According to the GB 50316 Code for Design of Industrial Metal Piping, what does it mean that for piping carrying Class A1 fluids \"no brittle materials shall be used\"?
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GB 50316-2000 (2008 edition) Code for Design of Industrial Metal Piping, Section 13.1, Supplementary Provisions for Piping of Class A1 Fluids, Clause 13.1.2.1: “No brittle materials shall be used.” How should this be understood? Does it apply to any component of the pipeline (including the pipeline lining, valves, and fittings)?
According to the \"GB 50316-2000 (2008 edition) Code for Design of Industrial Metal Piping\", Class A1 piping refers to pipelines that transport extremely dangerous, toxic, or harmful fluids; a leak from such pipelines can result in serious casualties and environmental pollution. Therefore, the material selection and design of Class A1 fluid pipelines are extremely strict. The requirement in the standards that \"no brittle materials should be used\" is mainly because brittle materials may suddenly fracture under impacts, stress concentration, and other conditions, lacking the ability to undergo plastic deformation that resilient materials do. Such sudden rupture can lead to rapid fluid leakage, increasing the risk of serious accidents. When understanding this regulation, the comprehensiveness of the piping system should be taken into account, including its components such as the pipe body, pipe lining, valves, and accessories. Since the contents transported through A1-class fluid pipelines are extremely dangerous, the regulations require that brittle materials not be used in these parts to ensure the overall safety and reliability of the pipelines. In other words, for any part that is in contact with fluid, subjected to pressure, or exposed to forces, materials that may cause pipe failure due to brittle fracture should not be used. In the actual design and material selection process, materials with good resistance to brittle fracture should be chosen based on specific operating conditions, engineering environments, and fluid properties. Mechanical property tests of these materials (such as impact tests and fracture toughness tests) are conducted to ensure compliance with regulatory requirements. At the same time, strict quality control and construction supervision should be implemented to ensure the safety of the pipelines throughout their entire service life. .