Calculation question
Calculation question
(OP)
Not hydraulics expert
First set of calcs show system pressure of 50 with system demand of 487 gpm
Resubmit added backflow with fixed 3 pdi loss and calcs changed to:
System pressure of 53 and system demand of 483
Do the calcs jive , do I need to worry abut them or good to go??
Thanks
First set of calcs show system pressure of 50 with system demand of 487 gpm
Resubmit added backflow with fixed 3 pdi loss and calcs changed to:
System pressure of 53 and system demand of 483
Do the calcs jive , do I need to worry abut them or good to go??
Thanks





RE: Calculation question
In short something changed in addition to just adding the backflow assembly.
RE: Calculation question
1.38. To 1.44
RE: Calculation question
1.44 is ID for 1 1/4" Sch. 10 steel
Seems like they plan to throw a stick of lightwall in to make up some pressure loss from the backflow. Sch. 10 is allowed by NFPA 13, but possibly not by the front end spec. Good to double check.
RE: Calculation question
Already an interesting retrofit
Now have to look at each piece of pipe on inspection