C . O . W.CRUDE OIL WASHINGSpecialised Tanker Safety CoursePresented by GROUP - 2

C.O.W. Presentation

Our requirement is to perform C.O.W, complete discharge and prepare for sea.This requires careful planning and risk assessment to be carried out in following stages:

PLANNINGPRE ARRIVAL

BEFORE C.O.W.

DURING C.O.W.

AFTER C.O.W.

HOW TO PERFORM C.O.W.Information on how to perform the Crude Oil Washing operations is detailed in:

The IMO publication on Crude Oil Washing Systems andVessels approved Operations and Equipment Manual provided by the company.

PRE - ARRIVALCrude oil washing is carried out while the cargo discharge is in progress towards the end.Obtain permission from terminal 24 hours prior arrival at discharge port.Test run the Inert Gas (I.G) plant as this is a must as per regs for darrying out C.O.W.Check all alarms on the I.G system and set Oxygen alarm to 5% ensure availability of this quality of oxygen so that at the tanks it is less than 5%.Test cargo pump emergency trips and low I.G pressure trips.

PRE ARRIVAL contdEnsure tank cleaning heater is blanked off.Close all valves to tank washing machines and pressure test C.O.W lines and check for leaks.Check proper operation of:- Pressure gauges- Tank gauging system- Communication equipment- Portable instruments.

BEFORE PERFORMING C.O.W.Having completed all pre arrival checks, complete the ship/shore safety check list.Ensure all members of COW team briefed including shore team and plan available.Ensure communication link established and tested between ship and shore.Establish and agree upon abort procedures for COW

Before C.O.W.. ContdEnsure positive IG pressure in all tanksCheck oxygen content below 5%Set and align all valves and pipelines required for the tank concerned.Ensure gauges in tanks are secured to avoid damage.Set required washing pattern on the machine.

Before C.O.W contdEnsure responsible person in attendance through out the operation.Soon as the operation is commenced confirm that there are no leakage in the systemThe COW oil shall be free of any water content. This should be ensured by discharging the 1st 1 metre of each supply tank.Slop tank is to be crude oil washed first.

During C.O.WMonitor I.G frequently.Monitor The COW machine and associated lines and system frequently for any leaksPump room under constant vigilanceAscertain the designated tanks are being COW.Maintain a pressure of about 9.5 10.5 kg/cm2Monitor the cycle duration as per COW manual

During COWContinuously monitor the tank atmosphere to ensure in safe rangeEnsure adequate stern trim to facilitate bottom washing.Essential to continuously monitor level of slop tank to prevent over flow during educting.

AFTER COWUpon completion of COW drain all lines.Close all the tank cleaning machine valves.Strip all lines, pumps and tanks as per manual.Complete entries in the Oil record book.

Any questions?

Thanks for your attention!Presentation by Group 2