Just as in the calibration of pressure gauges, we sometimes have to re-calibrate and adjust the standard or base pressure gauges as needed, so does fluid flow provers. In other words, flow provers also need periodic calibration. The main reason for this can be the change in the volume of the prover due to possible deposits in its wall, while the wear of the correctometer and the life of its equipment will also be a good excuse for calibration. But the next time calibrating a prover varies depending on the type of technology used in it. Obviously, the figures given are not a fixed version for all types of devices, that is, depending on the type of fluid or periods of use of a prover, because the type and amount of depreciation of devices is different, its calibration periods will also vary.
Different methods of calibration of probes
1. Water- Draw Method:
- Volumetric Water- Draw Method
- Gravimetric Water- Draw Method
2. Master Meter / Proving Tank Method
3. Master Meter / Master Pipe Prover Method
Calibration of provers by hydration method
Calibration of a prover means determining the base volume of that device. Given that the determination of the MF and the accuracy of the operation of a flow measuring device depends on the accuracy and precision of the prover used, it is obvious that this stage of the test is very sensitive and important. This method is either performed by the manufacturer or during the operation and according to the requirements of the period calibration time or calibration operation conditions will be required. Calibration will be performed in conditions where the inner surfaces of the prover is completely clean and there are no traces of hydrocarbons. The irrigation method is more cost-effective in small-capacity provers than in larger ones.
Calibration of provers is done in two ways:
- Direct proving, which is performed directly (with direct devices) and with water
- Indirect proving, we use the interface tool here
Taken from the book Measuring Fluid Flow (Author: Mohammad Hassan Movahedi)