11 Feb 08 14:23
The structural guys probably already do this part,
loads due to friction in any direction on non-anchored and non-guided pipes attached to supporting members are the weight * friction factor (usually considered to be 0.3)
(you should use as few as possible anchors and guides, NOT one at every support please) That means ONLY where you need them for stress control purposes. Its entirely normal to have some snaking, if its limited enough that adjoining pipes arn't touched.
The structural guys will take those loads, if they don't already know them (they usually just put about 40 psf on piperack spans and figure the uniformly distributed load from that to the beams), and figure and design for the resulting deflections.
The structural guys will not know any of the guided and anchor loads as those depend on your pipe config, op press and temps. You must advise them if any exceed the normal frictional loads W * f.
Pipes are space frames, so find a table of typical pipe configurations and resulting loads from temp change and calculate those yourself, or learn how to run Caesar, Triflex, some pipe stress program if you can't figure out the space frame formulas.
Most of the time you should take the entire anchor force without regard to what's happening on the other side. It will generally be conservative. Most of the time, if there is some counteracting force on the other side, you don't need the anchor located where you've got it. Why would you need it if forces are pretty much balanced, as there is no big differential to transfer to the anchor and underlying support? But, you as the stress engineer must know when and if it is conservative or not to do that. If you can't tell, run Caesar.
"We can't solve problems by using the same kind of thinking we used when we created them." -Albert Einstein