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# Steam Flow - Orifices

Steam flow rates can be measured by using orifice plates. The diagram below indicates steam flow rate (lbs/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

## 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 Cv

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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