V, Assembling and disassembling
YW Underwater pump assembly sequence
(1) To install the bearing in the bearing body.
(2) To install the oil-sealing felt rings separately in the bearing body and the bearing end.
(3) To embed the mechanical seal in shaft sealing.
(4) To install the bearing end cover near the mechanical seal on the shaft, to install the "O" ring, shaft sleeve and installed bearing lower bearing body on the shaft with screw to tighten bearing end cover, to install the intermediate pipe and shaft seal body on the upper and lower side respectively of the bearing body with screw to tighten, an then to screw the bearing end cover on the intermediate bearings, the bond is embed into the shaft, the coupling shaft housing is loaded on the shaft with upper shaft embed bond in the coupling shaft housing, the upper coupling pipe installs on the intermediate bearing with screw to tighten, the parts above should install on the supporting tray and the upper bearing body on the supporting tray with screw to tighten and bearing end cover to install.
(5) To install the pump cover on the shaft seal and to tighten with screw, to embed the impeller bond in the shaft and to install the impeller and the thrust washer in turn with impeller nut to fix, the pump body installs on the pump cover with screw to tighten, to install the front cover and to tighten with screw and pump body.
(6) To install the shaft coupling part on the upper shaft, and to fasten the motor shaft coupling with the fastening screw on the shaft head, the motor is connected tightly with motor seat.
(7) To install and to fix the asbestos cushion, the elbow and the outlet pipe on the supporting tray from the pump exit sequence.
Ⅵ, Installation
1. The equipment work before installation.
a. To inspect whether the water pump and motor damaged
b. Preparation for tool and hoisting equipment
c. To inspect the foundation according to drawing.
2. To install the pump supporting base on the vessel and to tighten the screw (for example the cement well must establish foundation screw in advance).
Ⅷ, Start up and stop
1. To observe whether the pump installation foundation already to be stable and whether all the parts screw already to be tight.
2. To inspect whether the pump axis gap already to adjust well (pulled coupling not have fricative).
3. Oil standard pours into the calcium base grease.
4. To inspect whether the electric motor rotation direction to be correct.
5. To start up the motor, to turn on the gauge meter, the gate valve should open the demand scope when the pump rotated entirely.
6. When pump stop working, it should stop the electric motor at first, then close the gauge meter.
7. The pump should stop running for a long term, should disassemble and clean the pump, wipe and preserve the antirust oil.
Ⅸ, Operation
1. Pay attention to the pump bearing temperature, which should not surpass the environment temperature with 35℃, but the highest temperature should be not bigger than 75℃.
2. The lubricate cap should fill up the calcium base grease to guarantee the bearing can lubricate normally.
3. The pump should replace the electric motor supporting in works in the first month or work for 100 hours later, to replace for working every 2000 hours.
4. Periodic inspection of the flexible coupling, pay attention to the electric motor bearing temperature to rise.
5. In the running process, if to find the noise or unusual sound, which should stop the inspection immediately.
6. The pump should make the periodic inspection for every 2000 hours, the gap wear between impeller and pump body (pump cover) can not be too large, the gap maximum value does not surpass 1.5 mm, can replace the impeller or the front cover if surpassed.
Ⅹ、Common faults and removal method
|
Common faults |
Possible reason |
Removal method |
|
No water pumped, the pressure gauge pointer violent beating
|
1. Inlet pipe siltation
2. Pipe and instrumentation leakage
|
1. Remove the blockage
2.Block up the air leakage parts |
|
No water pumped |
1.Pump inlet higher than liquid level
2. Wrong rotating direction |
1.Heighten the liquid level or descend the pump installation height
2.Inspect motor swerve |
|
Gauge indicates there are some pressure on the outlet, where still not pump the water |
1.Outlet pipe resistance is large
2.Impeller siltation
3.Revolution deficiency |
1.Inspect the pipe
2.Clean impeller
3.Add pump revolution |
|
Flow rate over-lowing |
1.Water pump siltation
2.Revolution deficiency
3.Serious wearing in impeller |
1.Clean pump and pipe
2.Add the revolution
3.Change the impeller |
|
The pump consumed power is oversized |
1.Pump water supply is too small(or all closed)
2,Wearing in impeller |
1,Outlet pipe open the gate valve
2.Change the impeller |
|
Overheating in bearing |
1,Bearing oil starvation
2,Bearing feculence or damage |
1,Add lubrication
2,clean bearing or replace bearing |
