I’m confused about some standards related to flanges; could everyone please help analyze them? I’m utterly stuck – some specification model needs to be determined!

Reply to 1#: In September, there are flanges of type SO25A‑16 RF DN25 PN1.6, which are flat-welded raised-face flanges (for Series A pipe diameters); welding flanges of type SO50B‑16 RF DN50 PN1.6, also flat-welded raised-face flanges (for Series B pipe diameters); welding flanges of type SW10B‑16 RF DN10 PN1.6, socket-welded raised-face flanges (for Series B pipe diameters); welding flanges of type WN15B‑16 RF with S=3.0 DN15 PN1.6, which are welding raised-face flanges (for Series B pipe diameters). There is also a flange cover of type BL25‑16 RF DN25 PN1.6, a raised-face flange cover. What material does RSB refer to? It is reinforced flexible graphite sheet. Are there any PTFE-based non-metallic hoses available? Waisted butt-welded jacket flange WN80B－16 RF S=4.0 DN80 PN1.6 Butt-welded raised face flange Plate-type slip-on flange PLS0500B-2.5 RF DN25 PN2.5 Slip-on flat flange

Reply to 1#: For September, the flange SC25A‑16 RF SC – I’m not sure if this is a typo for “SO”; nominal diameter: 25, nominal pressure in the imperial series: 1.6 MPa. Seal type: raised face; it should be a butt-welded flange of type SO50B‑16 RF. It should actually be a necked flat-welded flange, with a nominal diameter of 25 and a nominal pressure of 1.6 MPa in the metric series; seal type: raised face. SW10B‑16 RF should be a socket-welded flange, with a nominal diameter of 10 and a nominal pressure of 1.6 MPa in the metric series; seal type: raised face. WN15B‑16 RF, where S=3.0, should be a necked butt-welded flange, with a nominal diameter of 15 and a nominal pressure of 1.6 MPa in the metric series; seal type: raised face, with a wall thickness at the joint of 3.0. The flange cover BL25‑16 RF should be considered a flange cover, with a nominal diameter of 25 and a nominal pressure of 1.6 MPa in the metric series; seal type: raised face. PLS0500B-2.5 RF is a plate-type flat-welded flange, with a nominal diameter of 50 and a nominal pressure of 2.5 MPa in the metric series; seal type: raised face. The gasket is represented by RSB, which stands for reinforced flexible graphite sheet (composite sheet). Is there any non-metallic hose made of PTFE? Only metal hoses with PTFE lining are known

This post was last edited by feng_200108047 on 2011-7-1 14:37. Flanges: SC25A－16 RF (SC is an error for SO; DN25 PN16 raised-neck flat-weld flange, Series A); SO50B－16 RF (DN50 PN16 raised-neck flat-weld flange, Series B); SW10B－16 RF (socket-weld raised-flange, Series B); Butt-weld flanges: WN15B－16 RF, S=3.0 (raised-neck butt-weld flange, Series B, with a tube thickness of 3 mm, i.e., 18×3); Flange covers: BL25－16 RF (DN25 PN16 raised-flange cover). What material does RSB refer to? (Reinforced flexible graphite sheet.) Are there any PTFE-based non-metallic hoses? (Yes) Welded jacket flange with neck, JWN80B－16 RF, S=4.0 ------- If it is a jacket type, data on the diameter change is missing. Plate flat welding flange PLS0500B-2.5 RF--------------------should be a typo; remove SO. Correct PL500B-2. 5RF

Dear friends above, where did you find these standards? Could you share it?

It is recommended that the original poster download the HG20592-2010 standard for steel pipe flanges; it contains detailed explanations and analyses

\"HG20592-97: Types and Parameters of Steel Pipe Flanges\" is available for download online; however, the attachment is too large to be uploaded. If you need it, I can send it to you!

Reply to 7# cumtsm: The flange standards of 97 are outdated; HG20592-2009 should be referred to

OK, thank you everyone. I’ve found the relevant information now, so we can close this thread