rawelk
Industrial
- Apr 11, 2002
- 72
Wondering if there are any rough rules of thumb for estimating polymer melt pump service life. While performing data logging on one of our 4-1/2" APET lines for an extruder screw load instability problem noted pump discharge pressure was much lower than expected.
For a suction pressure of 850 PSI discharge pressure was sometimes only 50 PSI higher, and other times even less than suction pressure. I was about to discount this as being due probe readout miscalibration when realizing variations in trended discharge pressure closely followed those of both head pressure and extruder screw load.
The pump in question is a Maag 70/70 originally installed circa 1990, and used for perhaps two years running PS, but the remainder of it's service has been with APET.
Does this set of curves suggest pump wear-out?
Trending was done with an LDS Vision 16 channel logger at a 10 sample/sec rate.
For a suction pressure of 850 PSI discharge pressure was sometimes only 50 PSI higher, and other times even less than suction pressure. I was about to discount this as being due probe readout miscalibration when realizing variations in trended discharge pressure closely followed those of both head pressure and extruder screw load.
The pump in question is a Maag 70/70 originally installed circa 1990, and used for perhaps two years running PS, but the remainder of it's service has been with APET.
Does this set of curves suggest pump wear-out?
Trending was done with an LDS Vision 16 channel logger at a 10 sample/sec rate.