Compressed air, gas and vacuum solutions
www.aerzen.co.uk
+44(0) 208 502 8100
sales@aerzen.co.uk
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Pumps with an outlet at the top or a
spiral casing will discharge more heat.
Tip: Never operate a pump outside the
defined thermal operating limits.
8. What is the nature of the
electrical connection?
There are pumps for almost all capacity
ranges. The higher the range, the higher
the connected load needs to be, and an
appropriate connection on site is
required. O•en the (high!) start-up
current of the pump is not taken into
account, especially when a power set is
used. Most pumps are operated in a
single phase with 230V or in three
phases with 400V. They are all con-
nected with direct or star-triangle
starters. Tip: Use only pumps with APEX
approval in potentially explosive areas.
9. How should the pump be
installed and operated?
Some pumps may be installed only in a
dry environment in the pumping station.
By contrast, submersible pumps are
operated while submerged in the
medium. The maximum submersion
depth is stated in the data sheet. Just ask
if they are suitable for permanent
operation. Tip: Ensure the pump has a
centrifugal oil lubrication system
because these will work perfectly in
either horizontal or vertical installation
positions.
10. Should I carry out the
maintenance work myself?
Anyone seeking to save money can carry
out the most common maintenance tasks
themselves on site, thereby ensuring
there are no downtimes because the
pumps do not have to be returned to the
manufacturer for servicing. Therefore, it
is always a good idea to opt for modular
pumps. Typical maintenance includes
replacement of the impeller at the intake
opening – only a few screws need to be
removed in Japanese pumps. Tip:
Nevertheless, opt for manufacturers that
have a good service network.
WWT PUMP AND VALVE SUPPLEMENT 2018 13
Summary
It is advisable to be well prepared when
you talk to pump experts, because
having the information about the
application and local environment at
your fingertips will speed up the
process considerably. Then there is the
question of delivery time. This might be
decisive because only a few manufac-
turers have large stocks of pumps
– most usually produce to order. In
general, users should also consider
lease options: major manufacturers and
dealers will keep available their own
stocks of lease units, enabling anyone
who is unsure of their exact require-
ments to experiment before investing.
