Max OD and Thikness of a seamless pipe. 3

[BouzidLazhar]

Does the pipeline manufacturing process have a min wall thickness limit to produce a seamless pipe?

 

[BigInch]

There are ID/OD oversize and undersize limits defined in the production specification (API 5L, etc.) which thereby also define the min and max thickness. Check your pipe production spec.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[jte]

I think the OP's question was more related to feasible manufacturing rather than code / standard tolerances. If I understand the question correctly it could be restated as "What's the thinnest pipe which can be drawn seamlessly?"

jt

 

[insult2injury]

Yes, the manufacturer's have a requirement for the maximum ratio of OD to thickness. Cameron used 28:1 and V-M uses 25:1. Depending on the material and actual sizes, there are situations that they may be able to manufacture outside of these ratios, but that needs to be taken on a case-by-case basis with the manufacturer.

I2I

 

[BigInch]

jte, I can see how you thought that. I don't know what he meant, however the absolute thinest wall would be a much thinner than any that would be useful for pressure containment of any kind, so I took the question to the other direction.

Thinking further now, if he's building a pipeline, the pipeline design codes limit Diameter to Wall Thicknesses ratios to about 100, so the thin limit in that case would be 0.01 x OD

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[insult2injury]

Biginch:

Is that 100:1 for seamless pipe? or maybe plate pipe perhaps?

I2I

 

[JStephen]

Just wondering- is steel tubing as used for auto exhausts seamless?

 

[BigInch]

Insult,

All pipe. I thought it was a code requirement, but now I can't find this in a code reference. It may be one of my "rule of thumb codes".

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[BigInch]

Perhaps its in API 5L, but it might be one of those "rule of thumb ""codes""?

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[GregLamberson]

It is a rule of thumb, and a good one. Some company's will put it in their specs, some don't, all should. I was involved with laying some pipe once with a D/t of 112. It was a nightmare, with all of the buckled joints during cold field bending, buckled pipe during lowerin-in, the money the client "saved" in steel was eaten up and then some.

Anything in the 100+ range makes installation a bear.

Greg Lamberson
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[insult2injury]

Who manufactures the seamless pipe with 100:1 ratio? In conversations I've had with Cameron and Vallourec-Mannesmann, the acceptable ratios are much lower. That piping is usually A335 or A106 for power applications, but I thought that it was requirement of the manufacturing process.

I2I

 

[unclesyd]

The Kaiser Rollmet Process produces D/t at a little over 100 with pretty good dimensions and finish.

http://www.kaiserep.com/kaiserep/products/product_Navigator.asp?NavigatorID=173

 

[BouzidLazhar]

We've request two different pipelines:
1- 16" x 0.374" pipe acc. to API 5L X60
2- 20" Sch STD Pipes acc. to ASTM A 53 Gr.B

The manufacture said that the wall thickness is TOO THIN for an execution as SEAMLESS Pipes.

According to API5L, the min Wall thickness for:
- Pipe 16"
is 0.188"
-Pipe 20 "
is 0.219"
that gives a ratio of about 91:1 which meets Biginch's response.

Referring to what all you folks have written previously, I understand that every manufacturer have his own ratio 28:1, 25:1 or maybe 100:1 which leads to say that we can get our above seamless pipe with another manufacture

 

[GregLamberson]

I guess one question is - what is the driver for seamless? Will ERW or DSAW not meet the application?

Both pipes will be 0.375, it doesn't seem like an un-realistic request, I'd try another manufacturer.

Greg Lamberson
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[BigInch]

From Metals International website,

http://klsteel.diytrade.com/sdp/229183/4/cp-1029276.html

1. Hot-finished seamless line pipe

Seamless line pipe is produced to comply with the specifications API 5L, PSL1 and PSL2, ASTM A106 and ASTM A53. Material can also be supplied to the equivalent EN 10208 Part 2. The product range is limited to the sizes given in table 1, with wall thickness to ANSI B36.10.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com