Tank Calibration Service

Tank Calibration Service

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Tank calibration of a vessel is done using precise measurements and calculations to determine if shifting, expansion, contraction, or settling has occurred inside and outside of a tank. These changes may affect the volume of the vessel. A tank calibration service can save money because a tank that has settled or changed shape will affect inventory control. This service is usually required for a steel tank that has been repaired by welding new plates internally or when a new lining has been applied to the tank.

The most common method used for the physical calibration of vertical tank shells is “tank strapping”. When we conduct a tank strapping service, we survey the tank by physically measuring the tank strakes with a calibrated steel tape at several levels on each course of plating. A physical survey is faster, cleaner and does not require the availability of large quantities of water and removal following calibration. To measure underground cylindrical tanks internally a laser level and distance instruments are used. A volumetric method may be selected instead because of access restrictions (manway size and layout of the piping).

The calibration company that performs the tank strapping should have a thorough knowledge of the standards, the measurement procedures and the calculations involved to ensure that the correct measurements are taken. CommTank calibrates tanks for oil, gas, and other petroleum products to the following API and ISO Standards:

  • API 2550 Upright Cylindrical Tanks Measurement Method
  • API 2551 Horizontal Tanks Measurement Method
  • ISO 7507-1 Vertical Tanks Strapping method

We always use safe practices. Our crews are trained in confined space entry procedures and they have the necessary safety equipment to work in confined spaces and at heights.


Contact CommTank today for expert tank calibration service in Massachusetts and New Hampshire: 1-800-628-8260