Converting pressure loss from Pipe Pressure Test ...

[caityann]

Hello,
I recently did a pressure test on a 24" pipe, 3800 feet long, using potable water. the pipe lost 4 psi, at a test pressure of 185 psi. I need to know if this allowable, however the chart gives the allowable pressure drop in GPH. Help please!!!!

[admin]

For your values I get velocity of 1.7 m/s which is ok for water, and it would be ok also if you are in the range of 2 m/s velocity.
More important is that the 4 psi pressure drop does not create cavitation and that there is sufficient pressure for the end user.