Troubleshooting - Seko SPRING Manuel D'installation

5. TROUBLESHOOTING

Trouble Possible cause
Suction tank sealed without vent
Flow rate
too low or Suction of air through fittings, gaskets, etc.
no flow rate
Air/gas pockets into the pump or in the pipes
Suction filter or suction line clogged
Check valves closed
Excessive suction head
Vapour pressure too high, liquid temperature too high
Viscosity too high, liquid temperature too low
Pump valves dirty or worn
Strokes per minute less than rated
Suction pipe diameter too reduced
Pressure relief valve set at a value lower than the maximum
discharge pressure
Wrong stroke length
Excessive leakage through packing
Pressure relief valve in operation or leaking
Discharge pressure lower than suction pressure
Flow rate
too high
Wrong stroke length
Back pressure valve faulty or setting pressure inadequate
Strokes per minute more than nominal
Electric mo- Discharge pressure too high
tor overheat-
Discharge line uncorrectly sized
ing
Wrong electrical connections
Noisy opera- Lack of lubricant in the mechanism/gearbox
tion
Excessive wear of the mechanism/gearbox
Pipe diameter too small
Pipes vibra-
tions Pulsation damper out of operation or too small
SPR0136001
Remedy
Install vent or open tank cover
Tighten connections
Facilitate air exit
Wash filter and/or remove occlusion
Open valves
Reposition pump at the correct elevation
Cool liquid
Heat liquid
Wash valves or replace them
Check speed and electrical feeding
Check suction line for length and diameter
Check pressure relief valve setting and actual operating pres-
sure
Check stroke length and adjust if required
Tighten packing, check plunger and packing for wear; replace
worn parts
Check for correct setting and/or clean pressure relief valve
Install a back pressure valve
Check stroke length and adjust if required
Reset back pressure valve or replace it
Verify electrical feeding
Check pressure relief valve setting
Check discharge line length and diameter
Check and rectify connections
Refill with the correct lubricant
Overhaul mechanism/gearbox
Enlarge pipe diameter
Repair or recalculate damper volume
Rev. 2.4 EN 8