Spiral weld versus longitudinal and circumferential weld 1

[GD2]

Folks,

A customer specified a 64 in SS 304 pipe spiral welded. The manufacturer manufactured the pipe with midsection longitudinal seam welded and two end sections with circumferential welds.

Should the customer accept or reject the pipe?

In terms of spiral weld pipes, what is the usual RT type, extent and joint efficiency considered?

GDD
Canada

 

[weldstan]

If the manufacturer could not produce spiral welded pipe, the customer should not have given the bid to it.

 

[david339933]

Take a look at Table 302.3.4 B31.3

 

[MJCronin]

This is the problem with incompetent clients defining what they want using words, instead of using specific Standards.

This only tells me that your customer has zero background with Process Piping system design ...

Seamed/seamless construction is typically more robust that spiral-welded pipe and therefore more desirable.

The inferior Spiral welded pipe is offered in the marketplace only because the seamed/seamless construction cannot be done for larger pipe diameters

The "common as dirt" A53-Grade B carbon steel pipe is defined by ASTM/ASME material standards ... A53-B is an inexpensive seamed or seamless piping commonly used in industry. It is NOT a spiral wound construction

However, spiral-welded steel pipe is available to 144", and fabricated in accordance with the requirements of AWWA C200, ASTM A139 and ASTM A252 Standards... Is this what he wants ? ... Does he have any of these standards at all ?

MJCronin
Sr. Process Engineer

 

[WKTaylor]

GD2...
"A customer specified a 64 in SS 304 pipe spiral welded...." is a very poor definition of Your issue...
Is the pipe 64.0-Dia [ID or OD] X 'unspecified length'...? Or is the pipe an 'unspecified diameter' X 64.0-long???

David3...
Be very careful.... 'B31.3' is an obscure spec definition... for dummies like me, ASME B31.3 is crystal clear.

Spiral weld pipe is made from a sheet of flat strip x-wide X very long strip... and would be useful for making larger diameter and/or tapered-diameter lengths of pipe that are usually structural. Very long full penetration butt welds have to be protected by inert gas on both sides and are typically vulnerable to chemical/corrosive attack or leaks at weld defects... etc.

As stated above, seamless pipe will be least vulnerable to chemical/corrosion attack... but I am sure there are seamless diameter limitations in SStl for practical reasons, IE: 64-in Dia would be a challenge.

A lot of aerospace pipe/tubing [small Dias, long-lengths] can be made seamless/drawn... or seam-welded-lengthwise, then drawn enlarged/smooth.

See how being specific in Your issue[Q] and answer[A] can make a difference to a broader participation?

Is the customer most concerned about performance or cost or...?? High pressure, low pressure? Fluids or gases or solids in fluids or gas 'slurry'. Are there corrosives, erosive-particles, or is everything 100% inert, etc?

Regards, Wil Taylor
o Trust - But Verify!
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", HBA forum]
o Only fools and charlatans know everything and understand everything." -Anton Chekhov

 

[dik]

A really interesting problem... the fabricator has failed in his contractual obligations and the client has received a better product. It should be a simple matter of discussing the product.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[EdStainless]

The real question should be what specification was the original order using, and does the alternate product comply with that specification. If it meets the specification and passed the required NDT then it is product and the how is not relevant.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[0707]

If the manufacturer couldn´t produce what the costumer asked for should say it before.

 

[Dhurjati Sen]

Guess you have received a better pipe than actually ordered.

But why somebody would do you such a favour?

The item was probably lying with them for a long time, they needed to get rid of it. Luckily, the dimensions matched and they rushed the order.

What do you do?
Check MTC.
Match heat number with the pipe.
Check the dimensions.
Carry out visual inspection.
Spend some money and carry out PMI. You can subsequently deduct it from the supplier stating that they did not supply as per order.

DHURJATI SEN
Kolkata, India