JB/T 4365-1997 Special lubrication, shaft sealing and control oil system
Some standard content:
JB/T 4365--1997
Preface
This standard is equivalent to AP1614--1992 "Special Lubrication, Shaft Seal and Control Oil System". This standard is a revision of JB4365-86 "Lubrication, shaft sealing and regulating oil system for fans". Regarding the standards and related requirements cited by AP1614, any existing Chinese standards shall be subject to Chinese regulations. In order to clearly and systematically reflect the relevant standards and requirements of our country, the relevant provisions are marked with consecutive Arabic numerals in the upper corners to indicate the adoption of explanatory notes and are uniformly reflected in Appendix F (the appendix of the reminder).
When this standard adopts API614, a few technical contents such as oil purifier and viscosity grade are added. Appendix E (the appendix of prompts) has also been added.
For the ten standard containers involving the non-destructive testing content of ASME specifications, according to national conditions, this standard implements the provisions of the "Pressure Vessel Safety Technical Supervision Regulations".
The pipe thread connection of this standard is NPT thread. As long as it does not affect the connection with the user, the designer can also use (GB7306-87 "Pipe Thread Sealed with Threads".
This standard will be implemented from the date of implementation From now on, it will replace JB4365-86. This standard is proposed and centralized by the National Fan Standardization Technical Committee. The main drafters of this standard are: Li Fanggui, Chen Mingliang, Xiong Yujun, and Zhang Lihua. |JB/T4365—1997
API614 Preface
The purpose of this standard is based on the knowledge and experience accumulated by the manufacturers and users of lubricants, shaft seals and control oil systems. To provide a procurement specification to facilitate the manufacture and procurement of lubricating oils, shaft seals and control oil systems used in oil refining operations. The original purpose of the API 614 standard was to establish minimum mechanical requirements for machinery and equipment. One of the conflicting interests is that energy conservation is important and has become more important in all aspects of equipment design, use and operation. Therefore, at this stage, the path to energy improvement should be in the manufacturing plant. and users strive for. Selection methods that can lead to improved energy applications should be generated through thorough investigation. This is the reality of new equipment quotations, as the valuation of procurement options will increasingly depend on total lifetime costs. It is not just a matter of cost. In particular, equipment manufacturers are encouraged to adopt these provisions when improvements in energy efficiency and reductions in overall life cycle costs can be achieved through these means without compromising safety or reliability. The purchaser is required to specify certain details and features. Although it is recognized that the purchaser may request changes, deletions, or expansions of sections of this standard, it is respectfully recommended that such changes, deletions, or expansions be included as appendices to this standard and not be included in the emphasis. Writing or merging chapters of this standard into another complete standard
Publishing API standards helps standardize the procurement of equipment and materials. These standards are not meant to prohibit buyers or manufacturers from complying with technical specifications. Products not procured or manufactured to API standards. API publications may be used by anyone who wishes to do so. The Society has made every effort to ensure the accuracy and reliability of the data contained in this standard. However, the Society hereby disclaims any representation. No representative, guarantor or guarantor of this publication shall be responsible or liable for any loss or damage arising out of its use or in violation of any state, state or municipal laws or regulations. Publications.
Revision suggestions are solicited and should be directed to American Petroleum Institute Refining Division: 1220 LShret, N.W., Washington, DC 20005. 120
1 Scope
People's Republic of China Machinery Industry standard
Specialized lubrication, shaft sealing and control oil system JB/T4365-1997
Replaces JB4365--86
This standard specifies a dedicated lubricating oil system, shaft sealing oil Minimum requirements for system and control oil systems. These systems are suitable for equipment such as compressors, gear transmissions, pumps and drivers and are not suitable for internal combustion engines. Special statement:
a)·When the buyer agrees in the order form or related data sheet that the oil system shall be supplied according to JB/T4365 standard, this standard shall be used first, and other standards shall not be given priority. any terms of the content. Note: The terms marked with "." in this standard are determined by the buyer or the buyer provides further information. The determined information should be filled in the data sheet (see Appendix B), otherwise. This should be stated in the quotation or order form.
b) If there is any conflict between this standard and the inquiry letter or order form, the information in the order form shall prevail. ) Appendix A gives a schematic diagram of typical system components and a schematic diagram of a typical complete lubricating oil system, shaft seal oil system and control oil system diagram. These schematic diagrams illustrate the general rationale and requirements of this standard, including helping the buyer to select Reasonable system. Before the order takes effect, the buyer and the seller negotiate to determine a system acceptable to both parties. d)·This standard stipulates the scope of supply, quality level or grade (material) requirements of components to be determined by the buyer. System type, general layout plan (including the azimuth plan and main view of the oil station), the occupied space of the oil station and other requirements. e)·This standard stipulates that "design\inquiry" should be avoided in the buyer's technical documents (such as design power, design pressure, design temperature or design speed). This term is limited to equipment designers and manufacturers. f) This standard specifies the corresponding metric dimensions. The seller can propose changes to the design (7.1 Quotation requirements), and with the agreement of the buyer and seller, "equivalent" inch dimensions, fasteners and flanges can be provided. 2 Quoted standards ||tt ||The provisions contained in the following standards constitute provisions of this standard by reference in this standard. The editions indicated are valid at the time of publication of this standard. Practical changes to standards, regulations and specifications that occur after the inquiry shall be governed by. The buyer and seller negotiate and determine. GB150--89 steel pressure vessel
GB151--89 steel shell and tube heat exchanger
GB 196-81
Ordinary thread basic ruler||tt ||GB 197--81
General thread tolerance and fit
Stainless steel hot-rolled steel plate
GB 4237--92
GB 7233- 87
Ultrasonic flaw detection and quality rating standards for steel castings GB 7306—87
Pipe threads sealed with threads
GB9112～9131-88 steel pipe flanges
(except GB9127)|| tt||GB9443--88 Rating method for penetrant inspection and defect marks of steel castings GB9444-88 Magnetic particle inspection and quality rating method for steel castings GB 11120--89L-TSA turbine oil
GB/T12459--90 Steel butt welded seamless pipe fittings Ministry of Machinery Industry of the People's Republic of China approved 1997-04-15 1998-01-01 Buy Shi
121
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GB /T12716—9160° tapered pipe thread
GB/T14691·-93 Technical drawing font
JB/T4365--1997
GB50058--92 Design of electrical equipment in explosive and fire hazardous environments Specification HGJ8—87 Chemical pipeline design specification
JB 4709 -92
Welding regulations for steel pressure vessels
JB4730-94 Non-destructive testing of pressure vessels
JB/T 5262— 91
Technical conditions for turbine oil purification device
JB/T 6764 -93
General purpose industrial steam turbine
JB/T 6888—93
JB/ T 6890—93
Technical conditions for steel castings for fans
Technical conditions for defect repair welding of carbon steel castings for fans Industrial steam turbine flexible couplings
ZB K54 030---89 | | tt | status conditions. 3.2 Locking time: After the driver trips (trips), it takes time to cut off (valve close) a certain device of the system (such as a compressor) and depressurize the system.
3.3 Booster pump: An oil pump that absorbs the oil discharged from another oil pump and provides a higher pressure oil. 3.4 Idling time: After the driver is tripped, the time required for the equipment to rotate to a stationary state. 3.5 Components: Machinery and complete sets of components, such as oil tanks, oil pumps, oil coolers, oil filters, valves and instruments, etc., which are all components of the oil system.
3.6. Fuel station: The components and control elements of the entire fuel supply system are assembled into an integral unit or connected to the base. In this arrangement, the buyer only needs to make external connections.
3.7 Continuous flow switching valve: From one element to its two branch pipes, the inlet and outlet flows can be changed at the same time without changing the continuous flow of the full flow through this valve to the equipment.
3.8 Control oil: The oil required to operate the relays, servo mechanisms and power oil plugs on the main equipment. 3.9 Full cooling time: After the driver is tripped, maintain the oil circulation of the equipment to prevent thermal effects. The time it takes to cause damage. 3.10 Accident oil pump: When the main oil pump and backup oil pump cannot work, an independent oil pump with sufficient pressure and flow to ensure the safe shutdown of the equipment.
3.11i
Equipment: The main machine for which the oil system serves. Instrument panel: an open bracket or metal plate used to support and install measuring instrument switches and other instruments. 3.12
In situ: Installed on equipment or oil stations or in the immediate vicinity of them. 3.13
3.14 Main oil pump: The oil pump that is usually in running state. 3.15 Maximum allowable working pressure: Manufactured when transporting the specified fluid at the specified temperature! The maximum continuous pressure a station or component is designed to withstand.
3.16 Maximum sealing pressure: during specified rest or operating conditions (including start-up and shutdown). The highest pressure expected in a sealed space.
3.17 Composite device: total oil supply system. The components of the system are available as independent assembled units. The buyer of such a device only needs to make connections between devices and externally.
3.18 Normal flow: the total amount of oil required for equipment components (such as bearings, seals, couplings) to be controlled in a steady state, but does not include the instantaneous amount of oil used for control or the bypass oil directly returned to the tank. quantity. 3.19 Normal disconnection and normal connection: Automatically controlled electric switches or valves are in the idle position and the designated disconnection (de-energization) position. When the equipment is running, the position of the device is not necessarily consistent with the idle position of the device. 122
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3.20 Normal operating point: the expected regular operation and the point at which the best efficiency can be achieved. This point is usually the point where the seller guarantees that the performance is within the tolerance range specified in this standard. point.
3.21 Assembled device: The total oil supply system, the components are installed on a single base. The unit is complete in all respects including controls and instrumentation.
3.22
3.23
Dial: Instrument cabinet used to install display and protection measuring instruments, switches and other instruments. Remote control device: away from the equipment or gas station, especially the device in the control room. 3.24bZxz.net
Set pressure: Under static conditions, the maximum pressure that the system may reach. 3.25 Car
Shaft driven pump: An oil pump driven by a certain shaft of the main engine that supplies oil from the oil supply system. 3.26 Stop point: A certain point with preset parameter values ??that requires automatic or manual shutdown of the system. 3.27 One-way dedicated oil system: Usually when there is no backup machine, the oil system is designed and configured to continuously and continuously provide lubricating oil to the equipment and provide control oil in emergency situations. 3.28 Standby pump: usually an oil pump that is stopped or running without load (empty). The oil pump can be automatically or manually switched to the specified operating speed immediately and run continuously.
3.29 Standby equipment: The passband is idle or no-load equipment that can be started immediately automatically or manually and run continuously 3.30 Responsibility of the device: Coordination of technical aspects of the equipment and various auxiliary systems included in the purchase order Consistent accountability. Responsibilities for these factors such as required power, speed, direction of rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing systems, material test reports, instrumentation, piping and component tests should be confirmed. 3.31 Shutdown oil level (oil level A in Figure 1): the highest oil level that the oil in the tank can reach when the entire system is shut down, glass tube sleeve length
(minimum 25mm)
A||tt ||B
C
Suction arrangement of air change pump
Oil level
Maximum operating oil level
Minimum operating oil level||tt| |Suction loss oil level
Immersed rotary pump
Man-made rotary pump
Pump suction oil level
Figure 1 Oil tank oil level and glass oil level gauge Details
2 Maximum operating oil level (oil level B): the highest oil level allowed to be reached during normal operation of the equipment. 3.32
3.33 Minimum operating oil level (oil level C): the lowest oil level allowed to be reached during normal operation of the equipment. T
Manufacturer’s standard glass tube length
(minimum 50.8mm)
3.34 suction loss oil level (oil level D): higher than the pump suction oil level (oil level E ) oil level. At this oil level the pump loses its ability to start. The pump suction oil level (E) depends on the requirements of the pump inlet vortex and effective positive pressure head. 3.35 Oil filling capacity: the total capacity below the shutdown oil level. 6Normal operating range: Any position between the highest and lowest operating oil level. The low oil level alarm should operate at the lowest operating oil level. 3.36
3.37
3.38
Detention capacity: the capacity below the minimum operating oil level. Residence time: The time required to release air or gas mixed in the oil. 9Stop capacity: the capacity between the shutdown oil level and the highest operating oil level. 3.39
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3.40 Working capacity: the capacity between the minimum operating oil level and the suction loss oil level. 4Basic design
4.1 Overview
4.1.1 The service life of the equipment (including auxiliary equipment) designed and constructed in accordance with this standard is at least 20 years, and it has been operated continuously for at least 3 years. This is already Accepted design principles.
4.1.2 The oil system shall be suitable for the "single-pass dedicated oil system" defined in 3.27. The oil system can be designed as an independent oil station: if the buyer agrees, the oil system can also be designed as an integral part of the base of the equipment. The design should allow for switchover and shutdown between primary and backup components that maintain system operation without interrupting the operation of the oil system or equipment served by the oil system. 4.1.3 The seller shall bear the responsibility for engineering coordination of the equipment and all auxiliary systems included in the order order. 4.1.4 Materials 1 specified by national standards or not lower than industry standards may be used in the quotation, including the grade of the material. When relevant standards cannot be used, the seller should list the mechanical properties, chemical composition, test requirements and other technical requirements of the material in the quotation. 4.1.5, the buyer should clearly specify the normal operating point of the equipment on the data sheet. Noise control of all equipment provided shall be a joint effort between the buyer and seller. Unless otherwise specified, the equipment provided by the seller shall 4.1.6 -
comply with the sound power level determined by the buyer and seller or API61521. 4.1.7·Buyer Whether the sealing oil and lubricating oil systems are separated should be specified in the data sheet. If separation is specified, the seller shall indicate in the quotation the measures to prevent oil leakage between the two systems. When a common system is used to supply oil to more than two pieces of equipment (such as compressors, gears or motors), the buyer will provide all sellers with mutual arrangements for the oil supply of the equipment based on the company's oil system 4.1.8·
Inter-company agreement specifies the characteristics of the oil output on the data sheet. Note
1 Usually, the lubricant used in the public oil system is hydrocarbon oil, which is equivalent to GB11120 medium viscosity grade 32# high-quality turbine oil 33. 2. In order to meet the load speed, vibration, temperature and When considering factors such as oil contamination by sulfides and carbon oxides, the seller can also use GB11120 medium viscosity grade 46# high-quality turbine oil 3bl. 4.1.9 The designed oil system shall supply oil to all equipment specified by the buyer. 4.1.10 When the filtered oil is returned to the tank by bypass, in order to minimize the possible electrostatic voltage (static charge), the oil should be returned from upstream of the oil filter. If oil is required to be returned downstream from the oil filter, the oil should have a residence time of at least 30 seconds in the circulation line in order to fully eliminate any charge (or electrostatic charge) before the oil is discharged into the tank. 4.1.11·The designed sealing oil system shall meet the entire range of equipment operating conditions specified by the buyer. At least the following conditions should be included: a) Set pressure:
b) Process pressure relief valve setting value;
c) Workshop test and on-site commissioning;
d) Starting conditions.
4.1.12·The buyer shall specify whether the equipment is installed indoors (with or without heating) or outdoors (with or without a shed) and the climate and environmental conditions necessary for the operation of the equipment (including maximum temperature and minimum temperature). temperature, abnormal humidity and dust or corrosion problems). The device and its auxiliary equipment shall be suitable for operation under such specified conditions. The seller shall list in the quotation the special protections or operating restrictions that the buyer shall provide or observe as a guide to the buyer (see 7.1h). The buyer should make specific requirements regarding long-term storage. 4.1.13·Component layout, including piping, valve locations, buyer’s joints and auxiliary equipment, shall be mutually negotiated between the buyer and seller. The arrangement will allow sufficient clear space and safe access to facilitate component operation and maintenance, and allow for testing and replacement of the system without downtime. If possible, the purchaser shall specify its minimum requirements for the space around components and for safe passages (especially those close to oil coolers, oil filters, and manual valves and for safe passages).
Motors, electrical components and electrical installations shall comply with the electrical area classification (class, class and group) specified on the data sheet and shall comply with 4.1.14 -
1 See Appendix F for future situations Similar. 124
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GB50058 and other relevant standards and local specifications proposed by the buyer. 4.1.15·The oil pump, oil filter, primary oil filter, oil cooler, drain collector and all components and tanks containing pressure oil installed around the oil tank shall be made of steel. If, with the special permission of the purchaser, the components may be immersed in the tank, they may be constructed of cast iron. 4.1.16 Vent valves, discharge valves and piping should be provided so that spare parts can be drained, cleaned and replaced during equipment operation. 4.7.17, the purchaser shall specify when, where, and how double shutoffs and drains are required to isolate a component (see Figure A23).
If the buyer stipulates, the oil cooler, oil filter, high position 4.1.18*g can be manufactured according to the standards specified in "Pressure Vessel Safety Technical Supervision Regulations" 5-
Fuel tank, emission collector, Accumulators and other pressure vessels should comply with the requirements of this standard and should be marked with the standard (see 4.9 requirements for high-level fuel tanks).
4.1.19 On a test bench and on a permanent basis, oil stations should conduct acceptance inspections in accordance with specified standards. Once installed, the performance of the station shall be the joint responsibility of the buyer and seller.
4.1.20·The seller shall recommend to the buyer or the buyer and seller mutually agree to ensure the supply of suitable lubricating oil and sealing oil when the lubricating oil and sealing oil supply system, or both systems, fail for repair. Special precautions are necessary. These measures include emergency oil pumps, accumulators, high-level oil tanks, and special devices for safety protection during equipment rotation. These measures will cover downtime, full cooling time and lockout time defined by the buyer. Buyers and sellers should negotiate the system and its components. 4.1.21 Stop valves that may interrupt the supply of oil to the equipment should not be installed downstream of the oil filter unless agreed to by the purchaser or if the stop valve is part of a component assembly and bypass arrangement.
4.1.22 Except for pipelines (see 4.13.3), the welding of pressure-bearing parts and any welding and repair of different metals should be carried out by coal workers who have obtained the pressure vessel welding certificate in accordance with JB/T4709." . 4.1.23 In addition to the requirements of 4.1.22 and 4.13.3, the buyer may specify that 100% radiographic inspection, magnetic particle inspection or liquid penetrant inspection is required for the welded parts (see 6.2.1.3). 4.2 Base||tt| 4.2.1 The oil system should be designed as a single or assembled (combined) oil station; or an oil station arranged according to the buyer's specifications. The assembled device should have a component that can install the entire system and related valves. Steel structural base of the manifold valve. The main components (pump, oil filter, oil cooler and oil tank) shall be mounted directly on the steel structural frame. 4.2.2 Unless otherwise specified, the assembled base shall have a or. The size of multiple funnel-shaped discharge joints should be at least 38mm. The base, components and covers should be arranged appropriately to ensure clean discharge and avoid residual liquid retention. 4.2.3 The base should be designed with at least four lifting lugs. After the oil on the components installed on it and all the pipelines is drained, the lifting device will not cause permanent deformation or other damage to the base or the components installed on it. 4.2.4 Unless otherwise specified, the base should be covered with anti-skid gratings. All passages and working surfaces. 4.2.5 Unless otherwise specified, there shall be at least one opening or hole in each partition wall of all bases through which the effective area of ??each opening shall be not less than 129 cm. , and each side is not less than 100mm, each grouting opening is easy to access, there is no interference from components and pipelines, there is no danger of walking and falling, and there should be a 13mm high steel plate edge through each opening to prevent accumulation of oil. or water enters the grouting port. Each spacing cavity shall have a vent hole of at least 13mm diameter. The location of the grouting port and vent hole shall be mutually agreed upon.
4.2.6 If specified, the base shall be suitable for use in the grouting port. The design of this base shall be mutually agreed between the buyer and seller unless otherwise specified, except as specified in GB150 and HGJ8. Welding other than that included (including welding on the base, non-pressure nozzles, covers and control panels) shall comply with the general carbon steel and structural steel welding regulations or AWSD1.1. 4.2.8 When specified on the data sheet When epoxy resin grouting, the seller shall pre-coat catalyzed epoxy primer on all grouting surfaces of the mounting plate (the surface shall be degreased and shiny). The epoxy primer shall be compatible with the epoxy resin grouting. The buyer submits instructions for on-site preparation of epoxy primer.
4.2.9 The bottom of the base shall be spread between structural members. When the base is installed on a concrete foundation, the base shall be 125| | tt | Agreed, otherwise the tank should be separated from the base of the equipment. The tank should be rigid enough to prevent collapse and vibration. Components fixed to the tank with screws should be provided with backing plates, but the screw holes should not penetrate the tank plate. 4.3.2 Anti-fouling and waterproofing
4.3.2.1. The fuel tank should be sealed to prevent the intrusion of dirt and water. The opening flange on the top of the box should be 25mm higher than the box surface, and a seal should be added. When agreed to by the purchaser, the oil pump, oil cooler or oil filter may be mounted on top of the oil tank. The top of the fuel tank should have flanges and grooves for drainage, with one or more drainage holes with a nominal size of at least 40mm and equipped with plugs. 4.3.2.2 The slope of the top of the oil tank should be at least 1*100. 4.3.3 Oil interface and internal pipe
4.3.3.1 The position of all oil return interfaces should be as far away from the suction port of the pump as possible to avoid obstructing the pump inlet. Oil flow. 4.3.3.2 All oil return interfaces open to the atmosphere (including oil filling pipe doors) should return oil above the maximum operating oil level (through undisturbed pipes with loose openings or degassing trays). As shown in Figure A22, the non-flexible oil pipe should have a bottom baffle to prevent sediment from rising at the bottom of the tank. 4.3.3.3 All pressure return connections (including safety valve oil lines) should be separated and oil should be drained through internal lines below the pump suction loss oil level. Pressure oil should not be returned to the undisturbed pipe or degassing tray, and the inner pipeline should have bottom baffles to prevent sediment from rising at the bottom of the tank. 4.3.3.4 The pump suction interface should be located at the higher end near the bottom of the inclined tank. 4.3.3.5 Except as specified in 4.3.9, the interfaces of fuel tank pipelines shall be connected by flanges. 4.3.4 Manholes and discharge ports
In order to ensure clean discharge, the bottom of the fuel tank should be continuously inclined, with an inclination of at least 6:1000. The flanged discharge connection provided (with a valve and a blind flange) has a nominal size of at least 50mm. Manhole openings shall be provided for easy access to inspection and cleaning of internal parts.
4.3.5 Characteristics and accessories
The oil tank shall have the following characteristics and accessories:
a) It has the ability to completely settle water and impurities, avoid frequent oil filling, and provide sufficient oil when the entire system is shut down. of margin volume. b) It has the ability to exhaust air and minimize impurities flowing to the suction port of each pump. c) Glass oil level gauge equipped with a reflective welded bushing (stainless steel welded bushing and carbon steel cover), with a measuring range from at least 25mm above the shutdown oil level to 50mm below the pump suction loss oil level. The glass oil level gauge should be as far away from the oil return line as possible (see 4.3.3.1). The oil level gauge can display the maximum operating oil level, the minimum operating oil level, the shutdown oil level and the suction loss oil level. d) The nominal size of the oil filling port is at least 50mm, and it can close automatically (usually closed by a spring).It is equipped with a stainless steel fine-mesh strainer with a flow area equal to twice the internal area of ??the pipe. e) The nominal size of the vent nozzle equipped with a blind flange is at least 50mm. f) The nominal size of the weatherproof and corrosion-resistant filter breather cover is at least 50mm (see note for containers storing sealing oil). Note: ·On containers storing sealing oil, special discharge holes must be provided for all gas flows that leak from the seal and come through the oil discharge pipeline. The seller shall provide the buyer with the dimensions and specifications of the holes. When the buyer stipulates, a vent interface with an overvoltage protection device should be provided, and the size of the device should be determined through mutual negotiation between the buyer and the seller.
g) Non-enclosed liner.
4.3.6 Volume and structural form
4.3.6.1 Oil level definition 3.31~3.40.
4.3.6.2 Criteria for determining the size of the oil tank
4.3.6.2.1 The working capacity between oil level C and oil level D should be at least 5 minutes of normal oil volume. 4.3.6.2.2 The detention time should be no less than 8 minutes, based on the normal oil volume and detention capacity. 4.3.6.2.3 The shutdown capacity will include all components, bearings and seal chambers, control components, and pipeline discharge return tanks provided by the seller. The total oil volume of 126
JB/T4365--1997
. This shutdown capacity should be at least plus an additional capacity of 10% of the intermediate pipe capacity. Note: Shutdown may cause the drain pipe inside the fuel tank to become clogged. 4.3.6.2.4 In the sealing oil system, the height between the lowest and highest operating oil levels should be at least 50mm; when the seal grinding reaches the maximum allowable gap, the amount of oil shall be based on the sealing oil consumption rate estimated by the manufacturer. Enough for at least 3 days of operation without refueling through the tank. 4.3.6.2.5 In the lubricating oil system, the capacity between the minimum and maximum operating oil levels should be at least 50mm in the height direction of the oil tank. 4.3.6.2.6 The free surface area of ??the oil in the tank should be at least 1L/mmin of normal flow, which is 61.3cm2. 4.3.7 Heating
4.3.7.1·When specified, it should be provided on the outside of the tank Removable steam heating element or thermostatically controlled immersion electric heater. The heater should be equipped with a "GB3280.GB4237 medium austenitic stainless steel sheath" to heat the oil in the tank before starting in cold weather. The heating device should be able to heat the oil in the tank from the specified minimum on-site ambient temperature to The starting temperature specified by the equipment manufacturer. If an unmanned electric heater is used, its maximum power density is 2.32W/cm. The heating element in contact with oil should be lined with austenitic stainless steel, and copper or copper alloy materials cannot be used with oil. Contact. Unless otherwise specified, the heat loss of the oil tank during heating shall be determined by the minimum on-site ambient temperature and wind speed of 4.5m/s. Note: When the oil level drops. When the oil level is lower than the minimum operating oil level, the purchaser shall provide power-off interlock protection for immersed electric heaters. 4.3.7.2 When specified, the immersed electric heater shall be installed in a sealed tube to facilitate operation. The heater can be disassembled. 4.3.8·Insulation device
When specified by the Italian side, the fuel tank shall be provided with a clamp for installing the insulation layer. 4.3.9·Plug-in connector.
Each fuel tank should be provided with two threaded and plug-in connectors above the parking oil level, with a size of at least 25mm. These two connectors are used to connect purge gas, replenish oil and purifier oil. return. One of the joints shall be set to ensure effective purging of the purge gas in the discharge direction
4. 10
Oil purifier device
When specified by the purchaser. , an oil purifier (refer to JB/T5262) ??467 should be provided, and a connecting flange, valve and blind flange with a nominal size of 25mm should be provided below the minimum operating oil level (see Figure A22) when specified by the buyer. The seller should provide a siphon-type bad pipe with a top opening and a flow-breaking function inside the oil tank. The maximum diameter of the hole is 6mm. The opening of the ring pipe will protect the oil level and prevent the oil level from falling due to the action of the purifier. to 50mn below the minimum operating oil level. 4.3.11 Welding
The pipes, backing plates, and joints should be welded on both the inner and outer sides to eliminate the sources of pits, corrosion, and contamination. If full penetration welding is used, The tank wall to the top can be welded externally. The internal welding should be polished and dented using wire brushing or other methods to provide a complete weld modification surface
4.3.12 Special parts
When specified by the purchaser, the following shall be provided on top of the tank: a) Movable vertical ladder with handrails
b) Railings around the top of the tank
c) Provided on walkways and maintenance areas. Anti-skid plate (grilled plate, diamond plate or galvanized mesh plate) 4.3.13·Material
Unless otherwise specified, the fuel tank and all accessories welded to the fuel tank shall be Cr-Ni austenitic stainless steel ( GB3280, GB4237)° or made of materials agreed between the buyer and the seller. The pipe joints shall be made according to the provisions of 4.13. 4.3.14 Grounding
Two grounding clips or pads shall be welded to the tank before final cleaning inside the tank. . Buyer can provide detailed drawings of clamps or backing plates. The backing plate should accommodate M12 bolts.
4.4 Pump and driver
4.4.1·The oil system includes the main oil pump and the backup oil pump. The main and backup oil pumps should be identical and suitable for continuous operation. Buyer shall stipulate 127
10
Oil purifier device
When the buyer stipulates, an oil purifier (refer to JB/T5262) ??467 should be installed, and a pipe with a nominal size of 25mm should be provided below the minimum operating oil level. Flanges, valves and blind flanges (see Figure A22). When the buyer stipulates, the seller shall provide a top-opening and flow-breaking siphon-type bad pipe on the inside of the fuel tank. The maximum diameter of the hole is 6mm. The opening of the annular pipe will protect the oil level and prevent it from falling below 50mn below the minimum operating oil level due to the action of the purifier. 4.3.11 Welding
Nozzles, pads, and joints should be welded on both the inner and outer sides to eliminate the sources of pits, corrosion, and pollution. If full penetration welding is used, the tank wall to the top can be welded externally. Internal welds should be ground and pitted with a wire brush or other method to provide a complete weld finish.
4.3.12 Special parts
When specified by the buyer, the following parts shall be provided on the top of the fuel tank: a) Movable vertical ladder with handrails.
b) Railing around the top of the tank.
c) Provide anti-skid plates (textured, diamond or galvanized mesh) on walkways and maintenance areas. 4.3.13·Material
Unless otherwise specified, the fuel tank and all accessories welded to the fuel tank shall be made of Cr-Ni austenitic stainless steel (GB3280, GB4237) or materials agreed between the buyer and the seller. Pipe joints shall be Manufactured in accordance with 4.13. 4.3.14 Grounding
Two grounding clips or pads should be welded to the tank before final cleaning of the inside of the tank. Buyer can provide detailed drawings of clamps or backing plates. The backing plate should accommodate M12 bolts.
4.4 Pump and driver
4.4.1·The oil system includes the main oil pump and the backup oil pump. The main and backup oil pumps should be identical and suitable for continuous operation. Buyer shall stipulate 127
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Oil purifier device
When the buyer stipulates, an oil purifier (refer to JB/T5262) ??467 should be installed, and a pipe with a nominal size of 25mm should be provided below the minimum operating oil level. Flanges, valves and blind flanges (see Figure A22). When the buyer stipulates, the seller shall provide a top-opening and flow-breaking siphon-type bad pipe on the inside of the fuel tank. The maximum diameter of the hole is 6mm. The opening of the annular pipe will protect the oil level and prevent it from falling below 50mn below the minimum operating oil level due to the action of the purifier. 4.3.11 Welding
Nozzles, pads, and joints should be welded on both the inner and outer sides to eliminate the sources of pits, corrosion, and pollution. If full penetration welding is used, the tank wall to the top can be welded externally. Internal welds should be ground and pitted with a wire brush or other method to provide a complete weld finish.
4.3.12 Special parts
When specified by the buyer, the following parts shall be provided on the top of the fuel tank: a) Movable vertical ladder with handrails.
b) Railing around the top of the tank.
c) Provide anti-skid plates (textured, diamond or galvanized mesh) on walkways and maintenance areas. 4.3.13·Material
Unless otherwise specified, the fuel tank and all accessories welded to the fuel tank shall be made of Cr-Ni austenitic stainless steel (GB3280, GB4237) or materials agreed between the buyer and the seller. Pipe joints shall be Manufactured in accordance with 4.13. 4.3.14 Grounding
Two grounding clips or pads should be welded to the tank before final cleaning of the inside of the tank. Buyer can provide detailed drawings of clamps or backing plates. The backing plate should accommodate M12 bolts.
4.4 Pump and driver
4.4.1·The oil system includes the main oil pump and the backup oil pump. The main and backup oil pumps should be identical and suitable for continuous operation. Buyer shall stipulate 127
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