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Frequently
Asked Questions
Q - Does the sliding shoe pump
require an additional priming device?
A - No, self-priming of the sliding shoe pump is spontaneous,
without the use of an additional priming device. The only
requirement is that the pump is filled with liquid before first
start, or after a long shutdown.
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Q - Will the sliding shoe pump be damaged if left
running on a dry suction?
A - No, the sliding shoe pump remains full of liquid even when it
has a completely dry suction. It can run for long periods without
damage.
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Q - Does the suction pipe require a foot-valve when using the
sliding shoe pump?
A - No, the sliding shoe pump will displace any amount of air from
the suction pipe.
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Q - Can an isolating valve be fitted to the discharge pipework?
A - Yes, any positive displacement pump will develop a dangerously
high pressure, if run with the discharge throttled or shut off. If
an isolating valve is fitted to the suction pipework (or if it is
possible for an excessive head to be imposed on the pump by any
other cause), then the pump must be fitted with a pressure relief
valve, which is available as an option on all sliding shoe pumps.
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Q - Can a star-delta starter be used on electric driven sliding shoe
pumps?
A - No, when changing from star to delta, there is - for a fraction
of a second - a stage where the pump will stop and would effectively
be starting the pump in delta. We would recommend using
direct-on-line starters or ‘soft start’ starters.
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Q - What type of suction strainer should be used with the sliding
shoe pump?
A - The suction pipe must be fitted with a strainer of adequate
size. The total area of the holes should be approximately three to
four times the cross sectional area of the pipe. The
Megator Dolphin
strainer is ideally suited to this application.
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Q - Can Megator pumps run in parallel?
A - All Megator pumps will operate in parallel with one another, or
with other pumps, but certain points should be observed with regards
to the piping. A common suction pipe to two or more pumps may cause
one pump to interfere with the effective priming of another. each
pump should preferably have an individual suction line. If this is
not possible, each pump should be fitted with a non return valve.
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