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How To: Steam Control

Almost every process facility requires steam. It is used for heating, drying, power, etc. Steam is an excellent way to convey energy from one process to another. The heat and energy of the steam needs to be measured and controlled into the next stage of the process.

 

Steam flow and pressure is controlled with an orifice.  You can use a fixed orifice, a line sensed pressure regulator, or a full control valve. There is no adjustment with an orifice. A regulator is given a fixed output setpoint, but is not adjustable by the control system.  A control valve can vary the orifice size according to the output of the control system which has measured the flow, pressure, and/or temperature from process instrumentation and sensors.

 

When controlling system, it is always done with an orifice which creates a pressure drop. The higher the flow rate and pressure drop, the noisier the valve will be. There are two problems with noise. First is the loud environment and potential damage to your hearing. The second is that noise is vibration and that vibration can damage the physical components of the valve. 85dB or lower is the ideal noise level. You can avoid high noise by taking the pressure down in small increments rather than one big drop. This can be accomplished within a control valve or through a fixed drop low decibel cassette inline with the control valve.

 

There is a way to make almost every steam control application low noise and highly reliable. You must select the proper method of controlling and regulating the steam with the proper number of pressure drops. For help with your next steam application, please contact me, Patrick Harlan, or the fine folks at Jasper Engineering.

Patrick Harlan

Patrick Harlan holds a degree in Biological Systems Engineering from the University of Nebraska – Lincoln and has more than 20 years of experience in industrial process control. Patrick works with customers located in Nebraska, Western Iowa, and Southeast South Dakota specializing in process instrumentation, heat trace and controls valves. Patrick’s approach is to specify products and solutions which will better measure, control and optimize your process. 

If you seek to measure efficiencies, obtain tighter control of processes, and increase plant safety, Patrick welcomes your questions at (402) 440-2325 or PHarlan@JasperEng.com