I assume the pump is a centrifugal, right? Can you turn gridlines on the major x and y values and repost? Thx!
Yes, it's a centrifugal pump. I've attached a copy of the graph with gridlines.
You need to show more of the system. And a pump curve with some data. I don't understand the pressures that you display.
Bobby
Unfortunately I don't have most information about the system handy, without visually inspecting or asking around for it. I'm only responsible for the instrumentation and controls (including these valves)
Could it be you are aspirating air? The flow pattern makes me think of a vacuum leak.
The vacuum is logged at several points in the system. It seems to remain steady, and this is a new system that was thorougly inspected for leaks a few weeks ago (but a leak might be possible).
Hi,
How is managed the level in the tank feeding the pump?
How do you mitigate the risk to generate a vortex ?
What about cavitation or vapor lock?
Breizh
The level is managed manually by operators. It's a large tank, the level remains steady.
I believe the tank has a feature at the bottom to prevent vortices, but I'm not aware of any other safeguards.
Thanks, all, for the responses. We're going to try shutting off the line through the cooler to see if that improves control.
Edited by jstall, 02 December 2021 - 10:23 AM.