salmson NEX, Инструкция по установке и эксплуатации

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ENGLISH
22
10 FAULTS, CAUSES AND REMEDIES
Faults Causes Remedies
Pump
overheats
and seizes
- Pump not primed or filled with liquid Check for complete filling
- Insufficient margin between suction pressure and vapor pressure Check NPSH
A
> NPSH
R
, proper submergence, losses at strainers and
fittings
- Operation at very low capacity Measure the value and check minimum permitted.
Remedy or call Salmson
- Misalignment due to pipe strain Check the flange connections and eliminate strains using elastic
couplings or a method permitted
- Rotating part rubbing on stationary part internally Check and consult Salmson if necessary
- Bearings worn Replace bearings
- Shaft running off center because of worn bearings or misalignment Check misalignment and correct it if necessary. If alignment satisfactory
check bearing for excessive wear
- Impeller out of balance resulting in vibration Check and consult Salmson
- Excessive thrust caused by a mechanical failure inside the pump Check wear condition of impeller, its clearances and liquid passages
Bearings
have short
life
- Operating at high capacity Measure the value and check maximum permitted.
Remedy or call Salmson
- Misalignment due to pipe strain Check the flange connections and eliminate strains using elastic
couplings or a method permitted
- Shaft bent Check shaft runouts are within acceptable values
Consult Salmson
- Rotating part rubbing on stationary part internally Check and consult Salmson if necessary
- Bearings worn Replace bearings
- Shaft running off center because of worn bearings or misalignment Check misalignment and correct it if necessary. If alignment satisfactory
check bearing for excessive wear
- Impeller out of balance resulting in vibration Check and consult Salmson
- Excessive thrust caused by a mechanical failure inside the pump Check wear condition of impeller, its clearances and liquid passages
- Excessive grease in ball bearings Check method of regreasing
- Lack of lubrication for bearings Check hours ruin since last change of lubricant, the schedule and its
basis
- Improper installation of ball bearings (damage during assembly, incorrect
assembly, wrong type of ball bearings etc ) Check method of assembly, possible damage or state of cleanliness
during assembly and type of bearing used. Remedy or consult Salmson if
necessary
- Damaged bearing due to contamination Check contamination source and replace damaged ball bearings
- Motor running too slow Check motor terminal box connections and voltage
Pump
vibrates or
is noisy
- Pump or suction pipe not completely filled with liquid Vent and /or prime
- Suction lift too high or level too low Check NPSH
A
> NPSH
R
, proper submergence, losses at strainers and
fittings
- Insufficient margin between suction pressure and vapor pressure Check NPSH
A
> NPSH
R
, proper submergence, losses at strainers and
fittings
- Foot valve too small Investigate replacing the foot valve
- Foot valve partially clogged Clean the foot valve
- Inlet of suction pipe insufficiently submerged Check out system design
- Operation at very low capacity Measure the value and check minimum permitted.
Remedy or call Salmson
- Operating at high capacity Measure the value and check maximum permitted.
Remedy or call Salmson
- Misalignment due to pipe strain Check the flange connections and eliminate strains using elastic
couplings or a method permitted
- Improperly designed foundations Check setting of baseplate : tighten, adjust, grout base as required
- Shaft bent Check shaft runouts are within acceptable values
Consult Salmson
- Rotating part rubbing on stationary part internally Check and consult Salmson if necessary
- Bearings worn Replace bearings
- Impeller damaged or eroded Replace or consult Salmson for improved material selection
- Shaft running off center because of worn bearings or misalignment Check misalignment and correct it if necessary. If alignment satisfactory
check bearing for excessive wear
- Impeller out of balance resulting in vibration Check and consult Salmson
- Excessive thrust caused by a mechanical failure inside the pump Check wear condition of impeller, its clearances and liquid passages
- Excessive grease in ball bearings Check method of regreasing
- Lack of lubrication for bearings Check hours ruin since last change of lubricant, the schedule and its
basis
- Improper installation of ball bearings (damage during assembly, incorrect
assembly, wrong type of ball bearings etc ) Check method of assembly, possible damage or state of cleanliness
during assembly and type of bearing used. Remedy or consult Salmson if
necessary
- Damaged bearing due to contamination Check contamination source and replace damaged ball bearings
- Wrong direction of rotation Reverse two phases at motor terminal box
- Motor running too slow Check motor terminal box connections and voltage
Mechanical
seal
has
short life
- Misalignment due to pipe strain Check the flange connections and eliminate strains using elastic
couplings or a method permitted
- Shaft bent Check shaft runouts are within acceptable values
Consult Salmson
- Bearings worn Replace bearings
- Shaft sleeve worn or scored or running off center Check and renew defective parts
- Mechanical seal improperly installed Check alignment of faces or damages parts and assembly method used
- Incorrect type of mechanical seal for operating conditions Consult Salmson
- Shaft running off center because of worn bearings or misalignment Check misalignment and correct it if necessary. If alignment satisfactory
check bearing for excessive wear
- Impeller out of balance resulting in vibration Check and consult Salmson
- Abrasive solids in liquid pumped Check and consult Salmson
- Internal misalignment of parts preventing seal ring and seat from mating
properly Check and consult Salmson
- Mechanical seal was run dry Check mechanical seal condition and source o f dry running and repair
- Internal misalignment due to improper repairs causing impeller to rub Check method of assembly, possible damage or state of cleanliness
during assembly.
Remedy or consult Salmson if necessary
Mechanical
- Misalignment due to pipe strain Check the flange connections and eliminate strains using elastic
couplings or a method permitted