By A. Pastuhov (auth.), K. D. Timmerhaus (eds.)

The nationwide Bureau of criteria Boulder Laboratories at Boulder, Colorado once more served because the host for the 1972 Cryogenic Engineering convention. For the Cryogenic Engineering convention it was once like coming horne, for it was once on the NBS Boulder Laboratories that the Cryogenic Engineering convention was once first conceived and held m 1954m reference to the commitment ofthe NBS Boulder Laboratories through President Dwight D. Eisenhower. The Cryogenic Engineering convention IS thankful for the continued aid that the nationwide Bureau of criteria has gIVen through the years, and which used to be increased on July 1, 1971 whilst the NBS Boulder Laboratories assumed the secretariat functionality of the convention from the nationwide Academy of Sciences. as a result of universal pursuits in warmth move, the 1972 Cryogemc Engineering convention labored with the thirteenth nationwide warmth move convention to enhance a joint application m warmth move. A majority ofthe papers offered during this cooperative attempt are incIuded m V olume 18 of the Advances zn Cryogenic Engineerzng throughout the kmd permission ofthe thirteenth nationwide warmth move convention and are acknowl­ edged accordingly.

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Extra info for Advances in Cryogenic Engineering: Proceedings of the 1972. Cryogenic Engineering Conference. National Bureau of Standards. Boulder, Colorado. August 9–11, 1972

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4. This exchanger has two tube-side streams (designated 1-1 and 2-2). The shell-side stream is identified with the 0-0 designation. The tubes are coiled around a core cylinder in a number oflayers and collected at both ends of the exchanger in headers. The co re cylinder gives mechanical stabIiity especially during manufacturing and has to be properly designed. Its minimum diameter is given by the maximum allowable curvature ofthe coiled tube for which no flattening occurs. Successive layers oftubes are wound in opposite directions and separated by spacing strips.

Cryogenic Technology and Scaleup Problems of Very Large LNG Plants 21 Flg. 16 Vlew of a TEAL cryogemc exchanger under constructlOn This program has involved a two million dollar research effort, which resulted in the construction of 30 spool-wound exchangers for SOMALGAZ, the largest having a heat transfer surface area of 140,000 fe and a weight of 240,000 Ib. 5 and 6 atm, are designed for pressures of 6 and 8 atm to prevent loss of the residual refrigerating fluid contained in the piping system whenever the compressors are shut down.

The frequency offormation of critical size nuclei which can grow to macroscopic size, IS given by Iss = A(T) exp( - WrnaJkT) (1) where A(T) IS a proportlOnality factor approxlmately equal to the number of molecules m a umt volume of liqUid and Wrnax = 161C(J3/3(P - P L)2 (2) T. Enger, D. E. Hsrtmsn, sod E. V. Seymour 34 Table I. Critical Embryo Size, Work of Formation, and Steady-State Rate of Bubble Formation at Three Superheats of Ethane Ethane temperature. K Amount of superheat. &TsL' K CntIeal radIUs.

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