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Title: Measurement And Controls Used In Lpg Underground Storage Systems
Author: Neal E. Van Fossan
Source: 1976 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1976
Abstract: There is a basic problem that faces the manufacturer of any product. When is enough enough. The never ending problem of balancing supply with demand. What can be done about production: Shut down?. Cut back? or Stock Pile? What should be done about raw materials supply: Buy at the right time in bulk quantities at minimum price? Or take the gamble they will be available in the quantity and quality needed at the time required and at a tolerable price? This decision making process becomes more complicated when required raw materials have cyclic demand but are a by-product of a system that must produce at a constant rate. Liquefied petroleum gases (LPGs) are a good illustration of the latter situation. Crude oil has a relatively constant demand because of the year around usage of motor fuel and the other derivatives from it. LPGs (ethane, propane, iso-butane, normal butane, and natural gasoline) are extracted from the gas produced with the oil but have quite wide cyclic demand.

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