ASME Fittings 1

WPB = Wrought Product Grade B
WPC = Wrought product Grade C

Deduction only......never saw it written anywhere....I know the grades are correct.

ASME B16.11 chapter 4 under marking references the ASTM fitting specification material identification such as "WP__". The previous paragraph lists the specifications such as A 234, A 403, A 420, or B 366, or the appropriate
ASTM Forging Specifications A 105, A 182, A 350, B 160, B 164, or other applicable forging Specification of Table 1, ASME B16.34 ...

A 105 product marking states "Forgings repaired by welding shall be marked with the letter “W” following this specification number."

I still don't see the answer to your question.

WPB - welded pipe, grade B (specific carbon content and strength level)
WPC - welded pipe, grade C (higher carbon content and strength level)

Source; CASTI Guidebook to ASME Section II -2000 Materials Index

Metengr,
I "used" to say welded pipe grade B and C until someone asked me...Where is the buttweld in these seamless fittings? That question caused me to rethink and consider these fittings as wrought products. I don't care what anybody says, I think it is misleading. Especially to those International Code users where these questions come from.


There are three kinds of people in this world; those who can count and those who can't.

The operative word is "W" for weldable material. I should have probably stated as such, however the definition is what it is, regardless of what you or I think it should be.

I think the ASME still call it wrough product, sec II
eng. firms call them welded pipe for some reason.

Here is a grade I am not familiar with but is mentioned along with grades WPB and WPC in the SA-234 Specification in Section II Part A.

What is WPR?

It is not in B31.1, not permitted in Sections I and III from Table1A of Sec II Part D. But is allowed up to 100 degrees F for Section VIII Div 1 up to 100 degrees.


just curious.....since we are on the subject....


There are three kinds of people in this world; those who can count and those who can't.

I believe the letter R stands for a specific grade of alloy steel chemical composition and strength that was assigned this designator apart from other grades. The R is like other designators, A, B, C ....