General Drydock

Question 1

Prep for drydock

Answer 1

1. Make a repair and maintenance list, create or obtain a dry-dock 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.
2. All spare parts must be checked and repair items kept ready for use.
3. Previous dry dock reports should be studied and previous clearance measures noted.
4. Clean engine room tank top and bilges.
5. Prepare sewage treatment tanks, dirty oil tanks and bilge tanks.
6. Minimum bunkers (Fuel Oil and Fresh water) and ballast carried.
7. All heavy weights secured prior to dry dock.
8. All tanks and cofferdams must be sounded and recorded.
9. Fire fighting plans and safety measures discussed before dry dock
10. Fire fighting equipment on board should be checked and kept ready for use.
11. Emergency lighting and generator should be tested before entry.
12. Escape routes must be clearly marked.
13. Shore connections for cooling water and fire line are to be readied.
14. Main engine, generators, and boiler are changed over to diesel oil.

Question 2

Before flooding

Answer 2

oSound round all tanks. The soundings to be same as the initial soundings when the ship landed overall.

oCalculate the stability. The stability must match with the initial stability condition when the ship landed overall.

oAll the plugs are in place and pressure tested.

oGrease removed from the transducer points.

oAnodes.

oShip side markings

oAnchors heaved up.

oPaint dried up.

oScaffoldings removed.

oPropeller and rudder are clear of any obstruction and cover

Question 3

Enclosed Space Entry information

Answer 3

COSWP
Ch 4 emergency drills
Ch 15 entering dangerous spaces

SOLAS Ch 11 atmosphere testing

Question 4

Equipment for Testing Atmosphere

Answer 4

Manufacturers operating instructions
Kept in safe place
Properly calibrated
Serviced 
Calibration and service records maintained

Question 5

What must atmosphere equipment test for

Answer 5

Oxygen
Flammable vapours
Carbon monoxide
Hydrogen sulphide 
Toxic gases appropriate for ships trade

Question 6

General precautions

Answer 6

1. All enclosed space access doors, hatches, manholes
2. Potential hazards have been identified, isolated and made safe
3. Ventilated
4. Atmosphere tested
5. Illuminated
6. Communication
7. Sentry
8. Rescue and resuscitation equipment
9. PPE
10. Permit to work

Question 7

Atmosphere readings

Answer 7

21% oxygen
Not more than 1% of LFL
Not more than 50% of occupational exposure limit
Carried out with ventilation stopped

Question 8

Examples of dangerous spaces

Answer 8

Cargo pump rooms
Hold and cargo spaces
Double bottoms
Fuel tanks
Sewage tanks
Chain lockers
Void spaces
Battery lockers