Potable Water
Bunkering
1:36 PM
Potable Water
Bunkering
1:36 PM
Bunkering Process
MUNICIPAL SUPPLY ;
- DIRECT TO QUAY
STANDPIPE
- TO QUAY SIDE
STORAGE
TANK
VESSELL FILLED FORM
MUNICIPAL SUPPLY OR
QUAY SIDE STORAGE
TANK, TRANSIT TO
DELIVEY SITE
VESSEL
BUNKERS TO
OFFSHORE
LOCATION
VESSEL RETURNS TO RELOAD
VESSEL CONTINUES TO ADDITIONAL
DELIVERY SITES
.
WATER HYGIENE
RESTRICTED OPERATIONS
If you
SUSPECT
a contaminant has got into the
Water Network
Example
Sewage
Petrol
Diesel
Ground water
STOP WORK and Report to your SUPERVISOR
immediately!
Potable Water Bunker System
1:36 PM
Potable Water Bunker System
Keep Potable Water & Drill Water bunker lines separate.
Do not combine the two into one bunker station
1:36 PM
Potable Water Hose Caps – Good Hygiene
• Always recap bunker hoses
• Keep spares as a stock item in the store
1:36 PM
Potable Water Hose Caps - Corrosion
1:36 PM
Flushing Point
Potable Bunkering – Flush Overboard
1:36 PM
Potable Bunkering – Flush Overboard
Why Flush over board ?
• Ensures any stagnant water left in the hose and pipework is
flushed overboard.
• Ensures any stagnant water from the Supply boat lines is
flushed overboard
• Offers the potential to flush any loose Biofilm that may be
growing in the hose overboard
1:36 PM
Potable Bunkering – Flush Overboard
Biofilm
– Better to flush Bacteria overboard than into the tanks !
Bunker Hoses can be
an ideal breading
ground for bacteria
1:36 PM
Potable Bunkering – Flush Overboard
Biofilm
– Better to flush Bacteria overboard than into the tanks !
1:36 PM
Bunker Sampling
Bunker
Sampling
Point
1:36 PM
Bunker Sampling
Bunker
Sampling
Point
1:36 PM
Bunker Sampling
Bunker
Sampling
Point
1:36 PM
Bunker Sampling
Why Should you sample when Bunkering ?
• Good Practice
• Sampling should prevent system contamination from Diesel or Sea water
What Tests should be carried out ?
• Visual check for rust or other contamination
• Smell – for diesel contamination
• Conductivity for sea water contamination
• Free Chlorine – to check whether water requires chlorination post bunkering &
to make sure you are not getting super chlorinated water.
Sampling & Testing MUST be carried out before transferring water
to the storage tanks
1:36 PM
Bunker Water Chlorination
1:36 PM
Bunker Water Chlorination – Automatic Dosing Units
1:36 PM
Bunker Water Chlorination
Measure Free chlorine value pre bunkering and dose as required
Manual & Automatic Dosing will depend
• on the strength of the hypochlorite being used -> Age of the product
• Bacterial Contamination of System & Bunker Water
• Chemical contamination of System & Bunker Water – Rust , Nitrate, Ammonia
• Expect to Double Dose as a minimum i.e. use calculation to work out dosage for
1ppm as bacteria, contaminants & loss of strength will affect final outcome
1:36 PM
Bunker Water Chlorination
Bunkering always need More chlorine than expected due to
•
Aeration from pumping
•
stir up sediment
•
contact with contaminated walls, ladders etc
Expect to Double Dose as a minimum i.e. use calculation to work out dosage for 1ppm
1:36 PM
Manual Chlorination – Water maker & Bunkering
Dose into the tank when the tank is about 1/4 full to allow
the water to mix
If dosed via the sounding tube, Flush the sounding tube with
roughly 4 to 5 litres (1 gallon) of potable water to prevent
corrosion.
1:36 PM
Dosing Spread sheet – Theoretical !
1:36 PM
Written Bunkering Procedure – Good Practice
Safety precautions to be taken
Step by step procedure including flushing, sampling & testing
Include rejection criteria
e.g smell or taste of diesel , high conductivity, solid material etc .
1:36 PM
