2 edition of effects of flow straighteners on orifice plates in good flow conditions. found in the catalog.
effects of flow straighteners on orifice plates in good flow conditions.
D. J. M. Smith
Vortex flow meters like a fully developed flow profile and typically require long straight upstream piping runs. Elbows, reducers, etc upstream of the sensor will distort the flow profile and so adequate straight runs need to be accounted for. Typical recommendations suggest 35 straight pipe diameters upstream and 5 straight pipe diameters. Investigation of laminar and turbulent flow through an orifice plate inserted in a pipe Article in Transactions- Canadian Society for Mechanical Engineering 28(2) June with 1, Reads.
orifice flow coefficient, K, is constant. However, it is known that under some conditions, a change in the orifice coefficient is possible. Figure 5 shows the results of a coefficient shift. FIGURE 5. Effect of a Shift in Orifice CoefficientFile Size: KB. Mach No is a measure of compressibility effects, for example a gas flow with V = 98 ft/s and c = ft/s has M = 98/ = 7/ Although the gas is compressible, it will have a negligible effect on the velocity profile (*M2 = % change in density) In most practical cases of gas flow Re is high and the flow is Size: KB.
produced a smaller effect on flow measurement than testing with a high beta orifice plate and lower injection rates. The authors suggest that there were many potential mechanisms which could affect flow measurement. Some of the mechanisms produce under-measurement of flow and some of the effects produce over-measurement of Size: 80KB. During the flow conditioner tests in good flow conditions, a set of data was also taken with each flow conditioner pulled back a distance C = 50D upstream of the orifice plate. These results can be used to check the baseline [d] values for each value of beta ratio.
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There are huge amounts of data on installation effects on orifice plates, but very limited data on installation effects on Venturi tubes. The effect of upstream fittings and pipework is considered in terms of peakiness of profile, asymmetry and swirl. - The effect of the location of an in-line tube bundle on orifice flowmeter performance Colorado, was used to test a mm (4 inch) stainless steel orifice meter.
The orifice meter had flange taps, and the differential pressure was measured with trans- by: 1. An explanation of the effect of the straightener itself on the orifice coefficient is presented in terms of the kinetic energy coefficient of the flow, and the effect of the swirl with no straightener in the line on the orifice plates was also by: 8.
The Effect of Disturbed Flow Conditions on the Discharge Coefficient of Orifice Plates S. SUMMARY The accurate measurement of flow rate using orifice plates depends upon many factors. One such factor is the condition of the flow in the pipe just upstream of the metering station.
minimum of 70D upstream of the orifice plate, with less than 2 degrees of swirl upstream of the 70D tube. This test should be performed with the same orifice plates and ratios that will be used for tests 2 to 5.
Good Flow Conditions with the flow conditioner downstream of the meter tube used in. flow into the pump to minimize wear and maximize service life. General flow straighteners / conditioners reduce straight-run requirements to just a few diameters. General flow straighteners / conditioners eliminate the flow distortion effects of elbows, pipe expansion or reductions, valves, dampeners and other disrupters toFile Size: KB.
C Compact Conditioning Orifice Plate, are differential pressure producers used to measure rate of fluid flow in a pipe. Conditioning Orifice Plate Technology is based on the same Bernoulli streamline energy equation and as a result follows the same Discharge Coefficient versus Reynolds Number relationship as standard orifice Size: KB.
orifice plates are relatively simple to produce and have well-known characteristics over a wide range of flow conditions.
The pressure drop across an orifice plate is typically measured using a differential pressure transducer. Within the transducer, pressure from either side of the orifice plate is applied across a Size: 1MB. a minimum of 70D upstream of the orifice plate, with less than 2 degrees of swirl upstream of the 70D tube.
This test should be performed with the same orifice plates and b ratios that will be used for tests 2 to 5. Good Flow Conditions with the flow conditioner downstream of the File Size: KB. with Vortab flow conditioner 6 x Pipe ID 1 x Pipe ID Recommendations shown are for general reference only as actual application conditions can vary and multiple effects are possible.
FCI flow meter performance guarantees are only available following completed. Flow Straighteners DESCRIPTION Cox Flow Straighteners offer a simple method of reducing or eliminating flow swirl, as a result of pipe bends and the location of valves, thermowells or pressure taps naturally found in piping systems.
The six vane straightening element, within the upstream straightener (sizes 1/2" and up), produces less pressure File Size: KB. The use of sharp-edged orifice plates to measure the mass dryness fraction in two-phase flow in pipes is discussed. In particular the influence of the following aspects are examined: a conditions near Cited by: 1.
Flowell Straightening Vanes are designed to be installed in piping upstream of an orifice plate. When used with recommended minimum pipe lengths, they reduce flow disturbances caused by upstream piping configurations or valves.
Flowell manufactures both line mounted and flanged models in carbon steel and and stainless steel. Either using a long straight pipe, or a flow conditioner upstream of an orifice plate, usually achieves this effect of a fractal flow conditioner for both standard and non-standard flow.
Keywords: orifice plates, installation effects, EEC programme Introduction It is well known that the performance of an orifice plate flowmeter is influenced by the velocity profile in the fluid flow.
A fully developed turbulent velocity profile which may be obtained downstream of a long stra [ght length of pipe is Cited by: 5.
Flow Meas. Instrum. Vol 3 No 4 Effect of plate depth on the performance of a Zanker flow straightener E. LAWS* and A. OUAZZANE* The Zanker flow straightener is one of the flow conditioning devices included in ISO It consists of a graded perforated plate followed by a section of rectangular honeycomb one pipe diameter in by: 5.
A: The orifice coefficient research is done with long, straight, run of pipe because this is the only arrangement that can be duplicated. Anything less than that is likely to have a nonstandard flow pattern, and it will affect that coefficient.
See the standards or a good flow handbook to see what is required for good accuracy. Vortab flow conditioners reduce straight-run requirements to just a few diameters.
Vortab flow conditioners eliminate the flow distortion effects of elbows, pipe expansion or reductions, valves, dampeners and other disrupters to produce a swirl-free, symmetrical and repeatable flow profile to the flow meter, pump, or other critical components.
Test 2 - Good Flow Conditions Morrow () reports performance within specification at flow conditioner - orifice plate intervals of 5D and greater under good flow conditions using natural gas (p. 7, p. 16 fig. 2c) (see below).
β-ratio in this test was NOVAE FLOW TEST DATA The information contained in this document. Although it is a simple device, the orifice plate flow meter is, in principle, a precision instrument.
Under ideal conditions, the inaccuracy of an orifice plate can be in the range of % AR. Orifice plates are, however, quite sensitive to a variety of error-inducing conditions.
• All volumetric flow meters can be flow conditioned: Orifice, Ultrasonic, Venturi, Coriolis Vortex, Turbine, Cone, Mag, etc. • Every meter type responds differently to the effects of swirl and flow profile distortion.
• Volumetric flow meters are looking for ‘good flow’.flow distortions. In this paper, the effects of various entrance flow velocity profiles, generated by a ball valve on the accuracy of an orifice meter are investigated. The performance of the flowmeter is also assessed when coupled with a vaned-plate flow conditioner and an NEL-plate flow conditioner.
2 Experimental Air flow rig.In the two cases where straighteners take up the same volume and surface area as the flow passage, the numerical simulations of flow in the water cannon are studied at 1 m3/h design flow : Youngjin Seo.