It is essential to measure Corrosion Inhibitor, accurately and continually. With the correct system, pipeline life can be extended for many years.
Corrosion Inhibitor, sometime abbreviated to CI, is manufactured by various chemical companies to inhibit (to stop or slow) the rate of corrosion inside a pipeline as it carries a flowing product. In the normal Litre Meter context, a company that is heavily involved in Oil & Gas flow measurement, the flowing product is crude oil, straight out of the well.
Depending on the chemistry of the well, a specific inhibitor will be recommended or will be formulated to treat the oil in an optimum manner. As each well is different a large variety of solutions can now be chosen. For flow measurement, the two main variables are flow rate and viscosity. Usually the fluids are compatible with stainless steel but sometimes higher specification steels or more exotic materials like titanium are required.
If not enough CI is present in the oil then the pipe walls will be corroded and will eventually lose their integrity and then fail. If too much is injected then costs can quickly mount up. Not only is the raw inhibitor expensive but also the tanks will need replenishing more often. Worse still, the refineries will charge dollars per barrel to remove the excess before the crude oil can be processed.
Relying on pump speed, combined with calculation of volume per stroke, is insufficient for full flow assurance. The pump motor can be going but that’s no guarantee the fluid is flowing or that the amount is correct. Full flow measurement is necessary. Optimal meter selection, by experts, ensures good measurement over the full range of flows that the process can experience. It’s not unusual for the flow rate to vary by a factor of a 100 during the life of a well so a wide ranging flowmeter system is a good choice.
The VFF positive displacement flowmeter has been developed over the years to meet all the requirements of chemical injection and more. They all offer:
- Excellent materials, for long life, compact and lowest weight.
- Repeatability – what happens now is the same as a year ahead
- State of the Art instrumentation – mostly in SS with 4-20 and HART and linearisation.
- Flexibility, changeable internals for gross range changes, high pressure ratings as standard, etc
Corrosion Inhibitor measurement = VFF