Th threaded flange

Th threaded flange refers to a type of flange that uses threads to connect with pipelines. The advantage of threaded flanges is that they do not require welding, and the additional torque generated on the cylinder or pipeline when the flange deforms is very small. The disadvantage is that the flange thickness is large and the cost is high. Th threaded flange is a non welded flange that processes the inner hole of the flange into a pipe thread and connects it with a threaded pipe. Compared with flat welding flanges or butt welding flanges, threaded flanges have the characteristics of easy installation and maintenance, and can be used on pipelines that are not allowed to be welded on site. Alloy steel flanges have sufficient strength, but are not easy to weld or have poor welding performance. Th threaded flanges can also be selected. 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

Flanges can be divided into carbon steel according to their manufacturing materials: (20 #, A3, Q235, Q23 excellent, Q235B, 20G, 16Mn, Q345, Q345R, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.)

Common execution standards for Th threaded flanges: The current flange standards in China are divided into two systems, namely PN series (European system) and Class series (American system). The pressure markings specified in this standard are divided into PN markings and Class markings. The PN label has 12 pressure levels, namely: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400。 The Class label has 6 pressure levels, namely: Class 150; Class 300; Class 600; Class 900; Class1500; Class 2500。 The implementation standards include GB series (standard), JB series (mechanical department), HG series (chemical department), ASME B16.5 (American standard), BS4504 (British standard), DIN (German standard), JIS (Japanese standard)

Standards: GB/T9112-2010, GB/T9119-2010, GB/T9116-2010, GB/T9115-2010

Chemical Department Standards: HG/T20592-2009, HG/T20615-2009, HG5010-52~HG5028-58, HGJ44-91~HGJ65-91, HG20592-97

American Standards: ASME B16.5, ASME B16.47

Mechanical Department Standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994