Understanding Sounding, Ullage, And Frequency of Sounding
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3/13/2015 Understanding Sounding, Ullage, and Frequency of Sounding http://www.marineinsight.com/marine/understandingsoundingullageandfrequencyofsounding/ 1/14 Search Marine Insight Facebook 17 Twitter Google+ LinkedIn Pinterest You are here: Home / Marine World Understanding Sounding, Ullage, and Frequency of Sou NOVEMBER 7, 2010 BY KARANC If you have worked on ship, you must have come across the terms sounding and ullage, whic tend to confuse people. In this article, we will learn as to what the difference between soundin ullage is, and what is the importance of each one of them? Forums Photos Videos Premium eBooks Free eBooks HOME NEWS MARINE TECH NAVIGATION SAFETY CAREER LIFE AT SEA NAVAL ARCH PIRACY REPORTS A world of fabulous fares Up to 30% off to over 140 cities Book Now with our 5 Day Global Sale
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Understanding Sounding, Ullage, And Frequency of Sounding
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3/13/2015 Understanding Sounding, Ullage, and Frequency of Sounding
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Understanding Sounding, Ullage, and Frequency of Sounding
NOVEMBER 7, 2010 BY KARANC
If you have worked on ship, you must have come across the terms sounding and ullage, which oftentend to confuse people. In this article, we will learn as to what the difference between sounding andullage is, and what is the importance of each one of them?
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Both Sounding and ullage can be easily understood with the help of following diagrams:
Sounding is the measured height of the fluid from the surface of the fluid to the bottom of the tank.Ullage is the void space in the tank measured from the top of the tank to the upper surface of the fluid.Ullage is measured when the content of a tank is highly viscous and if the tank is filled to the maximum.
Sounding pipe is constructed in the tank. These pipes protrude slightly above from the top of the tank sothat sounding can be taken safely and easily without opening any manhole door. They even haveprotecting caps at the top which can be opened at the time of sounding.The sounding pipe is open from the bottom which allows the liquid filling up the pipe and facilitating it tohave the same level as of the tank.
After measuring sounding or ullage, it is compared in the sounding book to know the volumetric quantityof the tank. Thus, sounding of the pipe becomes sounding of the tank.
To avoid pressurizing of tanks, which can give a wrong reading in the sounding pipe and to avoiddistortion of bulkheads of tank, a vent pipe is provided which releases the air and vapors inside the tank.
3/13/2015 Understanding Sounding, Ullage, and Frequency of Sounding
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Frequency
Sounding frequency on a ship differs from company to company and according to the working policy andthe nature of operations going on board. A brief note as per the general procedure followed on ship isgiven below:
1) All Fuel oil tanks lube oil tanks and diesel oil tanks must be sounded twice a day, once in morning andonce in evening, and recorded in the event of leak or any other emergency related to oil content oftanks.
2) All waste water tanks including bilge and sludge tank must be sounded twice a day.
3) Ballast water tank and fresh water tanks should be sounded once a day.
4) As bunkering operation is one of the most critical operations, the frequency of operation drasticallyincreases at the initial and final stages of the operation (every 15 minutes) to check the inflow of oil incorrect tank at initial stage and to avoid overflow of oil during final stage of operation.
5) When waste water of ship is internally transferred, discharged overboard through 15 ppm equipmentor given to the shore facility, sounding is to be taken twice or thrice every hour.
6) When ballasting or deballasting of the tank is going on, hourly sounding is to be taken or as decidedby the chief officer.
7) Fresh water tank sounding to be taken daily. Feed water tanks in the engine room are to be soundedat every watch to keep a track of leakages.
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COMMENTS
Cameron saysMarch 11, 2015 at 6:44 am
Good Afternoon,
How does deballasting using pumps differ from stripping? Is there different pumps used forstripping or are they the same pumps used in the deballasting procedure. Can you isolate thestripping processes to one tank at a time or do you have to strip all tanks collectively.
Many Thanks,
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