FRP (GRE) Piping - Installation by burying
FRP (GRE) Piping - Installation by burying
(OP)
If FRP pipes are to be buried. The thickness of the FRP pipe is to be determined and recommended by the supplier of the FRP pipes? How is it being determined?
Appreciate if someone can recommend industrial standards which will assist on the above question.
Appreciate if someone can recommend industrial standards which will assist on the above question.





RE: FRP (GRE) Piping - Installation by burying
These standards allow a theortical stiffness/strength of pipe to be matched with the indicated burial conditions.
However, this is theory...a rabbit hole survives without a pipe...ie everything is about soil. Installation, ie back-fill stiffness, compaction and the care taken by the sub-contractor will make or break a buried pipeline.
Hope this helps.
RE: FRP (GRE) Piping - Installation by burying
Also is it a good idea to use nitrogen to test for leaks in the piping or using water to hydrotest the pipe (section by section) is a better choice?
RE: FRP (GRE) Piping - Installation by burying
Always better testing with low compressibility nonflamable liquids. Less dangerous in case of explosion and it makes the test results easier to determine if any pressure variations were due to temperature change or an actual leak.
http://virtualpipeline.spaces.msn.com
RE: FRP (GRE) Piping - Installation by burying
It will give you all the technical information you need to know about burying FRP pipe
RE: FRP (GRE) Piping - Installation by burying
How different is it as compared to steel pipes burying? Are there methods or standards that specify how pipelines should be laid? e.g we put thermal expansion loops on above ground pipelines. But what about underground pipelines esp GRE pipes which have the tendency to expand axially when there is a change in temperature and also when there is flow.
RE: FRP (GRE) Piping - Installation by burying
Part of the pipe expansion is taken up through friction between the pipe and the soil, therefore if the installation is poor the pipe will be free to transmit the axial loads. It is also worth remembering that with an FRP pipe as the pressure increases there is a reduction in length due to poissons ratio effect.
RE: FRP (GRE) Piping - Installation by burying
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: FRP (GRE) Piping - Installation by burying
GRP has a low level of strin tolerance. Thus the design of a pipe/soil structure require more care than for steel pipes.
Check out AS 2566.1 & .2 Buried Flexible Pipeline Design & Installation from Standards Australia.
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: FRP (GRE) Piping - Installation by burying
I happened to notice just today at http://