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Steam Flow - Orifices

Steam flow through orifices - for steam pressures ranging 2 - 300 psi

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Steam flow rates can be measured by using orifice plates. The diagram below indicates steam flow rate (lb_s/hr) through orifices ranging diameter 1/32" to 1/2" and 2 - 300 psig steam line pressure.

Downstream pressure equals atmospheric pressure.

1 lb/hr = 1.26x10^-4 kg/s
1 psi (lb/in²) = 6,894.8 Pa (N/m²) = 6.895x10^-3 N/mm² = 6.895x10^-2 bar
convert inch to mm

Example - Steam Flow through a 1/4" orifice discharging to the atmosphere - steam pressure 50 psi

By drawing the lines as in the chart above - the discharged steam flow can be estimated to

aprox. 98 lb/h

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Related Topics

Control Valves and Equipment - Sizing and dimensions of control valves & equipment in steam and condensate systems.

Related Documents

Bernoulli Equation - Conservation of energy in a non-viscous, incompressible fluid at steady flow.
Fluid Flowmeters - Comparing Types - An introduction to the different types of fluid flowmeters - Orifices, Venturies, Nozzles, Rotameters, Pitot Tubes, Calorimetrics, Turbine, Vortex, Electromagnetic, Doppler, Ultrasonic, Thermal, Coriolis.
Liquid, Steam and Gas - Flow Coefficients C_v - Calculate flow coefficients for the design of control valves - Imperial units.
Orifice Air Discharge vs. Pressure - Nozzles discharging air volume.
Orifice, Nozzle and Venturi Flow Rate Meters - The orifice, nozzle and venturi flow rate meters makes the use of the Bernoulli Equation to calculate fluid flow rate using pressure difference through obstructions in the flow.
Orifices - Natural Gas Capacity - Capacity of natural gas orifices.
Steam Flow Rate vs. Pressure Drop - Schedule 40 Pipe - Flow rate (lb/h) and pressure drop per 100 feet of pipe.
Steam Leaks through Orifices - Steam leaks through orifices for pressures ranging 250 - 600 psi
Steam Pipes - Online Pressure drop Calculator - Calculate pressure drops in steam distribution pipe lines.

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