Determination of installation effects for a 100 mm orifice meter using a sliding vane technique

Morrow, Thomas B.; Park, J.T.; McKee, R.J.

doi:10.1016/0955-5986(91)90051-r

Cited by 14 publications

(8 citation statements)

References 2 publications

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“…Recently questions have arisen about the effect of upstream flow straightener placement upon the discharge coefficient of orifice flowmeters. Work at NIST Boulder (Brennan et al, 1991), NIST Gaithersburg (Mattingly and Yeh, 1991), Southwest Research Institute (Morrow et al, 1991), NOVA HUSKY Research Center (Karnik et al, 1991), and Pacific Gas and Electric Company (Stuart, 1991) have shown that as the flow conditioner is moved along the pipe, the coefficient of discharge begins low when the conditioner (usually a tube bundle) is near the orifice plate. It increases in value passing through the value established by standards and then becoming too large, finally decreases to the correct value as the distance between the tube bundle and the orifice plate becomes very large.…”

Section: Introductionmentioning

confidence: 99%

Mean velocity and turbulence fields inside a β=0.50 orifice flowmeter

et al. 1993

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Section: Introductionmentioning

confidence: 99%

Mean velocity and turbulence fields inside a β=0.50 orifice flowmeter

et al. 1993

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“…Yet even though the velocity profile is conditioned and improved at a specified distance downstream, immediately downstream of a flow conditioner, there is an increased level of local turbulence. Karnik, Jungowski, and Botros (1994), Lake and Reid (1992), Morrow, Park, and McKee (1991), and Park, Morrow, Yeh, and Mattingly (1992) explored the variations in orifice plate C d for different velocity and turbulent profiles. Their research indicated that turbulence and velocity profiles influence C d .…”

Section: Meter Sensitivity To Turbulencementioning

confidence: 99%

“…Karnik, Jungowski, and Botros (), Lake and Reid (), Morrow, Park, and McKee (), and Park, Morrow, Yeh, and Mattingly () explored the variations in orifice plate C d for different velocity and turbulent profiles. Their research indicated that turbulence and velocity profiles influence C d .…”

Section: Introductionmentioning

confidence: 99%

Assessing the effects of local turbulence and velocity profiles on electromagnetic flowmeter accuracy

Beck¹,

Barfuss

Johnson

2019

AWWA Water Science

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While various researchers have explored the effects of turbulence profile development on orifice plates, the literature is not clear on how magnetic flowmeters respond to increased levels of local turbulence. Accordingly, this study investigated the effects of local turbulence and velocity profiles on magnetic flowmeter accuracy. Using five magnetic flowmeters from five different manufacturers, laboratory tests were conducted with a flow conditioner located at different distances upstream of the meter. Numerical modeling using commercially available computational fluid dynamics (CFD) software showed local turbulence levels in the pipe to be four times greater at one diameter downstream of a flow conditioner than the local turbulence levels without a flow conditioner installed. Furthermore, the CFD showed that the deviations in flowmeter accuracy were not proportional to the levels of local turbulence.

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“…Recent investigations by Karnik et al (1991), Mattingly and Yeh (1991). Brennan et al (1991), Morrow et al (1991), Gajan et al (1991). and Morrison et al (1992) hot-film anemometry to measure the velocity profile just upstream of the orifice plate.…”

Section: Introductionmentioning

confidence: 98%

Slotted orifice flowmeter

et al. 1994

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A new type of obstruction flowmeter has been developed as a "drop-in" replacement for the standard plate in an orifice flowmeter. The replacement consists of radial arrays of slots arranged over the entire surface of the plate. Generalizing the definition of the beta ratio for any obstruction flowmeter as: "slotted orifice" plate which exhibits significantly better operating characteristics. It is less sensitive to upstream flow conditions and has less overall head loss. The ultimate goal is to develop a "drop-in" replacement for standard orifice plates which results in a significantly more accurate meter for minimal investment. P = totalcomparisons between various designs can be made. The value of P for the standard orifice flowmeter using this generalized definition is still the ratio of the orifice diameter to the pipe diameter. Performance for a slotted orifice to a standard orifice have been compared with the plates installed in the same orifice run where various inlet velocity profiles were introduced to simulate poor upstream flow conditioning. The slotted orifice has less overall headloss and less sensitivity to upstream flow conditioning than the standard orifice plate. This results in a flowmeter which is more accurate than the standard orifice flowmeter over a much broader range of operating parameters.A standard orifice plate is one of a variety of obstructiontype flowmeters that can be used to measure the flow rate of a fluid in a pipe. By measuring the pressure drop across such a device, the pressure and temperature upstream of the device, the mass flow rate of the fluid can be determined. In its simplest form, the orifice flowmeter consists of a thin plate, with a hole in the center, that is clamped between pipe flanges. Because geometry is simple, it is low in cost and easy to install or replace. This device is used extensively to measure flows in processing plants, pipelines, water distribution systems, and at well heads. The main disadvantage of the standard orifice plate is its sensitivity to upstream flow conditions. Currently, efforts are under way to better quantify upstream flow conditioning effects on standard orifice flowmeters with the goal of increasing the installed accuracy by an order of magnitude. This work has taken another approach to obtaining the increased accuracy: replacing the standard orifice plate with a

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Determination of installation effects for a 100 mm orifice meter using a sliding vane technique

Cited by 14 publications

References 2 publications

Mean velocity and turbulence fields inside a β=0.50 orifice flowmeter

Mean velocity and turbulence fields inside a β=0.50 orifice flowmeter

Assessing the effects of local turbulence and velocity profiles on electromagnetic flowmeter accuracy

Slotted orifice flowmeter

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