Energy & Utilities Instrument Calibration

Up to a point. Clamp-on ultrasonic references extend to substantial diameters and are usually the practical answer, provided there is a suitable straight run and a full pipe. Beyond a certain size no adequate reference exists and we will say so rather than produce a figure with no defensible uncertainty.

Because the duty calculation depends on the difference, not the absolute values. Two sensors each within tolerance but erring in opposite directions can produce a differential error several times larger than either. Calibrating them as a pair is the only way to see it.

Efficiency is computed from measured flows, temperatures and pressures, so every error in those propagates into the result. Verifying the instruments in a balance tells you whether an efficiency change is real or an artefact of instrumentation — which is worth establishing before capital is committed to a fix.

For measurement instrumentation, yes, with isolation and permits agreed beforehand. Temperature and pressure points on steam service are calibrated using methods appropriate to the energy involved, and the safe approach is agreed before any work starts.