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7.5. It is necessary on a new installation to preheat 149,000 lb/hr of 34API crude oil from 170F to a temperature of 285F, corresponding

7.5. It is necessary on a new installation to preheat 149,000 lb/hr of 34API crude oil from 170F to a temperature of 285F, corresponding to that of the feed plate of a fractionating tower. There is a utility 33API gas oil line running near the tower at 530F of relatively unlimited quantity. Because the pumping cost for cold gas oil is prohibitive, the temperature of the gas oil from the heat exchanger, returning to the line, should not be less than 300F.

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