Standard System for Application in the Petrochemical Industry

◆ The pipe size series standard (SH3405) basically belongs to the "large outer diameter series".

SH3405 is equivalent to adopting the ISO4200 standard, so when DN ≤ 1100mm, it can be used in conjunction with the ANSI B36.1/36.19 standard.

◆ The flange standard (SH3406) belongs to "American flange".

Nominal pressure: PN10 PN20 (CL150) PN50 (CL300) PN68(CL400) PN100(CL600)

PN150(CL900) PN250(CL1500) PN420(CL2500)  8 grades

Nominal diameter: DN15 - DN1500mm

Flange sealing surface: When DN ≤ 600, there are 5 types: raised face, concave-convex face, full plane, tenon groove face, and ring groove face; when DN ≥ 650, there is 1 type: raised face

Flange type: When DN ≤ 600, there are 5 types: flat welding, butt welding, socket welding, threaded connection, and loose fitting; when DN ≥ 650, there is 1 type: butt welding

SH3406 has adopted the standards of ANSI B16.5 and API 605. SH3406 has good interchangeability in structural dimensions and sealing surface types with ANSI B16.5/API 605. It can be used in conjunction with pipeline components from ANSI, API, MSS, etc.

Because SH3406 adopts China's material standards instead of American material standards (ASTM), there is a slight deviation in temperature-pressure tables between them. Therefore, when considering their interchangeability, it is necessary to pay attention to and verify their corresponding allowable values for temperature-pressure.

◆ Common standards in the application standard system of the petrochemical industry

SH3401 Pipe flange with asbestos rubber gasket

SH3402 Pipe flange with polytetrafluoroethylene coated gasket

SH3403 Pipe flange with metal ring gasket

SH3404 Pipe flange fasteners

SH3405 Series of pipe dimensions for petrochemical enterprises

SH3406 Petrochemical steel pipe flanges

SH3407 Woven-type gasket for pipe flanges

SH3408 Steel welded seamless pipe fittings

SH3409 Steel plate welded pipe fittings

SH3410 Cast steel socket-welding pipe fittings

The application standard system of the petrochemical industry belongs to a relatively complete application standard system. Because it adopts the ANSI standard equivalently, it represents advanced and development directions. Also, because its flange (SH3406) can be used in conjunction with API standard valves. Through recent applications, this application standard system is a scientific, advanced, and operable standard system.