The actual pressure in the system varies through the day and unless this is allowed for, by the end of the day, very significant errors can arise. This is typical of many steam systems. 78 10 8 6 4 2 0 2 500 2 000 1 500 1 000 500 0 Orifice plates are still the most widely used type of flowmeter in the world today. Feb 12, 2018 - An orifice plate is a very powerfull and cheap flow measurement device. Hole needed to perform the measurement of a given mass flow rate based. The necessary diameter to perform this type of measurements based on.

Description Orifice plate is very practical and relatively low-cost measuring device for flow rate measurement with good accuracy. By placing orifice plate in the pipe, sudden pressure drop is created. Degree of created pressure drop is directly proportional to the stream velocity and consequently, to the flow rate. That behavior and strong interaction between stream velocity and pressure drop due to local restrictions is used for flow rate measurement by orifice plate. This calculator can be used for calculating of actual flow rate through orifice plate flow meter, for measured pressure drop and can also be used for orifice plate sizing.

Available calculations • Flow rate for known orifice size and pressure difference • Flow velocity in the inlet pipe • Discharge coefficient calculation • Gas expansion coefficient for compressible flow In Selection section you can select values to input. Not selected values will be calculated. You select between: • flowing fluid - gas or liquid • pressure after the orifice or pressure difference in front and after the orifice • kinematic or dynamic viscosity • density or temperature for gases • orifice tap position type • calculation within or out of ISO5167 constraints In Report section you have instant calculation report for input values.

From there you can copy/paste report to your text editor.

When is this calculator relevant? The calculator is suitable for liquids and perfect gases, a subsonic flow of single phase fluid. It is not applicable for pulsating flow.

The pipeline should be circular. The calculator is not applicable for rectangle pipes. When is this calculator not relevant? This calculator is not suitable for multiphase fluids, like a flow of liquids that contain solid particles or flow of liquids that contain undissolved gases. Also, it is not suitable for gases that are not ideal, i.e., gases that don't relate to the ideal gas law. Katekyo hitman 10 sub indo. What has to be understood to perform the calculation? To calculate flow rate, you have to enter the orifice plate throat diameter as well as pipe interior diameter, together with fluid properties - density and viscosity.

For a gas as flowing fluid, instead of the density, you can enter gas constant, pressure and temperature at actual conditions. Density is then calculated using a perfect gas state equation. You should enter density on real flow conditions - pressure and temperature.

How is the calculation performed? The calculator is doing calculation according to ISO 5167-2. You can expect to have correct and reliable results only if the orifice plate meets the conditions from the standard. What are the standard ISO 5137-2 conditions? For the flow of a perfect gas, the pressure loss created by the orifice must be higher than 0.75. Orifice meters which have corner pressure tappings or D and D/2 pressure tappings must meet following conditions: d > 12.5 mm 50 mm 5000 for 0.1 16000xβ 2 for β > 0.56 Orifice meters which have flange pressure tappings must meet following conditions: d > 12.5 mm 50 mm 5000 and ReD > 170xβ 2xD What happens if a calculation is not within these limits? If the orifice plate properties or flow conditions are not according to the ISO 5167-2 calculator displays the message.