Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations IDS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Why A182 F6 (410 - 13%Cr) material ins not in ASME B16.34

Status
Not open for further replies.

msmedesign

Mechanical
Sep 9, 2001
29
I wondering why ASTM A182 F6 or A276/A479 Grade 410 material is not included in ASME B16.34 material list.

410 grade material has been used as stem material (Stem is also pressire retaining part)

Thanks
 
Replies continue below

Recommended for you

The "B16.34 materials" are those allowable by the B16 committee for pressure containing parts or those directly affecting the pressure containment boundary (para 5.1). They are selected based on many factors that influence structural integerity over time.

The valve manufacturer can use whatever is appropriate for stems, seats, etc.

Remember, a B16.34 valve doesn't neccesarily have to "work", it just is unlikely to blow up.

 
Stem is considered Pressure Controlling Part (That is how valve industry treats stem). You may refer to API where in such explanations appear
 
msmedesign,

If your question relates purely to why the Code didn't consider these materials, it might be better asked in the ASME Code Issues section (under Engineering Codes, Standards & Certifications).

If instead you're really asking "Is it ok for me to use these materials in a valve that has to meet B16.34", the answer is "probably not." You would need to do a detailed materials comparison to show that the metals are similar enough to a material in B16.34 and have your customer buy off on it.

If your question is morphing into "Are valve stems pressure retaining components", I would refer you to Sections 5.51 and 6.5. Whether or not the American Petroleum Institute (i.e., API)considers valve stems as pressure controlling or retaining, the International (formerly American) Society of Mechanical Engineers (i.e., ASME) does not consider the stem part of the pressure boundary.

Patricia Lougheed

Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor