Pulsafeeder Eclipse Model 75 - Manual (Page 10)

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o Do not force, bend, or spring either suction or discharge piping when mating up to the pump. Use supports or
hangers at intervals as required in an effort to compensate for piping strain due to vector forces and bending
forces. When necessary, install thermal expansion joints or accessories so minimal piping strain is placed
upon the pump.
o Check all bolts and nuts for tightness. Correct any conditions that could cause destructive vibration or
leakage.
o If start-up screens are used, be sure they do not clog and starve suction. Start up screens should be removed
prior to placing system into regular operation.
o If flexible suction lines are used, be sure their selection and installation will prevent wall collapse and thus a
starved suction condition.
o When taking suction from a tank or vessel, avoid entry of sludge or solids into suction line by placing suction
line inlet above maximum expected level of solids.
o Discharge line should be fitted with properly sized pressure relief valve to protect both pump and discharge
system. Pressure relief valve outlet should be piped back to the supply tank.
o When a by-pass system is used to control flow from the pump, the bypassed fluid should be piped back to the
suction vessel to prevent heat build-up due to recirculation cavitation. If it is absolutely necessary to pipe by-
pass back to the pump suction line, the point of entry should be at least one foot away from the suction inlet.
Provision for cooling should be made in the event of excessive heat buildup through fluid recirculation.
o Where pumped fluids may solidify, crystallize, or precipitate, provisions should be made to thoroughly flush
pump and piping prior to periods of shutdown. Pay particular attention to proper flushing and draining of the
magnetic coupling area because this area may not completely self drain.
Figure 2b – Flow vs. Motor Rotation