Hi Guys.
I have a LT Surge Drum with 2 CNF 40 Liquid Ammonia Pumps.

Both Pumps have identical valves and pipework with "Hermetic CFR regulators" after the pumps.

These from the little I have learnt so far regulate the flow of liquid from the pump??

According to the site PID they also are a non return valve.
Which makes sense, however pump 1 when at rest shows the pump suction and discharge pressures in equilibrium (Both the same!).

Pump 1 runs fine. Displaying Pump pressure of approx. 1.98 Bar.

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Pump 2 pulls high Amps and eventually trips on the Low pump diff switch. Also it's measured Pump pressure displays approx. 1.46 Bar.

When referring to the manual I have it suggests that the pump might be running on 2 phases!

I will check that tomorrow when I am scheduled to return to investigate the pump issues.
I am pretty sure I have actually checked this before and found no issue!
But Hey I will check it again tomorrow.

Anyone got any ideas?
Thanks Grizzly