Slightly off topic,
In the old document I found this under performance:
NPSH REQ'D (WATER), FT: 8.4' @ IMPELER EYE
and when I contacted this old pump mfq, they generated a new computer graph with NPSHR Required which is graphed at 8.4ft as well approximately.
I read the McNally Institute and...
Thank you. In the future, I should be careful to implicit trust to the answer from the operator without matching their answer with given data.
Thank you everyone!
The 100F TVP value is used from what I found in the lab analysis of the propane that is available at the plant.
Again: How is it that your surface pressure is less than the vapor pressure? The reason is that I did not understand TVP definition clearly. After searching the forum and looking back...
TD2K,
No, I did not account for the line losses through their inlet piping. The 3.4' is the line losses from piping length and the elbows only.
Wilbur55,
According to operator the pressure of the vessel varies between 120-160 psig. I am using average of 140 psig.
I think my error was on the...
Thank you.
Let me clarify,
This is a vertical turbine pump withdrawing propane from an elevated horizontal closed tank.
- Height of the liquid inside the horizontal tank (worst case) = 1'
- Height from the bottom of the horizontal tank to the suction of the pump = 3'10"
- Height from the...
Hi all,
I am a new engineer and trying to wrap my head around this.
I have a pressure vessel, single wall, filled with liquid propane going to the a pump on 8” line, 800 feet, 20 long radius 90 bends.
Total elevation from liquid surface to the center of the pump impeller is 11 feet. It is an...
