PRINCIPLES AND PRACTICE OF FLOW METER ENGINEERING L K SPINK.15

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For most engineering design purposes, the manufacturer of an orifice flow meter has only a few inches to 1 inch of room to be useful. This means the flow coefficient K is small for most purposes. However, K dependencies due to height of discharge opening, pressure tap location, materials, etc. could be significant.

The K factor is proportional to the relative pressure drop of the orifice Δ as well as proportional to the leakage that it collects and at the same time acts as a correction factor for a variety of sources of error.

The ASME boiler-boiler section 33.4 covers orifice meters as a main flow indicator. It states: “the most effective prrrortion of a clean, uniform flow of water through the orifice at the inlet end of a pipe is 0.6 ” Three fluid flow foc,pty texts discuss the use of a single flow coefficient K.

An example of the relationship between flow coefficient and leakage factors is provided to aid in interpreting the far more complex data resulting from a duct pressure measurement diagram. Pressure/flow chart analysis will show leakage more readily as the flow coefficient K changes with duct pressure and leakage variation. d2c66b5586