installing buried chilled water pre insulated piping
installing buried chilled water pre insulated piping
(OP)
hi guys'
we are new at installing directly buried (in earth) chilled water district cooling piping .Our application is pre insulated black steel piping with welded joints.We had carried out stress analysis through a certified consultant ,software used was Ceasar-II .Result was cancellation of the design intent of thrust blocks & flexible joints on piping while introduction of concrete anchor points (mass concrete)at very few locations(at entry point of piping to buildings),further the piping was allowed to move with polystyrene wraps at changes in direction of pipes while remaining buried.
Is this feasible in normal practices?
The design consulant for the piping is very skeptical of the proposal and objected to the design of the concrete anchor blocks .
Please help ,if we have cerified concrete anchor block design procedures for buried steel piping.
Working Pressure in piping is very minimal 4.6 bar ,application is in the middle east area.Piping is buried with normal dune sand over it.
we are new at installing directly buried (in earth) chilled water district cooling piping .Our application is pre insulated black steel piping with welded joints.We had carried out stress analysis through a certified consultant ,software used was Ceasar-II .Result was cancellation of the design intent of thrust blocks & flexible joints on piping while introduction of concrete anchor points (mass concrete)at very few locations(at entry point of piping to buildings),further the piping was allowed to move with polystyrene wraps at changes in direction of pipes while remaining buried.
Is this feasible in normal practices?
The design consulant for the piping is very skeptical of the proposal and objected to the design of the concrete anchor blocks .
Please help ,if we have cerified concrete anchor block design procedures for buried steel piping.
Working Pressure in piping is very minimal 4.6 bar ,application is in the middle east area.Piping is buried with normal dune sand over it.





RE: installing buried chilled water pre insulated piping
Your commodity is chilled water. You did not say how chilled is chilled and you did not give any indication of the ambient temp. at installation so we are at a loss to help. As you and others know, as the pipe gets cold (or colder than it's installed temp.) it is going to shrink. The piping system will shrink away from your thrust blocks. So why have them?
Give us more data.
RE: installing buried chilled water pre insulated piping
RE: installing buried chilled water pre insulated piping
Pre insulated steel pipe can be a problem if ground water is present. Differential movement of the ineer pipe compared to the insulation could break the vapour barrier. Once water enters the insulation pipe corrosion will quickly follow.
Modern materials such as Tyco's K Flo overcome this problem by providing an ABS pressure pipe, pre insulated with expanded foam and an outer ABS sheath. No amount of water will corrode the pipe.
ht
This ABS pipe had been used in Australia and SE Asia for over thirty years. It is good to -40C and is extremely tough. It is used below and aboveground for pressure applications in all manner if industries. The lower modulus also helps reduce pressure transients compared to steel and GRP.