Saturday, October 26, 2013
DRY DOCKING
·
the major event
·
preparing the vessel for the next 30 months
·
cost
DRYDOCKING MAINTENANCE
ALTERNATIVES
·
crew
·
traveling squads
·
shore assistance
·
compare with shipyard
·
heavy work involving high lifts
transportation
·
lowest cost
DRYDOCKING SPECIFICATION (most important document)
·
terms/conditions
·
description of all jobs
·
compiling the specifications as
early as possible
DRYDOCKING SUCCESS
FACTORS (knowing the vessel)
·
good and complete specification
·
planning
·
controlling the yard
·
adequate resources
DRYDOCKING THE SUCCESSFULL
DD
·
the specification to cover between 80-90%
of all work
·
no major extra cost
·
within the stipulated time and estimated
cost
DRYDOCKING PREPARATION FOR
ENTRY
·
vessel to be free for hot work and
enclosed places to be ventilated as required
·
bunkers / f.water / ballast etc. be suitably distributed to achieve suggested trim.
·
works in specification identified / marked.
·
supervision duties decided and agreed to.
DRYDOCKING SURVEYS
·
a list of all items to be surveyed
is kept ready
·
list of all certificates expiring
is ready
·
list of conditions of class to be
dealt with is clear
·
list of new applicable regulations
to be attended to is available.
·
modifications /fabrications if any
as per new regulations should already
·
be in the scope of repairs
·
liase with the surveyor and agree
on the scope of inspections / duration of inspections.
·
to keep surveyor informed about the
docking surveys and get a list of recommendations at the earliest for
completion of statutory certificates.
·
get surveyor’s approvals for the
scope of repairs involving class.
PRE
DOCKING SURVEYS
•
get the gauging reports verified and establish the scope of steel repairs.
•
agree with surveyors’ action plan for crediting of cargo /ballast tanks for (intermediate/special) surveys
•
agree on testing procedures / repair procedures if any and press test of tanks
as per requirements.
•
it is advantageous to plan to credit all tanks prior to docking, the trading
pattern permitting.
•
to credit max possible CSM items prior to docking.
DRYDOCK
WORK SCHEDULE
• ship staff and yard jobs are
clearly understood / planned and carried out without interference
•
yard jobs (in process and completion and testing) are properly supervised
•
spares supplied to yard by vessel / arrival of new spares etc are properly recorded and monitored
•
decision makings are properly delegated
•
onboard timings are suitably altered to get max productivity.
•
shipboard meetings are properly timed to continously monitor the situation.
•
repair teams if any are to be properly utilised and effectively monitored
dry
docking safety
•
safety meetings involving yard and ship staff to be properly timed and well
attended
•
violations of yard guidelines are to be strictly discouraged (hotwork in engine
room etc.)
•
tank entries etc. are to be done strictly according to procedures and personnel to be doubly careful while closing
openings
•
importance to be given to attire.
•
extreme care to be exercised while turning engines/operating steering gear/starting blowers/switching on electrical
breakers/prior trials etc.
•
systems are to be properly deactivated and rendered safe (depressurise hydraulic lines/empty oil lines/drain sea water lines etc)
•
boundaries of fuel oil tanks are properly marked
•
the tank drain plugs are properly marked / identified and protected from
inadvertant opening.
•
frame nos are suitably marked on deck/sides and bottom.
•
vent pipes are suitably marked/identified.
drydocking
economy
•
repairs done through afloat workshops are always cheaper
•
most of the specialized jobs are done
thru subcontractors or representatives of OEMs with a surcharge.
• a
repair team will always be cheaper if the materials can be organized cheaply.
•
you will loose a fortune if you need to do tank cleaning inside a yard.
•
all additional work will be charged at a very high rate.
•
the smaller the fabrication jobs/steel jobs on deck--the more uneconomical it becomes.
• quantities of steel work/pipe work/hull painting etc are to be determined
with respect to conditions in tariff like
• minimum kgs per location
•
minimum meters per location.
• charges for inway and access work
• minimum surface (blasting)
• minimum no of points per location
(gauging)
•
WATCH OUT FOR THESE DANGER AREAS
pipe clamps
transport to workshop
machining/fabrication items
cleaning
ventilations / bilges / services.
• it
would be cost effective to take a quote for the following
- unshipment of rudder
- renewal of carrier bearing with yard
material
- renewal of pintle bearing with yard
material
- standard tariff for o’haul of motors (kw
basis) /pumps (kw basis)/pipes (meter basis)/
testing of pipes (meter basis) /testing of welds
(meter basis) / supply of skilled and unskilled
manpower (hourly basis) magnaflux / radiography and other tests
/ staging (tower and block/buildup of
pits/reweld bottom plates
• best economy is an outcome of a tight
specification
drydocking commercial
the following important aspects are covered by the contract document
• time of completion
• discount offerred
• penalty clauses
• repair specifications
• repair specifications
• payment schedule & redelivery
of vessel
• owners rights
• yards responsibilty and
limitations
• guarantee
• engagement of subcontractors and
surcharge.
• work done certificates
• authority and owners
representative
• cancellation clause / terms
• facilities to be provided to owners representatives
• change of scope of repairs
• spares and stowage
• pilotage tugs etc for shifting for yards convienience
• the owners enquiry contains the
conditions of the owners
• the yards offer contains the yards
rules and conditions
• the conditions in the yards offer stand
valid even if they are
contradictory to
owners request once the vessel has been
stemmed
• the areas of contradictions are to be
agreed upon / thrashed out prior stemming the vessel.
drydocking
technical - corrosion protection
anodes
- choice of the correct type and
quantity of anodes.
- replenishing of electrodes for
impressed current systems if fitted.
- protection of anodes while painting
- correct placing of anodes under guidance from supplier.
- removal of old anodes
drydocking
technical
• steel
work
- inspection of weld quality / fitups
- keep track of the dimensions and
locations (for commercial reasons)
•
- bush clearance
- drop
- sealing 0 rings for the taper
surface of the pintles
- proper cementing of palm bolts
- water box closing plate water
tightness
- jumping bar /clearance
- key ways
•
- push up and
pull up hydraulic pressures (push up curve)
-
key ways
- polishing
•
- gauging
and reversal if reqd
- cleaning of chain locker and insp
• HULL
- gauging of stiker plates
- build up of pits
- wee out/gouge and build up weld seams
of bottom plates
- inspection of drain plugs
drydocking
technical (machinery)
•
cleaning of coolers and heaters
•
o’haul of large electric motors
•
balancing of rotating equipments as reqd.
•
o’haul of machinery as reqd
•
recheck alignments of machineries if disturbed.
•
remove deficiencies in automation and control equipmen as reqd.
drydocking
instrumentation and navigating equipments
•
callibration of electrical switchboard meters/other electrical and mechanical measuring devices
•
o’haul of main breakers and callibrating safety trips.
•
rectify deficiencies in navigating instruments
•
rectify deficiencies in safety systems if any.
drydocking
prior flooding(important items prior flooding)
- all
tank drain plugs are inspected and vacuum
tested after fitment
- all anodes are functional
- sea chest gratings etc are secured
- correct ballast is taken.
- inspect rudder (water box) / propeller /rope/ guard
- all cargo/ballast tanks are clean from remnants of steel work
- cargo lines etc pressure tested / pumps are tried out
- all tank valves (if remote operated) are tried out
- hatch covers etc and other type of cargo gear are tried out and properly secured
- all sea chests are properly purged of air
- all equipment in engine room are tried out
- main engines/boilers are preheated and ready for trials
drydocking
sea trials
• sea trials
- engines are run to required speed,
movements are checked.
- steering is confirmed to be performing
satisfactory
- stern tube oil is checked for
maintaining level.
•
