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Jan 09, 2026TP321 or TP347 over TP304Q1: What is the most common austenitic stainless grade for general corrosive service? A1: ASTM A312/A358 TP304/304L. 304L (low carbon) is preferred for welded construction to minim -
Jan 09, 2026grade for welded boiler tubesQ1: Which is the primary grade for welded boiler tubes and superheaters? A1: ASTM A178 Grade A (C-minimum carbon steel) or Grade C (C-Mn steel) for ERW tubes. They offer good stren -
Jan 09, 2026What is a bellows type expansion jointA bellows expansion joint, also known as an expansion joint or telescoping joint, is a compensating element that uses the elastic deformation of a bellows to compensate for thermal -
Jan 09, 2026key characteristic of ASTM A252 pipeQ1: What is the standard grade for general structural purpose welded pipe? A1: ASTM A53 Grade B (ERW or continuous welded). It is a versatile carbon steel pipe for structural suppo -
Jan 09, 2026What is a pup jointCarbon steel pup joints are standardized fittings used in industrial piping systems to connect different pipe sections or equipment. They are mainly divided into two categories: th -
Jan 09, 2026What is the purpose of a dismantling JointThe detachable joint relies on a piston (or plunger) that reciprocates within the detachable joint cylinder to change the volume of the cylinder, and in conjunction with two check -
Jan 09, 2026What is Flanged Expansion JointFlange expansion joints are a new product for connecting equipment such as pumps, valves, and pipelines. They are made into a whole by bolting and retain displacement, making them -
Jan 09, 2026What are the three types of expansion jointsExpansion joints, as pipeline compensation joints, are important devices for connecting pumps, valves, pipelines, and other equipment to pipelines. They use bolts to connect the va -
Jan 09, 2026distinguishes API 5L PSL1 from PSL2Q1: What is the most common grade for onshore natural gas pipelines, and why? A1: API 5L X70 (PSL2) is most common. It offers an excellent balance of high strength (~485 MPa yield) -
Jan 09, 2026What is a rubber expansion joint used forRubber expansion joints (also known as rubber compensators or flexible joints) are widely used in water supply and drainage, sewage treatment, chemical and other fields due to thei -
Jan 09, 2026What is the purpose of an expansion jointAn expansion joint is a flexible element that effectively compensates for axial deformation. For example, expansion joints welded to the shell of a fixed tubesheet heat exchanger h -
Jan 09, 2026What are rubber expansion jointsRubber expansion joints, also known as rubber compensators, are devices used to connect pipelines and are designed to address the expansion and contraction issues caused by thermal
