' The duty of a steam trap is to discharge condensate while not permitting the escape of live steam' No steam system is complete without that crucial component ' the steam trap' ( or trap) . This is the most important link in the condensate loop because it connects steam usage with condensate return. A steam trap quite literally ' purges' condensate, ( as well as air and other incondensable gases) , out of the system, allowing steam to reach its destination in as dry a state/ condition as possible to perform its task efficiently and economically. The quantity of condensate a steam trap has to deal with may vary considerably. It may have to discharge condensate at steam temperature ( i.e. as soon as it forms in the steam space) or it may be required to discharge below steam temperature, giving up some of its ' sensible heat' in the process. The pressures at which steam traps can operate may be anywhere from vacuum to well over a hundred bar. To suit these varied conditions there are many different types, each having their own advantages and disadvantages. Experience shows that steam traps work most efficiently when their characteristics are matched to that of the application. It is imperative that the correct trap is selected to carry out a given function under given conditions. At first sight it may not seem obvious what these conditions are. They may involve variations in operating pressure, heat load or condensate pressure. Steam traps may be subjected to extremes of temperature or even waterhammer. They may need to be resistant to corrosion or dirt. Whatever the conditions, correct steam trap selection is important to system efficiency. It will become clear that one type of steam trap can not possibly be the correct choice for all applications.
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