Optimum Wall thickness selection

[mectub]

Could you help me to decide which wall thickness is the more appropriate from different point of view (economic, comercial availability, flexibility) for a pipezise 30", calculated thck 0.100". Any one knows prices for pipes, i would like to evaluate cost to make a decision.

Thanks in advance

 

[zdas04]

You might want to provide a bit more information. For example a 30-inch "Pipe" designed for zero psig could easily be zero inches thick since we don't know what other parameters are of interest to you.

David

 

[mectub]

I already have the calculated thickness 0.100", what i need is any advise about the final selection of the thickness, from ASME B36.10. Is better to select 0.250" or 0.375" or between, and why?, because the first is a more economic choice or the second because is more easy to find in market (comercial availability).

 

[vpl]

I would hazard to guess that anything that is commercially available is going to be the more economic choice then anything that needs to be specially made. I don't know what you mean about "flexible."

The question on pipe prices comes up periodically. You might do a Google search on the forum to find one of the past threads.

Patricia Lougheed

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

 

[BigInch]

If you don't need enough to make a special mill run (500 tons or so), buy a standard size.

P.S. That 30/0.1 D/t ratio is too high anyway.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[mectub]

All the wall thickness in table 1, B36.10M, are not commonly fabricated ("special mill run") or just a few of them like standard size ("buy a standard size")?. Can i find in the market any B36.10 size?. If you calculate a size for 30-inch Pipe below 0.250", you go to standard size as your final selection. Sorry if i dont make myself clear.

 

[mectub]

By standard size i mean 0.375" (Identification Std.

 

[BigInch]

Pipe can be specially ordered in most any wall thickness. Its just expensive to do that, if you only need a small quantity.

If you calculate 0.1 inch wall thickness is needed and you only need a few joints of pipe, you'll probably be forced by economics to order 0.250" wall off the shelf, or the next thicker wall, etc. until you find something that meets your delivery schedule requirements.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/