipe head, the markings on the hose should be checked again. If the torque load value is specified for the pipe joint or clamp, it must not be exceeded. 13.2.10 Repair
Since hydraulic hoses operate under high pressure and damage may cause personal injury or death, precise control is required in the preparation of the hose ends, the use of the correct type of pipe joints and the appropriate structure (depending on the type of pipe joints used) when assembling them. It is forbidden to repair hydraulic hoses. 14 Fire hose
14.1 Overview
The hoses and hose assemblies mentioned in this chapter refer to flat and conventional hoses for conveying water and foam solutions in firefighting situations. Hoses should be manufactured according to different environments of use, and the correct type must be used, i.e., fire hoses for civil, industrial, land, and marine use.
In addition, the working pressure of the firefighting system, the possibility of contact with corrosive substances, burning debris, and hot surfaces must be considered. Mistakes in the use of hoses will lead to premature damage to the hoses. Relevant laws, regulations, and contractual provisions should also be strictly observed. 14.2 Key points to comply with
14.2.1 Storage
Before use, hoses and hose assemblies should be placed in a dry, well-ventilated place. 14.2.2 Assembly
Whether installed in a fixed position or on a vehicle, ensure that the hoses and hose assemblies are placed in a state of air circulation and do not contact other parts that may cause friction. In order to minimize permanent deformation of the hose, the hose should be periodically unwound from the coil and rewound in the opposite direction. In order to prevent damage or permanent deformation, the folded flat hose should be periodically folded and laid flat, the folding point should be changed, and then folded again.
14.2.3 Use
When using, vehicles should be prevented from running over the hose to avoid limiting the flow rate or pressure in the hose. When the hose is unwound from the coiled or folded state and laid flat along the ground, it should not be dragged on rough surfaces or sharp objects. When the hose is twisted, it should not be pulled with excessive force. Protective sleeves should be used when the hose contacts friction surfaces, especially near the suction pump. 14.2.4 Pressurization
Before pressurization, the hose and hose assembly should be straightened as much as possible without twisting or bending. The nozzle and valve should be opened and closed slowly to prevent sudden pressure changes and water spraying out to injure people. 14.2.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a submerged, double-floating or suspended manner. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's technical requirements must also be complied with. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of hoses on site
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If wooden brackets are used, the brackets must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it is recommended to conduct a hydraulic test in accordance with GB5563. ·33·
HC/T3040-1988（1997）
Whether the hose and hose assembly have been used or not, they should be inspected and tested at least once a year. 15 Hoses and hose assemblies for the petroleum industry 15.1 Overview
This chapter refers to hoses and hose assemblies used in the petroleum industry to transport large quantities of liquid petroleum products. They can transport petroleum products from ship to ship or ship to shore in a way that is immersed in water, double floating or suspended on the water surface. Hoses and hose assemblies for transporting petroleum products by land or rail tanker trucks are covered in Chapters 3, 4, 5 and 11 of this standard.
The inner diameter of such hoses is generally larger than that of hoses used in ordinary industry, and the transport capacity and use environment are also different. Therefore, in addition to complying with the general requirements of Chapters 3, 4 and 5, there are special requirements for their storage, management and repair. Reference can be made to the relevant national, international, manufacturer and oil company specifications. 15.2 Points to be observed in particular
15.2.1 Storage
When hoses and hose assemblies are placed outdoors, they must be protected from atmospheric damage. Hoses supplied in a straight state, especially those with large diameters with molded pipe fittings, should always be properly supported and always have end pipes installed (see Figure 3).
15.2.2 Management
Large diameter hoses and hose assemblies supplied in a straightened state should be properly supported or braced when handled, especially when hoisted (see Figure 3). :
15.2.3 Repair
Hoses, especially hose reinforcements, are not normally repaired (see 5.17). However, large diameter hoses and hoses with high production costs may be repaired locally. Where repairs are permitted (which must comply with statutory regulations and the requirements of the insurer), the hose manufacturer's technical requirements must also be complied with. After repair, hoses and hose assemblies need to be retested and, if necessary, electrical performance tests should be carried out.
Instructions for use:
1 The specific requirements in ISO/DIS8331-1986 also include reference to the OCIMF Guide and the Guide to Inspection and Testing of Floating Moorings.
Management, storage and maintenance of on-site hoses
Support the ends of the hoses with a special frame
Additional instructions:
HG300USS0
The ends are sealed (preferably with holes). If a wooden bracket is used, the bracket must not be treated with drip-proof or spray-coated materials that may have harmful effects. Figure 3 Management of hoses during transportation
This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wang Baozhu, Yan Songfeng, and Wang Weixiang.5 Maintenance
After use, drain the hose and hose assembly, clean (inside and outside), dry, and check the hose and hose assembly for defects.
If the hose is used in contact with chemical products or is subjected to great stress, it is required to conduct a hydraulic test on the hose after use to ensure that it is suitable for future use. Unless otherwise specified, it
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