- GAS FLOW THROUGH AN ORIFICE DRIVER
- GAS FLOW THROUGH AN ORIFICE CODE
- GAS FLOW THROUGH AN ORIFICE ISO
- GAS FLOW THROUGH AN ORIFICE PLUS
- GAS FLOW THROUGH AN ORIFICE SERIES
Similar control mechanisms are available to keep the discharge pressure constant, or to keep the suction pressure constant. Consequently, the compressor flow is kept constant. As a result, the power turbine will produce less power and cause the power turbine, together with the driven compressor, to decelerate. If the discharge pressure is reduced, or the suction pressure is increased due to process changes, the controller will reduce the fuel flow into the gas turbine.
![gas flow through an orifice gas flow through an orifice](https://myengineeringtools.com/Images/K_Orifice_Graph.png)
Both the power turbine speed and the power increase in that situation. Thus, the compressor flow is kept constant. As a result, the power turbine will produce more power and cause the power turbine, together with the driven compressor, to accelerate. If the discharge pressure increases due to process changes, the controller will increase the fuel flow into the gas turbine. A flow set point is selected by the operator. Reaction times are very fast, thus allowing a continuous load following using modern, Programmable Logic Control (PLC)-based controllers.Ī simple case is flow control: the flow into the machine is sensed by a flow metering element (such as a flow orifice, a Venturi nozzle, or an ultrasonic device). A typical configuration can operate down to 50% of its maximum continuous speed, and in many cases even lower. This is a very elegant way of controlling a system, because both the centrifugal compressor and the power turbine of a two-shaft gas turbine can operate over a wide range of speeds without any adverse effects.
GAS FLOW THROUGH AN ORIFICE DRIVER
The following is a description of a typical control scenario, in this particular case for compressors with a gas turbine driver that can operate at variable speeds.Ĭentrifugal compressors, when driven by two-shaft gas turbines, are usually adapted to varying process conditions by means of speed control. George Talabisco, in Compression Machinery for Oil and Gas, 2019 Process Control With Centrifugal Compressors Driven by Two-Shaft Gas Turbines Sizing Valve for Liquid Expansion (Hydraulic Expansion of Liquid Filled Systems/Equipment/Piping) Be sure to obtain the manufacturer's certified coefficient for the valve you select. **Some manufacturers’ National Board Certified Tests will have different values for some of their valves. Refer to a later section this text or to specific manufacturers.
GAS FLOW THROUGH AN ORIFICE SERIES
Where the pressure relief valve is used in series with a rupture disk, a combination capacity of 0.8 must be applied to the denominator of the referenced equations. 187C.Ġ.62 for rupture disks and non-reclosing spring loaded devices ASME, Par. K n NAPIER CORRECTION FACTOR FOR SET PRESSURES BETWEEN 15 PSIG AT 10% OVERPRESSUREĮquation K 0 = 01906 P − 1000 02292 P − 1061Ĭourtesy Teledyne-Farris Engineering Co., Cat. K b = vapor or gas flow correction factor for constant back pressures above critical pressure (see Figure 7-26). K p = liquid capacity correction factor for overpressures lower than 25% for non-code liquids equations only, (see Figure 7-22). Isentropic coefficient, n, may be used instead of k. If a value is not known the use of k = 1.001, C = 315 will result in a safe valve size. If this factor is not available, compressibility correction can be safely ignored by using a value of Z = 1.0.Ĭ = gas or vapor flow constant, see Figure 7-25. Z = compressibility factor corresponding to T and P.
GAS FLOW THROUGH AN ORIFICE PLUS
T = inlet temperature ☏ absolute = (☏ plus 460) Below 30 psig set pressure, delta P = P 1 + 3 – P 2. At 10% overpressure delta P equals 1.1 P 1 – P 2. ΔP = Set pressure + overpressure, psig – back pressure, psig. P = relieving pressure in lbs per square inch abs. A specific gravity at any lower temperature will obtain a safe valve size. G = specific gravity of gas (air = 1.0) or specific gravity of liquid (water = 1.0) at actual discharge temperature. V L = required liquid capacity, gal/min (gpm)
GAS FLOW THROUGH AN ORIFICE CODE
This is as defined in the ASME Code and ANSI/API Std 526. ):Ī = required orifice area in square inches. Contact the authors for permission if you wish to use this application in for-profit activities.Where (Courtesy of Teledyne Farris Engineering Co. This application is intended for non-commercial, non-profit use only.
![gas flow through an orifice gas flow through an orifice](http://www-mdp.eng.cam.ac.uk/web/library/enginfo/aerothermal_dvd_only/aero/fprops/cvanalysis/orifice.gif)
Neither Maplesoft nor the authors are responsible for any errors contained within and are not liable for any damages resulting from the use of this material. Maplesoft and Maple are trademarks of Waterloo Maple Inc. Legal Notice: © Maplesoft, a division of Waterloo Maple Inc. Pipes diameters between 50mm and 1000 mm, Orifice meters use the pressure loss across a constriction (that is, the orifice plate) in a pipe to determine the flowrate.
GAS FLOW THROUGH AN ORIFICE ISO
This application calculates the flowrate through a large-diameter orifice using the approach outlined in ISO 5167 2:2003 App Preview: Gas Orifice Flow Meter Calculator You can switch back to the summary page for this application by clicking here.