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TANK CALIBRATION METHODOLOGY :
 

METHODOLOGY USED (International Standard : OIML approved)
(India is a member country of OIML)

ISO 7507-1:2003
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 1: Strapping method

ISO 7507- 2 : 2005
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 2: Optical-reference-line method

ISO 7507- 3 : 2006
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 3: Optical-triangulation method

ISO 7507- 4 : 2010
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 4: Internal electro-optical distance-ranging method

ISO 7507- 5 : 2000
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 5: External electro-optical distance-ranging method

ISO 7507- 3 : 2006
Petroleum and liquid petroleum products - Calibration of vertical cylindrical tanks - Part 6: Optical-triangulation method

 
 
 
 
Note : In India storage tank calibrated maintaining legal metrology act and rules only as it is prescribed. Other method beside it can be done outside India. All methods subject to approval of Legal Metrology Rule 2010.
 
PROCEDURE OF VERTICAL STORAGE TANK CALIBRATION
 

STEPS FOR CALIBRATION

  1. Strapping (Linear & Non Linear measurement)
    • Circumference measurement of each course at least 2 per course
    • Taking of course height and total tank height
    • Plate thickness detection
    • No. of joints and its step-over correction
    • Detection of DIP reference height
    • Safe height detection
  2. Bottom Calibration (in side tank work)
    • Fitting water flow meter with water connection and taking reading opening & closing for datum flush
    • Taking datum height
    • Water level at various places in side the tank as when required in calibration process
    • Deadwood correction factor (+ factor and – factor) taking into consideration
  3. For Floating Roof
    • Height of the deck
    • Weight of the roof
    • Density correction
    • Inaccurate zone detection
  4. Preparation of computerised calibration chart with CD and drawing with detail report as required
  5. Approval and certification from Govt. Statutory Body
 
SAVE OIL. BETTER & SMOOTH OPERATION, STOP WASTAGE & PILFERAGE BY ACCURACY IN STORAGE TANK CALIBRATION
 
Indian Standard Specification for Vertical Storage Tank based on Indian Standard on Petroleum Measurements.
2007-1974 : Method for Calibration of Vertical oil storage tanks
2008-1961: Method for computation of capacity tables of vertical oil storage tanks
Indian Standard Specification for Horizontal Storage Tank based on Indian Standard on Petroleum Measurements.
2009-1975 : Method for Calibration Horizontal and tilted oil storage tanks
2166-1963 : Method for computerisation of capacity tables for horizontal and tiled oil storage tank
Weights and Measure (Legal Metrology Department) Rules – Ninth A Schedule, Part No. II & III of the S.W.M. (General) Rules, 1987
 
PLEASE NOTE
Items required for Storage Tank Calibration work
 
  1. ARRANGEMENT
    Govt. Statutory Fees & Inspector's Conveyance
  2. FOR STRAPPING
    Scraffolding:- For Linear/Non Linear Measurement & Ultrasonic Thickness Test Clean surroundings at tank site etc.
  3. FOR PHYSICAL BOTTOM CALIBRATION
    • Water/Product connection with hose
    • Pipe/Flunge/Fittings/Reducer arrangement for Fitting and Fixation of water/flow meter
    • Manhole opening should be there
    • Clean and clear bottom
    • Lighting arrangement if required
    • Inlet & Outlet should be closed properly
  4. FLOATING ROOF TANK FOR ROOF FLOATATION
    • Water connection with hose
    • Position to fit water meter with connection fittings arrangement for it from your part
    • Tank should be Box up and Manhole fitted
    • Roof at working height (i.e. lower leg position
    • Staying facilities if required during the time of floatation work
 
 
 
DEADWOOD CALCULATION SHEET
 
Manhole 1
Range From                                To
Inner Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Manhole 2
Range From                                To
Inner Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Nozzle 1
Range From                                To
Inner Dia –
Outer Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Nozzle 2
Range From                                To
Inner Dia –
Outer Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Roof Support
Range From                                To
Inner Dia –
Depth –
Total Vol. –
Per cm. Vol. –
(Any type of pipe)
Range From                                To
Inner Dia –
Outer Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Coil
Range From                                To
Inner Dia –
Depth –
Total Vol. –
Per cm. Vol. –
Legs
Range From                                To
Total Vol. –
Per cm. Vol. –
(Any type of pipe)
Range From                                To
Inner Dia –
Outer Dia –
Depth –
Total Vol. –
Per cm. Vol. –
 
 
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