Metering Pump
Metering Pump
(OP)
According to API 675 section 2.1.15 it states that "Rated Capacity shall be at least 110 percent of the maximum capacity specified".
What does it mean?
What does it mean?
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RE: Metering Pump
Your data sheet would show the minimum and maximum operating capacities. The pump should be capable of pumping 10% more than maximum operating. Since the pump is not operating at the extreme design limits, it should have a longer service life.
RE: Metering Pump
RE: Metering Pump
If the reason behind this is service life or packing worn I don't know. I will be more inclined to think that is because of pump efficiency (depending if plunger or dipahragm and also viscosity, discharge pressure etc...you may have difference efficiencies around 90-95%)
I don't think is service life, many petrochemical companies already limit the strokes per minute on their specifications for API675 pumps, which in my opinion is the real service life factor.
If it is packing worn and MTBM I assume this could be really important in plunger pump, but, does it affect so much in diaphragm pumps?
Please correct me if I'm wrong!
RE: Metering Pump
and its maximum capacity, its accuracy is measured over a range determined by the pump's
turndown ratio.
Metering pump accuracy tends to drop off slightly as the pumping rate approaches either end of the operating range of flows, min or max. Adding 10% capacity increases the upper flow range and since you are now pumping at 85% to 90% of the pump's capacity, the accuracy is expected to be improved.
RE: Metering Pump