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Armstrong Chemtec Group also design and manufacture Process
Liquid Vaporizers which receive Cold Liquid from refrigerated storage. This type
unit is frequently called on to replace or supplement feed to downstream
processing units. These Vaporizers must also have capability to change from an
idling condition to full capacity instantaneously, so as not to result in feed
interruption to downstream users.
The Cold Process Fluid, typically Ethylene at (-100° C/ -148° F), enters the
Vaporizer under pressure, where the liquid is preheated to saturation, fully
vaporized and superheated. These Vaporizers are forced flow, once-through type.
For Ethylene applications pressures may exceed the critical pressure, (730 psia/
50.3 bara).
Armstrong Chemtec Group designs have been proven over many
years of successful operation. Significant design considerations include the
following;
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Response Time - Units are very responsive, i.e. able to adjust
more or less immediately to process changes from 0 to 100% of design load.
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Flexible Coil Construction - This produces minimum levels of
thermal stress and minimum potential for fatigue failure.
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Freeze Proof Construction - Steam condensate is maintained well
above the freeze point of water by proper deployment of internals, proper
venting of inerts and proper removal of steam condensate.
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Materials of Construction - These include Carbon Steel, various
300 Series Stainlesses, Nickel Alloys include Inconel 600 and Incoloy 825 and
many other weldable materials suitable for specific design conditions.
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