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
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Measuring free chlorine
1. Rinse out the two vials with water to be tested
2. Fill both comparators cells to approx. 10ml mark
3. Add the contents of one DPD(free) powder pillow to one vial
4. Cap and invert gently to dissolve
5. Place this comparator cell into the right hand side of comparator
6. Place the other comparator cell into the left hand side of the comparator
7. Hold comparator to a source of light (preferably natural light)
8. Rotate disc until colour match is obtained
9. Read of the value on the right aperture of the comparator
10. Record result.
Reading must be taken within 1 min of adding the sachet
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Temperature Measurement
• Cold water temperature – within 2 minutes
• Hot water temperature – within 1 minute
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Cold & Hot Water TVC (Quantidisc)
• Measures background bacteria
• Shows the conditions of the water
• Sterile process
•
Theoretical Scale
• 40 hours
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1:38 PM
Cold & Hot Water TVC (Quantidisc)
Cold & Hot Water Ecoli & Coliform
•
Positive or Negative Test
•
Sterile Testing required
•
24 hours
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Recommended Sample Matrix
Conductivity,
Visual
Inspection
pH.
Conductivity,
Free Chlorine
Temperature
TVC
Quanti-disc
E-coli
Coliform
Disinfection Flushing Volume Inspection
Laboratory
Chemical
test
BUNKERED
WATER
Each Time
Weekly
SICKBAY COLD
Daily
Daily
Weekly
Monthly
SICKBAY HOT
Daily
Weekly
Monthly
GALLEY COLD
Monthly
Monthly
Monthly
Quarterly
Annually
GALLEY HOT
Monthly
Monthly
Quarterly
Annually
OTHER LEVELS
COLD
Quarterly
Quarterly
Quarterly
OTHER LEVELS
HOT
Quarterly
Quarterly
LITTLE USED
OUTLETS
Weekly
SHOWER
Monthly
CALORIFIER
DRAIN
Weekly
Annually
STORAGE
TANK
Annually
OWM Daily Monitoring Spreadsheets
OWM Monthly Review Sheets
Group Exercise 2
Lets see if you have listened
1:38 PM
Practical Exercise 1
The following techniques will help you
interpret Quanti-Disc results correctly:
1. Read the Quanti-Disc sample with
a viewing cabinet or in a dark room
to avoid ambient light interference.
2. Read Quanti-Disc results with
a 6-watt, 365-nm UV lamp.
3. Keep the UV lamp at least 5 inches
(13 cm) from the disc. If the UV lamp is
too close, every well in the Quanti-Disc
may appear to be positive.
4. Count the number of fluorescing wells.
Any fluorescence visible within a well is
considered positive. Refer to the MPN table
to convert positive wells to MPN per mL.
5. Do not compare wells within the
same sample. Always use a negative
control for a reference.
Quanti-Disc
Reading Guide
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Practical Exercise 2
•
Chlorine Testing
•
pH Testing
•
Conductivity Testing
•
Hygiene Testing
Not a test – Have a play with the equipment
Any questions please ask
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