There are up to 15 cylinder testing procedures, not including filling and equipment reset after testing.

1: remove the cylinder head valve

Workers need to be trained to do this, which includes 7 steps. In the process of unloading the valve, the workers should pay attention to listen for the sound of deflating. If the sound of deflating is heard, the valve should be stopped immediately and the valve should be unloaded after the gas is exhausted.

2: ultrasonic flaw detection

Professional instruments are required, using shear (or plate) reflection (or penetration) method.

3: hydraulic strength test

Use the "lateral hydrostatic" test: the test pressure and the force to be exerted on the sealing surface of the bottle mouth and the liquid static pressure exerted on the cylinder by the water in the water jacket during the lateral test.

4: internal high-pressure cleaning

After the preparation work, the high pressure cleaning machine will pump into the inside of the gas cylinder for high pressure cleaning. After cleaning, operate the manual control valve, compress the air into the inside of the cylinder for cold and dry treatment, and remove the residual water droplets inside the cylinder.

5: stereo check

Test hearing inspection, cylinder in the knock out of the sound between the strong, light and long, melodic sense of the bottle to become qualified, on the other hand, as scrapped bottle treatment.

6: check the bottle thread and collar

Inspect the surface of the screw thread by visual inspection or 10 x magnifying glass. In addition, check the solidity of the bottleneck circle. If unqualified items and defects that should be scrapped exceed the standard are found in the inspection, they should be confirmed by the person in charge of technology (quality) and the unqualified ones should be scrapped.

7: internal inspection

Use the hard tube of the endoscope to slowly insert into the cylinder and evenly scan the inner surface of the cylinder. If any problem is found, deal with it according to relevant regulations and make a record.

8: weight measurement

The weight of the cylinder was measured, the total weight of the bottle was weighed after water was injected into the cylinder, and the weight loss rate was recorded against the original weight of the cylinder and treated according to the numerical condition.

9: volumetric measurement

Measurement of cylinder volume. Fill with clean fresh water, move the gas cylinder to the weighing machine to weigh, record the relevant values and calculate the volume increase rate. If the volume augmentation rate is more than 10%, it needs to be treated as scrapped bottles.

10: determination of wall thickness

The ultrasonic thickness measuring instrument is installed to measure the thickness. The measurement method includes local thickness measurement and whole point thickness measurement.

11: dry treatment

After the remaining water in the bottle is drained, a blower and an electric heating device are used for drying treatment. After the treatment, an endoscope should be used to check the drying condition of the bottle from the mouth.

12: bottle valve

Reinstall the previously removed cylinder valve.

13: air tightness test

Use air tightness test equipment, operate according to specifications and verify test results are up to standard.

14: brush paint

The paint color of the cylinder surface should be correct, the paint film is even, the surface is smooth and shiny, not foaming, not peeling.

15: jet, steel seal

The cylinder color mark includes the contents of the words coated on the outer surface of the cylinder (including word color), the number of color rings (including color) and the color of the coating film.