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A106-B vs A333-6 piping material
2

A106-B vs A333-6 piping material

A106-B vs A333-6 piping material

(OP)
Hello everyone

in our piping material specification we required the material A106-B SMLS (Impact tested) for a specified class (10 Inch and above)

our contractor proposes the use of the material A333-6 SMLS without impact testing justefying that this is a higher material and doesn't need impact test

what are your thoughts?

RE: A106-B vs A333-6 piping material

For what design temperature?

A333-6 is a low temperature material.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: A106-B vs A333-6 piping material

(OP)
the normal operating temperature is 60 C°

RE: A106-B vs A333-6 piping material

Whats min design temp?

It might be Ok - need to check the particular material specs so a materials engineer would be needed for sign off

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: A106-B vs A333-6 piping material

(OP)
Design Temperature range for offered Pipe material A333-6 SMLS is -21 to 215 Deg. C and the process design temperature requirement is -5 to 90 Deg C.

RE: A106-B vs A333-6 piping material

It still needs impact testing.

This is like saying the steel doesn't need to be tested for SMYS or hardness.

Why the reluctance to do it?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: A106-B vs A333-6 piping material

2
I believe your contractor is stating that impact testing is part of the specification of A-333. Grade 6 is tested at -45C. It can't be called A-333 Gr. 6 without impact testing. Impact testing of A-106B is not mandatory per the specification. Often times A333 Gr. 6 is dual certified to A106B.

RE: A106-B vs A333-6 piping material

(OP)
@ david339933
exactly. the contractor stated that this material is already impact tested.

RE: A106-B vs A333-6 piping material

(OP)
and the reason for deviating from the spec is to save time and avoid procuring and then send it for impact testing

RE: A106-B vs A333-6 piping material

A333-6 and A106-B are the same material, aren't they? The A333 is meant for low temperature service and requires additional impact testing.

RE: A106-B vs A333-6 piping material

Under B31.3 impact testing of A-106B is required based on thickness and MDMT. When impact testing of A-106B is required by Code, it makes perfect sense to substitute A333-6 because it is already impact tested by the manufacturer (the A106 will not be unless a mill order is made). You will no doubt pay more to have the A106 impact tested by the stockiest supplier and there is no guarantee that it will pass.

RE: A106-B vs A333-6 piping material

Simply order A106B Psl 2, depending upon the testing being called out. This is a standard off the shelf product. It is already impact tested at +32 deg F or 0 cent.

Generally we do not charge a premium for PSL 2.

Also A333 grade 6 carries a -50f charpy. Cost will be significantly (+25% $$) higher

Fred
Pipe Seller

Vass Pipe API Line Pipe Industry Leader

RE: A106-B vs A333-6 piping material

From what I’ve been told A106-B doesn’t always meet the criteria for impact testing, so (if that’s true) it’s more than just more expensive.

Huub

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