Ralph Stewart posted:
"1x and 3x, 1x = 0.673 mm/s, 3x = 1.162............................. the valve on 10% opened, the spectrum becomes 1x = 0.334 and 3x = 5.116 mm/s."
I would think it would be a 3 blade impeller and possibly some type of flow problem, causing vanepass and 1x (at times) to be high, even though it does not show a "raised floor" as you mentioned. May be a worn impeller.
Thanks and Have a Great Day,
Thank you Ralph,
I have just informed by my colleague that the number of blade is 4. I agree with you, this caused by blade pass or flow problem.
Have a great day