Post-boost applications

In post-boost applications, the turboexpander operates under generally equalized pressure conditions (i.e., the turboexpander discharge pressure is approximately the same as the compressor inlet pressure). 

Most ethylene plants operate continuously with the expanders operating at or near design conditions. If necessary, due to their unique design characteristics, radial inflow turboexpanders can accommodate a wide range of process conditions without significant losses in thermal or mechanical efficiency. Expanders may be loaded with booster compressors, gear-coupled generators, dynamometers, or other in-plant mechanical equipment such as pumps. In ethylene plants, turboexpanders are typically used in eitlier post-boost or pre-boost applications. 

Phenol (Lip Eyelicf formula) if a full-face phenol peel does not produce adequate results, a second peel can be applied to the areas that did not respond to the first peel. The touch-up can be localized or full-face, if the condition of the skin permits and if there has been a long rest period. Skin regeneration after the second peel is much quicker, there is less edema and post-peel erythema is of a much shorter duration (2 weeks at the most). If a third phenol peel were indicated (in extremely rare cases of very thick skin, patients who smoke, or rapid resumption of facial expressions), it would most often be localized. The author has only once had to do a third phenol peel on the lip and cheek area after inadequate results on skin that was extremely oily and thick. Recovery was even faster after a third application of phenol and there was hardly any erythema. It should be noted that if a second phenol peel can boost inadequate results, a third phenol peel only brings a very slight improvement over the second. 

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