Schedule 40 Steel Pipe...axial capacity??

[shuff213]

I have a contractor looking to use 2" dia. schedule 40 pipe for a short post in a crawlspace. I was not able to find any tables online regarding allowable loads for said pipe. Any ideas where to look? Thank you.

 

[Ron]

Calculate it. You know the dimensions. It will act as a column, so check compression and buckling. Compare those to allowable stress values in AISC or other applicable codes.

In general, a short, 2" dia. sched. 40 pipe will have a relatively high capacity. Also check to make sure the bearing plates top and bottom do not overstress the materials they contact....and yes, you must have bearing plates.

 

[aswierski]

What's the length of the pipe? How will it be connected? Material?

 

[shuff213]

Steel pipe Schedule 40 was proposed, and the length is approximately 5'-6" (unbraced). The loading will be approximately 1500 lbs (unfactored).

 

[akastud]

Schedule 40 = Standard Steel Pipe (designated Pipe2STD)

 

[PT999]

You'll be OK as 1500 lbs is very little load for 5.5 ft length.

 

[racookpe1978]

Buckling for 5'6 at 1500 lbs? I'd recommend a 4 inch sch 40 to get the bigger diameter. For 2 inch - my gut says you'd need a heavier wall.

Hardware stores have a "standard" adjustable screw-thread cap for 4 inch diameter pipes. Hint, hint. (I use 4 inch pipes for my basement supports at 7 foot length.)

 

[Ron]

Nope...buckling load (Pc) for 2" pipe 66" long is over 40,000 lb. 1500 lb not a problem. kl/r only 83.9

 

[racookpe1978]

Thank you for checking - No books available right now.

Robt

 

[dhengr]

Wow, I’d want to think a little more about recommending a 40kip load on a 2" schedule 40 piece of pipe 66" long and of a uncertain spec. Most columns that slender don’t fair very well at 37.2ksi.

Robt>> Look back at the thread on 1" foam insulation.

 

[racookpe1978]

Will do. Am hung up here in Spain, finishing a power plant generator job, and have not been able to print it yet.

Again - thank you for your help!
Robt

 

[BAretired]

Schedule 40 pipe is not a structural steel. Its yield is substantially below normal structural steels. Depending on the grade, it could be as low as 25 ksi or as high as 35 ksi.

Notwithstanding, a concentric load of 1500 lbs. should be easily handled by a 2" pipe over a length of 5'-6".

BA