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

1:36 PM

•

Introduction

•

Potable Water Bunkering

•

Water makers

•

Storage and Distribution

•

Back Flow & Contamination

•

Chlorine Disinfection

•

UV Disinfection

•

Ship Yards

•

In field testing methods