This particular pressure drop calculator deals with what happens with orifice plates. Low velocity will result in lower or no pressure drop. High flow velocities and or high fluid viscosities result in a larger pressure drop across a section of pipe or a valve or elbow. Pressure drop increases proportional to the frictional shearВ within the pipe.

Also, gas is considered as ideal.Units of measure are both in SI and English system.Orifice plate calculator can be used for calculation of:For calculation of those values, necessary values for input are:Either pressure on smaller diameter - p2, or pressure drop p1-p2Either kinematic viscosity - ni, or dynamic viscosity - miBeside four values (Q, G, V1, V2), which calculation is main purpose of calculator, values that are not defined by user are determined in process of calculation (for example: if pressure p1 and temperature T are specified for gas flow - value for rho is calculated together with four main values (Q, G, V1, V2)). Fluid is considered as incompressible, so density (rho) and temperature (T) are constant through tube. Equation for ideal gas:Can be used for calculation of temperature T:Where R is gas constant (R=287 J/kgK for air).Orifice plate calculator can be used for both liquids and gases. Flow rate can be expressed in metric or imperial units.Looking for flow meters in South-East-Asia visitCalculation of flow rate using orifice plate calculator is for incompressible flow, based on the Bernoulli principle:Assumption that pressure lost is negligible (pressure drop is obvious and included with coefficient of discharge which is introduced bellow):And if velocities substituted with flow rate:Pressure drop through the orifice because of velocity increase can be calculated as follows:Expressing flow rate from the previous equation leads to:Coefficient of discharge can be calculated using following equation (ISO):ReD - Reynolds number which can be calculated as follows:L1 and L2 are functions on tap type and it is:Expansion coefficient e can be calculated (for gases only):Kappa - isentropic coefficient kappa = 1.4 for air and other two atom gas moleculesOther values are calculated using following equations:If flowing fluid is gas, then it is considered as incompressible and ideal.

Orifice Plate Calculation Software