DOES
MY PUMP NEED TO BE PRIMED?
Do
you know which pumps in your facility require priming? Which are self-priming?
If
you don't, starting a pump means you're taking a pretty big chance. Don't be
the one that guesses wrong.
Read
on to find out why priming is important and which pumps will require it before
getting started.
What is Priming?
Priming the pump readies it for use.
A
pump's casing must be filled with fluid before starting. If not, the pump will
be unable to function.
If
vapor or gas exist inside the casing, the pump will become gas bound, and won't
pump.
Priming
is the action of filling the casing with fluid before startup.
Centrifugal Pumps
Priming is an important aspect in maintaining the
functionality of a centrifugal pump.
Water
or the fluid pumped acts as a coolant, preventing the pump from overheating.
Failing
to do so causes the pump to run dry, causing mechanical seal failure, and
serious damage to pump components.
Depending
upon the piping configuration, a pump may not need manual priming.
A
flooded suction condition is when the suction port on the pump is lower than
the liquid level pumped. In this configuration, the pump is already filled with
fluid and is considered primed.
When
the liquid level is below the suction port, priming becomes more difficult.
This is where having a pump with suction lift capability is important.
Pumps
such as the Gorman-Rupp T-Series are
well known for this. Check out this video from Gorman-Rupp that explains how
self-priming pumps prime.
Positive Displacement Pumps
Though it depends upon the pump and application, a positive
displacement pump, is generally a self-priming pump.
This
characteristic allows for flexibility in system layout and eliminates the need
for suction priming systems.
For
instance, air operated diaphragm pumps self-prime
by creating a pressure differential in the diaphragm chamber. This draws in air
and pulls the fluid into the suction port.
Positive
displacement pumps also have excellent suction lift capabilities.
In
short, to avoid failures, centrifugal pumps must always be
primed before operating.
Positive
displacement pumps are self-priming with suction lift capability, but always
check the operation manual or confer with an engineer to ensure the pump will
properly function at start up without priming first.
Is
your pump not priming? Ask us about it! We gladly provide technical assistance to businesses and
municipalities in Wisconsin and upper Michigan.
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