Patent ID: 6423152
Filing Date: 2002-07-23
Classification: B08B,F28G

Abstract:
A method of treating internal surfaces of a closed fluid system by passing a plural phase fluid flow through the fluid system to remove a scale from the system or to apply a coating to the system, comprising the steps of:quantity-controlling the fluid flow of a liquid-gas mixture to achieve a liquid-gas volume ratio with the gas volume being a substantially higher volume than the liquid volume; supplying the fluid flow to a mixing head having an outlet connected to an inlet of the fluid system; having an outlet of the fluid system connected to an expansion separator; separating and separately extracting from the expansion separator the liquid and the gas; using a first pump to bring the gas from the expansion separator to the mixing head; filtering the liquid leaving the expansion separator to remove particles from the liquid; and recycling at least a part of the liquid at the mixing head.