A refinery needed flow data on a live process line. Cutting into it meant a hot-work permit, a gas test, a fire watch, a shutdown, and a new flanged joint on a service where every joint is a future leak. The measurement was worth having; the intrusion was not worth the risk or the paperwork.
Clamp-on ultrasonic measurement on the outside of the live line. No hot work, no permit, no shutdown, no new leak path. For a clean hydrocarbon in a full pipe, transit-time was the right technology, and the survey was completed on a live unit without the process ever knowing the instrument was there.
Hazardous-area classification was the first question, not the last. On a classified unit, the transducers, cabling, and transmitter all have to match the area rating — and that is a decision made before anything is specified, not discovered afterward. It was confirmed up front.
In refining, the real comparison is rarely clamp-on versus another meter — it is clamp-on versus not measuring at all, because the intrusion is what you are trying to avoid. Settle the area classification first; it governs everything else.
Send us the pipe and the fluid and we will tell you what will actually work.
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