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| 16.03.2010 |
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SIHI HEGA Multistage (Boiler feed) Trouble Shooting FAQ
Delivery performance decreases
| Possible cause and implicit solution |
| Suction filter, foot valve clogged. |
| Foot valve does not reach down far enough into the delivery liquid. |
| Incorrect layout of suction line (formation of air pockets). |
| Screwed joints or flanges in the suction line not leak-tight. |
| Ingress of air via leaking valves and fittings in the suction line (stuffing box, etc.). |
| Static suction lift too great. |
| Static suction head too low (difference between pressure and suction flange at vapour pressure too low). |
| Delivery liquid contains too much gas and/or air. |
| Delivery liquid too viscous. |
| Impeller clogged. |
| Impeller damaged. |
| Wear rings worn. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Sealing liquid lines/circulation lines clogged. |
| Unsuitable casing seal. |
| Pumped liquid contaminated. |
| Type of the pump is unsuitable. |
| Temperature of handled liquid too high. |
62,50% of 8 voters found this FAQ useful, I found this FAQ  useful  not useful Delivery stops 
| Possible cause and implicit solution |
| Suction filter, foot valve clogged. |
| Foot valve does not reach down far enough into the delivery liquid. |
| Shut-off valve in the feed line in unfavourable position. |
| Incorrect layout of suction line (formation of air pockets). |
| Valve(s) in the suction or feed line not fully open. |
| Screwed joints or flanges in the suction line not leak-tight. |
| Ingress of air via leaking valves and fittings in the suction line (stuffing box, etc.). |
| Static suction lift too great. |
| Static suction head too low (difference between pressure and suction flange at vapour pressure too low). |
| Cut-out level for starter too low (in automatic plants). |
| Delivery liquid contains too much gas and/or air. |
| Delivery liquid too viscous. |
| Insufficient venting. |
| Speed too high (number of revolutions of the driver higher than nominal number of revolutions of the pump). |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Impeller clogged. |
| Sealing liquid lines/circulation lines clogged. |
| Lantern ring in the stuffing box is not positioned below the sealing liquid inlet. |
| Sealing liquid omitted. |
| Mechanical seal blocked; O'ring, rotating seal ring, rubber bellow or stationary seal ring damaged. |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Incorrect designing of the pump for the given operating conditions. |
| Temperature of handled liquid too high. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Mechanical seal untight
| Possible cause and implicit solution |
| Impeller damaged. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Delivery liquid contaminated. |
| Sealing liquid lines/circulation lines clogged. |
| Mechanical seal blocked; O'ring, rubber bellow, rotating seal ring or stationary seal ring damaged. |
| Spring of the mechanical seal damaged. |
| Insufficient cooling water supply. |
| Sediment in the cooling water chambers. |
| Shaft runs untruely (not concentrically). |
| Shaft bent or worn. |
| Rotor insufficiently balanced. |
| Rotor parts touch the casing. |
100,00% of 3 voters found this FAQ useful, I found this FAQ useful not useful Motor doesn't start
| Possible cause and implicit solution |
| Delivery liquid too viscous. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Short circuit in the motor. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Motor gets hot or burns out
| Possible cause and implicit solution |
| Delivery liquid too viscous. |
| Speed too high (number of revolutions of the driver higher than nominal number of revolutions of the pump). |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Packing incorrectly fitted. |
| Gland tightened too much/slanted. |
| Axial thrust too great because of worn wear rings, obstructed relief holes. |
| Rotor parts touch the casing. |
| Coupling incorrectly fitted or loose. |
| Delivery flow rate to great. |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Incorrect designing of the pump for the given operating conditions. |
| Voltage too low/power supply overloaded. |
| Short circuit in the motor. |
| Setting of circuit-breaker for motor too high. |
66,67% of 3 voters found this FAQ useful, I found this FAQ useful not useful Motor starts with difficultiy
| Possible cause and implicit solution |
| Delivery liquid too viscous. |
| Speed too high (number of revolutions of the driver higher than nominal number of revolutions of the pump). |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Packing incorrectly fitted. |
| Gland tightened too much/slanted. |
| Foundation incorrectly set. |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Rotor parts touch the casing. |
| Incorrect designing of the pump for the given operating conditions. |
| Voltage too low/power supply overloaded. |
| Short circuit in the motor. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pump casing untight
| Possible cause and implicit solution |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Unsuitable casing seal. |
| Tie bolts not tight enough. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pump delivers at reduced capacity
| Possible cause and implicit solution |
| Suction filter, foot valve clogged. |
| Nominal diameter of suction line too small. |
| Foot valve does not reach down far enough into the delivery liquid. |
| Ground clearance of foot valve too narrow. |
| To many bends, elbows, valves, etc. in the suction line. |
| Shut-off valve in the feed line in unfavourable position. |
| Incorrect layout of suction line (formation of air pockets). |
| Valve(s) in the suction or feed line not fully open. |
| Screwed joints or flanges in the suction line not leak-tight. |
| Ingress of air via leaking valves and fittings in the suction line (stuffing box, etc.). |
| Static suction lift too great. |
| Static suction head too low (difference between pressure and suction flange at vapour pressure too low). |
| Delivery liquid contains too much gas and/or air. |
| Delivery liquid too viscous. |
| Insufficient venting. |
| Speed too low (number of revolutions of driver lower than nominal number of revolutions of pump). |
| Incorrect direction of rotation (electric motor connected incorrectly, leads on the terminal board interchanged). |
| Impeller clogged. |
| Impeller damaged. |
| Wear rings worn. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Incorrect designing of the pump for the given operating conditions. |
| Temperature of handled liquid too high. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful Pump does not deliver
| Possible cause and implicit solution |
| Suction filter, foot valve clogged. |
| Incorrect layout of suction line (formation of air pockets). |
| Valve(s) in the suction or feed line are not fully open. |
| Screwed joints or flanges in the suction line not leak-tight. |
| Ingress of air via leaking valves and fittings in the suction line (stuffing box, etc.). |
| Static suction lift too great. |
| Static suction head too low (difference between pressure and suction flange at vapour pressure too low). |
| Delivery liquid too viscous. |
| Insufficient primming. |
| Speed too high (number of revolutions of the driver higher than nominal number of revolutions of the pump). |
| Speed too low (number of revolutions of driver lower than nominal number of revolutions of pump). |
| Incorrect direction of rotation (electric motor connected incorrectly, leads on the terminal board interchanged). |
| Incorrect direction of rotation (electric motor connected incorrectly, leads on the terminal board interchanged). |
| Impeller clogged. |
| Sealing liquid lines/circulation lines clogged. |
| Lantern ring in the stuffing box is not positioned below the sealing liquid inlet. |
| Sealing liquid omitted. |
| Mechanical seal blocked; O'ring, rubber bellow, rotating seal ring or stationary seal ring damaged. |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Incorrect designing of the pump for the given operating conditions. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pump gets hot and blocks
| Possible cause and implicit solution |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Sealing liquid lines/circulation lines clogged. |
| Sealing liquid contaminated. |
| Lantern ring in the stuffing box is not positioned below the sealing liquid inlet. |
| Sealing liquid omitted. |
| Packing incorrectly fitted. |
| Gland tightened too much/slanted. |
| Packing material not suitable for operating conditions. |
| Shaft sleeve worn in the area of the packing. |
| Axial thrust too great because of worn wear rings, obstructed relief holes. |
| Insufficient cooling water supply. |
| Sediment in the cooling water chambers. |
| Foundation or anchorage incorrectly set. |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Shaft runs untruely (not concentrically). |
| Shaft bent or worn. |
| Rotor insufficiently balanced. |
| Rotor parts touch the casing. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful Pump runs reversely
| Possible cause and implicit solution |
| Incorrect direction of rotation (electric motor connected incorrectly, leads on the terminal board interchanged). |
| Non-return valve blocked. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pumps delivers too much
| Possible cause and implicit solution |
| Speed too high (number of revolutions of the driver higher than nominal number of revolutions of the pump). |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Incorrect designing of the pump for the given operating conditions. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Pumps runs abnormally
| Possible cause and implicit solution |
| Impeller clogged. |
| Impeller damaged. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Bearings worn. |
| Insufficient lubrication of bearings. |
| Grase quality unsuitable. |
| Anti friction bearings incorrectly fitted. |
| Axial stress on roller bearings (no axial clearance of rotor). |
| Bearings dirty. |
| Bearings rusty (corroded). |
| Axial thrust too great because of worn wear rings, obstructed relief holes. |
| Coupling misaligned or loose. |
| Elastic elements of coupling worn. |
| Foundation incorrectly set. |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Shaft runs untruly (not concentrically). |
| Shaft bent or worn. |
| Rotor insufficiently balanced. |
| Rotor parts touch the casing. |
| Vibration of pipework. |
| Delivery flow rate too small. |
| Delivery flow rate too great. |
| Incorrect designing of the pump for the given operating conditions. |
100,00% of 2 voters found this FAQ useful, I found this FAQ useful not useful Pumps runs extremely noisy
| Possible cause and implicit solution |
| Suction filter, foot valve clogged. |
| Nominal diameter of suction line too small. |
| To many bends, elbows, valves, etc. in the suction line. |
| Shut-off valve in the feed line in unfavourable position. |
| Incorrect layout of suction line (formation of air pockets). |
| Valve(s) in the suction or feed line are not fully open. |
| Static suction lift too great. |
| Static suction head too low (difference between pressure and suction flange at vapour pressure too low). |
| Delivery liquid contains too much gas and/or air. |
| Insufficient venting. |
| Impeller clogged. |
| Impeller damaged. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Delivery flow rate too small. |
| Delivery flow rate too great. |
| Pump unsuitable for parallel operation. |
| Type of the pump is unsuitable. |
| Temperature of handled liquid too high. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful Rotor blocked while pump is at a stand-still
| Possible cause and implicit solution |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Foundation or anchorage incorrectly set. |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Rotor parts touch the casing. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Stuffing box shows extreme leakage
| Possible cause and implicit solution |
| Impeller damaged. |
| Sealing liquid contaminated. |
| Packing incorrectly fitted. |
| Gland tightened too much/slanted. |
| Packing material not suitable for operating conditions. |
| Shaft sleeve worn in the area of the packing. |
| Bearings worn. |
| Pump casing under stress. |
| Shaft runs untruely (not concentrically). |
| Shaft bent or worn. |
| Rotor insufficiently balanced. |
| Delivery liquid contaminated. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Stuffing box steams
| Possible cause and implicit solution |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Sealing liquid lines/circulation lines clogged. |
| Sealing liquid contaminated. |
| Lantern ring in the stuffing box is not positioned below the sealing liquid inlet. |
| Sealing liquid omitted. |
| Packing incorrectly fitted. |
| Gland tightened too much/slanted. |
| Packing material not suitable for operating conditions. |
| Shaft sleeve worn in the area of the packing. |
| Insufficient cooling water supply. |
| Sediment in the cooling water chambers. |
| Delivery liquid contaminated. |
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Temperature of the bearings too high
| Possible cause and implicit solution |
| Impeller clogged. |
| Impeller damaged. |
| Wear rings worn. |
| Separation of crystals from the delivery liquid (fallen short of the temperature limit/equilibrium temperature). |
| Delivery flow rate too great. |
| Bearings worn. |
| Insufficient lubrication of bearings. |
| Anti friction bearings overgreased. |
| Grase quality unsuitable. |
| Anti friction bearings incorrectly fitted. |
| Axial stress on roller bearings (no axial clearance of rotor). |
| Bearings dirty. |
| Bearings rusty (corroded). |
| Axial thrust too great because of worn wear rings, obstructed relief holes. |
| Insufficient cooling water supply. |
| Sediment in the cooling water chambers. |
| Coupling misaligned or loose. |
| Elastic elements of coupling worn. |
| Foundation or anchorage incorrectly set. |
| Pump casing under stress. |
| Pipe line transmit stress to pump casing. |
| Shaft runs untruely (not concentrically). |
| Shaft bent or worn. |
| Rotor insufficiently balanced. |
| Vibration of pipework. |
| Delivery flow rate too small. |
| Incorrect designing of the pump for the given operating conditions. |
100,00% of 1 voters found this FAQ useful, I found this FAQ useful not useful
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Condition monitoring of pumps