Impact of the gas mass flow rate on orifice measurements accuracy (original) (raw)
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Experimental research of single-hole and multi-hole orifice gas flow meters
Flow Measurement and Instrumentation, 2019
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Wet Gas Measurement with Slotted Orifice Meter--Effect of Geometry of Slots and Pressure
Chemical Product and Process Modeling, 2011
Wet gas metering by differential pressure flow meters is gaining prominence in the oil and gas industry, owing to their simple construction. Slotted orifice, a modified version of the standard orifice meter has been found promising by many researchers. This novel flow meter is shown to be insensitive to the upstream flow profile with lower head loss and faster pressure recovery compared to the standard orifice. In the present work, the effect of geometry of slots and pressure on the performance of the slotted orifice has been studied by CFD modeling of the wet gas flow. The performance of slotted orifice with rectangular perforations (1.5 ≤ l/w ≤ 3.0) and circular perforations has been compared with that of the standard orifice having same β-ratio of 0.40. Simulation results reveal that the shape of perforation of the slotted orifice has no effect on the differential pressure. However, the pressure recovery with the rectangular slots is found to increase with increasing aspect ratio...
Performance of an Orifice Meter Handling Two-Phase (Gas-Liquid) Flow.(Dept. M)
MEJ. Mansoura Engineering Journal, 2020
and mining transportation processes to measure the two-phase flow rates. Most of engineering systems have flow rate metering instruments, which mainly are affected by the properties of the two phases and the void fraction values. So, better understandings of the two-phase flow through systems are required to enhance the flow rate measurement accuracy and performance. In the present study, the orifice meter was selected due to its wide use in most engineering applications. The orifice meter is simple in design and construction, and is a limited maintenance metering device. Monni et al. [1] investigated experimentally the annular two-phase flow through a venturi flow meter in a vertical upward pipe (80 mm inner diameter). The experiments were performed at air void fraction values up to 0.97 to simulate nuclear accident cases. The value of the two-phase pressure drop between the venturi flow meter inlet section and throat section, and between inlet section and outlet section were dependent on the two-phase flow parameters (phase velocities, void fraction and dryness fraction). Also, new correlations were proposed to relate the flow rate as a function of the twophase pressure drop.
The Chemical Engineering Journal and the Biochemical Engineering Journal, 1995
A series of experiments was carried out to investigate the effect of liquid accumulation upstream of an orifice meter in a horizontal pipeline. The orifice meter was used to measure gas flow which contains small amounts of liquid. The experiments have verified that significant amounts of liquid will accumulate at low gas flow rates. The accumulated level is independent of the gas mass to total mass flow fraction within the investigated range from 0.91 to 0.95. The accumulated liquid will affect the form of the vena contracta. This will result in the observation of a lower differential pressure drop across the orifice for a given flow rate, and errors in the determination of gas mass flow will be introduced. An iterative method to quantify the effect of the accumulated liquid upstream of the orifice is suggested.
Response of a slotted orifice flow meter to an air/water mixture
Flow Measurement and Instrumentation, 2001
Flow measurements using differential pressure meters are common in industrial applications. In such cases, the flow of gas is often accompanied by conditions that can lead to liquid condensation. As a consequence, flow measurements basically involve gas-liquid mixture metering. For this reason, errors occur in the metering equipment resulting from the variations in the characteristics of the continuous phase that is present in the flow. In addition, the existence of a dispersed phase leads to the development of flow disturbance and pressure pulsations. Therefore, new methods and tools are being sought to enable the measurements of gas-liquid mixture flows that will offer a suitable accuracy of measurement in the instances of flow interference in the form of a liquid phase. This paper reports the results of a study into the application of orifice plate meters for gas-liquid mixture flow metering. The analysis of the influence of the geometry of an orifice meter on the measurement of a two-phase mixture flow was carried out for this purpose. Experimental tests were carried out by application of a standard orifice and three slotted orifice meters with various designs. The experiments included the measurements of air flow containing small amounts of dispersed water in the form of droplets. The analysis also involved the level of differential pressure that is obtained as a result of applying orifice meters, and the level of the permanent pressure loss caused by the installation of an orifice plate. The results of the research were compared with the results obtained for the standard orifice.
The impact of the orifice plate deformation on the differential pressure value
The European Physical Journal Conferences
This work aims to determine the impact of orifice plate deformation on the differential pressure at the high-pressure natural gas pipelines. The article focuses on the differences of the pressure values, velocity values and flow directions between deformed and undeformed orifice plate. The article contains deformation analysis of the orifice plate and CFD simulations of flowing natural gas through the orifice plates. CFD simulations contain basic models of the turbulence for both types of orifice plate. Whole research is based on the elimination of the negative influence of the deformation on the precise flow measuring of natural gas at the high-pressure pipelines.