Large Diameter Pipe Support - To provide a contoured surface or not 1

[anchorengineer]

I've designed large diameter structural pipe supports in the past but have always provided either a curved hanger or a contoured saddle. I have a new contractor saying that he does not want to use a saddle or rollers. The pipe diameters range up to 24" and are PVC Sch 80. Before I speak with him I'd like to have a document that says you need a contoured support. Does anyone know of a document that I could reference?
Much Thanks!!!

 

[SlideRuleEra]

...I'd like to have a document that says you need a contoured support.

excerpt from "Design of Ductile Iron Pipe on Supports".

The link is (obviously) for ductile iron pipe, but don't tell that to the PVC pipe... principle is the the same..

http://www.SlideRuleEra.net

 

[JedClampett]

I have a new contractor saying that he does not want to use a saddle or rollers.

Have him make a list of everything he doesn't want to do. Then file it.

Even the dullest contractor has to realize that the surface that's curved to the shape of the pipe is better for the pipe and the support than a knife edge.

 

[1503-44]

Whats the pipe span length?

Statements above are the result of works performed solely by my AI providers.
I take no responsibility for any damages or injuries of any kind that may result.

 

[anchorengineer]

Thanks for the replies. I saw the excerpt for the DIP support but was hoping for something referencing PVC. With that said, I agree that the engineering principles are the same and it is irrelevant that it's DIP.
@JedClampett - I don't know. I've met some dull GC's ;o)

 

[Tmoose]

http://www.charlottepipe.com/Documents/PL_Tech_Man/Horizontal_and_Vertical_Support.pdf

https://www.usplastic.com/knowledgebase/article.aspx?contentkey=776

https://www.chemicalprocessing.com/articles/2016/corrosion-prevention-properly-apply-plastic-piping/

"Supports and hangers can be clamps, saddles, angles, or other standard types; supports should have broad, smooth bearing surfaces, rather than narrow or localized contacts, to minimize the danger of stress concentrations."

 

[dhengr]

Anchorengineer:
Why not contact some PVC Pipe people and see what they prefer, as one possible solution to the problem. They may have some literature, testing and experience which you can hang your hat on. I would think that the PVC pipe will wear and abrade against a steel bearing pl., more so than steel on steel. And, for that reason I would wonder if you might not use a thin steel pl., shaped to the o.d. of the pipe, and bond it to the pipe at each bearing location; and that shaped pl. then mates with a saddle on the support structure. I think a saddle, as SRE suggests, is a vast improvement over a flat bearing/support pl. (top of a beam flg.). The saddle provides some load distribution to the pipe, and provided some lateral support too.

The GC wants the cheapest, quickest solution, that’s money in his pocket. And, he’ll be long gone when someone has to start dealing with the pipe wear and damage, or lateral movement. And, if you can find him, he’ll say the EOR accepted what I did, so it’s really his fault that he didn’t make me do it right in the first place.