Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 17)

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v) It is recommended that all piping and associated equipment from the
tank to the discharge point is thoroughly cleaned before installation of
the pump to avoid the possibility of debris entering the pump and
causing damage.
vi) Pressure gauges should be installed adjacent to the pump suction and
discharge connections such that system pressures can be monitored.
These gauges will provide a clear indication of changes in operating
conditions and where a relief valve is incorporated in the system, will
be necessary for setting and checking the functioning of the valve.
vii) It is imperative that the suction condition at the pump inlet meets the
Net Positive Suction Head Required (NPSHr) by the pump. Failure to
observe this could cause cavitation, resulting in noisy operation,
reduction in flow rate and mechanical damage to the pump and
associated equipment.
The Net Positive Suction Head Available (NPSHa) from the system must
always exceed the Net Positive Suction Head Required (NPSHr) by the pump.
Observing the following general guidelines should ensure the best possible
suction condition is created.
- Suction piping is at least the same diameter as the pump connections.
- The length of suction piping is kept to the absolute minimum.
- The minimum number of bends, tees and pipework restrictions are
used.
- That calculations to determine system NPSHa are carried out for the
worst condition, see Fig 7.
Should advice on pump or system NPSH characteristics be required contact
Viking Pump or your Viking Pump distributor.
Fig 7
WARNING
WARNING
WARNING
WARNING