Flow Meters

The most difficult part of a field test is the flow meter, if it wasn't planned in the construction phase. There is no way to simulate a meter run if you don't have the proper pipe length. Figure 10-8 is an example of the requirements. An ASME long radius flow nozzle is preferred by the author, though a short throat venturi will do. The probability is that an orifice is all that will be available. It should be examined before and after the test to verify not only the bore diameter, but the finish. The bore should

Pressure Tap

Temperature Tap

Orifice

Pressure Tap

Temperature Tap

Orifice

Figure 10-8. Requirements of a meter run.

still be smooth, free of fouling material, and the edges sharp and square. It will be difficult to achieve, but remember the better the instrumentation performs, the less the data scatter that will require rationalization later.

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