The Stainless Steel Flange

Flange is a disc-shaped part, the most common in pipeline engineering, flanges are used in pairs. In pipeline manufacturing, Flanges are mainly used for the link of pipelines. In the pipelines that need to link, Various devices include a flange. deficient-Pressure pipelines can use wire flanges and welding flanges with pressures greater than 4 kg. Add sealing points within the two flanges, immediately after tighten with bolts. Flanges with different pressures have different thicknesses and use different bolts. When the water pump and valve are connected to the pipeline, some parts of these equipment are also made into corresponding flange shapes, also called flange connection. All connecting parts that are bolted and closed at the periphery of the two planes are generally called "flanges". For example, the connection of ventilation pipes, such parts can be called "flange parts". But this connection is only a part of the equipment, Such as the text between the flange and the pump, It is not easy to call the pump 'flange parts'. Smaller ones such like valves Wait, always be called 'flange parts'.

The main functions are:

1. Connect the pipeline and maintain the sealing performance of the pipeline;

2. Facilitate the replacement of a certain section of pipeline;

3. It is easy to disassemble and check the pipeline condition;

4. Facilitate the sealing of a certain section of pipeline.


The Stainless steel flange standard classification:


Specifications: 1/2″~80″(DN10-DN5000

Pressure rating: 0.25Mpa ~ 250Mpa (150Lb ~ 2500Lb)

Commonly used standards:

National standard: GB9112-88 (GB9113·1-88GB9123·36-88)

American Standard: ANSI B16.5, ANSI 16.47 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL)

German standard: DIN2527, 2543, 2545, 2566, 2572, 2573, 2576, 2631, 2632, 2633, 2634, 2638

(PL, SO, WN, BL, TH)

Italian standard: UNI2276, 2277, 2278, 6083, 6084, 6088, 6089, 2299, 2280, 2281, 2282, 2283

(PL, SO, WN, BL, TH)

British Standard: BS4504, 4506

Ministry of Chemical Industry standard: HG5010-52HG5028-58, HGJ44-91HGJ65-91

HG20592-97 (HG20593-97HG20614-97)

HG20615-97 (HG20616-97HG20635-97)

Machinery department standard: JB81-59JB86-59, JB/T79-94JB/T86-94

Pressure vessel standards: JB1157-82JB1160-82, JB4700-2000JB4707-2000

Marine flange standards: GB/T11694-94, GB/T3766-1996, GB/T11693-94, GB10746-89, GB/T4450-1995, GB/T11693-94, GB573-65, GB2506-89, CBM1012-81 , CBM1013, etc.

Stainless steel flange PN 

PN is the nominal pressure, indicating that the unit is MPa in the international unit system and kgf/cm2 in the engineering unit system

The determination of the nominal pressure should not only be based on the highest working pressure, but also the highest working temperature and material characteristics, not just satisfying that the nominal pressure is greater than the working pressure. Another parameter of the flange is DN, and DN is a parameter indicating the size of the flange.

Post time: Apr-13-2023