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Steam Trap
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A steam trap is a device used to discharge
condensate and non condensable gases while not
permitting the escape of live steam.
Nearly all steam traps are nothing more than
automatic valves. They open, close or modulate
automatically.
The earliest and simplest form of steam trap is the
orifice trap. It consists of simply a disc or short
solid pipe nipple with a small hole drilled through
it installed at the lowest point of the equipment.
Since steam condensate will collect at the lowest
point and this hot liquid is about 1200 times
smaller in volume and denser than live steam,
condensate is effectively removed and steam is
blocked. The problem with orifice traps is the fact
that they do not compensate for varying loads and
pressures. If the condensate load increases, liquid
will back up in the equipment. If the load is light,
then there is little condensate present and live
steam will escape through the orifice. Orifice traps
will not handle or remove non-condensable gases
successfully.
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