HP Flowserve 71576286 7 FAULTS; CAUSES AND REMEDIES

FP USER INSTRUCTIONS ENGLISH 71576286 - 07/06

7 FAULTS; CAUSES AND REMEDIES

										Insufficient flow rate
										Irregular pump running
										Driver overloaded
										Mechanical seal leak
										Equipment vibration
										Excessive pump casing temperature
									POSSIBLE CAUSES	SOLUTIONS
									Pump or suction pipe not completely filled	- Check and complete filling
									Air bubbles in pipes	- Check and desecrate the pipes
									Suction level too low	- Check: the available NPSH > the required NPSH
										- Reduce geometrical suction lift
										- Reduce head losses in pipes and in fittings (diameter
										increase and appropriate fitting positions)
										- Check valves and strainers
										- Check the immersion head of the suction valve
									Wrong rotation	- Reverse 2 phases on motor terminal boxes
									The motor is running on 2 phases only	- Check and control the motor electrical power supply
									Motor running too low	- Check the connection in the terminal box according to the
										voltage
									Total manometric head system higher than	- Check the discharge head
									pump differential head	- Check the head losses in discharge pipes (partly closed valve,
										foreign particles, back pressure too high)
										- Modify the installation or change the pump set
									Total manometric head system lower than	-Throttle at discharge valve or trim the impeller (contact our
									pump differential head	local agent) CONSULT FLOWSERVE
									Pipes (valves, filter...)	- Control, dismantle and clean
									Insufficient flow rate	- Check the suction and discharge pipes (valves, back
										pressure)
									Worn wear-ring surfaces	- Foresee pump mending. CONSULT FLOWSERVE
									Seizure, jamming	- CONSULT FLOWSERVE
									Excessive strains on flanges	- Check the flange connections and eliminate strains (pipe
										positioning or elastic sleeves mounting)
									Defective gland packing on the shaft	- Check and replace all the gland packing parts
										- Mechanical seal: CONSULT FLOWSERVE
									Defective motor bearings	- CONSULT FLOWSERVE
									Specific gravity or viscosity of liquid too high	- Consult our local agent to analyze the problem
									Misalignment	- Check the alignment of the pump and of its driver
									Foundations not sufficiently rigid	- Check the setting of base plates: tightening, bad adjustment,
										seal
									Insufficient pressure
									Pump looses prime after starting
				POSSIBLE CAUSES						SOLUTIONS
				Rotation speed too low (check the driver)						- Check the connection in the terminal box according to the
										voltage
			Presence of air							- Check and de-aerate
				Suction pressure insufficient						- Check: the available NPSH > the required NPSH
				Mechanical defects						- CONSULT FLOWSERVE
			Air leak in the suction pipe							- Check suction pipe is airtight
			Restriction in suction pipe							- Check diameter of suction pipe
			Suction level too low							- Check the NPSH >NPSH
										- Reduce geometrical suction lift
										- Reduce head losses in pipes and in fittings (diameter increase
										and appropriate fitting positions)
										- Check valves and strainers
										- Check the immersion head of the suction valve
			Obstruction of suction pipe							- Check condition of pipe
			Defective gland packing on the shaft							- Check and replace all the gland packing.
										- Mechanical seal: CONSULT FLOWSERVE
			Defective gasket							- CONSULT FLOWSERVE

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