What is the frost pattern visible on the outside of a portable liquid cylinder?
A. The pressure building (PB) and vaporizer coils are soldered inside the skin of the outer tank jacket and used as a means of heat transfer to boil (vaporize) the liquid. Cold liquid travels through the coils either for pressure building or for gas (product) withdrawal use. [Liquid is vaporized in the PB coil and the expanding vapor is directed back into the top of the inner vessel (ullage space) to raise its internal pressure; or the gaseous product is directed to the gas USE valve, ready for most applications.] The frost is a natural condensation and freezing of water vapor in the air that accumulates along the spiral path of these coils.
