Thrust Block for 2" Dia PVC Pipe (Glued Joints)

[Trillers]

Two Questions Here:

1)Are thrust blocks required for Sch 80 2" Dia PVC pipe in good soil (bearing pressure is at least 1,500 PSF)? The pipe will be pressurized to at least 100 psi wuth solvent-glued joints.
I have seen some tables showing thrust block sizes for 2" PVC pipe, but a client has asked us to compute whether the pipe against the soil is adequate for thrust restraint.
My reading of AWWA C605 is that it applies only to push on joints, and am I correct in my understanding that solvent glued joints are mechanical joints?
2) If I am to analyze the bearing adequacy of just the pipe against soil how would I compute the actual bearing area of the pipe against the soil? In other words for a 2" pipe, how many square feet of the face per lineal inch or foot would be the resisting surface?

 

[BigInch]

Don't need anchors for glued, welded, or fused joints. Butting up PVC to an anchor of any type is likely to do more harm than good.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[bimr]

PVC solvent welded joints are restrained joints. Restrained joints do not require thrust blocking. Flexible joints require thrust blocking.

Not sure what you application is but it is generally considered to be best practice to use flexible piping joints for underground piping.

 

[Trillers]

Thanks for the info - this is a to be a 400 LF waterline with 12 Ea 3/4" laterals for hose bibbs. We recommended restrained (glued)joints without thrust blocks, but the client wants glued joints WITH thrust blocks.

Appreciate your input - do you have a good site or source for flexible piping joints?

 

[stanier]

If the pipe was up in the air, in a plant, would you have thrust blocks? Of course you would not. Explain this to your client and see if he has a a rational explanation as to why aboveground pipe does not need thrust blocks. Do the piping around a domestic swimming pool have thrust blocks ? No!

Try the PVC handbook by Bell for a reference. i think it is freeley available on the Internet.

“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King

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