December 2000

Instrumentation/Control

Consider slotted orifice flowmeters

Accuracy can be an order of magnitude better with less permanent head loss

Hall, K. R., Texas A&M University

Reasearch shows performance of a standard b = 0.50 orifice flowmeter is not as good as the same flowmeter with a slotted orifice plate replacing the standard orifice plate. The slotted orifice plate has the same total open area as the standard plate and has radial slots arranged in three concentric rings. Experimental tests use a concentric pipe device and a swirl generator to produce a wide range of axial velocity profiles with and without swirl. Data indicate that the slotted orifice flowmeter only requires compact header configurations with very short upstream pipe lengths and maintains accuracy in the range of 0.25% with no flow conditioner. In addition, permanent head lo

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