SPX Cooling Technologies TG MAG15-50 Water Pump User Manual


 
41
A.0500.551 – IM-TGMAG/02.00 EN (02/2008)
Symptom Cause Remedy
No flow
Pump not priming
Suction lift too high 1 Reduce difference between
pump and suction tank level.
Increase suction pipe diameter.
Reduce length and simplify suction pipe (use as
few elbows and other fittings as possible).
Also see section 3.18 Installation.
Air leak in suction line 2 Repair leak.
Very low viscosity 3 Increase pump speed and reduce axial clearance
(see section 3.21 Maintenance instructions).
Suction strainer or filter clogged 4 Clear suction strainer or filter.
Pump casing incorrectly installed
after repair
5 Install pump casing correctly.
See section 3.18 Installation.
Wrong direction of rotation of motor 6 For 3-phase drivers change 2 connections.
Change suction and discharge opening.
(Attention! Check the location of the safety relief
valve and correct circulation pump insert).
Magnetic coupling is slipping 7 Check/correct assembly of rotor shaft and bear-
ings and magnetic coupling
Check start-up conditions for the magnetic cou-
pling in combination with applied electrical motor
if necessary add fly-wheel or apply soft start.
Check operating parameters against break-away
torque of the magnetic coupling.
Check if the pump is blocked, remove blockage.
Irregular flow Liquid level in suction tank falls too low 8 Correct liquid supply
Provide a liquid level switch
Output too high 9 Reduce pump speed/or install a smaller pump.
Install by-pass line with check-valve.
Air sucking 10 Repair leak in suction line.
Cavitation 11 Reduce difference between pump and suction
tank level.
Increase suction pipe diameter.
Reduce length and simplify suction pipe (use as
few elbows and other fittings as possible).
Also see chapter 3.18 Installation.
Liquid vaporises in pump
(e.g. by heating up)
12 Check temperature.
Check vapour pressure of liquid.
Reduce pump speed. If necessary install a larger
pump.
Not enough capacity Pump speed too low 13 Increase pump speed. Attention! Do not exceed
maximum speed and check NPSHr.
Air sucking 14 Repair leak in suction line.
Cavitation 15 Reduce difference between pump and suction
tank level.
Increase suction pipe diameter.
Reduce length and simplify suction pipe (use as
few elbows and other fittings as possible).
Also see section 3.18 Installation.
Back pressure too high 16 Check discharge pipe.
Increase pipe diameter.
Reduce working pressure.
Check accessories (filter, heat exchanger, etc.).
Safety relief valve set too low 17 Correct pressure setting.
Viscosity too low 18 Increase pump speed. Attention! Do not exceed
maximum speed and check NPSHr.
If necessary, install a larger pump.
Axial clearance 19 • Check axial clearance and correct.
See section 3.21 Maintenance instructions.
Gases come free 20 Increase pump speed. Attention! Do not exceed
maximum speed and check NPSHr.
Install a larger pump
3.20 Trouble shooting