RealKayfactor
Mechanical
- Oct 16, 2019
- 3
Hi Guys,
This has been bothering me a lot recently. It's either I am just missing a very simple method or its much more complex.
NFPA13 pipework schedule for OH shows 275 sprinklers on a 6in pipe is the maximum otherwise use hydraulic calculation to size pipework.
I definitely know how to do the calc for the area of operation, using the density curve the move sprinklers you could have flowing in the area of operation is 50, so technically you would only ever need to satisfy the pipe sizes can serve your area of operation.
But why is there then a limitation on how many sprinklers a DN150 pipe can serve? As long as you can prove the main pipe can serve your area of operation, why does it mater if there are 275 sprinklers on the DN150 main or 500 ?
Second question - if it does matter (obviously it does) everywhere it says show by hydraulic calc, what is this calc? What do I need to calculate exactly ?
Please and thank you
This has been bothering me a lot recently. It's either I am just missing a very simple method or its much more complex.
NFPA13 pipework schedule for OH shows 275 sprinklers on a 6in pipe is the maximum otherwise use hydraulic calculation to size pipework.
I definitely know how to do the calc for the area of operation, using the density curve the move sprinklers you could have flowing in the area of operation is 50, so technically you would only ever need to satisfy the pipe sizes can serve your area of operation.
But why is there then a limitation on how many sprinklers a DN150 pipe can serve? As long as you can prove the main pipe can serve your area of operation, why does it mater if there are 275 sprinklers on the DN150 main or 500 ?
Second question - if it does matter (obviously it does) everywhere it says show by hydraulic calc, what is this calc? What do I need to calculate exactly ?
Please and thank you