INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Aeration Piping Question

Aeration Piping Question

(OP)
I'm running a pipeline from blowers with a discharge pressure of 10 psig to an aerated cell roughly 30 ft away. I intend on using carbon steel pipe, but wondering about the schedule. Can schedule 10 CS piping be used?

RE: Aeration Piping Question

It is acceptable but why would you consider this.

Sch 10 may not be as readily available as other pipe. You only need a small quantity. More supports may be required. Service life will also be less (exterior corrosion).

RE: Aeration Piping Question

Also cost to paint the pipe will add to overall cost. Why not use spiral wound stainless steel?

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/

RE: Aeration Piping Question

Stainless steel is what one would normally use.

RE: Aeration Piping Question

(OP)
I would normally use SS, but the contractor has an abundance of carbon steel piping and was wondering if he could use it instead. If I were to use SS, it would be sch 10 as well so using sch 10 CS would not require any additional supports than what is already budgeted/planned.

RE: Aeration Piping Question

Primary considerations in piping materai selection are strength and potential corrosion, thermal effects and environmental factors. Piping materials typically used include carbon steel, stainless stee, ductile iron, FRP, HDPE, and PVC. Use of thin walled pipe requires that it be properly protected from physical damage. Blower discharge may be in excess of 200 degrees so the pipe and supports must be designed accordingly. Because of the large thermal stresses, provision for pipe expansion and contraction are necessary. Blower discharge is often insulated to protect workers from possible burns, help attenuate noise, and keep blower room temperaturs under control.

Blower droplegs are usually PVC or Stainless Steel because of corrosion concerns.

Don't see any benefit in your case for accepting carbon steel. You paid for stainless and a contractor typically will not give you full value back on a change order. Sch 10 is also acceptable for stainless steel because stainless steel will not corrode like carbon steel does. for that reason, the equivalent pipe to sch 10 stainless steel is sch 40 carbon steel.

RE: Aeration Piping Question

You can get SWSS in a thinner wall thicknesses than shcedule 10s and thus reduce you installed costs significantly. You are not going to have great pressures in the piping system. The contractor having lots of carbon steel is like saying he has a stack of cardboard boxes or used panty hose can he use them? Ridiculous concept.

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/

RE: Aeration Piping Question

Agree with the two posts above by bimr and stanier. So what if the contractor has CS pipe laying around. Are you going to redo your heat expansion and insulation requirement calcs? Will the contractor pay for that? What about corrosion concerns?

You (and the owner) have little to gain and-potentially-lots to lose by accepting CS instead of SS w/o making sure that the risks are addressed.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close