[cat60y]

Preparations before Dry-docking

1. Prepare Repair Specifications in advance for budgeting and inviting quotations
2. Pipe Lines
3. Structural steel renewal, for which plate thickness gauging may be required.
4. Overhauling of Mooring Equipment.
5. Special servicing requirements
6. Overhauling and testing of Cargo Gear ( cargo pumps if the vessel is a tanker)
7. Prepare Spare Parts
8. Plan and carry out Hold/tank cleaning/gas freeing before arrival
9. Check and confirm availability of special tools, instruments and manuals on board.
10. Confirm availability of drawings like Docking Plan, GA etc. on board.
11. Make a repair and maintenance list, create or obtain a drydock handbook if required, and assign responsible ship staff to their duties on the list. Divide staff into groups to oversee the work carried out by yard gangs.
12. All spare parts must be checked and repair items kept ready for use.
13. Previous dry dock reports should be studied and previous clearance measures noted.
14. Clean engine room tank top and bilges.
15. Prepare sewage treatment tanks, dirty oil tanks and bilge tanks.
16. Flushing of bilge lines is to be carried out prior to dry dock.
17. The oil-water separator filter element should be renewed and the system checked for satisfactory operation.
18. Minimum bunkers (Fuel Oil and Fresh water) and ballast carried.
19. All heavy weights secured prior to dry dock.
20. All tanks and cofferdams must be sounded and recorded.
21. Firefighting plans and safety measures discussed before dry dock
22. Firefighting equipment on board should be checked and kept ready for use.
23. Emergency lighting and generator should be tested before entry.
24. Escape routes must be clearly marked.
25. All valves and chests to be overhauled must be clearly marked.
26. Shore connections for cooling water and fire line are to be readied.
27. Main engine, generators, and boiler are changed over to diesel oil.
28. CO2 total flooding systems are secured and locked before entry.
29. Vessel must approach dock with even keel.

Management Involvement

• 1. Select repair yard based on vessel’s trading pattern.
  2. Invite quotations and negotiate prices.
  3. Issue instructions to Master/Chief Engineer regarding: Cargo/ballast/fuel oil quantity/distribution, Calculation of arrival drafts and trim, Fire/ Safety precautions.

Trouble/Damage if Dry Docking is Unprepared:

1. Dangerous confusion if no proper defects list is made and staff not briefed.
2. Explosion hazards when hot work is done on a tank not emptied of volatile substances.
3. Engine room bilges may become fire hazards if not cleaned.
4. If spares are not checked properly, work will be delayed due to time wasted finding or awaiting orders.
5. Leakage due to draining must be pumped to the empty drain/bilge tanks if not empty prior to dry dock.
6. Extra unplanned work needed in shore reception required in dry dock costs time and money.
7. Wrong frequency and power supply information given to dry dock will cause machinery to overheat and eventually fail.

Safety during docking

1. Firefighting equipment ready at all times.
2. Fire detectors and fire alarm in good working condition.
3. CO2 total flooding system door is locked to prevent accidental actuation.
4. Safety gear worn while working- safety shoes, helmet, overalls, safety goggles, ear mufflers, and gloves.
5. Escape routes should be clearly marked.
6. Proper working permits obtained before carrying any work on board; e.g. hot work permit, enclosed space entry permit.
7. All lifting gears checked to be in good working condition.
8. Safety lamps are used – never use a naked lamp.
9. Co-ordination of work, so no chemical cleaning and hot work around boiler area is done at the same time.
10. No transfer of oil carried out in dry dock.
11. No boiler blow downs; in emergency, necessary notice given.
12. Acetylene and oxygen bottles are properly stored and secured.
13. Fire officer at site of work and extinguishers available.
14. No unauthorized personnel or chemicals allowed on board.
15. Ship properly grounded to shore earth.
16. Fire line is always ready with 2 hydrants open if no hull work is carried out.
17. Safety meetings should be carried out every morning before stating the work in dry dock.
18. Warning notices
19. Fire line under pressure/ fire fighting appliances kept ready
20. Means of communications established
21. Usage of galley and WCs restricted as required.
22. Hot work permissions/precautions
23. Earthing of vessel
24. Escape route. Two fixed gangways, independent of each other.
25. Safety plan of the vessel available at gangways.
26. Suitable communication system and routine for alarm in emergency situations
27. Ship watch round regularly
28. Contact with fire-brigade ashore.
29. Water under pressure to the vessel’s fire-hose and sprinkler system.
30. Hot work permit
31. Fire watch at least during hot work plus two hours
32. Portable extinguishers and a connected fire-hose where hot work is performed.
33. Secondary fire alarm system where necessary
34. Debris contributing to fire load sent ashore
35. Fire-doors or WT-doors fully operational at all time
36. Gas free certificate

Inspections during Docking Survey

1. The shell plating is to be examined for excessive corrosion, deterioration due to chafing or contact with the ground and for undue unfairness or buckling.
2. Special attention is to be given to the connection between the bilge strakes and the bilge keels.
3. The clearances in the rudder bearings are to be measured. Where applicable, pressure testing of the rudder may be required if deemed necessary.
4. The sea connections and overboard discharge valves and cocks and their attachments to the hull are to be examined. 
5. The propeller, stern bush and sea connection fastenings and the gratings at the sea inlets are to be examined.
6. The clearance in the stern bush or the efficiency of the oil glands is to be ascertained.
7. When chain cables are ranged, the anchors and cables are to be examined by the Surveyor.

Activities In Dry dock

• Bottom Inspection/corrective action
• Bottom painting
• Anchor cable ranging and painting.
• Cleaning and painting of chain locker.
• Echo-sounder and speed log checks
• MGPS and ICCP checks
• Sea chests/filters cleaning/painting
• Storm valves overhauling
• Rudder pintle and jumping clearances checking
• Rudder pressure testing/internal painting if required
• Poker gauge reading (Propeller drop)
• Stern seal leak check
• Propeller polishing/repairs if required.
• Tail shaft survey, if required.
• Bottom plugs removal/re-fitting as required

Checks before/during Flooding in Dry Docking

• Sea connections, sea chests checking
• Bottom plugs fitting/leak test by vacuum
• Any other hull opening
• Removal of masking of anodes
• Securing of rudder fittings, propeller nut/cone fitting, rope guard and net-cutter fitting
• Ensuring ballast/weight distribution same as when docked
• After commencement of flooding, when the water level has risen enough to cover all shipside opening, flooding needs to be stopped and all ship side connections checked for any leakage. After confirming that all are satisfactory, flooding is resumed and the vessel floated.

quote: https://www.brighthubengineering.com/seafaring/77001-preparing-the-ship-for-dry-dock/

 

What is Dry Dock Survey ?

 

A  dry docking Survey is required in conjunction with the Special Survey to examine the external underwater part of the ship and related items.

Two Bottom surveys are required to be carried out during the five year period of validity of SOLAS Cargo Ship Safety Construction (SC) Certificate, and the maximum interval between any two successive Bottom Survey is not to exceed three years.

From 1 July 2002, for bulk carriers of 15 years of age and over, inspection of the outside of the ship’s bottom is to be carried out with the ship in dry dock. 

For bulk carriers less than 15 years of age, alternative inspections of the ship’s bottom not conducted in conjunction with the Special Survey may be carried out with the ship afloat. Inspection of the ship afloat is only to be carried out when the conditions are satisfactorily and the proper equipment and suitably qualified staff are available.

[icedcappucino]

For Chief Officer,

What are the plans that you will prepare prior to a docking survey? Contents of capacity plan.

10- Docking Plan, Plug Plan, General Arrangement, Shell Expansion, tank arrangement, Load Density Plans, Rigging Plan, capacity plan,
Fire Arrangement Plan, CO2 Plan,

3- stability booklet, repair list, certificates for renewal

Load density found in stability booklet

Capacity plan (5c,3d,t,g)
3.1 safety area
3.2 compartmentation
3.3 clearances
3.4 cubic spaces or volumes
3.5 capacities and arrangement of cargo gear
3.6 deck load capacities
3.7 data – miscellaneous
3.8 deadweight scale
3.9 trimming table
3.10 geometrical centres
1. ships particulars
2. no of derrick or cranes and SWL
3. no of winches
4. no of generators and output power
container capacity in terms of TEU

– stability, sound tanks
– job list
– work schedule/ rest hours
– upcoming surveys, preparation for them
– order spares, stores
– order technicians for any other jobs that might be required
– after alongside, remove lifebuoys and other LSA equipment if possible
– precautions in dock, general safety, emergency procedures

Chief officers jobs
Safety and organization of crew
Overall supervision of deck work list
Surveys

• This reply was modified 2 years, 3 months ago by icedcappucino.

[icedcappucino]

For Chief Engineer and Second Engineer,

This post will cover preparations for drydocking until entering.
Shipyard departments: Carpentry, Electrical, Hull, Marine, Mechanical, Piping, Electrical, Steel, Support service

Preparations before Dry-docking

3-6 MONTHS PRIOR
1. Repair Specifications (AKA “Docking Specs” etc)
Intro: This is a collection of jobs to be done by the shipyard, and usually prepared by the Chief Engineer to submit to Tech Supt/Vessel Manager for approval. Split into “Electrical” and “Mechanical” categories and numbered for easy reference during meeting. The shipyard will assign to their various departments accordingly. Note: DOES NOT include ship crew’s jobs. Make a separate plan for ship crew’s jobs to submit to the Tech Supt/Vessel Manager for approval.

How to prepare:
– Survey jobs (check what’s due i.e. Annual, Intermediate, Special, CMS survey items)
– Routine dry dock jobs (e.g. Large electrical motors for overhaul)
– Jobs not part of survey scope but crew is not able to carry out (e.g. Retrofit BWTS, corroded superstructure needing major cutting and welding)
– Check vessel’s or sister vessel’s past Repair Specs for reference (if available)

2. Reference materials to prepare:
A) Docking plan

* Especially important as Sea Chests, Echo Sounder and Speed Log Transducer will be cleaned/checked. CE and 2E must be familiar with all overboard discharge marks. Names and locations as given below:

B) Both E/R and Hull piping drawings
Especially important for checking specs for replacement of pipe spools, valves, etc.

C) Construction drawings (Structural steel renewal)

D) ALL machinery manuals
* Would be helpful to have a spreadsheet of all the machineries, maker, model, WEIGHT for easy reference by repair team!

E) Previous class survey reports (as applicable)

F) Previous clearance and measurements (especially major components such as stern tube wear down, main engine bearings clearance measurements etc)

G) All tanks, cofferdams and their capacities
Useful for planning tank cleaning (manpower, materials, manhours).
Various references available for this, such as Capacity Table (or “tank calibration” book)

Or Capacity Plan

3. Spare parts and special tools
A) Double check spare parts and special tools ROB (especially on old vessels or second-hand vessels where important special tools like wear down gauge might be missing)
B) Check the fleet management system for any expected deliveries before entering dock
– Don’t make double orders unknowingly, it’s troublesome to cancel and costly if delivered.
– Consider consumption and extra quantity in case of damage by human error during dry docking

4. Shore connection
– Check condition of Shore Power connection bus bar for rust, wear etc. especially for older vessels. Repair/order spares as necessary.

1-2 MONTHS PRIOR

1. Plan minimum bunkers (F.O, M.G.O, L.O, F.W) and ballast carried
A) Plan minimal safe top-up of M/E and A/E L.O to facilitate less wastage when engine overhaul carried out and crankcases are cleaned
B) Cross-reference with class survey status report + voyage plan to plan how much minimal amount to top up in each tank, to help facilitate transfers and tank cleaning in drydock (especially for F.O tanks, it’s a hassle)
2. Draw up list of items to offload for overhaul/repair (e.g. large electrical motors)
3. Plan and carry out hold/tank cleaning/gas freeing before arrival
4. Pump engine room bilge wells to minimum suction, and clean engine room tank top and bilges
5. Run O.W.S. to reduce bilge holding tank to minimum level to facilitate cleaning in drydock. Monitor working performance and report if unsatisfactory especially if old design, as rectification can be done easier during drydock.
6. Flush bilge lines thoroughly after O.W.S operation. Clean O.W.S and renew components (e.g. coalescers) as necessary, especially when expecting IOPP survey during drydock
7. Mark out all valves and sea chests strainers to be cleaned/overhauled
8. Measure dimensions of flanges for yard to connect cooling S.W. line (e.g. for A/C and refrigeration), and prepare blanks if necessary
9. Test Emergency Generator on load
10. Secure heavy loads
11. Prepare firefighting plans, safety measures, equipment and brief the crew
10. As appropriate, reduce sludge tanks ROB according to company’s instructions (e.g. shore disposal or incineration) and prepare them for cleaning

1 WEEK PRIOR
1. Take and record soundings of all tanks and cofferdam
2. Flush sewage treatment tanks and sewage treatment plant thoroughly, for easy shut down, cleaning and close inspection in drydock. Sewage and grey water will be disposed by yard during drydock.
3. Plan M/E, A/E and boiler changeover to D.O/M.G.O with adequate time
4. Same time plan for F.O and L.O purifiers to stop at the right time
5. Secure CO2 systems with lockout before entry into dock

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