GB 13004-1999 Periodic inspection and evaluation of seamless steel gas cylinders
Some standard content:
GB13004—1999
Compared with the previous version, this standard mainly modifies and supplements the evaluation data of the outer surface defects of the cylinder body. This standard replaces GB13004—91 from the date of implementation. Appendix A of this standard is the standard appendix.
Appendix B of this standard is the reminder appendix.
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is technically managed by the National Technical Committee for Standardization of Gas Cylinders. Drafting units of this standard: Dalian Boiler and Pressure Vessel Inspection Institute, Xuzhou Gas Plant, Zhuzhou Cemented Carbide Plant, Dalian Jinju Chemical The main drafters of this standard: Hu Jun, Sun Pinghui, Ding Peiyin, Wen Shude, Chen Liping. This standard was first issued in April 1991.
National Standard of the People's Republic of China
Periodic inspection and evaluation of seamless steel gas cylinders
Periodic inspection and evaluation of seamless steel gas cylinders1 Scope
This standard specifies the basic methods and technical requirements for the periodic inspection and evaluation of seamless steel gas cylinders in use. GB13004-1999
Replaces GB13004-91
This standard applies to the periodic inspection and evaluation of seamless steel gas cylinders for storage and transportation of permanent gas or high-pressure liquefied gas and refillable steel gas cylinders (hereinafter referred to as gas cylinders) with a water pressure test pressure not exceeding 45MPa and a water volume of 0.4 to 80L, and natural gas cylinders for vehicles (hereinafter referred to as gas cylinders).
This standard does not apply to gas cylinders filled with solid fillings and gas cylinders for fire extinguishing. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB5099—1994 Seamless steel gas cylinders
GB7144-1986 Color marking of gas cylinders
GB8335—1998 Special threads for gas cylinders
GB/T8336—1998 Special thread gauges for gas cylindersGB/T10878—1989 Taper threads for gas cylindersGB/T12137—1989 Gas cylinder air tightness test methodGB/T9251—1997
Gas cylinder water pressure test method
GB/T13005---1991 Gas cylinder terminology
IL.D96:1996 Gas cylinder modification procedure
3 Inspection cycle and inspection items
3.1 Gas cylinders containing inert gases shall be inspected every five years; gas cylinders containing corrosive gases, diving gas cylinders and gas cylinders that are often in contact with seawater shall be inspected every two years; gas cylinders containing other gases shall be inspected every three years. If the gas cylinder is found to be severely corroded or damaged during use or there is doubt about its safety and reliability, it should be inspected in advance. Gas cylinders that have been in storage or out of use for more than one inspection cycle should be inspected before they are put into use. 3.2 The regular inspection items of gas cylinders include appearance inspection, sound inspection, internal inspection, bottle mouth thread inspection, weight and volume measurement, water pressure test, bottle valve inspection and air tightness test.
4 Inspection preparation
4.1 Check the manufacturing mark and inspection mark of each registered gas cylinder. The registration content includes country, manufacturer name code, factory number, year and month of production, nominal working pressure, water pressure test pressure, actual volume, actual weight, and last inspection date. 4.1.1 Cylinders manufactured by manufacturers not approved by the labor department, cylinders whose manufacturing marks do not comply with GB5099 or the "Regulations on Safety Supervision of Gas Cylinders" approved by the State Administration of Quality and Technical Supervision on February 11, 1999 288
1999-11-01 implementation
GB13004--1999
, cylinders with unclear manufacturing marks or incomplete key items and no traceable evidence, and cylinders that are prohibited from being used according to relevant government documents, will not be inspected and scrapped after registration.
4.1.2 Cylinders with a service life of more than 30 years will be scrapped and will not be inspected after registration. 4.1.3 For cylinders to be modified, whether they can be modified shall be determined according to LD96. Those that are not suitable for modification should be returned; those that are suitable for modification should be marked and stored in designated places.
4.2 For gas cylinders with unknown media and valves that cannot be opened, they should be stored separately from the cylinders to be inspected for proper treatment. 4.3 After confirming the media in the cylinder, according to the different properties of the media, the gas should be discharged by a method suitable for the media in the cylinder under the conditions of ensuring safety, hygiene and non-polluting the environment. For gas cylinders containing toxic gases, effective measures must be taken to detoxify the cylinder after discharging the gas in the cylinder.
4.4 When it is confirmed that the pressure in the cylinder is consistent with the atmospheric pressure, remove the cylinder valve and shockproof ring with a cylinder valve loading and unloading machine and a shockproof ring loading and unloading machine that does not damage the metal of the cylinder wall.
4.5 Use appropriate methods that do not damage the metal of the cylinder body to clean the dirt, corrosion products, contaminants and other debris that hinder surface inspection on the inner and outer surfaces of the gas cylinder, as well as the loose paint film on the outer surface. 5 Appearance inspection and assessment
5.1 Appearance inspection of cylinders
The cylinders should be visually inspected one by one to check whether there are defects such as dents, pits, bulges, knocks, scratches, cracks, interlayers, wrinkles, corrosion, thermal damage, etc. on their outer surfaces.
5.1.1 Cylinders with defects such as cracks, bulges, scars, wrinkles or inclusions on the cylinder body should be scrapped. 5.1.2 Cylinders with residual wall thickness less than 90% of the designed wall thickness at the knocks, scratches and pits on the cylinder body should be scrapped [see Appendix B (Suggestive Appendix) for measurement methods].
For defects that do not meet the scrapping conditions, especially linear defects or sharp mechanical damage, grinding should be carried out to make the edges smooth, but the wall thickness after grinding should be greater than 90% of the designed wall thickness. This provision also applies to Article 5.1.7. If the inspected gas cylinder is a gas cylinder manufactured or imported before the implementation of GB5099--1985, its remaining wall thickness shall not be less than the specified value determined by the design and manufacturing regulations or relevant standards of the cylinder. This provision also applies to Articles 5.1.7, 9.3, and 10.4. 5.1.3 Gas cylinders with a dent depth exceeding 2mm or greater than 1/30 of the short diameter of the dent shall be scrapped (see Appendix B for measurement methods). 5.1.4 When the dent in the bottle body contains scratches or knocks, if the depth of the defect is equal to or greater than the provisions of Article 5.1.2 or Article 5.1.3; or if the depth of the defect is less than the provisions of Article 5.1.2 or Article 5.1.3, but the length of the knock or scratch is equal to or greater than the short diameter of the dent, and the depth of the dent exceeds 1.5mm or the depth of the dent is greater than 1/35 of the short diameter of the dent, then the gas cylinder shall be scrapped. 5.1.5 Gas cylinders with arc scars, welding marks, or heat damage such as open flames that damage the metal shall be scrapped. 5.1.6 Gas cylinders with isolated point corrosion on the cylinder body whose remaining wall thickness is less than 2/3 of the designed wall thickness should be scrapped. 5.1.7 Gas cylinders with line corrosion or surface corrosion on the cylinder body whose remaining wall thickness is less than 90% of the designed wall thickness should be scrapped. 5.1.8 Gas cylinders with loose neck rings that cannot be reinforced, or damaged neck rings that cannot be replaced should be scrapped. 5.1.9 Gas cylinders with loose, tilted, cracked, worn bases or with a distance of less than 10mm between their supporting surface and the lowest point of the bottom of the cylinder should be scrapped. 5.1.10 Gas cylinders with any of the following conditions should be scrapped: a) The roundness of the cylinder exceeds 2.0%;
b) The allowable deviation of the straightness of the cylinder exceeds 4% of the length of the cylinder body, and the bending depth is greater than 5mm; c) The allowable deviation of the verticality of the cylinder exceeds 8% of the length of the cylinder body. 6 Sound Inspection
6.1 Gas cylinders that have passed the appearance inspection should be subjected to sound inspection one by one. 6.2 When there are no attachments or other obstacles to the vibration of the cylinder, use a wooden hammer or a small copper hammer weighing about 250g to tap the cylinder wall. If the sound is clear and powerful, and the after-sound is light, long and melodic, the test is qualified. 289
GB 13004 -1999
6.3 Cylinders with very turbid and low sound, heavy and short after-sound and accompanied by shell cracking sound should be scrapped. 7 Bottle thread inspection
7.1 Use visual inspection or a low-power magnifying glass to check whether the threads are cracked, deformed, corroded or otherwise mechanically damaged. 7.2 The bottle thread shall not have crack defects, but slight damage that does not affect the use of the bottle thread is allowed. For high-pressure gas cylinders, no more than 2 teeth are allowed; for low-pressure gas cylinders, no more than 3 teeth are allowed, and the length of the gap shall not exceed 1/6 of the circumference, and the depth of the gap shall not exceed 1/3 of the tooth height.
7.3 Mild corrosion, wear or other damage to the bottle thread can be repaired with a tap that complies with the provisions of GB/T10878. After repair, it can be inspected with a gauge that complies with GB/T8336. If the inspection result fails, the gas cylinder should be scrapped. 8 Internal inspection
8.1 Use an endoscope or a safety light with a voltage not exceeding 24V and sufficient brightness to inspect the internal parts of each gas cylinder. 8.2 For gas cylinders containing oxidizing media, pay special attention to check whether the bottle is contaminated by grease. If grease contamination is found, it must be degreased.
8.3 Gas cylinders with cracks, scars, wrinkles, interlayers or pits on the inner surface should be scrapped. 8.4 When there are corrosion defects on the inner surface, refer to 5.1.6 and 5.1.7 for assessment. 9 Weight and volume measurement
9.1 The weight and volume of gas cylinders must be measured one by one. 9.2 The scales used for weight and volume measurement should be accurate, and their maximum weighing value should be 1.5~3.0 times the commonly used weighing value. The calibration cycle of the scale shall not exceed three months.
9.3 When the difference between the current weight of the gas cylinder and the manufacturing mark weight is greater than 5%, the minimum wall thickness of the cylinder wall should be measured. In addition to pitting corrosion, gas cylinders with a minimum wall thickness less than 90% of the designed wall thickness should be scrapped.
9.4 For gas cylinders that pass the weight measurement, the current volume is determined by the method specified in Appendix A (Appendix to the standard). 9.5 For gas cylinders containing high-pressure or low-pressure liquefied gas whose current volume value is less than the volume value marked on the manufacturing mark, the original volume value marked on the manufacturing mark must be changed to the current volume value according to the volume measurement record. Gas cylinders whose current volume value is greater than 10% of the volume value marked on the manufacturing mark shall be scrapped. 10 Water pressure test
10.1 Gas cylinders must be subjected to water pressure test one by one. The water pressure test equipment, methods and safety measures shall comply with the requirements of GB/T9251. 10.2 The pressure holding time of gas cylinders under the test pressure: the test pressure is equal to or greater than 12MPa for high-pressure seamless gas cylinders for not less than 2min; the test pressure is equal to or less than 7.5MPa for low-pressure seamless gas cylinders for not less than 3min. 10.3 During the water pressure test, gas cylinders with leakage, obvious deformation or pressure drop during the pressure holding period (not due to leakage of the test equipment or bottle mouth) shall be scrapped.
10.4 During the water pressure test of high-pressure gas cylinders, the volume residual deformation rate shall be measured at the same time. When the volume residual deformation rate exceeds 6%, the minimum wall thickness of the bottle body should be measured, and its minimum wall thickness shall not be less than 90% of the designed wall thickness. Gas cylinders with a volume residual deformation rate exceeding 10% should be scrapped. 10.5 During the hydrostatic test of high-pressure gas cylinders, when the pressure rises to 90% or more of the test pressure, if the test cannot be continued for some reason, the test cylinders with invalid tests should be tested again by increasing the test pressure in accordance with the provisions of GB/T9251. 11 Internal Drying
11.1 Gas cylinders that have passed the hydrostatic test must be dried internally one by one. For gas cylinders with special requirements for the dew point of the contained medium, the filling unit should carry out special drying of the gas cylinders based on the specific requirements of the filled medium for the dew point on the basis of general drying at the inspection station. 11.2 After the gas cylinder passes the hydrostatic test, turn the bottle mouth upside down for a period of time, wait for the residual water in the bottle to drain, and use the internal heating or external heating hall method to carry out internal general drying.
GB13004--1999
11.3 The general drying temperature inside is usually controlled at 70-80℃; the drying time shall not be less than 20min11.4 After removing the gas cylinder from the drying device, use an endoscope or a small light bulb to observe the drying condition inside the bottle. If the inner wall is completely dry, the bottle valve can be installed.
12 Bottle valve inspection and assembly
12.1 The bottle valve should be disassembled for inspection, cleaned and damaged parts replaced one by one to ensure free opening and closing and no leakage. 12.2 The valve body and other parts shall not be seriously deformed, and the threads shall not be seriously damaged. The requirements can be referred to the provisions of Chapter 7. 12.3 When replacing the bottle valve or sealing material, the appropriate bottle valve or material must be selected according to the nature of the medium contained. Before assembling the bottle valve, the bottle valve must be tested for air tightness.
12.4 The cylinder valve should be firmly assembled and the effective number of threads and sealing performance of the connection with the bottle mouth should be guaranteed. The number of exposed threads shall not be less than 1 to 2 threads.
13 Air tightness test
13.1 After the gas cylinder passes the water pressure test, it must be tested for air tightness one by one. The test device and method shall comply with the requirements of GB/T12137, and the test pressure shall be equal to the nominal working pressure of the gas cylinder. 13.2 Gas cylinders containing flammable or toxic gases and gas cylinders containing high-purity or mixed gases shall be tested for air tightness by immersion. The water immersion pressure maintenance time of the gas cylinder shall not be less than 2 minutes, and there shall be no leakage or pressure drop during the pressure maintenance period. Gas cylinders containing other gases can be tested for air tightness by the liquid coating method at the end of the first filling after regular inspection. The liquid pressure maintenance time of the gas cylinder shall not be less than 1 minute, and bubbles are not allowed to escape continuously. 13.3 During the gas cylinder air tightness test, the gas cylinder that leaks under the test pressure should be scrapped. 13.4 If the test device or bottle valve leaks during the test, the test should be stopped immediately and the test should be carried out again after repair or reassembly. 14 Work after inspection
14.1 Gas cylinders that pass the regular inspection should be marked or stamped with inspection marks and sprayed with inspection color codes in accordance with the provisions of Appendix 1 of the "Regulations on Safety Supervision of Gas Cylinders".
14.2 The inspection personnel must fill in the inspection and assessment results of the gas cylinders in the "Record of Regular Inspection and Assessment of Gas Cylinders". 14.3 The inspection unit is responsible for destroying the scrapped gas cylinders. The destruction method is flattening or sawing, and filling in the "Notice of Scrapping of Gas Cylinders" in accordance with the provisions of Appendix 4 of the "Regulations on Safety Supervision of Gas Cylinders" to notify the gas cylinder property unit. Scraped gas cylinders can be used at reduced pressure or converted to other gases in accordance with the provisions of LD96. Gas cylinders that are not suitable for use at reduced pressure or conversion shall be scrapped. 14.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.5 For gas cylinders containing high-pressure or low-pressure liquefied gas whose current volume value is less than the volume value marked on the manufacturing mark, the original volume value marked on the manufacturing mark must be changed to the current volume value according to the volume measurement record. Gas cylinders whose current volume value is greater than 10% of the volume value marked on the manufacturing mark shall be scrapped. 10 Water pressure test
10.1 Gas cylinders must be subjected to water pressure test one by one. The water pressure test equipment, methods and safety measures shall comply with the requirements of GB/T9251. 10.2 Pressure holding time of gas cylinders under test pressure: not less than 2 minutes for high-pressure seamless gas cylinders with test pressure equal to or greater than 12MPa; not less than 3 minutes for low-pressure seamless gas cylinders with test pressure equal to or less than 7.5MPa. 10.3 During the water pressure test, gas cylinders with leakage, obvious deformation or pressure drop during the pressure holding period (not due to leakage of the test equipment or bottle mouth) shall be scrapped.
10.4 During the water pressure test of high-pressure gas cylinders, the volume residual deformation rate shall be measured at the same time. When the volume residual deformation rate exceeds 6%, the minimum wall thickness of the bottle body should be measured, and its minimum wall thickness shall not be less than 90% of the designed wall thickness. Gas cylinders with a volume residual deformation rate exceeding 10% should be scrapped. 10.5 During the hydrostatic test of high-pressure gas cylinders, when the pressure rises to 90% or more of the test pressure, if the test cannot be continued for some reason, the test cylinders with invalid tests should be tested again by increasing the test pressure in accordance with the provisions of GB/T9251. 11 Internal Drying
11.1 Gas cylinders that have passed the hydrostatic test must be dried internally one by one. For gas cylinders with special requirements for the dew point of the contained medium, the filling unit should carry out special drying of the gas cylinders based on the specific requirements of the filled medium for the dew point on the basis of general drying at the inspection station. 11.2 After the gas cylinder passes the hydrostatic test, turn the bottle mouth upside down for a period of time, wait for the residual water in the bottle to drain, and use the internal heating or external heating hall method to carry out internal general drying.
GB13004--1999
11.3 The general drying temperature inside is usually controlled at 70-80℃; the drying time shall not be less than 20min11.4 After removing the gas cylinder from the drying device, use an endoscope or a small light bulb to observe the drying condition inside the bottle. If the inner wall is completely dry, the bottle valve can be installed.
12 Bottle valve inspection and assembly
12.1 The bottle valve should be disassembled for inspection, cleaned and damaged parts replaced one by one to ensure free opening and closing and no leakage. 12.2 The valve body and other parts shall not be seriously deformed, and the threads shall not be seriously damaged. The requirements can be referred to the provisions of Chapter 7. 12.3 When replacing the bottle valve or sealing material, the appropriate bottle valve or material must be selected according to the nature of the medium contained. Before assembling the bottle valve, the bottle valve must be tested for air tightness.
12.4 The cylinder valve should be firmly assembled and the effective number of threads and sealing performance of the connection with the bottle mouth should be guaranteed. The number of exposed threads shall not be less than 1 to 2 threads.
13 Air tightness test
13.1 After the gas cylinder passes the water pressure test, it must be tested for air tightness one by one. The test device and method shall comply with the requirements of GB/T12137, and the test pressure shall be equal to the nominal working pressure of the gas cylinder. 13.2 Gas cylinders containing flammable or toxic gases and gas cylinders containing high-purity or mixed gases shall be tested for air tightness by immersion. The water immersion pressure maintenance time of the gas cylinder shall not be less than 2 minutes, and there shall be no leakage or pressure drop during the pressure maintenance period. Gas cylinders containing other gases can be tested for air tightness by the liquid coating method at the end of the first filling after regular inspection. The liquid pressure maintenance time of the gas cylinder shall not be less than 1 minute, and bubbles are not allowed to escape continuously. 13.3 During the gas cylinder air tightness test, the gas cylinder that leaks under the test pressure should be scrapped. 13.4 If the test device or bottle valve leaks during the test, the test should be stopped immediately and the test should be carried out again after repair or reassembly. 14 Work after inspection
14.1 Gas cylinders that pass the regular inspection should be marked or stamped with inspection marks and sprayed with inspection color codes in accordance with the provisions of Appendix 1 of the "Regulations on Safety Supervision of Gas Cylinders".
14.2 The inspection personnel must fill in the inspection and assessment results of the gas cylinders in the "Record of Regular Inspection and Assessment of Gas Cylinders". 14.3 The inspection unit is responsible for destroying the scrapped gas cylinders. The destruction method is flattening or sawing, and filling in the "Notice of Scrapping of Gas Cylinders" in accordance with the provisions of Appendix 4 of the "Regulations on Safety Supervision of Gas Cylinders" to notify the gas cylinder property unit. Scraped gas cylinders can be used at reduced pressure or converted to other gases in accordance with the provisions of LD96. Gas cylinders that are not suitable for use at reduced pressure or conversion shall be scrapped. 14.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, LwwW.bzxz.Net
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate matches the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.5 For gas cylinders containing high-pressure or low-pressure liquefied gas whose current volume value is less than the volume value marked on the manufacturing mark, the original volume value marked on the manufacturing mark must be changed to the current volume value according to the volume measurement record. Gas cylinders whose current volume value is greater than 10% of the volume value marked on the manufacturing mark shall be scrapped. 10 Water pressure test
10.1 Gas cylinders must be subjected to water pressure test one by one. The water pressure test equipment, methods and safety measures shall comply with the requirements of GB/T9251. 10.2 Pressure holding time of gas cylinders under test pressure: not less than 2 minutes for high-pressure seamless gas cylinders with test pressure equal to or greater than 12MPa; not less than 3 minutes for low-pressure seamless gas cylinders with test pressure equal to or less than 7.5MPa. 10.3 During the water pressure test, gas cylinders with leakage, obvious deformation or pressure drop during the pressure holding period (not due to leakage of the test equipment or bottle mouth) shall be scrapped.
10.4 During the water pressure test of high-pressure gas cylinders, the volume residual deformation rate shall be measured at the same time. When the volume residual deformation rate exceeds 6%, the minimum wall thickness of the bottle body should be measured, and its minimum wall thickness shall not be less than 90% of the designed wall thickness. Gas cylinders with a volume residual deformation rate exceeding 10% should be scrapped. 10.5 During the hydrostatic test of high-pressure gas cylinders, when the pressure rises to 90% or more of the test pressure, if the test cannot be continued for some reason, the test cylinders with invalid tests should be tested again by increasing the test pressure in accordance with the provisions of GB/T9251. 11 Internal Drying
11.1 Gas cylinders that have passed the hydrostatic test must be dried internally one by one. For gas cylinders with special requirements for the dew point of the contained medium, the filling unit should carry out special drying of the gas cylinders based on the specific requirements of the filled medium for the dew point on the basis of general drying at the inspection station. 11.2 After the gas cylinder passes the hydrostatic test, turn the bottle mouth upside down for a period of time, wait for the residual water in the bottle to drain, and use the internal heating or external heating hall method to carry out internal general drying.
GB13004--1999
11.3 The general drying temperature inside is usually controlled at 70-80℃; the drying time shall not be less than 20min11.4 After removing the gas cylinder from the drying device, use an endoscope or a small light bulb to observe the drying condition inside the bottle. If the inner wall is completely dry, the bottle valve can be installed.
12 Bottle valve inspection and assembly
12.1 The bottle valve should be disassembled for inspection, cleaned and damaged parts replaced one by one to ensure free opening and closing and no leakage. 12.2 The valve body and other parts shall not be seriously deformed, and the threads shall not be seriously damaged. The requirements can be referred to the provisions of Chapter 7. 12.3 When replacing the bottle valve or sealing material, the appropriate bottle valve or material must be selected according to the nature of the medium contained. Before assembling the bottle valve, the bottle valve must be tested for air tightness.
12.4 The cylinder valve should be firmly assembled and the effective number of threads and sealing performance of the connection with the bottle mouth should be guaranteed. The number of exposed threads shall not be less than 1 to 2 threads.
13 Air tightness test
13.1 After the gas cylinder passes the water pressure test, it must be tested for air tightness one by one. The test device and method shall comply with the requirements of GB/T12137, and the test pressure shall be equal to the nominal working pressure of the gas cylinder. 13.2 Gas cylinders containing flammable or toxic gases and gas cylinders containing high-purity or mixed gases shall be tested for air tightness by immersion. The water immersion pressure maintenance time of the gas cylinder shall not be less than 2 minutes, and there shall be no leakage or pressure drop during the pressure maintenance period. Gas cylinders containing other gases can be tested for air tightness by the liquid coating method at the end of the first filling after regular inspection. The liquid pressure maintenance time of the gas cylinder shall not be less than 1 minute, and bubbles are not allowed to escape continuously. 13.3 During the gas cylinder air tightness test, the gas cylinder that leaks under the test pressure should be scrapped. 13.4 If the test device or bottle valve leaks during the test, the test should be stopped immediately and the test should be carried out again after repair or reassembly. 14 Work after inspection
14.1 Gas cylinders that pass the regular inspection should be marked or stamped with inspection marks and sprayed with inspection color codes in accordance with the provisions of Appendix 1 of the "Regulations on Safety Supervision of Gas Cylinders".
14.2 The inspection personnel must fill in the inspection and assessment results of the gas cylinders in the "Record of Regular Inspection and Assessment of Gas Cylinders". 14.3 The inspection unit is responsible for destroying the scrapped gas cylinders. The destruction method is flattening or sawing, and filling in the "Notice of Scrapping of Gas Cylinders" in accordance with the provisions of Appendix 4 of the "Regulations on Safety Supervision of Gas Cylinders" to notify the gas cylinder property unit. Scraped gas cylinders can be used at reduced pressure or converted to other gases in accordance with the provisions of LD96. Gas cylinders that are not suitable for use at reduced pressure or conversion shall be scrapped. 14.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.2 After the cylinder has passed the hydraulic pressure test, turn the bottle mouth downward for a period of time, wait for the residual water in the bottle to drain, and use the internal heating or external heating method to dry the inside.
GB13004--1999
11.3 The temperature of internal general drying is usually controlled at 70-80℃; the drying time shall not be less than 20min11.4 After removing the cylinder from the drying device, observe the drying condition inside the bottle with the help of an endoscope or a small light bulb. If the inner wall is completely dry, the bottle valve can be installed.
12 Bottle valve inspection and assembly
12.1 The bottle valve should be disassembled, inspected, cleaned and damaged parts replaced one by one to ensure free opening and closing and no leakage. 12.2 The valve body and other parts shall not be seriously deformed, and the threads shall not be seriously damaged. The requirements can be referred to the provisions of Chapter 7. 12.3 When replacing the bottle valve or sealing material, the appropriate bottle valve or material must be selected according to the nature of the medium contained. Before assembling the cylinder valve, the cylinder valve must be tested for air tightness.
12.4 The cylinder valve should be firmly assembled and the effective number of threads and sealing performance of its connection with the bottle mouth should be guaranteed. The number of exposed threads shall not be less than 1 to 2 threads.
13 Air tightness test
13.1 After the cylinder water pressure test is qualified, the air tightness test must be carried out one by one. The test device and method shall comply with the requirements of GB/T12137, and the test pressure shall be equal to the nominal working pressure of the cylinder. 13.2 The cylinders containing flammable or toxic gases and cylinders containing high-purity or mixed gases shall be tested for air tightness by immersion method. The cylinder shall be immersed in water for a pressure-maintaining time of not less than 2 minutes, and there shall be no leakage or pressure drop during the pressure-maintaining period. Cylinders containing other gases can be tested for air tightness by liquid coating method at the end of the first filling after regular inspection. The cylinder shall be kept under pressure with liquid for not less than 1 minute, and bubbles are not allowed to escape continuously. 13.3 During the gas cylinder air tightness test, the gas cylinder that leaks under the test pressure should be scrapped. 13.4 If the test device or bottle valve leaks during the test, the test should be stopped immediately and the test should be carried out again after repair or reassembly. 14 Work after inspection
14.1 Gas cylinders that pass the regular inspection should be marked or stamped with inspection marks and sprayed with inspection color codes in accordance with the provisions of Appendix 1 of the "Regulations on Safety Supervision of Gas Cylinders".
14.2 The inspection personnel must fill in the inspection and assessment results of the gas cylinders in the "Record of Regular Inspection and Assessment of Gas Cylinders". 14.3 The inspection unit is responsible for destroying the scrapped gas cylinders. The destruction method is flattening or sawing, and filling in the "Notice of Scrapping of Gas Cylinders" in accordance with the provisions of Appendix 4 of the "Regulations on Safety Supervision of Gas Cylinders" to notify the gas cylinder property unit. Scraped gas cylinders can be used at reduced pressure or converted to other gases in accordance with the provisions of LD96. Gas cylinders that are not suitable for use at reduced pressure or conversion shall be scrapped. 14.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.2 After the cylinder has passed the hydraulic pressure test, turn the bottle mouth downward for a period of time, wait for the residual water in the bottle to drain, and use the internal heating or external heating method to dry the inside.
GB13004--1999
11.3 The temperature of internal general drying is usually controlled at 70-80℃; the drying time shall not be less than 20min11.4 After removing the cylinder from the drying device, observe the drying condition inside the bottle with the help of an endoscope or a small light bulb. If the inner wall is completely dry, the bottle valve can be installed.
12 Bottle valve inspection and assembly
12.1 The bottle valve should be disassembled, inspected, cleaned and damaged parts replaced one by one to ensure free opening and closing and no leakage. 12.2 The valve body and other parts shall not be seriously deformed, and the threads shall not be seriously damaged. The requirements can be referred to the provisions of Chapter 7. 12.3 When replacing the bottle valve or sealing material, the appropriate bottle valve or material must be selected according to the nature of the medium contained. Before assembling the cylinder valve, the cylinder valve must be tested for air tightness.
12.4 The cylinder valve should be firmly assembled and the effective number of threads and sealing performance of its connection with the bottle mouth should be guaranteed. The number of exposed threads shall not be less than 1 to 2 threads.
13 Air tightness test
13.1 After the cylinder water pressure test is qualified, the air tightness test must be carried out one by one. The test device and method shall comply with the requirements of GB/T12137, and the test pressure shall be equal to the nominal working pressure of the cylinder. 13.2 The cylinders containing flammable or toxic gases and cylinders containing high-purity or mixed gases shall be tested for air tightness by immersion method. The cylinder shall be immersed in water for a pressure-maintaining time of not less than 2 minutes, and there shall be no leakage or pressure drop during the pressure-maintaining period. Cylinders containing other gases can be tested for air tightness by liquid coating method at the end of the first filling after regular inspection. The cylinder shall be kept under pressure with liquid for not less than 1 minute, and bubbles are not allowed to escape continuously. 13.3 During the gas cylinder air tightness test, the gas cylinder that leaks under the test pressure should be scrapped. 13.4 If the test device or bottle valve leaks during the test, the test should be stopped immediately and the test should be carried out again after repair or reassembly. 14 Work after inspection
14.1 Gas cylinders that pass the regular inspection should be marked or stamped with inspection marks and sprayed with inspection color codes in accordance with the provisions of Appendix 1 of the "Regulations on Safety Supervision of Gas Cylinders".
14.2 The inspection personnel must fill in the inspection and assessment results of the gas cylinders in the "Record of Regular Inspection and Assessment of Gas Cylinders". 14.3 The inspection unit is responsible for destroying the scrapped gas cylinders. The destruction method is flattening or sawing, and filling in the "Notice of Scrapping of Gas Cylinders" in accordance with the provisions of Appendix 4 of the "Regulations on Safety Supervision of Gas Cylinders" to notify the gas cylinder property unit. Scraped gas cylinders can be used at reduced pressure or converted to other gases in accordance with the provisions of LD96. Gas cylinders that are not suitable for use at reduced pressure or conversion shall be scrapped. 14.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.4 Gas cylinders that have passed the inspection must be repainted with the color mark of the gas cylinder according to the provisions of GB7144. 201
GB13004—1999
Appendix A
(Appendix of the standard)
Method for measuring the water volume of gas cylinders
The volume of gas cylinders must be measured after removing the rust and contamination in the cylinders to avoid errors. The measurement method is as follows: a) Pour clean fresh water into the test water tank in the inspection room and let it stand for a day and night. b) Place the gas cylinder that has passed the weight measurement upright on the floor of the inspection room, fill it with clean water drawn from the test water tank, and let it stand for 8 hours (generally, water should be filled on the first day and the volume should be measured on the second day). During this period, the wall of the bottle should be tapped from bottom to top several times with a wooden hammer and the water in the bottle should be filled up each time until the water level at the mouth of the bottle stops falling. c) When it is confirmed that all bubbles in the bottle have been removed and the liquid level at the bottle mouth is no longer dropping, move the gas cylinder to a weighing scale to measure the total weight of the bottle and water. d) Subtract the actual measured weight of the bottle (weight of the empty bottle) from the "total weight of the water in the bottle" to obtain the weight of the water in the bottle, and then multiply it by the volume of water per kilogram at the water temperature in the bottle when weighing (see Table A1) to obtain the current volume value of the gas cylinder Table A1 Volume of water per kilogram at different water temperatures Temperature, C
Volume,
Temperature, ℃
Volume, L
Temperature, ℃
Appendix B
(Suggestive Appendix)
Volume, L
Method for measuring the depth of depressions, pits, gouges and scratches B1 Method for measuring the depth of depression (h)
Temperature, C
Volume,
The depth is measured with the chord of the depression as the reference. The measuring tool is a height vernier caliper or a ruler. The ruler should be placed along the axis of the gas cylinder. The length of the ruler should be three times the maximum diameter of the depression, as shown in Figure B1a). The depth is measured based on the arc of the outer circumference of the cylinder body at the concave part. The measuring tool is an arc-shaped template. The arc-shaped template should be placed along the circumference. The arc length of the template should be greater than 2/5 of the circumference of the cylinder, as shown in Figure B1b). 292
Vernier caliper
Steel ruler
Method for measuring the depth of pits, dents and scratches B2
Any of the following two methods can be used: GB 13004—1999
Outer surface of steel cylinder
a) The depth of pits, dents and scratches is based on the deepest depth. The special measuring tool for measurement is shown in Figure B2. The radius of curvature of the profile of the card plate is consistent with the outer contour of the steel cylinder. The needle tip of the micrometer is inserted into the defect to measure its depth. The wedge angle of the needle tip should be less than or equal to 30° and the radius should be less than or equal to 0.25mm. During the measurement process, the reading of the micrometer should be regularly checked to eliminate the error caused by needle tip wear. Micrometer
Pits, bumps, scratches
Special pallet
b) Put the soft lead into the pits, bumps, scratches, take out the soft lead, and use a caliper to measure the maximum soft lead height, which is the measured depth value.
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.