Calibration

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Calibration     When To Calibrate a Vessel The National Institute of Standards and Technology states that test measure and prover calibration may be established at 1-year intervals and extended or reduced on historical evidence up to the limit determined by your regulatory agency, or ISO regulations  but should not exceed 3 years due to possible leaking valves or seals which are often difficult to observe under field conditions.  Vessels can only be tested if they are: Clean (no oil residues) Have no visible damage The drain valve (if applicable) is in good working order