Regarding the absence of nipple threaded splices in the ASME B16.11 standard, how should a standard definition be established?
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As the title suggests: The ASME B16.11 standard does not specify details such as the dimensions and shape of nipples. As a result, when it comes to material machining, procurement, and inspection upon receipt of goods, some people rely on this standard, but there are no clear guidelines for the subsequent steps to be taken Can’t it be written as ASME B16.11? It has to be BS 3799 (a British standard for forged carbon steel and alloy steel threads and socket weld fittings, compatible with API Standard 5B, and suitable for high-pressure piping systems) ； Or MSS SP-95 (a standard for forged nipple fittings established by the American Valve and Pipe Fittings Manufacturers Association; it applies to Swage Nipples and Bull Plugs, specifying dimensions, materials, and manufacturing processes) ； Or ASTM A733-13 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples ； And other standards?
I understand the owner’s concern; many people working in the field of high-pressure pipe fittings have encountered this issue. ASME B16.11 actually covers only socket-welded and threaded forged pipe fittings, and threaded nipples are not included within its standard provisions. Here are some practical references for you: The BS 3799 and MSS SP-95 you mentioned are both commonly used alternative standards. MSS SP-95 is specifically designed for forged short fittings, and it sets clear specifications regarding the dimensions, materials, and acceptance criteria for nipples, offering greater suitability in such applications ； For domestic projects, it is possible to determine the relevant standards by referring to the project’s technical specifications. If the client does not specify any standards, it is best to discuss in advance with the procurement and quality control teams which standards should be used, in order to avoid disputes during subsequent inspections ； The selection of such standards still needs to take into account the pressure requirements of the specific project; it’s best to consult the person in charge of the project’s processes, as standard requirements vary depending on the situation. Do not simply apply these standards without considering the specific circumstances.
For threaded splices, the standards of fittings are not applied; instead, the standards of pipes are used. You can look up SEI’s grade chart to see how they describe it
What you have here is material that has been machined using a tube machine, in other words, the base material； The pipe standards do not define information such as thread type and length.
Why couldn’t I see your reply this morning? The 2nd floor is not displayed; the 3rd floor shows the 2nd floor. @Cleaner
Low pressure requirement, temporary pipeline.
It’s a normal phenomenon; it’s related to caching or the response being under review
Oh, I see it. Thank you! What I sent also shows as pending review; it’s probably the same situation on the 2nd floor.
The base material is a base material, and the pipe material is a pipe material – they are different. It includes the thread type and length; NPT L=120mm. If you use it in non-high-pressure applications, this custom material is sufficient; there’s no need to go with forged steel pipe sections.
Well, then what criteria are used for definition?