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How will you ensure that a representative sample is drawn during bunkering

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  • How will you ensure that a representative sample is drawn during bunkering

    How will you ensure that a representative sample is drawn during bunkering


  • #2
    • The most common and most economic means of obtaining a representative sample is by using a drip type sampler.
    • After the checks of documents and bunker quantity on a barge, chief engineer should ensure that sampling points are fixed.
    • Sampling should be taken at one point only. All sampling should be carried out either at barge manifold or ship’s manifold. This must be agreed between the
    • supplier and the vessel (i.e. place of sampling)
    • The sample must be representative of the total delivery and ideally taken by ‘drip feed’ at the discharge side of the manifold, during pumping.
    • Sampling equipment should be used by the manufacturer’s instructions, or guidelines, as appropriate. A means should be provided to seal the sampling
    • equipment throughout supply.
    • The primary sample receiving container should be attached to the sampling equipment and sealed to prevent tampering or contamination of the sample
    • throughout the bunker delivery period.
    • The tube within the sampler and sample valve should always be cleaned before use.
    • When bunkering starts, place a container under the sampler, open the sampler valve fully and flush the sampler with fuel. After flushing, the sampler, close
    • the valve and attach a suitable clean container to the valve. Adjust the needle valve to give a slow and steady drip. Time the fill rate so that it will provide for
    • sufficient estimated sample over the expected delivery period.
    • On completion of bunkering, mix the samples from both containers to ensure you have a good, representative sample from the bunkering operation.
    • After bunkering sample bottles to be sealed, dated and signed by both parties, four samples to be taken – one each for the ship, barge, lab analysis and
    • MARPOL sample.

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