American standard NPT threaded flange

American standard NPT threaded flange, also known as American standard threaded flange, NPT thread is a type of American standard 60 degree cone pipe thread. Threaded threaded flange is a common connection method for flanges, and its principle is the same as that of screws. Threaded flange is a widely used flange structure in engineering construction, which has the advantages of easy on-site installation and no need for welding. Threaded flanges can be used on pipelines that are not allowed to be welded on site, such as air conditioning water systems, fire protection pipelines, etc. The fittings on the tap water pipeline are threaded. However, under conditions of rapid temperature changes in the pipeline or temperatures above 260 ℃ but below -45 ℃, it is recommended not to use threaded flanges to avoid leakage. The connection process of threaded flanges involves using a threading machine to thread threads at both ends of the pipeline, and using a threading method to firmly connect the pipeline to the threaded flange. Common threaded connection pipes include:; Seamless steel pipes, galvanized steel pipes, etc.

The material of threaded flanges can be divided into: carbon steel: (20 #, A3, Q235A, Q235B, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, 0Cr18Ni9, 00Cr19Ni10, etc.)

Execution standard for American standard NPT threaded flange: ASME/ANSI B16.11

The Class label has 6 pressure levels

分别为： Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500

National standard for threaded flanges: GB/T 9114-2010 Threaded steel pipe flanges with necks

The PN tag has 12 pressure levels

分别为： PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400