Somewhat off topic regarding outside sprinkler pressure.

[rpm]

I hear you John however explain this example.
Customer buys a pump which needs 1.7bar dynamic to operate, they have 6bar static in the room but the pump will not operate.
I disconnect the pump from the supply in the room and add a dynamic flow tester and see 0.6bar.

 

[johnduffell]

I hear you John however explain this example.
Customer buys a pump which needs 1.7bar dynamic to operate, they have 6bar static in the room but the pump will not operate.
I disconnect the pump from the supply in the room and add a dynamic flow tester and see 0.6bar.

Upstream supply has too great a head loss at that flow rate, ie too high resistance