Aquamine PVC Pipe - Thrust Block?
Aquamine PVC Pipe - Thrust Block?
(OP)
For those not familiar with it, aquamine pipe is a pvc piping system that is similiar to victualic for iron pipe. It has couplings that use o-rings and plastic splines that run between a groove in the pipe and a groove in the coupling, essentially locking it together. However, many of the factory fittings are standard spears schedule 80 pvc fittings with pre grooved aquamine stubbs socket welded in place. So, there is a combination of PVC socket weld joints and the aquamine spline/groove joint.
The line is 6" and operates up to 100psig
So, for a shallow, underground installation (just at 2' below grade) are thrust blocks recommmended at 45 sweeps? At 90 elbows? At Tees? At Wyes?
I have heard arguments both for thrust blocks and against thrust blocks. Some have said that thrust blocks will do more harm than good. Is this possible?
Any insight, rational or opinion is appreciated.
Thanks,
The line is 6" and operates up to 100psig
So, for a shallow, underground installation (just at 2' below grade) are thrust blocks recommmended at 45 sweeps? At 90 elbows? At Tees? At Wyes?
I have heard arguments both for thrust blocks and against thrust blocks. Some have said that thrust blocks will do more harm than good. Is this possible?
Any insight, rational or opinion is appreciated.
Thanks,





RE: Aquamine PVC Pipe - Thrust Block?
Civil engineers rarely can get their head around the fact that pipes with rubeer ring joints dont need thrust blocks. I put it down to their love of pouring concrete to solve the world 's solutions.
Mechanical engineers build weapons civil engineers build targets.
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: Aquamine PVC Pipe - Thrust Block?
RE: Aquamine PVC Pipe - Thrust Block?
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RE: Aquamine PVC Pipe - Thrust Block?
Please explain how you can afford not to at change in direction of the fluid flow.
RE: Aquamine PVC Pipe - Thrust Block?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Aquamine PVC Pipe - Thrust Block?
However, when constructing underground pressure pipes in street right of ways - movement of any kind cannot be tolerated as this becomes an expensive proposition to continually replace damaged pavement because of settlement, leakage or other problems caused by pipe which is "moving". The trend in this area is to backfill with concrete enriched slurry, aka "lean concrete", CLSM or "flowable fill". This forms a complete concrete encasement of the entire pipeline, greatly reducing the chance of settlement or movement. Where thrust needs to be restrained, thrust blocks are being used less and less in favor of other types of thrust restraint on the pipe joints.
RE: Aquamine PVC Pipe - Thrust Block?
The Virginia Recycle Water Scheme has 200km of up to DN800 AS 3518 ABS pipe with chemically welded joints and no thrust blocks.
Again I say if a piping system can be installed above ground without thrust blocks then it is perfectly happy below ground.
As for failures below ground in road easements then perhaps a better pipe system should be used rather than PVC.
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: Aquamine PVC Pipe - Thrust Block?
I certainly don't believe that pvc installed in roadways is not acceptable. Many agencies allow it. Although, at least in this area it is generally limited to private streets or low volume local streets, not arterials. But any type of pipe installation that exhibits movement as might be expected without thrust restraint may eventually cause failure of the overlying pavement.
RE: Aquamine PVC Pipe - Thrust Block?
I am not aware of any study or research material that could provide me with enough confidence on the assumed parameters for friction factors for varying soil characteristics and pipeline material or coating (in particular on high pressure applications). And what is the appropriate safety factor (ignorance factor) that should be used.
Would appreciate if anyone could enlighted me on that.
cvg, any other cheaper and more effective method than concrete thrust blocks?
RE: Aquamine PVC Pipe - Thrust Block?
do a search using restrained joint and you will find many methods and discussion of pros and cons
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http://www.ebaa.com/pdf/pdf/PD-1.pd
RE: Aquamine PVC Pipe - Thrust Block?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com