What does S stand for in pipe fitting specifications?
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This post was last edited by beileim1 on 2009-7-12 at 13:02. I have a question: In pipe fitting specifications such as concentric reducer 100×80-SCH40S, what does the “S” stand for? Also, in valve specifications (for example: gate valve 800LB DN25 SW), what do “SW” or “RF” mean? Thank you!
The “S” after 100×80-SCH40S denotes the grade designation for stainless steel pipes. 800LB DN25 SW) “SW” stands for socket-type, while “RF” stands for raised-face flange.
The above are the ANSI specifications! :)
SW, SOCKET WELDING
I would like to ask what the “S” in pipe fitting specifications such as concentric reducer 100×80-SCH40S stands for? The ‘S’ in this designation cannot be considered separately; it is necessary to look at the entire designation SCH40S to understand the pressure rating. If the ‘S’ is removed and we are left with just SCH40, then the wall thickness will also change. Generally, for diameters of 12 inches or more (i.e., 325 mm), the wall thicknesses of SCH40S and SCH40 are different, with the wall thickness of SCH40 being greater than that of SCH40S. Also, in valve specifications (for example: gate valve 800LB DN25 SW), what do “SW” or “RF” mean? Thank you! SW should be the same as SW in the flange, representing socket welding. The RF exam requirement is to have a protruding surface.
S stands for steel pipe, SW stands for socket weld, RF stands for raised face
Floor 2 explained it very clearly; Floor 5 was not quite right; Floor 6 gave an incorrect interpretation of the meaning of ‘s’ – it should be stainless steel. It’s possible that the wall thickness grades at the two ends of the reducer differ, so be careful. Adding RF behind the valve indicates that the valve is connected using a raised-face flange connection, while adding SW indicates a socket weld connection
SW SOCKET WELD RF RAISE FLANGE S STEEL STRENGTH
“I would like to ask what the “S” in pipe fitting specifications such as concentric reducer 100×80-SCH40S stands for? Also, in valve specifications (for example: gate valve 800LB DN25 SW), what do “SW” or “RF” mean? ” 1 The “S” after the reducer 100×80-SCH40S denotes stainless steel ； If it is SCH40, it refers to carbon steel ； 2 For example: Gate valve 800LB DN25 SW) “SW” or “RF” indicates the type of flange: “SW” refers to a socket weld flange ； ““RF” refers to the raised face seal in the types of flange sealing surfaces. To learn more, I hope that reading the relevant standards carefully will make things clear.