Advances in Cryogenic Engineering: Proceedings of the 1959 by R. F. Blanks, K. D. Timmerhaus (auth.), K. D. Timmerhaus

By R. F. Blanks, K. D. Timmerhaus (auth.), K. D. Timmerhaus (eds.)

The 1959 Cryogenic Engineering convention Committee is happy to pre­ despatched the papers of the 1959 Cryogenic Engineering convention. we're lucky to have had the collage of California at Berkeley, Ca!., as our host for the 5th nationwide assembly of this sort. The circulate to the West Coast for this previous Cryogenic Engineering convention was once brought on partly by means of the big focus of missile actions that are to be chanced on there. reputation of cryogenic operations and methods within the mis­ sile box is given in lots of of the integrated papers. The college of California used to be definitely wen suited to this type of assembly as this since it was once the following that a lot early paintings was once performed in cryogenics. This pioneering in cryogenics continues to be glaring this day within the operation of the 72-in. bub­ ble chamber on the Lawrence Radiation Laboratory. The Cryogenic Engineering convention salutes the missile and the cryogenic pioneers of the previous day and this day on the collage of California. certain thank you needs to visit Dr. D. N. Lyon from the Low-Temperature Laboratory of the collage of California, who as chairman of the 1959 Cryogenic Engineering convention Committee has labored tirelessly to extend the stature of this convention. vii ACKNOWLEDGMENT The Cryogenic Engineering convention Committee is deeply thankful for the continuing help and curiosity of the subsequent businesses who made the 1959 Cryogenic Engineering convention attainable. Aerojet-General company A. D. Little, Inc.

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Extra info for Advances in Cryogenic Engineering: Proceedings of the 1959 Cryogenic Engineering Conference University of California, Berkeley, California September 2–4, 1959

Example text

Hr. The 65 hr becomes limited by the refrigerator at lower temperatures, which is a buHt-in safety feature. The refrigerator and cool-down rate are weIl matched. The glass is warmed to room temperature in about 50 hr by circulating hydrogen gas through the refrigerator. The rate is faster on warm-up because the surface of the glass is in compression rather than in tension. The main insulating vacuum has been removed safely when the glass is at about 150o K. 6). Because of the %s-in. differential expansion between the stainless steel and the chamber, it is necessary to make the seal after the chamber is cooled to liquid-hydrogen temperature.

And the chamber- side pumpout pressures about 125 fL. This was encouraging. When the chamber was cold the inflation pressure was increased to 200 psig to seal the gasket. I.. These vacuums were measured at the pump manifold while thepumpwas operating. The actual vacuum pressures at the gasket were probably in the millimeter range. l. and its rating was 15 scfm. The chamber was filled with liquid nitrogen and the inflation pressure was increased to 400psig. The chamber was then pressure-tested to an internal pressure of 145 psig (155 psig across the glass).

As a result of the purification of the feed gas, extremely pure gas is present in the low-temperature equipment of the plant and in all recycle streams. The purity of this gas is continuously monitored. Oxygen, especially, must be kept out of the low-temperature part of the system. We have developed a procedure to concentrate and analyze trace impurities as part of normal plant operation, to make sure that trace quantities measured in fractions of a ppm are not being accumulated in the low-temperature parts of the system.

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