JB 6898-1997 Safety rules for the use of cryogenic liquid storage and transportation equipment
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB6898-1997
Cryogenic Liquid Storage and Transportation Equipment
1997-03-04 Issued
Safety Rules for Use
1997-10-01 Implementation
Ministry of Machinery Industry of the People's Republic of China
JB6898-1997
This standard amends JB6898-93 "Safety Rules for Use of Cryogenic Liquid Storage Equipment" and is a mandatory standard. The scope of application of the standard adds provisions for reference and use of carbon dioxide liquid storage and transportation equipment: 1. The relevant contents of the safety requirements and measures for the use of cryogenic liquid storage and transportation equipment are amended; 2. The requirements for the detection of acetylene content in liquid oxygen in containers and tank truck containers and the provisions for the detection of oxygen content in the air in places with poor ventilation and suffocation hazards are supplemented. This standard will replace JB6898-93 from the date of entry into force. This standard is proposed and managed by the Technical Committee for Standardization of Gas Separation and Liquefaction Equipment of the Ministry of Machinery Industry. The drafting units of this standard are Hangzhou Oxygen Generator Group Co., Ltd. and Hangzhou Oxygen Generator Research Institute. The main drafters of this standard are Fan Guanghan and Chen Yongliang. 1 Scope
Standards of the Machinery Industry of the People's Republic of China
Safety Rules for the Use of Cryogenic Liquid Storage and Transportation Equipment JB6898-1997
Replaces JB6898-93
This standard specifies the safety requirements, measures and accident handling of cryogenic liquid storage and transportation equipment (hereinafter referred to as equipment). This standard applies to cryogenic liquid storage and transportation equipment for oxygen, nitrogen and argon cryogenic liquid containers (hereinafter referred to as containers) and tank trucks. This standard can be used as a reference for carbon dioxide liquid storage and transportation equipment. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GBJ1687
GB2894—88www.bzxz.net
Code for Fire Protection of Building Design (1995 Revised Edition) Safety Signs
GB50030—91 Code for Design of Oxygen Stations
GB50057—94 Code for Lightning Protection Design of Buildings The "Regulations on Safety Technical Supervision of Pressure Vessels", "Regulations on Inspection of In-use Pressure Vessels", "Regulations on Registration and Management of Pressure Vessels", "Regulations on Safety Supervision of Liquefied Gas Tank Trucks" promulgated by the Ministry of Labor 3 Characteristics and Hazards of Liquid Oxygen, Liquid Nitrogen and Liquid Argon 3.1 Liquid oxygen, liquid nitrogen and liquid argon are all cryogenic liquefied gases. At a pressure of 101.325 kPa, the boiling point of liquid oxygen is -182.83℃: the boiling point of liquid nitrogen is -195.65℃: the boiling point of liquid argon is -185.71℃. When in contact with human skin and eyes, it can cause frostbite (cold burns). 3.2 When cryogenic liquids evaporate into gas, their volume will expand rapidly. At 0℃ and 101.325kPa, 1L of liquid evaporates into gaseous oxygen, which is 800L: nitrogen, which is 647L: argon, which is 780L. In a closed container, the pressure increases due to the vaporization of the liquid, which can easily cause the container to be overpressured. 3.3 Liquid oxygen and gaseous oxygen are strong combustion aids. 3.3.1 When liquid oxygen is close to combustibles, it is very easy to cause combustion hazards when encountering open flames. 3.3.2 When liquid oxygen comes into contact with combustibles, it is easy to cause explosion hazards due to impact: when liquid oxygen is mixed with combustibles, there is a potential explosion hazard. 3.3.3 When liquid oxygen evaporates into gaseous oxygen, it can be adsorbed by fabrics such as clothes, and it is easy to cause flash combustion hazards when encountering fire sources. 3.4 Nitrogen and argon are colorless, odorless, non-toxic, non-flammable inert gases with strong suffocation properties, which can cause suffocation hazards. 4 Safety requirements and measures
4.1 Equipment installation site
4.1.1 The design of the cryogenic liquid vaporization station shall comply with the provisions of GB50030. 4.1.2 The placement and use of cryogenic liquid storage containers that are pressure vessels shall comply with the provisions of this standard and the relevant provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels", "Regulations on Inspection of In-use Pressure Vessels" and "Regulations on Registration and Management of Pressure Vessel Use". 4.1.3 The installation site must have good ventilation conditions or be equipped with ventilation devices, and be able to safely discharge liquids and gases. 4.1.4 The installation site must have a safe exit, and safety signs should be set up around it. The requirements for safety signs should comply with the relevant provisions of GB2894. Approved by the Ministry of Machinery Industry on March 4, 1997
Implemented on October 1, 1997
JB6898-1997
4.1.5 The foundation for installing the container must be solid and firm, and should be fireproof and heat-resistant: The foundation for installing liquid oxygen equipment must be free of grease and other combustibles. It is strictly forbidden to use asphalt ground.
4.1.6 There must be sufficient water sources near the installation site, and the site must have fire-fighting equipment. There must be no flammable and explosive materials within 5m around the site, and the site must be kept clean.
4.1.7 The installation site should have access passages for tank trucks or fire trucks, and be wide enough to facilitate the passage of tank trucks or fire trucks. 4.1.8 The partition walls and roof buildings in the places where liquid oxygen containers are installed shall not be lower than the secondary fire protection and heat resistance requirements in GBJ16, and the lightning protection requirements of the buildings shall comply with the provisions of GB50057. 4.1.9 The places where liquid oxygen is stored, vaporized, filled and used should be equipped with walls or fences: the safety exits must be properly arranged, and generally there should be entrances and exits on both sides, so that people can evacuate quickly in the event of danger: one entrance and exit is allowed in the place where the vaporizer is installed. Doors and windows must open outwards.
4.1.10 The installation distance between liquid oxygen containers should not be less than the radius of the larger container of the two adjacent containers, and the minimum distance should not be less than 1m. 4.1.11 The fire protection distance between liquid oxygen containers and other buildings, storage tanks and yards must comply with the relevant provisions of GBJ16. When the fire separation distance cannot be achieved, a fire partition wall 0.5m higher than the container and fireproof material should be built, which can reduce the fire separation distance to 1/2 of the above provisions. 4.1.12 Open flames are strictly prohibited within 5m around the storage, vaporization, filling and use of liquid oxygen. All fire sources are eliminated and there should be obvious fire ban signs.
4.1.13 There shall be no openings leading to lower places (such as basements, pits, underground wells, ditches) within at least 5m around the storage, vaporization, filling and use of liquid oxygen: there must be a liquid weir at the entrance of the ditch. 4.2 Equipment placement
4.2.1 Containers shall not be placed at entrances and exits, passages, stairwells or close to them. 4.2.2 Liquid oxygen containers should generally be placed outdoors. When the total storage volume of liquid oxygen does not exceed 10m, it is allowed to be placed indoors in a fireproof and heat-resistant non-combustible material building with a fire resistance limit of not less than 1.5h, and must have good ventilation conditions and a separate room with less personnel flow: the distance between open flames is not less than 5m.
4.2.3 Liquid nitrogen and liquid argon containers should be placed outdoors. If placed indoors, the installation site should comply with the provisions of 4.1.3, and the gas emergency vent must be led to a safe place outdoors. The height of the vent from the ground shall not be less than 2m. 4.2.4 Liquid oxygen containers shall not be placed on the upper and lower floors of rooms where people often stay. 4.2.5 Liquid oxygen containers are placed outdoors and must be equipped with grounding devices and lightning protection devices to remove static electricity. The grounding resistance to prevent static electricity should not be greater than 10Q: the maximum impact resistance of the lightning protection device is 30Q. 4.3 Tank truck transportation and filling
4.3.1 The use, transportation and maintenance of tank trucks must comply with the relevant provisions of the "Regulations on Safety Supervision of Liquefied Gas Tank Trucks": The use, management and maintenance of tank truck containers must comply with the relevant provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels". 4.3.2 Tank trucks loaded with cryogenic liquids should be driven at a limited speed, and the driving speed is generally: the maximum speed on first-class highways is 60km/h: the second and third-class highways are 30~50km/h: it is advisable to drive at a low speed on highways, and emergency braking should be avoided to prevent collisions. 4.3.3 Tank trucks should avoid downtown areas and densely populated areas. When they must pass, they should drive at a limited speed and must not stop at will. 4.3.4 When tank trucks transport liquids, the readings of the pressure gauge should be monitored frequently, and it is strictly forbidden to exceed the specified pressure value. When the pressure gauge readings are abnormally high, the tank truck should be driven to a sparsely populated and open area, open the vent valve, and exhaust the gas to relieve pressure. When discharging oxygen, open flames are strictly prohibited in the affected area. 4.3.5 Liquid oxygen tank trucks must have static-conducting grounding devices. 4.3.6 Tank trucks may enter the filling site for filling only after obtaining the consent of relevant personnel: During filling, operators must be on site and filling operations should be carried out in accordance with operating procedures to prevent low-temperature liquids from spilling. When filling liquid oxygen, there must be no open flames within 5m. 2
JB6898-1997
4.3.7 Before connecting the filling and infusion pipe, the tank truck must be in a braked state to prevent movement: anti-sliding blocks should be installed on slopes. 4.3.8 The tank truck should leave in time after filling. If the filling work is interrupted for too long (overnight or on holidays), the infusion pipe connection should be released. 4.3.9 The tank truck engine must be turned off during filling and loading and unloading operations. 4.4.4.1 The filling rate of containers and tank truck containers shall not be greater than 0.95, and overfilling is strictly prohibited. 4.4.2 Before the container is put into use, various valves, instruments, and safety devices should be checked in accordance with the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" to ensure safe use. The pressure gauge used must be an oil-free pressure gauge: the material of the safety valve and explosion-proof device should be stainless steel, copper or aluminum, and must be degreased and deoiled. 4.4.3 Before using the container, vaporizer and piping system, water or moisture should be blown off with oil-free dry air or nitrogen. 4.4.4 The gas outlet temperature of the cryogenic liquid vaporizer shall not be lower than -20℃. 4.4.5 When the container is filled for the first time, it should be filled slowly at the beginning (the valve should be opened slowly), and then gradually accelerated to reduce thermal shock damage to the container and reduce liquid evaporation.
4.4.6 When the valves, instruments, pipe joints, etc. on the equipment are frozen, it is strictly forbidden to hit them with a hammer or heat them with an open flame. It is advisable to use clean, oil-free hot air, hot nitrogen or warm water at 70~80℃ to melt and thaw. 4.4.7 The equipment must be dedicated to the medium indicated on the nameplate: when it is necessary to change the permitted medium, it must be thoroughly cleaned and blown away, and tested and analyzed to be qualified to be suitable for filling with another medium, and the corresponding color code must be changed. 4.4.8 The liquid oxygen in the liquid oxygen container and liquid oxygen tank truck should be analyzed for acetylene content regularly, at least once a month, and its acetylene content shall not exceed 0.1×10~°, otherwise the liquid oxygen should be discharged. The method for determining the acetylene content is to use the "colorimetric method" chemical analysis or chromatography for determination. 4.4.9 The user unit must formulate safe use and operation procedures. Before the operator takes up the job independently, he must receive safety education and training, pass the assessment, and hold a safety operation certificate to take up the job. 4.4.10 Operators should be familiar with the relevant provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" and the characteristics and hazards of cryogenic liquids. 4.4.11 Operators should be familiar with the product manual, equipment process flow, various valves, instruments on the equipment and their functions and operating procedures: they must be able to take emergency safety measures independently in the event of failures and accidents. 4.4.12 Other troubleshooting on containers and tank trucks should be handled in accordance with the relevant provisions of the manual. 4.5 Equipment Maintenance
4.5.1 Containers and tank truck containers, as well as pressure gauges, liquid level indicators, and safety devices should be regularly inspected and calibrated in accordance with the "Regulations on Safety Technical Supervision of Pressure Vessels", "Regulations on Inspection of In-use Pressure Vessels" and "Regulations on Safety Supervision of Liquefied Gas Tank Trucks". 4.5.2 The lightning protection and electrostatic grounding devices on liquid oxygen containers should be regularly tested for grounding resistance, at least once a year. 4.5.3 When liquid oxygen tank trucks are storing liquid oxygen, fire repairs are not allowed. 4.5.4 When there is large-scale frost, condensation or abnormally large daily evaporation on the outer shell of the container and tank truck container, timely maintenance should be carried out. Major equipment repairs should be carried out at the product manufacturer or professional repair unit. 4.5.5 Before repairing the equipment, it must be blown and replaced with oil-free dry air, and the equipment temperature must be raised to normal temperature: the provisions of the fire system must be strictly followed when starting a fire.
4.5.6 When discharging liquid or gas before equipment maintenance, the discharge should be discharged into a well-ventilated atmosphere or a dedicated discharge area, and must be supervised by a dedicated person: the discharge area should be equipped with obvious signs and warning signs to ensure discharge safety. When discharging liquid oxygen, open flames are strictly prohibited in the affected area. 4.5.7 Valves and instruments on the equipment should be repaired by professionals: Valves and instruments used for oxygen should be strictly degreased and deoiled after repair, and flushed with oil-free dry air or nitrogen.
4.6 Safety protection
JB6898-1997
4.6.1 When filling or handling cryogenic liquids, operators should wear clean and easy-to-remove leather, cloth or cotton gloves. If there is a possibility of liquid spraying or splashing, goggles or masks should be worn. When handling a large amount of cryogenic liquid or a serious leak of cryogenic liquid, unstudded leather boots should be worn, and the trouser legs should be put on the outside of the leather boots.
4.6.2 When filling or handling liquid oxygen, operators must not wear work clothes and personal protective equipment that are stained with grease. All clothes and protective equipment that are stained with grease must be replaced: chemical fiber clothing with static electricity effect must not be worn: spiked shoes must not be worn. If the operator's clothes have been permeated with oxygen, they must not enter places with open flames. If necessary, clothes must be changed or fully blown out in the atmosphere for at least 15 minutes.
4.6.3 When handling liquid nitrogen, liquid argon and their gases in poorly ventilated places with the risk of asphyxiation, the oxygen content of the atmosphere must be analyzed. When the oxygen content is lower than 18%, the operator must wear a self-contained protective mask and operate under the supervision of a special person. The oxygen content in the air can be determined by "chemical analysis". 4.6.4 When the operator's skin is frostbitten due to contact with cryogenic liquids or cryogenic gases, the injured part should be soaked or rinsed in warm water in time, and never dry heated. Severe frostbite should be treated in hospital quickly. 5 Accident Handling
5.1 When there is a slight leak in the tank truck container pipeline system, it should be repaired and handled in time: When there is a serious leak, the tank truck must be driven to a sparsely populated, open and safe place, and gradually discharged, and strict supervision should be carried out: When discharging, people and vehicles should be in the upwind direction. When discharging liquid oxygen, the car engine must be turned off: Open flames are strictly prohibited in the liquid oxygen affected area.
5.2 When a major accident occurs on the way, the relevant local authorities must be promptly reported for handling and emergency measures must be taken. 5.3 If a fire occurs near the container and the ambient temperature is likely to accelerate the vaporization of the liquid, cooling water can be sprayed onto the container shell to cool it down. 4
People's Republic of China
Mechanical Industry Standard
Safety Rules for the Use of Cryogenic Liquid Storage and Transportation Equipment JB6898-1997
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 1/2 Word Count 10,000
First Edition July 1997
First Printing July 1997
Print Quantity 1500
Price 5.00 Yuan
No. 97-094
Mechanical Industry Standard Service Network: http://www.JB.ac.cnL66-86894 When there is large-scale frost, condensation or abnormally large daily evaporation on the outer shell of the container and tank truck container, it should be repaired in time. Major equipment repairs should be carried out at the product manufacturer or professional repair unit. 4.5.5 Before repairing the equipment, it must be blown and replaced with oil-free dry air, and the equipment temperature must be raised to normal temperature: the provisions of the fire system must be strictly followed when starting a fire.
4.5.6 When discharging liquid or gas before equipment maintenance, the discharge should be discharged into a well-ventilated atmosphere or a dedicated discharge area, and must be supervised by a dedicated person: the discharge area should be equipped with obvious signs and warning signs to ensure discharge safety. When discharging liquid oxygen, open flames are strictly prohibited in the affected area. 4.5.7 Valves and instruments on the equipment should be repaired by professionals: Valves and instruments used for oxygen should be strictly degreased and deoiled after repair, and flushed with oil-free dry air or nitrogen.
4.6 Safety protection
JB6898-1997
4.6.1 When filling or handling cryogenic liquids, operators should wear clean and easy-to-remove leather, cloth or cotton gloves. If there is a possibility of liquid spraying or splashing, goggles or masks should be worn. When handling a large amount of cryogenic liquid or a serious leak of cryogenic liquid, unstudded leather boots should be worn, and the trouser legs should be put on the outside of the leather boots.
4.6.2 When filling or handling liquid oxygen, operators must not wear work clothes and personal protective equipment that are stained with grease. All clothes and protective equipment that are stained with grease must be replaced: chemical fiber clothing with static electricity effect must not be worn: spiked shoes must not be worn. If the operator's clothes have been permeated with oxygen, they must not enter places with open flames. If necessary, clothes must be changed or fully blown out in the atmosphere for at least 15 minutes.
4.6.3 When handling liquid nitrogen, liquid argon and their gases in poorly ventilated places with the risk of asphyxiation, the oxygen content of the atmosphere must be analyzed. When the oxygen content is lower than 18%, the operator must wear a self-contained protective mask and operate under the supervision of a special person. The oxygen content in the air can be determined by "chemical analysis". 4.6.4 When the operator's skin is frostbitten due to contact with cryogenic liquids or cryogenic gases, the injured part should be soaked or rinsed in warm water in time, and never dry heated. Severe frostbite should be treated in hospital quickly. 5 Accident Handling
5.1 When there is a slight leak in the tank truck container pipeline system, it should be repaired and handled in time: When there is a serious leak, the tank truck must be driven to a sparsely populated, open and safe place, and gradually discharged, and strict supervision should be carried out: When discharging, people and vehicles should be in the upwind direction. When discharging liquid oxygen, the car engine must be turned off: Open flames are strictly prohibited in the liquid oxygen affected area.
5.2 When a major accident occurs on the way, the relevant local authorities must be promptly reported for handling and emergency measures must be taken. 5.3 If a fire occurs near the container and the ambient temperature is likely to accelerate the vaporization of the liquid, cooling water can be sprayed onto the container shell to cool it down. 4
People's Republic of China
Mechanical Industry Standard
Safety Rules for the Use of Cryogenic Liquid Storage and Transportation Equipment JB6898-1997
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 1/2 Word Count 10,000
First Edition July 1997
First Printing July 1997
Print Quantity 1500
Price 5.00 Yuan
No. 97-094
Mechanical Industry Standard Service Network: http://www.JB.ac.cnL66-86894 When there is large-scale frost, condensation or abnormally large daily evaporation on the outer shell of the container and tank truck container, it should be repaired in time. Major equipment repairs should be carried out at the product manufacturer or professional repair unit. 4.5.5 Before repairing the equipment, it must be blown and replaced with oil-free dry air, and the equipment temperature must be raised to normal temperature: the provisions of the fire system must be strictly followed when starting a fire.
4.5.6 When discharging liquid or gas before equipment maintenance, the discharge should be discharged into a well-ventilated atmosphere or a dedicated discharge area, and must be supervised by a dedicated person: the discharge area should be equipped with obvious signs and warning signs to ensure discharge safety. When discharging liquid oxygen, open flames are strictly prohibited in the affected area. 4.5.7 Valves and instruments on the equipment should be repaired by professionals: Valves and instruments used for oxygen should be strictly degreased and deoiled after repair, and flushed with oil-free dry air or nitrogen.
4.6 Safety protection
JB6898-1997
4.6.1 When filling or handling cryogenic liquids, operators should wear clean and easy-to-remove leather, cloth or cotton gloves. If there is a possibility of liquid spraying or splashing, goggles or masks should be worn. When handling a large amount of cryogenic liquid or a serious leak of cryogenic liquid, unstudded leather boots should be worn, and the trouser legs should be put on the outside of the leather boots.
4.6.2 When filling or handling liquid oxygen, operators must not wear work clothes and personal protective equipment that are stained with grease. All clothes and protective equipment that are stained with grease must be replaced: chemical fiber clothing with static electricity effect must not be worn: spiked shoes must not be worn. If the operator's clothes have been permeated with oxygen, they must not enter places with open flames. If necessary, clothes must be changed or fully blown out in the atmosphere for at least 15 minutes.
4.6.3 When handling liquid nitrogen, liquid argon and their gases in poorly ventilated places with the risk of asphyxiation, the oxygen content of the atmosphere must be analyzed. When the oxygen content is lower than 18%, the operator must wear a self-contained protective mask and operate under the supervision of a special person. The oxygen content in the air can be determined by "chemical analysis". 4.6.4 When the operator's skin is frostbitten due to contact with cryogenic liquids or cryogenic gases, the injured part should be soaked or rinsed in warm water in time, and never dry heated. Severe frostbite should be treated in hospital quickly. 5 Accident Handling
5.1 When there is a slight leak in the tank truck container pipeline system, it should be repaired and handled in time: When there is a serious leak, the tank truck must be driven to a sparsely populated, open and safe place, and gradually discharged, and strict supervision should be carried out: When discharging, people and vehicles should be in the upwind direction. When discharging liquid oxygen, the car engine must be turned off: Open flames are strictly prohibited in the liquid oxygen affected area.
5.2 When a major accident occurs on the way, the relevant local authorities must be promptly reported for handling and emergency measures must be taken. 5.3 If a fire occurs near the container and the ambient temperature is likely to accelerate the vaporization of the liquid, cooling water can be sprayed onto the container shell to cool it down. 4
People's Republic of China
Mechanical Industry Standard
Safety Rules for the Use of Cryogenic Liquid Storage and Transportation Equipment JB6898-1997
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 1/2 Word Count 10,000
First Edition July 1997
First Printing July 1997
Print Quantity 1500
Price 5.00 Yuan
No. 97-094
Mechanical Industry Standard Service Network: http://www.JB.ac.cnL66-8689
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.