salmson No Serie Instrucciones De Montaje página 9

ENGLISH
Replacement frequency
1450 rpm
Description On each 1
dismantling
year
•
All gaskets
Front/rear
•
bearings
Impeller
•
key
Impeller nut
•
Lockwasher
Fabric
•
packing
Mechanical
seal
Shaft
•
sleeve
Shaft
Impeller closed
Pump screws
and bolts
Coupling catch
or spring
Bottom
(3)
Bearing
•
Circlips
Gland
8 . OPERATING TROUBLES
Switch the pumps OFF before doing any work on them.
TROUBLE
8.1 DIFFICULT PUMP PRI- a) Foot valve blocked or strainer clog-
MING
b) Air penetration on suction pipe or at
c) High point in the suction conduct, for-
d) Air penetration at the gland:
e) Pump not vented:
f) NPSH not complied with:
g) Speed too high in suction pipe:
h) Pumping of liquid containing air:
8.2 THE PUMP DOES NOT
a) Valve closed on discharge:
FLOW
b) The pump turns in reverse direction:
8.3 FLOWRATE TOO LOW a) Valve on discharge partially open:
(or not enough pressu-
b) High head losses:
re)
c) Motor-pump speed too low:
d) Conveyed products more viscous
e) Suction pipe partially clogged or fou-
8.4 IRREGULAR PULSATORY a) Air or steam penetration:
FLOWRATE
a) Elevation height greater than plan-
8.5 FLOWRATE TOO HIGH
2900 rpm
2 3 5 On each 1 2
dismantling
years years years year years years years
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• • •
•
•
• (1)
• (2)
• •
•
•
• •
•
•
•
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CAUSE
ged:
flange gaskets of valves:
ming air pockets:
than planned:
led:
ned, or pipe with too large a diameter:
(1) or every 3 months - (2) every 6 months - (3) Descaling every 2 years if the
water is not treated.
3 5
•
•
•
•
•
•
a) Dismantle and rinse with jet.
b) No air penetration should be tolerated on this pipe: check all gaskets of flanges,
valves, plugs.
c) The pipe shall show ascending grade up to the pump (2 cm minimum per meter).
d) Re-tighten the gland evenly and check the injection connection.
e) Bleed by removing the pressure gauge plug.
f) Check it.
g) 1.5 m/s for liquids with low steam tension, 0.8 m/s for other products.
h) Review the installation.
a) Check and open it.
b) Reverse the direction of rotation by reversing 2 wires on the motor terminal block.
a) Open it progressively and fully until pressure is stable.
b) Check again the head losses (replaces pipes with other with larger diameter).
c) Wrong connection (star for triangle). Voltage too low: measure and reinforce the line
if necessary.
d) Get in touch with the manufacturer.
e) Check the pipe. Clean.
a) Perform methodical troubleshooting:
• on the suction pipe, check whether the strainer is well immersed to prevent the for-
mation of vortex,
• at the gland (braid) that should leak (drop by drop) when off, and motor-pump ope-
rating.
a) Reduce the flowrate through a diaphragm, by partial closing of the discharge valve or
by recycling.
9
REMEDY