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Number of welds to make pipe from plate.
2

Number of welds to make pipe from plate.

Number of welds to make pipe from plate.

(OP)
Our sub-supplier are making a 52" pipe for us of ASTM A516 material. Do anybody know if there are any restrictions on the number of longitudinal welds to make such a pipe?

Do you know if this is written in ASME B31.3?

Any help is appreciated

RE: Number of welds to make pipe from plate.

5471
Do you mean weld passes per seam or number of seams?

RE: Number of welds to make pipe from plate.

Because the skelp (plate) width is > 13.6 ft, many mills would have to make the pipe with 2 long seams if 40 ft lengths are desired.  

RE: Number of welds to make pipe from plate.

(OP)
Hello metengr.

I was thinking about how many longitudinal seams to weld the pipe together from ASTM A516 plate is allowed according to code.

The Outer diameter is 52" and the thickness is 50 mm.

Best regards,


Torgeir  

www.propure.com
 

RE: Number of welds to make pipe from plate.

B31.3 does not address. The ASTM or API materials specification does. Review A-672 and API 5L.

RE: Number of welds to make pipe from plate.

(OP)
Stanweld,

Thank you for your reply.

The ASTM A672 handles the electric fusion welded pipes.
Are there a standard for saw (sub arc welding)released from ASTM?

Regards,

Torgeir

RE: Number of welds to make pipe from plate.

Yes - A671 and A672.  Submerged arc welding is an electric fusion welding process with filler metal.  The ASTM terminology is archaic and confusing.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/

RE: Number of welds to make pipe from plate.

(OP)
SJones,

Thanks a lot for your helpful reply.

Best regards,

Torgeir

RE: Number of welds to make pipe from plate.

(OP)
SJones,

I have bought and read throug ASTM A672.
The standard does not say anything about number of seams/plates to form a pipe.

Is it then resonable to say it is allowed, since it according to the standard is not disallowed to form a pipe from two plate segments?

Best regards,
Torgeir

RE: Number of welds to make pipe from plate.

Rolled plate and welded pipes are normally fabricated in 10-12 ft long sections (sometimes longer) and then welded together to make 36-48-60 foot long pipes.  so a pipe may be built in several plates.

I hope your fabricator is planning on forming each section in 360 degree portion and not two (2) 180 degree portions.

RE: Number of welds to make pipe from plate.

Does your fabricator have a source of plate long enough for a full circle or are you talking about adding a short piece to a 12' plate to roll the 52" dia?

RE: Number of welds to make pipe from plate.

ASTM A530 and/or ASME B36.10 may dictate the number of seams that are allowed and should be reviewed for confirmation.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/

RE: Number of welds to make pipe from plate.

For making large bore pipe, pipe mills will either make it with two long seam welds 180 degrees apart (for very large diameter pipe, three seams 120 degrees apart may be required) or with single long seam about 10 to 12 ft long as stated by vesselfab.   The short sections can then be made into longer pipe lengths by the mill by circumferential butt welding sections together (refer to 11.3 of A-671 & A-672).    

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