International site for Spirax Sarco
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A brief summary of, and advice on, temperature, pressure, flow and level control methods to suit various types of steam applications, with consideration to surplussing control, differential pressure control, and cascade control and installation thereof.
There are many good reasons for reducing (and sometimes maintaining) steam pressure. This tutorial details common applications for direct operating, pilot operated, pneumatic, electric and electropneumatic pressure control systems, including the advantages and disadvantages of each different control method.
Temperature control of the process can be affected using electric, pneumatic, electro-pneumatic and self-acting controls. This Module details some common applications including process vessels, heat exchangers and high temperature fail safe control.
A range of level control systems and methods are used in industry. Systems may be based on the use of floats, probes or even more sophisticated technology. This tutorial studies the use of probes to provide adjustable & non-adjustable on/off control, and modulating control of liquids. Simple flow control applications are also considered.
The service life and accuracy of a control system can be influenced by installation factors. This tutorial discusses the basic important considerations including the positioning of equipment and wiring, radio frequency interference, and protection from the environment.