Steel pipe supports

[angusmoore]

Can someone give me a simple formula to calculate the amount of sag in a pipeline between to suports

 

[bimr]

Not sure there is a simple formula.

Typically, a deflection of 2.5 mm (0.1 in) is allowed, provided that the maximum pipe stress is limited to 10.3 MPa (1,500 psi) or allowable design stress divided by a safety factor of
415, whichever is less.

See page 3-7 in the following document for the formula

http://publications.usace.army.mil/...10-1-4008_sec/EM_1110-1-4008_Sections/c-3.pdf

Here is a link to an additional source. Note that formula is shown in the pdf's linked on the bottom of the page.

http://www.wermac.org/steel/pipesupports_spacing.html

 

[msquared48]

Depending on the end restraint conditions, the deflection will vary between the simple support deflection of 5wl^4/384EI, to the fixed end deflection of wl^4/384EI, with "I" being the the I of the pipe, and "E" the modulus of elasticity.

That's about as "simple" as you can get.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[dik]

I don't know if it's still available, but "Tubular Steel Structures" by the Lincoln Welding Foundation has a bit of a blurb on underground and underwater piplines that has deflection information in the chapters.

Dik

 

[msquared48]

I assumed that this was an above ground application...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com