Manufacturer Reveals Fire Gas Cylinder Inspection Process

1. Release of on-site fire alarm
The construction leader and main construction personnel will come to the site to clarify the construction requirements, remove the wiring on the solenoid valve, and if the host alarms, press the mute button.
2. Equipment disassembly and transportation
① Remove the starting cylinder (or active cylinder) starting copper pipe nut, starting cylinder solenoid valve and circuit, and starting pipeline in sequence;
② Remove the high-pressure hoses, pilot valves, wear the cylinder head cap, remove the cylinder clamp, remove the cylinder in sequence, and place the dismantled equipment in a standardized position designated by Party A;
③ During the plane transportation process, a dedicated steel cylinder trolley should be used, and the steel cylinder equipment should be bundled and packaged in groups using wooden pallets;
④ Keep the protective cover of the cylinder head valve intact to prevent accidental spraying during unloading and handling;
⑤ Arrange forklift drivers to unload the goods and place them on a flat surface to prevent them from tipping.
3. Inspect gas cylinders
Check the quantity of gas cylinders submitted for inspection, inspect their manufacturing and inspection steel seals for compliance with relevant regulations and technical standards. Gas cylinders with unclear manufacturing steel seals or incomplete key items (including hydraulic test pressure, simplified design wall thickness, manufacturing unit inspection mark, and manufacturing date) without evidence shall not be inspected and shall be disposed of as scrap; Identify the number of missing or damaged caps, shockproof rings, cylinder valves, and other accessories for various gas cylinders; Check one by one whether the paint color and words of the gas cylinders match the containing medium.
4. Emissions of residual gases
For non flammable gases containing non-toxic substances, the remaining gas in the bottle can be directly discharged into the air; When using the "vent" method to discharge the remaining gas in the bottle containing non-toxic combustible gases, the gas cylinder should be placed on a metal plate with measures to eliminate static electricity in advance to prevent fire accidents caused by static electricity igniting the discharged gas; For toxic gases contained in containers, "evacuation" treatment is adopted.
5. Remove the cylinder head valve and shockproof ring
The unloading valve must be installed on the cylinder valve loading and unloading machine, or the cylinder must be fixed on the cylinder clamping frame with a fixture. The manual unloading valve and shockproof ring must be used to check whether the cylinder valve meets the relevant regulations and requirements, and whether the filling cylinder valve meets the requirements of the filling medium.
6. Derusting of the inner and outer surfaces of gas cylinders
The operation method is: pour the steel ball into the gas cylinder on the inner surface and roll it on the rolling machine to remove rust; The outer surface is polished with a grinding wheel and rust is removed with a steel wire brush.
7. Original Mark Registration
Register the manufacturer code, bottle number, water pressure, nominal pressure, original weight, original volume, original wall thickness, factory date, and filling medium.
8. Hydrostatic test
Using the "outer side method water pressure" test, the test pressure and the liquid static pressure applied to the cylinder by the water in the water jacket during the outer side method, as well as the force required on the sealing surface of the tested bottle mouth.
9. Inspection of Bottle Mouth Thread and Neck Ring
The thread of the bottle mouth shall not have cracks or crack like defects, but slight damage to the thread of the bottle mouth is allowed. For high-pressure gas cylinders, a gap not exceeding teeth is allowed, and for low-pressure gas cylinders, a gap not exceeding teeth is allowed. The length of the gap shall not exceed the circumference, and the depth of the gap shall not exceed the tooth height.
The firmness and thread condition of the collar should be checked one by one and should not be skewed or loose. Gas cylinders that cannot be reinforced or have damaged collars and cannot be replaced shall be confirmed by the technical (quality) responsible person and scrapped. If a gas cylinder is found to have neck or bottle mouth damage caused by welding or brazing to reinforce the original neck ring, it should be scrapped. The neck ring thread is intact, and if the thread has been severely damaged and it cannot be securely worn, the neck ring should be replaced. If it cannot be replaced, the gas cylinder should be scrapped.
10. External surface inspection of gas cylinders
Gas cylinders should be visually inspected one by one to check for defects such as dents, pits, protrusions, damage, cracks, corrosion, or burns on their outer surfaces.
11. Internal surface inspection of gas cylinders
Apply an endoscope or a safety light with a voltage not exceeding sufficient brightness to conduct an internal inspection of each gas cylinder. If there are debris such as sediment, rust powder, rust blocks, hemp threads, cloth pieces, etc. falling into the bottle, it must be rinsed with water and inspected after removing the debris.
12. Audio inspection
Gas cylinders that pass the appearance and external surface inspection should be subjected to a sound inspection one by one to determine whether there are any hidden dangers on the cylinder wall and whether there is corrosion on the internal and internal surfaces; When there are no attachments or other obstacles to the vibration of the cylinder, lightly tap the cylinder wall with a small copper hammer. If the sound emitted is crisp and powerful, the aftertaste is clear and long, and there is a sense of melody, it is considered qualified for inspection.
13. Weight and volume determination
Gas cylinders should be weighed one by one for the purpose of further identifying the degree of corrosion of the cylinders. After filling the bottle with water, weigh the total weight of the bottle water, compare it with the original weight of the cylinder, and check whether the strength of the cylinder meets the standard requirements based on the weight loss rate.