An air
operated double diaphragm pump is a very reliable pump type and certainly very
easy to operate and maintain. Nevertheless, there are a number of things that
allow you to “kill” your pump.
1. Run the pump dry without limitations
Dry running AN AODD won't have an
on the spot negative impact on your pump, however, AN air operated
diaphram pump World Health Organization runs dry can speed up. This will
not only cause a bigger air consumption but the diaphragms will make a lot of
strokes and will come to the end of their elasticity much quicker and will
fail. To prevent this you can use a “Flow Stop Valve” in the air supply to your
pump. This valve can discover the larger air consumption and can fold the air
provide to the pump.
2. Operate the pump with smoked and/or very humid wind.
Air wet and
air quality square measure of utmost importance high wet or unhealthy quality
of the air will cause icing or preventive
of the air valve or muffler; the wet will condense in the air exhaust
because of temperature drop from high to low pressure and will cause clogging
the muffler. Also, waste collected over time can cause clogging. Use clean, dry,
filtered air to avoid clogging/icing of the muffler. Check the muffler on dirt
on an everyday basis and check the standard of the air you utilize to control
the pump. If the plant air is from low quality the use of an ”Anti-Ice Muffler”
and Installing an air filter in the compressed air line before the pump will
also help you to run the pump error-free.
3 Start-up of the pump at full pressure
It is always
recommended to start up a diaphragm pump slowly.
If gas
pressure provided to the pump is simply too high, while the pump is not filled
with liquid, the pump will change over too quickly and the valve balls will not
have enough time to close the valve seat to create a vacuum to drawn the liquid
into the pump. On automatic on/off systems, it is recommended to install a “Soft
start valve” in the air supply to the pump.
4 Use always the same diaphragms on different applications
An incorrect
diaphragm selection can cause rupture of the diaphragm and many other problems
to the pump. The lifetime of diaphragms depends strongly on the material the
diaphragm is made of. Always check if the fabric of your diaphragm is resistant
against the liquid you're pumping. PTFE diaphragms will be used on the majority
chemical applications, but don’t have the best mechanical strength so will be
prone to wear in abrasive applications. Diaphragms fabricated from shaped PTFE
on a rubber layer can provide a higher result on this sort of applications. If
not sure, ask a specialist which material to use as diaphragm will give you the
best cost/lifetime combination for your application.
5 Run the pump with high inlet pressure
An AODD
making an irregular noise “like a machine gun” is a typical problem of an AODD
running at too high inlet pressure. The valve balls on the suction aspect are
going to be pushed from their seat by the liquid pressure and can begin running
around in their cage, generating this “machine gun noise”. Try to install an
AODD always in such a way the pump has to create suction lift or only has a
very limited positive inlet pressure. Using heavier valve balls (example rubber
balls with a steel core) also will cut back this drawback.
6 Installing an air line within inner diameter that is too
small
Using an
air-line that is too small, or air equipment in the air supply which are
reducing the volume of air your pump needs to operate well, will starve the
pump of the compressed gas, making it operate slowly. Upgrading to a larger
air-line and/or air equipment which can handle a bigger air flow is the
solution. A rule of thumb is to use air equipment and hoses of the same
internal diameter as the air connection of the pump. Check the operating manual
of your pump for the correct size of air supply.A Verder Diaphragm Pump
7 Installing a fluid piping to the pump which is too small
A suction
tube that is too tiny can cause cavitation inside your pump and will degrade
the lifetime. A discharge line that is simply too little can produce larger
pressure losses and can cut back the flow capability of your AODD. If not sure,
please contact your pump specialist with the necessary info of your application
to select the best pipe-size for your installation.
8 Run your pump fast on abrasive applications
If you run
an AODD fast on abrasive applications, the valve seats, and balls will run out
very quickly. Also, the life-time of your diaphragms will be reduced. On those
applications, you will need to use a bigger pump running slower.
9 Not taking suction lift and viscosity of your medium in
account by selecting your diaphragm pump.
All AODD pump
manufactures square measure commercial enterprise pump curves supported
water and therefore the pump running while not suction raise. But due to the
way of working, compressed air supplied to the pump is used at the same time
for suction lift and to discharge your medium. When AN AODD pump needs to give
suction raise, the maximum flow rate of the pump will be reduced.
Pumping
media with higher consistency can produce a lot of pressure drop within the
pump. The pump can got to use a lot of power to push the liquid out of the pump
chamber through the ball/seat combination within the discharge line. By doing
this the maximum capacity of the pump will be reduced.
Always check
the flow reduction curves of suction raise and consistence yet once choosing
pump or check the choice together with your native pump specialist.
10 Not exploitation the foremost economical double diaphragm
pump
Not economical
AODD pumps can have an even bigger air consumption and can would like longer to
try to to the task. This will generate a lot of maintenance not solely at the
pump, however additionally on the compressed gas installation. (compressor,
dryer, supply pipes,…)
Comments
Post a Comment