UG HDPE pipe- thrust block req'd ?
UG HDPE pipe- thrust block req'd ?
(OP)
Kidnly advise your educated opinion or advise a design manual that would apply to this case:
1500 ft of 12" NPS HDPE pipe, 2 ft of cover, installed in a soil of normal soil temp of 55 F. The pipe will accept blowdown slurrry water from a FGD system, at 120 F, cycled twice per day. Engineer of record not sure if any thrust blocks are required. Is there a AWWA design code that can be used to govern this decision? AWWA M55 ?
Will this pipelook like a half submerged dragon after 10 cycles?
1500 ft of 12" NPS HDPE pipe, 2 ft of cover, installed in a soil of normal soil temp of 55 F. The pipe will accept blowdown slurrry water from a FGD system, at 120 F, cycled twice per day. Engineer of record not sure if any thrust blocks are required. Is there a AWWA design code that can be used to govern this decision? AWWA M55 ?
Will this pipelook like a half submerged dragon after 10 cycles?





RE: UG HDPE pipe- thrust block req'd ?
RE: UG HDPE pipe- thrust block req'd ?
RE: UG HDPE pipe- thrust block req'd ?
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RE: UG HDPE pipe- thrust block req'd ?
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: UG HDPE pipe- thrust block req'd ?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: UG HDPE pipe- thrust block req'd ?
Stephen Argles
Land & Marine
www.landandmarine.com
RE: UG HDPE pipe- thrust block req'd ?
There is a weld derating factor of 0.8 for the tees if the welding is carried out by a qualified welder.
A hydro test isnt necessarily going to prove the integrity of the fitting.
I have seen large tees concrete encased after a leak or just in case. In any event the concrete block wasnt for thrust but to prevent further damage to the tee and to stop the leak.
If you are going to encase in concrete there is a need to wrap the tee with a rubber material (wet suit type).
As for thrust, if the tee were aboveground would the mechanical engineer concrete encase it? No, of course not. This is the way I explain the concept to civil engineers who dont grasp the idea that they need everything coloured "grey".
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au