This document summarizes the rotor lifting process of a 3700kW, 47-ton motor with Siemens bearings. Key steps included removing the drive end side journal pads, lifting the shaft with a 100-ton jack, removing the non-reverse ratchets, NDE side housing, thrust runner lock, journal pads, thrust runner, thrust pads, air duct, and finally lifting the rotor. Important considerations for lifting included using calibrated instruments, certified lifting gear, and supporting the motor manufacturer's recommendations.

1. Rotor Lifting of Cooling
Water Motor
By Muhammad Faisal Nadeem

2. Motor Data
 Siemen Motor 3 Phase ,400 V ,Total Weight of Motor 47 ton with coolers
,3700kW, Pf=0.9
 DE and NDE SUND China Bearings

3. Bearing Reference codes

4. DE End Side bearing SMD bearing
 First loose the Drive end Side all Journal Pads and measurement were noted
 Place the Jack(100ton) under shaft for supporting the 15 ton , lift not
exceeded 0.50mm as recommended by Manufacturer

5. 1.Non Reverse Ratchet
 Non-reverse ratchets at the top of motor prevent pump backspin when the power is
off and the column of water falls through the pump impeller. Depending on the well
depth, backspin can reach dangerous speeds if unchecked. As the water level falls, it
leaves the water-lubricated pump bearings without lubricant.
 Two common types of non-reverse ratchets are ball ratchets and pin ratchets, both of
which work on the same principle.

6. 2.NDE Side Housing Removal
 Remove side housing at top of NDE bearing housing

7. 3.Removal of Thrust Runner Lock

8. 4.Journal Guide Parts
 Guide pads are made of mild carbon steel (C20), with the working surface casted with tin based
Babbitt ZSnSb11Cu6.
 SM and SMZ series bearings are designed with clearance adjustable tilting pads as standard, and
the assembly clearance can be adjusted by a SUND independent patented fine-tuning device
with scale, which makes installation and maintenance easier.
 During the procedure of trial running and installation, stiffness and damping characteristics of
guide pads can be changed by adjusting bearing assembly clearance, so as to change the critical
speed of the system to achieve better system stability.
 Always mark all the scale dimensions and note down the readings before removing the Journal
pads
 Total number of Journal Pads are 8
 Check for any marks or rubbing on the Journal pads, Journal pads are provided to keep the shaft
in Coaxial direction

9. 4.Journal Pads Pictorial view
NDE Journal Housing Removal

10. 5.Thrust Runner
 The runner, usually made of forging medium carbon steel, is connected to the
shaft by a tight shrink fit or by an SUND patented clearance eliminating device
to achieve effective connecting.
 Always Use good hydraulic Jack(50 ton) and high strength Plate for removing the
runner, Use of hammer also

11. 5.1Thrust Journal Pads
 SUND vertical thrust bearings are the round circular thrust pads made of mild
steel ( C 20), with the working surface made of tin based Babbitt ZSnSb11Cu6
to reduce surface wear.
 These circular pads are supported by disk springs which ensure an
equalization of load distribution, thereby eliminating the trouble of manually
scraping caused by traditional rigid supporting structure.
 it is easier and simple in installation and maintenance, also more reliable in
operating.
 With springs, this kind of vertical bearing can effectively absorb the shock
load, therefore its stability and impact resistance are higher than the
traditional bearings with rigid supporting pads.
 The thrust pads can automatically adjust its angle as per running condition,
so, they are also tilting pads and have the advantage of tilting pad bearings.

12. 5.1Thrust Pads of bearing
Total Number of Thrust pads=12

13. 6.Air duct Removal
Carefully remove the air
duct which contains Thrust
Pads parts

14. 7.Rotor Lifting

15. 8.NDE Bearing SMZ Dimensional Drawing

16. 9.NDE SMZ16-320-9 Bearing Dimensions

17. 10.Cooling Water flow Quality

18. 11. Bearing Selection for Vertical Motor
from SUND
 Before selecting the proper vertical thrust bearing, please input the
following information:
 Type of machine and application
 IP grade
 As standard: SM 、SMD IP55
 SMZ IP55
 SP IP42
 Maximum diameter in the mating site of shaft and runner
 Rotation speed (normal speed and maximum speed )

19.  Thrust load downward and upward (normal, start-up and maximum)
 Radial load
 Parameters of lubricant
 Others ( e.g. painting, temperature measurement, cooling water quality)

20. 12.Highly considerable Points before
lifting
 All Lifting gears, belts and Shackles should be third party tested
 All instruments used for measuring bearing dimensions should be calibrated

21. Special Thanks to
 Plant Management HEI , Plant GM Mehdi Hassan Bhatii sb, Sarwar Sheikh MM,
Imran Akbar MM and Hamid Javed Electrical Manager for kind support
 Ustad Hameed and Utsad Illyas Both techs are highly educated and utilizing their
experience power, this rotor lifting happened