ICGSMA Bulletin - Indian Coast Guard

ICGSMA BULLETIN (JAN - MAR 13)
Contents
Technology Savvy
1 Sustaining Expertise to Address
onboard maintenance of Modernised
Equipment
3 Super Cavitation
6 Use of Magnetic Pick up
Technical Experience
– Case Studies
7 Defect Rectification on STBD Main
Engine Control of ICGS Annie Besant
8 Repair of Main Engine
Exhaust Overboard Pipe
10 Defect Rectification on Idle RPM
on DA
CENTER COLUMN “Common
Paint Defect and Remedies” - Article
covers the problems which occur after the
painting--- C-153
SUSTAINING EXPERTISE TO ADDRESS
ONBOARD MAINTENANCE OF
MODERNISED EQUIPEMENT
Commander VR Maharshi
ICGS Samrat
1. The AOPV and PCV class of ship’s has
specialized equipment like integrated Bridge
system (IBS), integrated Automatic Machinery
Control Systems (IAMCS) and Pollution Control
Systems (PCS). The influx of modernized equipment
has ensured a level of comfort in operations
management and manpower resources. However,
maintenance challenges are expected to increase
in future if logistics management and cadre training
do not simultaneously keep pace with the
induction.
2. There have been three different cases that
have defined the technical challenges to the
maintainers onboard:-
(a) The PME was found to be
declutching in single engine regimes while
doing high RPM. The engine and gear box
parameters were found to be normal. There
were no alarms recorded in the Automatic
Integrated Machinery Control Systems
(AIMCS) panel.
(b) While starting AC, a significant dip
was observed in the ship’s main supply
voltage resulting in Navigation equipment
like Log, Echo sounder and ECDIS switching
off. A sudden dip in voltage is observed
when heavy machinery is switched on with
direct online starters or even auto
transformer starters. This should not have
been the case as the associated soft starter
should have ensured a smooth starting
cycle. The logical diagnosis pointed towards
a defective controller PCB that controls the
firing cycle of thyristors in the starting cycle.
An insight to trouble shooters 1