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What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?
2

What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

(OP)
Dear alls,

I have to buy Duplex Pipes for Gas/Air service With Diam Range: 2" - 16".
I think Sch 10 is cheaper than Sch 5 (My boss wants to buy Sch 5).

What do you think ?

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

Why would you think thicker pipe (sch 10) would be cheaper than thinner pipe (sch 5)? So long as sch 5 can handle your pressure and other forces then why not choose the thinner pipe?

Just curious.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

Same reason 1" plate might be cheaper than 0.90" plate: someone might have a bunch of it on the shelf.

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

But he just "thinks" its going to be cheaper, not that he knows and in a big size range. You may find the odd few lengths our one of the sizes, but its not common unless you are using a very rare size and in general the less of something the less it will cost.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

A quick Google search is finding Sch 10/20/40/80 stock. Looks like Sch 5 may be special order, at least from some vendors.

However: CALL SOME SUPPLIERS. It will get you current pricing and availability.

Something to get you started:

http://bit.ly/15nQ9tj

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

If they are buying a gazillion meters of a size/thickness, a special mill run may save a ton of money.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

Another factor that you and your boss may not have considered is the additional cost of pipe supports on thin walled piping.

IMHO, the schedule 5S piping will require much more expensive pipe suppports than the 10S..... This will be especially true with large diameter (heavy support loads) and higher temperature duplex piping.

Competent pipe-support designers know that many 5S supports will require pads to distibute sysem loads.

Heavily loaded riser supports on piping systems may require full encirclement reinforcement.

Elbow trunions are, IMHO impossible

Here is a fun document.......

http://www.osti.gov/bridge/servlets/purl/6441473-c...

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

Re-read the OP and it says duplex for gas / air service. Why??

Duplex is usually only required for highly corrosive fluids and not what sounds like utility piping. I fully agree that you can go too thin sometimes and just because a material seems to be avilable, doen't mean that overall it will be the cheapest - just makes it difficult to justify some times which is what I think th eOP is looking for. Still not clear why he's chosen duplex though...

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

(OP)
LittleInch, thank for your points of view :
Answering your Questions; The process involves NaOH , N, NaSH and other corrosive fluids. Besides the temperature ranges is: 113° F - 230° F, that's why we have to ues Duplex instead of Reinforced Fiber Glass.
I don't have the certainty, but I think 5S is not Std as other Schedules as TomDOT mentioned above.

Obviously the only way to know is getting some Quotes, but the vendors responses likely takes time and standards desviation..etc that's why I ask for some help in this issue.

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

If they want your business, they will reply. Now, why did you wait one more day to ask?

RE: What is Cheaper for Duplex 2205 Pipe, Sch. 5 or Sch 10 ?

5S is a rarely found schedule. Unless you're looking for a mill run, 10S is probably going to be all you can find.

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