cooling water underground piping system

[lganga]

Dear friends
Construction company, has designed all the CWS and CWR as an underground system.
It is a high flow system with CWS in 60" and CWR in 68" and flow, about 30,000 cubic meters per hour.
None pipe supports has been considered . The above ground CWS pumps laid on a concrete slab, connect to a floating underground system. The same happens for any other equipment placed around the plant, where the UnderGround pipe systems connects to AboveGround, like pipe racks, heat exchangers ,vessels,power plant condenser etc.
I have already told the vendor to do stress analysis, considering the flow dynamics in elbows, branches, and the relative displacement due to soil resistance variation because of the ground water levels, along the weather seasons, with weight and dynamic loads acting .
On concrete blocks or any other support, but the soil friction (lime type and clay).
The only standard I have read about, is B31.8 .Does AWWA has some information.
I will appreciate your opinion
Regards
Luis

 

[lganga]

Dear all

That is correct; the place has tropical weather, very rainy in summer, like today, 60mm in 6 hours. The engineering company said they are studying the problem. So there is no freezing condition.By inspection I should, say that the discharge manifold of the cooling water supply should have been underground supported, (30.000 cubic meters per hour flow).The same problem we have with the pipes going to big condensers and connecting the pipe rack and also with big diameter (68”) cw return pipes , back to the cooling tower. I saw the information at ASNSI B31.1,good to read it.