I I I I Iiiii

0 10 20 30 40 50 60 70 80 CAPACITY, m3/h

FIGURE 2 Performance characteristics for a refueling pump at 3500 rpm (J. C. Company, Inc.)

FIGURE 3 Cryogenic pumps for loading liquid-propelled ICBMs (J. C. Company, Inc.)

standard flanges and stainless steel thermal barrier/distance piece for mounting the pump onto the motor. The pump, originally designed under the space and weight limitations of aircraft service, also fit the requirements of cryogenic pumping in that the low heat capacity and surface area resulted in short cool-down time and low heat leak. Because the pump was also very efficient (Figure 2), the boiloff problem was greatly alleviated. The gas industry welcomed this pump, and it became one of the most popular transfer pumps for loading and unloading tank cars and trailers.

Following the lead set by this pump, several other small manufacturers began building similar pumps. As the industry grew, pumps of larger capacity and higher heads were built, covering the range from 4 gpm (0.9 m3/h), used in transferring liquid from rectifier columns to storage, to more than 5000 gpm (1125 m3/h), used for loading the early liquid-propelled ICBMs during the 1960s (Figure 3). Only one of these latter systems was built. The pumps shown in Figure 3 were about the largest end-suction close-

FIGURE 4 (a) Double-suction cryogenic pump, (b) cross-sectional view (Flowserve Corporation)

FIGURE 4 (a) Double-suction cryogenic pump, (b) cross-sectional view (Flowserve Corporation)

coupled pumps ever built. The pump built to load the Saturn rocket at 10,000 gpm (2250 m3/h) was not close-coupled and was possibly the only double-suction cryogenic pump ever built (Figure 4).

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Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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