GB 13076-1991 Periodic inspection and evaluation of dissolved acetylene cylinders
Some standard content:
National Standard of the People's Republic of China
Periodic inspection and evaluation of dissolved acetylene cylinders
Periodic inspection and evaluation of dissolved acetylene cylinders 1 Subject content and scope of application
This standard specifies the periodic inspection and evaluation of dissolved acetylene cylinders. GB13076-91
This standard applies to steel welded dissolved acetylene cylinders (hereinafter referred to as acetylene cylinders) with a limited filling pressure of less than 1.52MPa at a reference temperature of 15℃, a maximum allowable temperature of 40℃, a nominal volume of 10~601, containing porous fillers and solvents, movable and refillable 2 Reference standards
GB5100
Steel welded cylinders
GB10879
Dissolved acetylene cylinder valve
GB 11638
GB 12135
Dissolved acetylene cylindersbzxz.net
Technical conditions for regular cylinder inspection stations
Dissolved acetylene cylinder pressure test method
GB 13003
JJG14 Mobile Lever Scale
3 Terms
3.1 Scratches
The local wall thickness of the bottle body is thinned due to scratches or rubbing by sharp objects, and a linear mechanical damage with a sharp bottom is left on the surface of the bottle body. 3.2 Depression
The local collapse deformation of the wall thickness of the gas cylinder body caused by the impact or extrusion of blunt objects without obvious change. 3.3 Pitting corrosion
Isolated corrosion pits with a diameter not exceeding s and a distance of not less than 10s from each other. Note: - Simplified design wall thickness, that is, the steel stamp value on the shoulder of the acetylene cylinder. 3.4 Linear corrosion
Linear, chain or strip corrosion formed by continuous or intermittent corrosion pits. 3.5 Large-area uniform corrosion
Corrosion covering a large and relatively flat area on the surface of the bottle body. 4 Inspection Qualification
The periodic inspection unit of acetylene cylinders shall comply with the provisions of GB12135 and relevant documents of the Ministry of Labor. 5 Inspection Cycle
5.1 Acetylene cylinders shall be inspected and evaluated once every three years. 5.2 If any of the following conditions are found during the use of acetylene cylinders, they should be inspected at any time: Approved by the State Bureau of Technical Supervision on July 12, 1991 and implemented on April 1, 1992
The appearance of the cylinder is seriously damaged;
The temperature of the cylinder wall exceeds 40℃ during inflation;
c. When there is doubt about the quality of the filler and solvent; d. There are signs of acetylene tempering at the side nozzle of the cylinder valve. 6 Inspection preparation
GB13076-91
6.1 Before inspecting acetylene cylinders, the product certificate or resume should be verified; acetylene cylinders that have neither certificate nor resume, and whose shoulder stamps have unclear manufacturer name, manufacturing year and month (or last inspection year and month), simplified design minimum wall thickness and acetylene cylinder tare weight, will not be inspected. They will be inspected again after the information is ascertained. If it cannot be ascertained, they will be scrapped. 6.2 Use a pressure gauge with an accuracy of not less than 1.5 to measure the residual gas pressure of the inspected acetylene cylinder. If the residual gas pressure of the inspected acetylene cylinder exceeds 0.05MPa, the residual gas must be recovered and it is strictly forbidden to discharge it into the atmosphere. 6.3 Acetylene cylinders whose valves cannot be opened should be stored separately from other acetylene cylinders to be inspected, and proper methods should be adopted to deal with them. 6.4 Use a weighing instrument with a maximum weighing of 1.5 to 3.0 times the actual weighing and an allowable error that meets the "accuracy level" requirements of Article 17 of JJG14 to measure the mass of the acetylene cylinder under inspection. For an acetylene cylinder with a nominal volume of 40L, if the actual weight is greater than the tare weight by 1kg after the residual gas is released, the cause should be analyzed and properly handled.
6.5 Remove debris, dirt and loose coating from the outer surface of the acetylene cylinder. 7 Inspection and evaluation
7.1 Appearance of the cylinder
7.1.1 The appearance of the acetylene cylinder should be inspected one by one. 7.1.2 Acetylene cylinders with any of the following defects shall be scrapped: Cracks and/or bulges on the cylinder wall, cracks in the base joint weld; a.
The measured remaining wall thickness at the scratched part of the cylinder wall is less than 0.8s, and the measurement method shall be carried out in accordance with the provisions of Appendix H (reference); b.
The depth of the depression on the cylinder wall exceeds 1/10 of its short diameter or the maximum depth is greater than 6mm, and the measurement method shall be carried out in accordance with the provisions of Appendix A (supplement); c.
There are cracks on the cylinder wall with a depth of less than 6mm. The measured residual wall thickness at the dent is less than s, the bottle body is burned, deformed, the coating is burned (except for paint blistering), the fusible alloy on the bottle valve or fusible alloy plug is melted; the measured residual wall thickness at various corrosion sites is less than the requirements in Table 1. f.
Corrosion type
Pitting corrosion
Linear corrosion
Large area uniform corrosion
Measured residual wall thickness at the magic corrosion
7.2 Weld
7.2.1 The welds and heat affected zones of acetylene cylinders shall be inspected one by one. 7.2.2 Scratches on the main weld should be smoothed, and the transition should be smooth. 7.2.3 Acetylene cylinders with any of the following defects should be scrapped: a. The appearance of the weld does not meet the requirements of Article 6.3.3 of GB5100; after the scratches on the main weld are smoothed, the weld is lower than the parent material; b. The actual remaining wall thickness of the scratched area in the heat affected zone of the main weld is less than s; c. GB 13076—91
d. The maximum depth of the depression in the main weld and its heat-affected zone is greater than 5mm. 7.3 Valve seat and plug seat
7.3.1 The valve seat and plug seat of the acetylene cylinder shall be inspected one by one (the fusible plug shall not be removed). 7.3.2 Acetylene cylinders with the following defects shall be scrapped: a. The plug seat collapses, cracks or has deformation that affects the replacement of the fusible plug; b. The valve seat thread has axial damage or deformation that affects the sealing performance. 7.4 Packing
7.4.1 Re-measure the residual gas pressure in the acetylene cylinder. When it is confirmed that it does not exceed 0.05MPa, release the residual gas to balance it with the external air pressure. 7.4.2 Remove the acetylene cylinder valves one by one, carefully remove the filling material of the diversion hole, and then check the packing. 7.4.3 Use a special feeler gauge to measure the shoulder axial clearance at three points with a plane angle of 120°. The same specification of feeler gauge should not be measured more than twice at the same position. For special feeler gauges, see Appendix B (Supplement). 7.4.4 The packing of acetylene cylinders with any of the following defects shall be scrapped: If the packing is found to be disintegrated, cracked or flame-backed when observed from the bottle mouth; a.
b. Push and press the packing with fingers and the packing feels loose and soft; The axial clearance of the shoulder at any point exceeds 0.3% of the packing length, and for acetylene cylinders with a nominal volume of 40L, it exceeds 3.0mm; c.
d The radial clearance of the packing exceeds 0.4% of the packing diameter. The measurement method shall be in accordance with the provisions of Appendix C (Supplement). 7.5 Wall thickness
7.5.1 For acetylene cylinders with serious peeling of the bottle coating, the wall thickness shall be measured on the same longitudinal section of the bottle body, and the measuring points shall not be less than eight (two at the upper and lower head parts, and four at the cylinder part). Before the measurement, the paint and rust spots at each measuring point shall be removed, and then the thickness gauge with an error of no more than ±0.1mm shall be used to measure and record.
7.5.2 For acetylene cylinders with basically intact coating (without peeling of inner coating), only the wall thickness of the lower head inside the base shall be measured, but not less than two points.
7.5.3 Acetylene cylinders with the measured wall thickness at the thinnest point less than 0.8s shall be scrapped. 7.5.4 The wall thickness measurement and evaluation of scratches, corrosion and welds shall be carried out in accordance with the corresponding provisions in Articles 7.1.2 and 7.2.3. 7.6 Annex
7.6.1 Cylinder valves
7.6.1.1 Each acetylene cylinder valve shall be inspected; and an airtightness test shall be carried out in accordance with GB10879. After passing the test, a maintenance mark shall be placed on the valve body.
7.6.1.2 Cylinder valves with any of the following defects shall be replaced: a. The valve body has cracks or deformation that affects the use; b. The thread has axial damage or deformation.
7.6.2 Fusible alloy plug
No leakage is allowed during the air pressure test in Article 7.7. Otherwise, it should be replaced. 7.6.3 Bottle cap
The bottle cap should be easy to install and remove, and the connection should be reliable, and it should not affect the installation and clamping of the charging and discharging joints. Otherwise, it should be replaced. 7.6.4 Inspection mark ring
The inspection mark ring should have clear writing and rotate freely. Otherwise, it should be replaced. 7.7 Air pressure test
7.7.1 Preparation before the test
7.7.1.1 Load the guide hole filling material, felt pad and metal wire mesh that meet the requirements from the bottle mouth. 7.7.1.2 Install the inspection mark ring and qualified bottle valve on the acetylene bottle, and ensure that the cone thread of the bottle valve is exposed for 2 to 3 teeth. 7.7.2 Test method and evaluation
Perform according to GB13003.
7.7.3 Post-test processing
GB13076-91
Acetylene cylinders that have passed the pressure test should be sealed with nitrogen at a pressure of 0.050.1MPa. 8 Post-test processing
8.1 Test records
8.1.1 The test unit should fill in the "Comprehensive Record Form for Periodic Test and Assessment of Dissolved Acetylene Cylinders" in detail. The format is shown in Appendix D (Supplement), which shall be filed and kept for future reference by the test unit.
8.1.2 The inspection unit shall carefully fill in the "Resume Form of Dissolved Acetylene Cylinders". The format is shown in Appendix E (Supplementary), and shall be submitted to the acetylene cylinder filling unit or the property unit for filing and backup.
8.1.3 The inspection unit shall be responsible for destroying the scrapped acetylene cylinders. The destruction method shall be determined by the inspection unit, but it must be able to prevent them from being put into use again, and issue a "Notice of Dissolved Acetylene Cylinder Determination". The format is shown in Appendix F (Supplementary). Two copies are made, one of which is submitted to the acetylene cylinder property unit, and the inspection unit retains one copy for filing and reference. 8.2 Inspection Mark
8.2.1 After the acetylene cylinders pass the inspection, they shall be confirmed in accordance with the provisions of Chapter 9 of GB11638 Complete the steel stamp mark and stamp the following inspection steel stamp on the inspection mark ring:
a. Inspection unit code;
b. Inspection year, month and year of next inspection. 8.2.2 For scrapped acetylene cylinders, in addition to stamping the scrap steel stamp after the inspection unit's stamp on the inspection mark ring, a scrap steel stamp must also be stamped before the acetylene cylinder number stamped on the shoulder of the acetylene cylinder. 8.3 Coating
After cleaning the surface dirt and rust of acetylene cylinders that have passed the inspection, they should be coated in accordance with the provisions of Chapter 9 of GB11638, and the inspection color standard should be applied to the symmetrical part of the shoulder steel stamp mark. The color and shape of the inspection color standard are shown in Appendix G (Supplement). 304
A1 Measuring principle
As shown in Figure A1.
A2 Measuring instruments
GB 13076
Appendix A
Measuring method of depression depth
(supplement)
1-Vernier caliper; 2-Steel ruler; 3-
Acetylene cylinder
A2.1Vernier caliper 0~125mm, vernier reading value 0.10mm. A2.2Steel ruler 0～150mm.
A3 Measurement results
The deepest measurement result shall prevail, and the depression depth shall be calculated according to the following formula: h = Mmax —
-the deepest vernier caliper indication.
Where: Mmax —
GB13076--91
Appendix B
(Supplement)
Special feeler gauge for measuring shoulder axial clearance is manufactured as shown in the figure below. 110
Stamp according to thickness A
Technical requirements: sharp edge blunted, material: stainless steel Figure B1
C1 Measurement principle
As shown in Figure C1.
C2 Measuring instruments
GB1307691
Appendix C
Method for measuring radial clearance of packing
(Supplement)
Blood monitor
1-Curved hook; 2-Steel needle; 3-Magnetic scale ruler c2.1 Magnetic scale ruler 0~150mm, scale value 0.5mm. C2.2 Three-edged steel needle.
C2.3 Curved hook.
C3 Measurement results
Use the curved hook to push the packing so that it is close to one side of the bottle wall, and then use the curved hook to push the packing in the opposite direction. The distance the steel needle moves is the radial clearance value of the packing.
Marking ring
Fusible plug
Lower head
Upper head
GB 13076--91
GB13076--91
GB13076--91
Appendix F
Notice of scrapping of dissolved acetylene cylinders
(Supplement)
No.:
According to the "Safety Supervision Regulations for Dissolved Acetylene Cylinders" and the national standard (GB13076--91), after inspection, the acetylene cylinders of your unit have been scrapped and have been destructively treated. We hereby notify you. (Seal of the inspection unit)
(Or factory-compiled cylinder number)
Note: This form is in duplicate, one copy is filed by the inspection unit, and one copy is filed by the cylinder property unit. 310
Reasons for rejection
Inspector
Year of inspection
GB 13076—91
Appendix G
Color and shape of inspection color scale
(Supplement)
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RPO1)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
Note: ①The symbols and numbers in brackets represent the code of the color. ②The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80mm×40mm. ③The inspection color standard is a cycle every 10 years. Shape
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
H1 Measurement principle
GB 13076-91
Appendix H
Method for measuring scratch depth
(reference)
As shown in Figure H1, the needle tip under the dial indicator is inserted into the scratch to measure its depth. (a) Head part
(b) Simplified part
1-Dial gauge; 2-Cardboard, 3 Needle
Measuring equipment
H2.1 Dial gauge 0~3mm, graduation value 0.01mm. H2.2 The surface of the cardboard should be consistent with the theoretical shape of the cylinder. H2.3 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 zero point of the dial gauge should be checked regularly to eliminate the error caused by needle tip wear. H3 Measurement result
The deepest measurement result is used as the scratch depth. Additional notes:
This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Changzhou Aircraft Manufacturing Plant. The main drafters of this standard are Zhao Chanxing, Guo Zhang, and Xiu Changzheng. 3122 Steel ruler 0～150mm.
A3 Measurement result
The deepest measurement result shall prevail, and the depression depth shall be calculated according to the following formula: h = Mmax —
-the deepest vernier caliper indication.
Where: Mmax —
GB13076--91
Appendix B
(Supplement)
Special feeler gauge is used to measure the axial clearance of the shoulder as shown in the figure below. 110
Stamp according to thickness A
Technical requirements: sharp edge is blunted, material: stainless steel Figure B1
C1 Measurement principle
As shown in Figure C1.
C2 Measuring instruments
GB1307691
Appendix C
Method for measuring radial clearance of packing
(Supplement)
Blood monitor
1-Curved hook; 2-Steel needle; 3-Magnetic scale ruler c2.1 Magnetic scale ruler 0~150mm, scale value 0.5mm. C2.2 Three-edged steel needle.
C2.3 Curved hook.
C3 Measurement results
Use the curved hook to push the packing so that it is close to one side of the bottle wall, and then use the curved hook to push the packing in the opposite direction. The distance the steel needle moves is the radial clearance value of the packing.
Marking ring
Fusible plug
Lower head
Upper head
GB 13076--91
GB13076--91
GB13076--91
Appendix F
Notice of scrapping of dissolved acetylene cylinders
(Supplement)
No.:
According to the "Safety Supervision Regulations for Dissolved Acetylene Cylinders" and the national standard (GB13076--91), after inspection, the acetylene cylinders of your unit have been scrapped and have been destructively treated. We hereby notify you. (Seal of the inspection unit)
(Or factory-compiled cylinder number)
Note: This form is in duplicate, one copy is filed by the inspection unit, and one copy is filed by the cylinder property unit. 310
Reasons for rejection
Inspector
Year of inspection
GB 13076—91
Appendix G
Color and shape of inspection color scale
(Supplement)
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RPO1)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
Note: ①The symbols and numbers in brackets represent the code of the color. ②The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80mm×40mm. ③The inspection color standard is a cycle every 10 years. Shape
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
H1 Measurement principle
GB 13076-91
Appendix H
Method for measuring scratch depth
(reference)
As shown in Figure H1, the needle tip under the dial indicator is inserted into the scratch to measure its depth. (a) Head part
(b) Simplified part
1-Dial gauge; 2-Cardboard, 3 Needle
Measuring equipment
H2.1 Dial gauge 0~3mm, graduation value 0.01mm. H2.2 The surface of the cardboard should be consistent with the theoretical shape of the cylinder. H2.3 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 zero point of the dial gauge should be checked regularly to eliminate the error caused by needle tip wear. H3 Measurement result
The deepest measurement result is used as the scratch depth. Additional notes:
This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Changzhou Aircraft Manufacturing Plant. The main drafters of this standard are Zhao Chanxing, Guo Zhang, and Xiu Changzheng. 3122 Steel ruler 0～150mm.
A3 Measurement result
The deepest measurement result shall prevail, and the depression depth shall be calculated according to the following formula: h = Mmax —
-the deepest vernier caliper indication.
Where: Mmax —
GB13076--91
Appendix B
(Supplement)
Special feeler gauge is used to measure the axial clearance of the shoulder as shown in the figure below. 110
Stamp according to thickness A
Technical requirements: sharp edge is blunted, material: stainless steel Figure B1
C1 Measurement principle
As shown in Figure C1.
C2 Measuring instruments
GB1307691
Appendix C
Method for measuring radial clearance of packing
(Supplement)
Blood monitor
1-Curved hook; 2-Steel needle; 3-Magnetic scale ruler c2.1 Magnetic scale ruler 0~150mm, scale value 0.5mm. C2.2 Three-edged steel needle.
C2.3 Curved hook.
C3 Measurement results
Use the curved hook to push the packing so that it is close to one side of the bottle wall, and then use the curved hook to push the packing in the opposite direction. The distance the steel needle moves is the radial clearance value of the packing.
Marking ring
Fusible plug
Lower head
Upper head
GB 13076--91
GB13076--91
GB13076--91
Appendix F
Notice of scrapping of dissolved acetylene cylinders
(Supplement)
No.:
According to the "Safety Supervision Regulations for Dissolved Acetylene Cylinders" and the national standard (GB13076--91), after inspection, the acetylene cylinders of your unit have been scrapped and have been destructively treated. We hereby notify you. (Seal of the inspection unit)
(Or factory-compiled cylinder number)
Note: This form is in duplicate, one copy is filed by the inspection unit, and one copy is filed by the cylinder property unit. 310
Reasons for rejection
Inspector
Year of inspection
GB 13076—91
Appendix G
Color and shape of inspection color scale
(Supplement)
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RPO1)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
Note: ①The symbols and numbers in brackets represent the code of the color. ②The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80mm×40mm. ③The inspection color standard is a cycle every 10 years. Shape
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
H1 Measurement principle
GB 13076-91
Appendix H
Method for measuring scratch depth
(reference)
As shown in Figure H1, the needle tip under the dial indicator is inserted into the scratch to measure its depth. (a) Head part
(b) Simplified part
1-Dial gauge; 2-Cardboard, 3 Needle
Measuring equipment
H2.1 Dial gauge 0~3mm, graduation value 0.01mm. H2.2 The surface of the cardboard should be consistent with the theoretical shape of the cylinder. H2.3 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 zero point of the dial gauge should be checked regularly to eliminate the error caused by needle tip wear. H3 Measurement result
The deepest measurement result is used as the scratch depth. Additional notes:
This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Changzhou Aircraft Manufacturing Plant. The main drafters of this standard are Zhao Chanxing, Guo Zhang, and Xiu Changzheng. 312
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