Complete list of standard specifications for stainless steel flange models

1、 Four mainstream execution standards (primary basis for selection)

Table 1 Summary of Flange Execution Standards

1. American standard ASME (foreign trade, chemical, oil and gas, Class pound, NPS inch)

1.ASME B16.5：NPS1/2"～NPS24"，压力 Class150/300/600/900/1500/2500（150LB~2500LB）

2. ASME B16.47: Large Bore NPS26; ~NPS60" , divided into A/B series, large pipeline flanges

2. Japanese standard JIS B2220 (Japanese and Korean equipment matching) pressure:5K、10K、16K、20K； Caliber: 15A~1500A

3. German standard DIN (European equipment):DIN2527~2635，PN6/10/16/25/40，DN15~DN1000

2、 6 major structural models of stainless steel flanges (industry code+purpose)

Table 2: Parameters of Flange Structure Types

3、 Sealing surface type (key selection)

1. RF protrusion (most commonly used): protrusion 2-3mm, universal water, acid and alkali atmospheric pressure, standard for all specifications

2. FF full plane: no protrusions, food and hygiene grade stainless steel pipes

3. MFM concave convex surface: concave embedded gasket, medium and high pressure anti gasket extrusion PN ≥ 2.5MPa

4. TG tenon groove surface: The groove is embedded with a sealing ring, which is highly toxic and corrosive medium

5. RJ ring connection surface: metal ring gasket, Class 600 or above ultra-high pressure and high temperature

4、 Commonly used stainless steel material grades (national standard/American standard comparison)

Table 3 Comparison Table of Stainless Steel Materials

5、 GB HG/T20592 PN16 (1.6MPa) RF protruding surface common specification size table (unit: mm, outer diameter of A-series steel pipe)

Table 4 PN16 National Standard Flange Size Table

6、 American standard Class150 (150LB) WN butt welding commonly used NPS specification (ASME B16.5)

Table 5 Class150 American standard flange parameters

7、 Example of selection annotation (ordering method)