Concentric reducer

When the projection of different diameter pipe set up after the two port is concentric circles, it is called concentric reducer, concentric reducer is connected, it is the form of different diameter pipe and steel pipe butt welding, the main manufacturing standard concentric reducer is generally GB/T12459, GB/T13401, ASME, SH3408, SH3409, B16.9 HG/T21635, HG/T21631, SY/T0510. The eccentric reducer is made of carbon steel, alloy steel and stainless steel.

Classification of concentric reducers

Material partition

Carbon steel: ASTM/ASME, A234, WPB, WPC

Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N

ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti

ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

Low temperature steel: ASTM/ASME A402 WPL3-WPL 6

High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, Aluminum Alloy, plastics, PVC, argon Ge Lek, PPR, RFPP (reinforced polypropylene) etc..

Division by making method

Divide into.

Division of manufacturing standards

Divided into national standards, electricity standard, ship standard, standard, standard, American Standard, German standard, Japanese standard, Russian standard, etc..

Dividing the radius of curvature

It is divided into long radius elbow and short radius elbow. The long radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the pipe, namely R=1.5D; the short radius elbow refers to its radius of curvature equal to the outer diameter of the pipe, that is, R=1.0D. (D is elbow diameter, R is radius of curvature). 5. if divided by the pressure level to about seventeen, and the American Standard pipe is the same, are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; one of the most commonly used is STD and XS two.

Standard system

There are two systems in the international standard for pipe flanges, namely, the European pipe flange system represented by the German DIN (including the former Soviet Union) and the American pipe flange system represented by the American ANSI pipe flange. In addition, there are Japanese JIS pipe flanges, but they are generally used only in public utilities in petrochemical plants, and have less international influence. The pipe flanges are introduced below:

1, the European system pipe flanges represented by Germany and the former Soviet Union

2, American system pipe flange standards, represented by ANSI B16.5 and ANSI B 16.47

3, the British and French pipe flange standards, the two countries have two casing flange standards.

To sum up, the international general standard pipe flange can be divided into two different, and not interchangeable flange system: one to Germany on behalf of the European pipe flange system; another is represented by the United States of America pipe flange system.

IOS7005-1 is a standard issued by the international organization for Standardization in 1992. This standard is actually the pipe flange standard which combines the two series of pipe flanges of the United States and germany.