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Thread: Legal Metrology : Vertical Storage Tank calibration

  1. #1
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    Default Legal Metrology : Vertical Storage Tank calibration

    Vertical Oil Storage Tank (VST) is a capacity measure described in the Legal Metrology (General) Rules, 2011's ninth schedule, Part II & III. This Schedule is applicable only to tanks meant for bulk storage of petroleum or liquid petroleum products.

    Calibration is a method of finding the volume of a tank. The tank is inspected 'in situ' and is calibrated using standard engineering techniques. It also gives the volume of a tank depending on the height of fluid in the tank - Using a calibrated dip rod and a dip chart, one can directly find the volume of fluid in a tank.

    Storage tanks are used to store fluids (liquids/gases), which are cold or hot. A storage tank can have flat bottom, fixed or floating roof. A storage tank can be above ground or under ground, cylindrical in shape, made of steel with elliptical/conical heads. Large storage tanks are commonly used to store Petroleum products.

    (Legal Metrology (General) Rules, 2011's ninth schedule, Part I deals with the Calibration of Vehicle Tanks for Petroleum Products and other liquids.)


  2. #2
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    Default Calibration of Vertical oil storage tank

    Calibration of Vertical oil storage tank

    The tank is filled at its present location with the product to be stored to its working capacity or with water to its equivalent height, and such product or water has been held in the tank for atleast 24 hours to allow for settling.

    Tank calibration is mainly done by strapping and internal measurements. When the tank drawing and measurements is available from the manufacturer, it is checked for correctness. Then calibration tables are prepared and the capacity is found.



    The complete calibration data is entered on the Tank Measurements Record Form. It contains -

    Tank No, Owner's Name, Plant or property name, Location, Manufacturer, Erected by, Description, tank contents, average temperature, Hydrometer reading, type of roof, weight of floating roof, type of bottom, No of joints, elevation, Deadwood details, Height, shell Circumferences, height or depth of crown etc.

    The overall height shall be measured, using dip tape and dip weight, from the dipping datum point to the reference point on the dip hatch. This overall height shall be recorded and marked on the tank at the dip hatch.

    Equipments required : Steel rule, Spirit level, Awl and scriber, marking crayon, record paper, plumb line, positive displacement bulk meter, Rope, hooks, safety belts, ladders etc.

  3. #3
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    Default Transaction & Protection

    Legal Metrology (General) Rules, 2011 do not set any metrological requirement for vertical storage tanks. No MPE (Maximum Permissible Error) is also prescribed.

    Rule 13(2) : Every measuring instrument used or intended to be used -

    (1) in any transaction, or
    (2) for protection,

    shall conform, as regards physical characteristics, configuration, constructional details, materials, performances, tolerances and such other details, to the corresponding specifications laid down for such measuring instrument in Eight Schedule.

    Protection is defined in Sec 2(k) of the Legal Metrology Act, 2009 as

    (k)"protection" means the utilisation of reading obtained from any weight or measure, for the purpose of determining any step which is required to be taken to safeguard the well-being of any human being or animal or to protect any commodity, vegetation or thin, whether individually or collectively;

    Transaction is defined in Sec 2(u) of the Legal Metrology Act, 2009 as

    (u) transaction, means -

    (i) any contract, whether for sale, purchase, exchange or any other purpose, or

    (ii) any assessment of royalty, toll, duty or other dues, or

    (iii) the assessment of any work done, wages due or services rendered;

  4. #4
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    Default Calibration & Stamping of VST

    Vertical Storage Tank has to be verified and stamped once in 5 years as per rule 27 of the Legal Metrology (General) Rules, 2011.

    After tank calibration, datum are recorded and capacity is found (in kl). Tank is stamped by the Legal Metrology Officer and Certificate is issued.

    The Stamping fee for tank calibration from Schedule X of the Kerala Legal Metrology (Enforcement) rules, 2012 is

    (2) Capacity Measures :

    Rs 50 for the first 100 l (litre) plus Rs 7 for every additional 100 l or part thereof, subject to maximum of Rs 5000.

    Penalty

    When a Vertical Storage Tank is used for 'transaction' or 'protection', it has to be get calibrated and stamped by Legal Metrology under Sec 24 of the Legal Metrology Act, 2009. The violation of Sec 24 is punishable under Sec 33 of the above Act with fine up to Rs 10 000.

  5. #5
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    Default

    Quote Originally Posted by Perfection View Post
    Legal Metrology (General) Rules, 2011 do not set any metrological requirement for vertical storage tanks. No MPE (Maximum Permissible Error) is also prescribed.
    The MPE for the Vertical Storage Tanks and the Horizontal Storage Tanks have been discussed in detail vide IS: 2008 – 1961 for Vertical Storage Tanks and in IS:2166-1963 for Horizonal Tanks and we have separate IS for computation Calibration Charts also. Pl also note that "The Legal Metrology (General) Rules, 2011 does not contain any information regarding the calibration of "Prover Measures".

    A.V.V.RAJAGOPAL-COIMBATORE-TAMILNADU
    Formerly Deputy Controller of Legal Metrology (Storage Tanks)

  6. #6
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    Default

    Storage tanks are used to store fluids (liquids/gases), which are cold or hot. A storage tank can have flat bottom, fixed or floating roof. A storage tank can be above ground or under ground, cylindrical in shape, made of steel with elliptical/conical heads. Large storage tanks are commonly used to store Petroleum products.


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    Last edited by Brodon; 11-10-2014 at 06:28 AM.

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