1. Priority actions to engine room flooding casualties? (Not so sure what exactly the question wanted me to answer) I have answered the general flooding procedures, but the examiner said not what he wanted, and he reminded me there could be grounding to cause oil spills.

2. How to make sure the CO2 bottles are not accidentally released during CO2 room inspection?
Actually the question is asking the procedure of CO2 room inspection, when I mentioned ensure CO2 not to accidentally released, then examiner asked me how. I answered check the pin of the release handle, check the bottles body no be freezing, but he said that we’re not what he wanted…

Thank you ..

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1. Priority actions to engine room flooding casualties?

> i don’t really understand your question, In case of flooding priority is to save life, ship and the environment. If it was me as chief, i will raise general alarm, get the technical control team to bring the flood control equipment, check the location of the leak, control the inflow of water with the flood control equipment.

>> In the mean time, the bridge will prepare the ship tanks to pump the water to, first the bilge tanks will be filled, then the ballast tanks can be used considering the stability situation. In worst case the master can decide to pump the water overboard by opening the bile to ballast cross over.

>> This will be communicated to the nearest coast, port state, Office, Flag etc. If you are pumping the water using the ballast pump to overboard yes there can be oil pollution but to save the life and ship we have to sacrifice incase of no other possibilities.

2. How to make sure the CO2 bottles are not accidentally released during CO2 room inspection?

1. I will follow the ship’s SMS safety check list in doing so

2. The main master valve will be closed, locked out and tagged out – this prevents accidental release of CO2, Incase of blow through of the piping, then the releasing wire is disconnected, Individual cylinder release knob is locked with a pin. This pin is part of the releasing wire, to put back the release wire, the pin needs to come out which ensure the  cylinder doesn’t go locked when the system is returned back to service.

Let me know your thoughts

  • Ram Govindasamy

    >> It all depends on the level of contamination of oil. First –> Oil in observation tank ( in the hotwell) will be triggered and the condensate return will divert to bilge to save oil reaching the hot well.
    But let us consider your examiner question, contamination has already occurred.

    first step –> Identify & rectify the source of oil leak.
    Second step, considering light to moderate contamination –> Add coagulant chemical to the boiler water, wait for 24 hours, do scum blow down ( drain to go to bilge tank NOT overboard). Similarly the observation tank skimming of the hot well should be done to remove oil from hotwell.
    >> Increase Phosphate level, alkalinity control treatment, do regular blow down.

    In case of heavy contamination –> The boiler needs to be taken out of service to clean the tubes, drum, hot well, piping etc.
    This can be done by 2 methods
    1. Chemical treatment –> Very easy, no need to open the boiler
    2. Manual treatment –> Open & clean every part of the boiler internal, not very easy, not as effective as chemical treatment.

    >> Once on a similar situation, we had a treatment unit supplied by our chemical supplier which was used to circulate oil removing chemical. This is done as follows;

    1. Boiler shut down, completely drained to bilge tank.
    2. Treatment unit discharge is connected to bottom most flange of the boiler and the return is connected to the vent line of the steam drum.
    3. Fresh water is filled in to the treatment unit, circulating pump started, kept water filling in until the water started to flow through the return, now water filling stopped.
    4. The level in the treatment unit stayed constant, this shows the water is circulating without any leak or loss.
    5. The return water is passed through a ‘felt filter’ where the oil and other dirt are collected in the filter.
    6. Slowly the water temperature was increased using the heater in the tank to 85 Deg celcius.
    7. Similar procedure is continued for some time until the return water shows no sign of oil or contamination.
    8. Now the complete water is drained to bilge tank.
    9. Now follow step 1-4 and refill the system with fresh water.
    10. Now the oil removal chemical is added to the water.
    11. Slowly the oil started collecting on the felt filter –> Keep changing the filter material as it gets dirty.
    12. This process is continued for 6 hours.
    13. Now the water is drained

    14. Again follow step 1-4 fill up water
    15. Add detergent chemical supplied with the kit, wash through the boiler internals to rinse.
    16. Now the boiler can be returned back to service.

    —SIMAILAR treatment is done to clean the feed water system also—-

  • cheungcheonglung

    It is so comprehensive and useful, thank you!

    Just want to know more about first step Identify & rectify the source of oil leak.
    Is that same as I mentioned to do the hydro test to all heating coil and tubes after we stop the the boiler. Or there is another method to determine the leakage point? I just wonder the hydro test to all tubes and coils is not practical to real cases, because some of the coils can not easily reach such as the fuel oil tanks’ heating oil.

    Thanks so much

  • Ram Govindasamy

    >> If you consider a large ship especially a cruise ship identifying the source of contamination is really challenging, but there is a easy way to “NARROW DOWN” the circuit which is leaking and then find the particular item in that circuit.
    >> Usually the dirty condensate from all oil heaters (FO, LO, purifier, Tank, cargo heaters) are connected using separate lines. When the hotwell shows sign of oil, shut down all steam users of the dirty system and open them one by one, and wait while observing the return for any trace of oil…..You will be able to find the circuit which is causing the contamination.
    Once the contaminating circuit is found then go to individual steam user in that circuit and check for contamination using below 2 simple methods.

    There are many simple way to check the leaks, One very simple thing to check is to open the drain line on the return line and see if there is any trace of oil.
    Second simple thing is to check the steam trap, just dismantle the steam trap and look for sign of oil.
    Once the above method reveal any trace of oil then you do a pressure test to confirm it.

    I would say, There is no one fixed method for such things, its your common sense and quick action. If you confidently speak to examiners about how you would handle the situation with different methods he will definitely accept you answer.

    Many times its the confidence and the common engineering sense is what the examiners look at.

    All the best

  • Ram Govindasamy

    By the way, hydro testing is very easy, you don’t have to go inside the tank, just disconnect the steam inlet & out let connections, blind the outlet and connect the inlet with a air hose with a pressure gauge and apply pressure to see if the coil is holding the pressure.

  • cheungcheonglung

    Thank you. Have never done it before, your answer is really helpful!!

    Thanks so so so much!

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