GOST 33259-2015 GOST 12821-80 Ct20 Weld neck Flange

GOST 33259-2015. Flanges for valves, fittings and pipelines for pressure to PN 250. Design, dimensions and general technical requirements.

Prepared on the basis of GOST R 54432-2011, instead of GOST 12815-80, GOST 12816-80, GOST 12817-80, GOST 12818-80, GOST 12819-80, GOST 12820-80, GOST 12821-80, GOST 12822-80   (By order of the Federal Agency for Technical Regulation and Metrology dated May 26, 2015 GOST R 54432-2011 was canceled from April 1, 2017).

This standard takes into account the main regulatory provisions of the following international standards: – ISO 7005-1: 2011 “Pipeline flanges. Part 1. Steel flanges for industrial and general service piping systems (NEQ)– ISO 7005-2: 1988, Metal flanges. Part 2. Cast iron flanges “(” Metallic flanges-Part 2: Cast iron flanges “, NEQ).

GOST 33259-2015 applies to connecting flanges of pipeline fittings (hereinafter referred to as fittings), fittings and pipelines, as well as connecting flanges of machines, equipment, instruments, branch pipes, apparatuses and tanks for nominal pressure up to PN 250 and establishes the design and dimensions of steel and cast iron flanges, determines the types of flanges, types of forms of sealing surfaces, establishes technical requirements for manufacturing, marking, testing and control.

Download GOST 33259-2015 in PDF

Depending on the purpose of the pipeline and the working media transported through it, flanges are made of steels of various grades, including corrosion-resistant ones:

GOST 33259-2015 Type11 Weld neck flanges

Ct20 St20 is a popular gost steel grade for Carbon steel flanges.

Steel 20 (GOST )   and its European equivalent C22 (1.0402) ( EN )

Фланцы Ст.20 ГОСТ 12820-80 FLANGE ГОСT 33259 TYPE01,TYPE 02,TYPE 05 ГОСТ 12820 ГОСТ 12821 PN06 PN10 PN10 PN16 PN25 PN40