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Old Pipe Spec (Canada / 1960)

Old Pipe Spec (Canada / 1960)

Old Pipe Spec (Canada / 1960)

(OP)
Hi everyone,

I'm looking for any information / interpretations people may have for a NPS-12 Steel Gas pipeline installed in Ottawa, Canada in 1965.

According to the original BOM, it is listed as:

PIPE STEEL (C&W) WALL THICKNESS .375

Any idea of what the C&W stands for?  I thought maybe the "&" was a typo and they meant CW, but all documents from the old project file state "C&W".

I'm trying to determine if this is old Grade A (~207 MPa ?) pipe.

thanks,
Dave

RE: Old Pipe Spec (Canada / 1960)

C&W = Coat & Wrap, This is pipe that was purchased for underground installation and therefore was spray Coated with hot liquid "Tar" and then wrapped with "Tar-Paper" material to lessen the possibility of corrosion..

RE: Old Pipe Spec (Canada / 1960)

DavetheGasPipe:

I think pennpipers's response is probably correct.

Be cautious if this is pipe in Canada; I think the best SMYS that you can claim, without cutting out samples and testing, for pipe of unknown origin is 172 MPa.

Regards,

SNORGY.

RE: Old Pipe Spec (Canada / 1960)

(OP)
Thanks for the quick reply guys- much appreciated!

RE: Old Pipe Spec (Canada / 1960)

I'm faced with a similar problem. Mine says "welded steel pipe" early 1950's. There is more information on the corrosion protection on mine. I'm faced with coal tar and an asbestos wrap.

RE: Old Pipe Spec (Canada / 1960)

(OP)
Hi everyone,

In speaking with one of our 'older' Engineers (I use the term older as very much a compliment!)

The CSA Z662 Gas code replaced the older Z184 which came into effect in the mid sixties.  Prior to the Z184, the B31.8 would have been the design code and the CSA Z184 would have been heavily based on the B31.8.  The B31.8 would have referenced the API 5L code.

The two main types of pipe used at the time (1950/1960s) would have been either Grade A or B (30,000 psi/Gr 207 or 36,000 psi/Gr 241).

Any fittings at the time would most likely have been Gr 241 with standard wall thicknesses.

Please comment/verify/add to the above if needed.  I thought I'd share the little bit of history.
 

RE: Old Pipe Spec (Canada / 1960)

That is true to my understanding, although Z 183/184 were widely used in the eighties when I broke into the business.

That said...

Be mindful of Clause 5.6.4 In CSA Z662-07 (although 2010 is in effect now...)

5.6.4
Steel pipe of unknown origin may be reused, provided that
(a) each pipe is inspected, tested, and confirmed to be in conformance with a standard or specification
acceptable under this Standard; or
(b) it is intended for an application not requiring proven notch toughness properties, and it is designated
to have a specified minimum yield strength not exceeding 172 MPa and a joint factor not exceeding
0.60.

Regards,

SNORGY.

RE: Old Pipe Spec (Canada / 1960)

(OP)
SNORGY is absolutely correct.

Where this matters so much (especially for the folks on the distribution side of things) is in determining % SYMS that lines are operating at.

Especially with the fall-out from San Bruno, I believe it won't be long until all lines operating in the 15-20% SMYS range will need to be internally inspected.  Therefore, any replacement and relocation projects must be designed with these requirements in mind.

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