What are the quality inspection methods for 3pe anti-corrosion steel pipes

What are the quality inspection methods for 3pe steel pipes? The editor will take you through 5 steps to understand in detail:

1. Density test

The non dense defects in the welds of welded containers storing liquids or gases, such as penetrating cracks, pores, slag inclusions, lack of penetration, and loose structure, can be detected by density testing. The methods for testing density include kerosene test, water carrying test, water flushing test, etc.

2. Strength testing of pressure vessels

Pressure vessels must undergo strength tests in addition to sealing tests. There are two common types: hydrostatic test and pneumatic test. They can all test the weld tightness of containers and pipelines working under pressure. Pneumatic testing is more sensitive and rapid than hydraulic testing, and the tested products do not require drainage treatment, making it particularly suitable for products with difficult drainage.

But the danger of testing is greater than that of hydrostatic testing. When conducting experiments, follow the corresponding technical measures to prevent accidents from occurring during the testing process.

3. Static water test

Each steel pipe should undergo a hydrostatic pressure test without any leakage. The test pressure should be calculated according to the formula P=2ST/D, where S represents the test stress Mpa for the hydrostatic pressure test. The test stress for the hydrostatic pressure test should be selected at 60% of the yield value specified in the corresponding steel strip standard (Q235 is 235Mpa).

4. Verification of physical methods

The physical testing method is a method of measuring or testing using some physical phenomena. The inspection of internal defects in materials or workpieces is generally carried out using non-destructive testing methods. Non destructive testing includes ultrasonic testing, radiographic testing, penetrant testing, magnetic testing, etc.

5. On the surface, it can be inferred that it is a visual inspection.

The appearance inspection of welded joints is a simple and widely used inspection method, which is an important part of finished product inspection, mainly to discover defects and dimensional deviations on the surface of the weld seam. Generally, inspection is carried out through visual observation, using tools such as standard templates, gauges, and magnifying glasses. If there are defects on the surface of the weld seam, there is a possibility of defects inside the weld seam.