@ racookpe
The issue is slightly complicated. The suction line are rated the same as the discharge line. Due to a manufacturing error the suction chamber of the positive displacement pump (Parallel operation: 2 pumps in use and 1 standby) may not now be fit for the intended design pressure...
@ LittleInch
At what point you change the design pressure accross a pump is dependant on your system, but commonly if you have an inlet isolation valve, the rating of this is the same as the discharge side because if the outlet valve is opened before the inlet valve and pump is in operation...
