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Title: A Mixed Refrigerant LNG Plant For Long Island
Author: E. D. CROUCH,WALTER Linde
Source: American Gas Association 1971
Year Published: 1971
Abstract: THOSE of us who have attended Distribution Conference sessions on LNG duiing the past several years have heard descriptions of a variety of new plants coming onstreani-expander, cascade or mixed refrigerant cycles, metal or prestressed concrete storage tanks, direct or indirect fired vaporizers. There is a limit to the variations possible--a limit to the possible combinations and features which make these plants newsworthy. By these conventional measurements, the LNG plant being erected on Long Island can be described briefly as having a mixed refrigerant cycle, liquefaction capacity of 3 million cubic feet per day, a 600 million cubic foot double-wall aboveground metal storage tank, and three 50 million cubic feet per day water bath vaporizers. In an effort to make this presentation more interesting, the approach will be used of describing the boundary conditions imposed on this plant and how plant design was modified in obtaining a solution consistent with these conditions. The Long Island Lighting Company provides gas service to Nassau and Suffolk Counties and to the Fifth Ward of Queens Counly (a part of New York City), all located on Long Island, New York. Natural gas is received at several locations in ihe western part of the franchise territory. A 350 psig design gas transmission system has been developed over the past 20 years as required to provide adequate gas supply to the gradually developing gas load in the central and eastern portions of the territory. The transmission system supplies distribution systems operating at either 124 psig or 60 psig which in turn supply the customers. Some isolated areas are supplied by low-pressure (7-inch W.C.) distribution systems.

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