KIRLOSKAR i-HT, Instruction On Installation, Operation And Maintenance

Page: 11 / 50

IOM/i_HT Issue Date: 26/06/2009
Page 11 of 50
Last Revision:26/10/2009
A flexible coupling will only compensate for small amount of misalignment and should not
be used to compensate for excessive misalignment of the pump and driver shafts.
Inaccurate alignment results in vibration and excessive wear on the bearings, sleeve or
shaft and wear rings.
Coupling alignment can be checked with dial gauge Indicator also. Alignment should be
performed after the base plate has been properly set and grout has dried thoroughly
according to instructions. Final alignment should be made by shimming driver only.
Alignment should be made at operating temperatures.
After final alignment, it is necessary to dowel pump and driver feet to the baseplate.
FACTORS THAT MAY DISTURB ALIGNMENT
The unit should be periodically checked for alignment. If the unit does not stay in line
after being properly installed, the following are possible reasons:
a) Setting, Seasoning of the foundation.
b) Pipe strains, distorting or shifting of the machines.
c) Wear of the bearings.
3.8 Suction and Discharge Piping
When installing the pump piping, make sure to observe the following precautions:-
Piping should always run to the pump. Do not move pump to pipe. This could make final
alignment impossible.
Both suction and discharge piping should be supported independently and close to pump
so that no strain is transmitted to the pump when the flange bolts are tightened.
Use pipe hangers or other supports at necessary intervals to provide support. When
expansion joints are used in the piping system, they must be installed beyond the piping
supports close to the pump.
It is advisable to increase the size of both suction and discharge pipes at the pump
connection to decrease the loss of head from friction.
Install piping as straight as possible, avoiding unnecessary bends. Where necessary, use
45 degree or long sweep 90 degree fitting to decrease friction losses.
Make sure that all piping joints are air tight. Provide pipe expansions bellows when hot
fluids are to be pumped. Where reducers are used, eccentric reducers are to be fitted in
suction lines and straight taper reducers in discharge and vertical lines (See Fig.5).