ICGSMA Bulletin - Indian Coast Guard

ICGSMA BULLETIN (JAN - MAR 13)
down to idle RPM, de-clutched and subsequently
both engines were shut down for defect
investigation and rectification.
DEFECT DIAGNOSIS
An earth fault indication was observed on
battery rectifier fitted in aft engine room. The
following checks were undertaken by the ship staff.
(a) Battery was removed from the system and
checked for earthing.
(b) Charger out put was disconnected from the
system and checked for earthing.
COMMON PAINT DEFECTS AND REMEDIES
(DO YOU KNOW?)
WRINKLING - Wrinkling happens when the paint
forms film-like undulating waves. Applying too much
paint or drying during high temperatures or painting on
a topcoat before the undercoat is dry can cause this
defect to happen.
SOLUTION - Avoid applying too much paint. Make
sure no paint accumulates around bolts, rivets, etc.
Wait until each coat dries before you re-coat.
from sensors on stbd Gear Box were disconnected,
the earth fault indicator was disappeared on the
panel. On investigation, the earth fault was
detected on stbd Gear Box terminal box (X-20)
ahead/astern solenoid plug card( CA3106), which
is fitted on Gear Box. During checking, plug card
was found defective and grounded with body.
Finally defect was liquidated by ship’s staff on
30 Jan 13 post replacement of new plug card from
OBS . The cold checks were carried out and found
satisfactory. Stbd Main Engine was started for trials
and all parameters found to be working
satisfactorily.
LESSON LEARNT:
(a) Follow up the defined procedure for
assessment / identification of defects.
(b) Ensure sensors cables and plug cards are
properly secured and protected from physical
approach.
A CASE STUDY- REPAIR OF MAIN
ENGINE EXHAUST OVERBOARD PIPE
(c) All terminal strips were checked for any
grounding of cables in MCR and LOP.
(d) All incoming and out going cable from sensors
in main engine room LOP were disconnected one
by one.
(e) All control PCBs were removed and checked for
earthing.
(f) All power supply incoming breaker (24V DC)
were switched off one by one.
(g) Earthing in RCS terminal strips was checked.
(h) Earthing in remote and local mode was
checked.
(j) All incoming and outgoing cables from sensors
on Gear Box were disconnected.
The moment incoming and outgoing cables
ICGS Annie Besant
1. Ship is fitted with two main engines Make:
MTU Germany, Model: 12 V 538 TB 82.
2. Ship’s both main engines exhaust over
board pipes were corroded and holed at
various places and sea water/exhaust smoke
leakage was observed through both the
exhaust pipes. Due to operational commitment
the defect was taken care by affecting cold
repair by the ship’s staff. Meanwhile joint
inspection was carried out by local firms and
the ship’s technical staff. The condition of the
pipe was found to be alarming view excessive
deterioration and position of the pipe, near the
water line.
An insight to trouble shooters 8