The quality requirements for pipe fittings mainly include the following aspects:
Material selection and inspection: The materials of pipe fittings should be selected according to the characteristics of the working environment and working pressure. Commonly used materials include cast iron, stainless steel, carbon steel, etc. When selecting materials, it is necessary to consider its corrosion resistance, strength and sealing requirements. To ensure the quality of pipe fitting materials, chemical composition analysis, mechanical properties testing and non-destructive testing are required.
Appearance quality requirements: The surface of pipe fittings should be smooth and free of obvious scratches, scars and pores. The surface finish can be tested with a metal surface roughness tester. The dimensional accuracy should meet the design requirements. The outer diameter, inner diameter, wall thickness and other dimensions of the pipe fittings need to be accurately measured to ensure their accuracy.
Mechanical performance requirements: The tensile strength, yield strength and impact toughness of pipe fittings are their important mechanical performance indicators. These properties can be tested through tensile tests and impact tests, and the standard requirements should meet the requirements specified in relevant standards.
Air tightness requirements: The air tightness of pipe fittings is an important indicator to ensure its reliable connection. During the production process, air tightness testing is required, and the standard requirements should meet the requirements specified in relevant standards.
Corrosion resistance requirements: Pipe fittings will be affected by corrosion in different working environments, so corrosion resistance is very important. The corrosion resistance of pipe fittings can be tested through corrosion tests, and the standard requirements should meet the requirements specified in relevant standards.
Other quality requirements: The acceptance of pipe fittings should also check the marking, specifications, materials, appearance and geometric dimensions. Alloy steel parts should be checked for spectrum and hardness, flanges, bolts, nuts and other accessories should be checked for matching performance, and valves should be checked for performance and tightness in accordance with relevant national or industry standards.
