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The most comprehensive cylinder service life and regular inspection cycle

Views:4     Author:Site Editor     Publish Time: 2020-11-10      Origin:Site

In China, all gas cylinders have a maximum use limit. After expiration, regardless of whether they are used or in good condition, they must be scrapped. According to the latest national standards, the specific classifications are as follows:

NumberTypeDesign service life
1Steel seamless gas cylinder30 years
2Steel welded gas cylinder20 years
3Aluminum alloy seamless gas cylinder
4Large volume copper seamless gas cylinders for long tube trailers and tube bundle containers
5Dissolved acetylene gas cylinder and adsorption type natural gas welded steel cylinder
6Compressed natural gas cylinders for vehicles15 years
7LPG cylinders for vehicles and liquefied dimethyl ether cylinders for vehicles
8Steel liner glass fiber ring-wound gas cylinder
9Aluminum alloy inner liner fiber fully wound gas cylinder
10Circumferential winding gas cylinder with aluminum alloy inner liner
11Civil liquefied petroleum gas cylinders and dimethyl ether cylinders15 years (or 8 years) (Note 1)
12Steel seamless gas cylinders and steel welded gas cylinders that contain corrosive gases or are used in corrosive environments such as the ocean12 years

Note 1:

     1) Steel cylinders manufactured in accordance with the provisions of GB5842-1996 "Liquefied Petroleum Gas Cylinders" have a design service life of 15 years from the day they leave the factory, and they will be scrapped after 15 years.

     2) Cylinders manufactured in accordance with the national standard GB5842-2006 "Liquefied Petroleum Gas Cylinders" have a design service life of 8 years from the day they leave the factory, and they will be scrapped after 8 years.

     All gas cylinders need to be inspected periodically after they leave the factory. Different gas cylinders have different periodic inspection cycles. According to the latest national standards, the specific classifications are as follows:

Number
Cylinder varietyInspection cycle
1Steel seamless gas cylinders and aluminum alloy seamless gas cylinders

(1) Cylinders containing nitrogen, argon, helium, sulfur hexafluoride, inert gas, and non-corrosive high-purity gas with a purity of 99.999% or more shall be inspected every 5 years;

(2) Gas cylinders, diving gas cylinders and gas cylinders that are often in contact with seawater that contain gases that can corrode the material of the bottle body shall be inspected once every two years;

(3) Cylinders containing other gases shall be inspected every 3 years

2Steel welded gas cylinder

(1) Cylinders containing general gases shall be inspected every 3 years

(2) Cylinders containing corrosive gases shall be inspected every 2 years

3Dissolved acetylene gas cylinderInspection every 3 years
4Liquefied petroleum gas cylinderAccording to the national standard GB8334, it is generally inspected every 4 years
5LPG cylinders for vehiclesInspection every 5 years
6Welded insulated gas cylinderInspection and maintenance every 5 years
7Car LNG welded insulated gas cylinderInspection and maintenance every 3 years
8Composite gas cylinder for respiratorInspection every 3 years
9Winding cylinder for carInspection every 5 years(Or shorten the time according to local standards)
10Compressed natural gas bottle for vehicle

(1) Inspection every 3 years, and every 2 years thereafter

(2) Taxi bottles are inspected every 2 years and every year thereafter

Treatment beyond the design service life

  Cylinders should generally be scrapped when their service life exceeds their design service life. The compressed natural gas cylinders installed by taxis should be scrapped when the service life reaches 8 years; the gas cylinders for vehicles should be scrapped together with the taxi. For welded insulated gas cylinders (including welded insulated gas cylinders for vehicles), if the insulation performance cannot meet the requirements for use and cannot be repaired, it shall be scrapped. For gas cylinders with unclear design service life, the design service life specified in the above table shall be used as the basis for the disposal of the gas cylinder.

  For liquefied petroleum gas cylinders with a designed service life of 8 years, it is allowed to extend the service life after safety assessment. The service life can only be extended once, and the extended service life shall not exceed one inspection cycle of the gas cylinder. For liquefied petroleum gas cylinders that have not specified a design service life, those with a service life of 15 years shall be scrapped and be treated as a function of elimination.


Advance inspection

  During use, if one of the following conditions is found in the gas cylinder, regular inspections should be carried out in advance:

  (1) There is serious corrosion, damage or doubts about its safety and reliability;

  (2) The winding layer of the winding cylinder is seriously damaged;

  (3) Inventory or use after being out of service for more than one inspection period;

  (4) The motor vehicle is put into service after a traffic accident that may affect the safe use of vehicle gas cylinders;

  (5) Other situations where the gas cylinder inspection standards require regular inspections in advance and the inspection personnel (or filling personnel) deem it necessary to conduct inspections in advance.


Cylinder inspection pretreatment

  Before regular inspections of gas cylinders, the residual gas in the cylinders should be recovered and processed. Recycling and disposal meet at least the following requirements:

  (1) The residual gas in the cylinder containing toxic and combustible gas shall be recycled and treated in an environmentally friendly manner and shall not be discharged into the atmosphere;

  (2) After confirming that the pressure in the cylinder has dropped to zero, the cylinder valve can be removed;

  (3) Cylinders containing combustible gas must be replaced; cylinders containing combustible liquefied gas such as liquefied petroleum gas must be steam purged or other methods that do not damage the material of the cylinder body and do not reduce the performance of the cylinder body material for internal treatment, Meet the specified safety requirements, otherwise, it is strictly prohibited to use compressed air for air tightness test.


Inspection items and requirements:

  (1) The items and requirements for regular inspection of various gas cylinders shall comply with the relevant safety technical specifications and the corresponding national standards;

  (2) Periodic inspection of gas cylinders should be carried out one by one. Gas cylinders or cylinder valves found to have been welded, repaired, dug, disassembled, or refurbished during the inspection should be scrapped;

  (3) The gas cylinder regular inspection agency shall ensure that the gas cylinders and gas cylinder valves that have passed the inspection can be safely used for one inspection cycle under normal use conditions, and the gas cylinders that cannot be used safely to the next inspection cycle should be scrapped. Cylinder valves that cannot be used safely until the next inspection cycle should be replaced.


Inspection records and reports

   The gas cylinder periodic inspection agency shall carefully fill in the inspection records, and shall promptly issue a gas cylinder inspection report for the gas cylinders that have passed the inspection or are scrapped after the inspection. The inspection records and inspection reports shall be true and accurate.


Eliminate the use of functional processing

   The disposal of the function of eliminating the use of the waste gas bottle is responsible for the unit designated by the local quality supervision department. Elimination of the use of functions should be carried out by squashing or disassembling the bottle body and other irreparable methods, and no drilling or damage to the bottle thread should be used.


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