Dry Docking Flashcards
Procedure start to finish, full overview? Preparation and docking?
1) Non essential gear is removed from the vessel.
2) Supply the dock superintendent with:
i) The vessels docking plan;
ii) The vessels’ tank plug plan;
iii) Details of any underwater fitting that may cause an obstruction.
3) Have repair list ready and send to the dock superintendent and any contractors.
4) Have work plan ready for vessel’s staff.
5) Ensure surveyor(s) are informed.
6) Inspections are carried out by dock superintendent, and they are
informed of any special requirements.
7) Rudders, stabilizers, propeller shafts and retractable propulsion units are in
docking positions.
8) Retractable hull fittings and transducers are in docking position.
9) Cranes and davits are properly stowed to prevent their movement.
10) The anchors are secured.
11) All moveable weights are secured.
12) Tie down chains and strops are in good condition and adequate for the
purpose.
13) Bollards and fairleads are clear and ready for use.
14) Adequate mooring lines are ready for use, and winches/windlasses are tested.
15) Guard rails and chains are intact and in good condition.
16) Access (gangway or stairs) has been arranged for the vessel once out of the
water.
17) Have copies of fire plans ready and ensure vessels’ fire prevention and
control equipment is in good order. Shore supply to the fire mains has
been arranged for when the vessel is out of the water.
18) Electrical shore supply has been checked for compatibility (voltage, current,
frequency and phasing) and has been arranged.
19) Required services have been arranged, such as:
i) Sewage and waste water disposal;
ii) Machinery cooling water (alternators, boilers, fridge plant etc);
iii) Shore-side storage for fridge stores;
iv) Ship-shore communications (phone lines etc).
20) Ensure the vessel is in a stable docking condition:
i) Correct draft and upright;
ii) Trimmed by the stern;
iii) Any tank transfers completed;
iv) Tanks either full or empty (depending upon survey or
maintenance requirements);
v) Avoid slack tanks to remove any free surface effect;
vi) All tanks manually sounded, and results logged.
21) Bilges have been pumped and are empty.
Walk through hull inspection from bow to stern?
- Check the paint condition, waterline condition, sea growth
- check the bow and bulb for damage - Pounding
- Check anchors and chains for corrosion and wastage is not greater than 11%. look for cracks and defects
- Check bow thruster and tunnel
- Check anodes
- Check underwater lights
- Check speed log, depth sounder
- Load line markings
- Check stabilisers
- Check sea chests
- Check keel
- Check ship side valves
- Check cathodic protection
- Check stern tube seal and bearing
- Check shaft for pitting
- check propellor, looking for cavitation, damage, pitting, erosion, stress corrosion. If CCP check seals
- Check boss nut
- Check rudder condition
- Check rudder stock and seals
- Check rudder stops
- Check rudder drain plug
Safety aspects of fire main, shore power, surveyor in attendance, hull inspection?
International shore power connection for the fire main, allows local fire departments to assist.
Ensure the yard can facilitate your power demands to provide lighting, fire fighting onboard
Lloyd’s surveyor is available for attendance to complete hull inspection while wearing correct PPE
How would you go about planning?
Discuss with the ship owner, management, Classification and ship yards to find a place and for how long
Decide what works need to be done prior to ensure contractors and parts will be available
Ensure they shipyard has the docking plan so no equipment under the water get damaged
The vessel is in the lightest ship possible
Explain what is in a bottom inspection?
A bottom inspection is inspecting every pieces of equipment under the hull from bow to stern.
What to do in the event of damage being found?
In the event of damage being found then the inspection team being the C/E, Owners rep, Project Manager and Surveyor will have to discuss, investigate and rectify the outcome in way that will allow the vessel to comply with class still.
Prior to flooding inspection? Who is present?
The C/E and Dock Master shall walk the vessel, ensuring the dock is clear and everything under the vessel has been removed or fitted. Master then signs
Dock bottom inspection, name all parts of the ship?
- Check the paint condition, waterline condition, sea growth
- check the bow and bulb for damage - Pounding
- Check anchors and chains for corrosion and wastage is not greater than 11%. look for cracks and defects
- Check bow thruster and tunnel
- Check anodes
- Check underwater lights
- Check speed log, depth sounder
- Load line markings
- Check stabilisers
- Check sea chests
- Check keel
- Check ship side valves
- Check cathodic protection
- Check stern tube seal and bearing
- Check shaft for pitting
- check propellor, looking for cavitation, damage, pitting, erosion, stress corrosion. If CCP check seals
- Check boss nut
- Check rudder condition
- Check rudder stock and seals
- Check rudder stops
- Check rudder drain plug
Rudder pintle and jumping clearances?
Rudder pintle is 1.5 mm for new builds and 6mm for operational
What are the Anchor chain tolerances?
Wastage no greater than 11%
Procedure for replacing hull plating?
- Assess the extent of the damage
- Prepare the area, PTW
- Remove items or fluid inside plating
- Remove damage area
- Prepare and fabricate new plating
- Install new plating
- Inspect welds
- Prepare surface and coat
- Test and inspect
- Document and report whole job
Rudder, what is the purpose of the pinntle?
Protection from running aground and minor
support.
What supports the rudder?
Palliser bearing
On a CPP what would you be checking?
- Any damage, corrosion, erosion, stress corrosion, cracks.
- Any seals leaking hydraulic fluids
- Full movement of Blades
How often should you dry dock? Other reasons to go dry?
On all intermediate surveys which is between year 2 and 3 of classification and then on year 5.
If you have grounded or a collision or there is a machinery failure which requires to be out the water
