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Use pipes of internal diameter at least as large as the nominal bore of the pump ports.
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Fit an adequately sized suction strainer to protect the pump form debris.
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Make sure that it is accessible and remember to inspect periodically.
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Remember that small electric submersible pumps are
rarely useful at more than 1.2m head. Medium/large submersibles are less
effective above about 2m head.
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Install electric self priming pumps as low as possible, consistent with a dry, ventilated and accessible location.
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Keep suction pipework as short and straight as
possible. Use reinforced hose that will not deform or collapse under
suction conditions. Check that all connections are airtight.
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Avoid multiple valved inlet pipework if possible. If
unavoidable ,take extra care to make all joints airtight. To avoid
airlocks , make sure that the inlet pipework rises all the way to the
pump.