Testing Procedure of Type 3 & 4 CNG Cylinder

The testing process for Type 3 and Type 4 CNG (compressed natural gas) cylinders involves several steps to ensure they are safe, reliable and meet industry standards. Below is an overview of the testing process for these types of cylinders:

Type 3 CNG Cylinder Testing Process:

1. Visual Inspection: Perform a visual inspection of the cylinder to check for external damage, corrosion or manufacturing defects.

2. Ultrasonic Testing: Ultrasonic testing is performed to detect any internal flaws or defects in the cylinder wall, such as delamination or voids.

3. Burst test: The gas cylinder is ruptured by testing until its maximum capacity cannot be determined.

4. Fatigue testing: Cylinders are subjected to various high-pressure cycles to simulate real-life service and measure their durability and fatigue.

5. Fire test: Place the cylinder in a fire to test its ability to withstand high temperatures and prevent gas leakage or explosions.

6. Air pressure test: press the cylinder with oil and use special equipment to control the air pressure.

7. Certification: The cylinder is approved for use if it passes all tests and meets the required standards.

Type 4 CNG cylinder test procedure:

1. Visual Inspection: Similar to Type 3 cylinders, perform visual inspection to check for external damage, corrosion or manufacturing defects.

2. Hydrostatic testing: To check for leaks or structural defects, a cylinder is filled with water and pressed to a certain level.

3. Explosion test: Press the gas cylinder to the point where its maximum capacity cannot be determined.

4. Impact test: Perform an impact test on the cylinder to evaluate its structural integrity and ability to withstand external forces.

5. Fire testing: Similar to Type 3 cylinders, Type 4 cylinders are fired to test their ability to withstand high temperatures and prevent gas leakage or explosions.

6. Air pressure test: press the cylinder with oil and use special equipment to control the air pressure.

7. Certification: The cylinder is certified for use if it completes all tests and meets the required standards.