Intze Overhead Water Tank Design by Working Stress - IS Method.pdf
SVL-Singapore
1. SVL SINGAPORE SERVICES
RAJAGOPALAN. J
Pre-docking inspections with Infrared Thermal Imaging,
Ultrasound and Vibrations analysis as Cost Saving tools
for Marine and Off-shore Industry
2.
3. Do you want to save cost for docking repairs ?
Do you want a Road–map of what machineries are to be
opened up and need not be opened ?
Do you want to justify your Managers or Owners the
reasons for taking up a job in the dock or not taking up ?
Do you want a Management takeover vessel inspection ?
OUR INSPECTIONS ARE IDEAL TO ACHIEVE ABOVE
Do you want an economical Class approved CBM system ?
WE CAN SET IT UP FOR YOU
4. These inspections are essentially Predictive in
nature. Conducted with Non-intrusive Technologies
such as Infrared Thermal Imaging, Ultrasound
Detection & Vibration measurements.
Thermal Imaging: With the Thermal Signature, we
can see the Infrared Radiation which we can not
see otherwise
Ultrasound: With Ultrasound machine, we can hear
the High Frequency sound which we can not hear
otherwise
Vibration survey: Vibration signature shows the
physical movement of the machine indicating the
health condition of the same
10. SOLAS VIOLATION OF EXPOSED HOT SURFACES
In one case Ship owner had to spend 8 mil Us$ to repair fire
damages
11. One ship has a Max Temp of
102 Deg C at part load
whereas the sister vessel
shows 71.2 Deg C at Full pitch
Bow Thruster Analysis for Maersk
14000 TUE Container vessel
12. Bow Thruster Breaker Tracking –Corona
Noise
From No1 Bow Thruster: Breaker to
Overhaul
13. No1 Main Lub oil Pump – 6.6 KVA
• The stbd side lub oil pump in operation.
• Terminal box noise measured by Ultrasound
• This is some metallic noise coming out of the terminal box.
• Recommended to open the terminal box and check the
connections.
• From air outlet it is noted the carbon dust appearing and
recommended to limit the greasing to bearing maker
recommendation (usually 3 shots per month) and observe after
12 months
• All black dust emissions to be cleaned to observe the motor
windings and grease effect.
14.
15. COUPLINGS AND SHAFTS ALIGNMENT
Couplings inspection is difficult in normal operation.
This is how misalignment looks like I Infrared.
Note the Heat on the Motor Inboard Bearing and the coupling Rubber
This Machine will not last long under obvious misalignment
Hot Spots
17. A Typical Motor Bearing Problem
Before & after repairs, Temperatures were found same
18. Port Side Vent fan Junction box
in Main Switchboard
This could be catastrophic failure on a tanker. This can cause
fire in main switch board
270 deg C
Max
21. • steam traps stuck (open)
position:
- waste of energy and
damage to atmosphere
condenser.($$$)
- excess steam in system
• steam trap stuck in shut
(closed) position:
- water hammer
- line clog and corrode
- possible rupture
cause and effect of
failed steam traps
Failed steam trap
26. Arc Flash Conditions
Tracking
The main concern in low
voltage systems
Destructive dielectric
breakdown that results in a
fault in the insulator.
Arcing
34. Main Sea water pump No.2 Vibration Signatures
1. The Total vibration in Radial direction is 3.637 mm/s RMS. and
in Axial direction 2.158 mm/s RMS.
2. The DNV standard for satisfactory running pump is 7.0 mm/s.
3. This pump is running in satisfactory limits.
4. The vibrations identified at sub synchronous and sub harmonic
ranges not serious but the initiated wear down at bushes and
wear rings.
5. The impeller is found to be in good condition.
6. The pump an run for another 2 years without any problem
however, vibration analysis to be done after every one year
period.
40. 41. No 1 ER Blower 22kw 1175 rpm
Bearing/ position Overall Overall (Readings)
Mm/Sec RMS
Condition
assessment
1 2 3 4
1.1 Motor Top NDE
H
X 1.3575 1
1.2 Motor Top NDE
V
X 1.4508 1
1.3 Motor Top NDE
A
X 0.09909 1
1.4 Motor Bot NDE
H
X 2.2038 1
1.5 Motor Bot NDE
V
X 2.3867 1
1.6 Motor Bot NDE
A
X 0.8464 1
Ref. Bearing/ position Overall Overall (Readings)
Mm/Sec RMS
Condition
assessment
1 2 3 4
1.1 Motor Bot NDE
H
X 3.1818 2
1.2 Motor Bot NDE
V
X 4.7054 2
1.3 Motor Bot NDE
A
X 1.8905 1
1.4 Motor Top NDE
H
X 2.1979 1
1.5 Motor Top NDE
V
X 1.8181 1
1.6 Motor Top NDE
A
X 4.1555 2
No1 ER Blower
No2 ER Blower
With above Vibration measurements, there is
no need to overhaul these blowers
