A header with 170 psia saturated steam is feeding a pulp stock digester through 10.8 feet of 3-inch Schedule 40 pipe which includes three standard 90 degree elbows and a fully-open standard globe valve. The initial pressure in the digester is 20 psia. a) Determine the initial flow rate in pounds per second. The specific volume of saturated steam at 170 psia is 2.674 ft3/lbm. b) At what digester pressure would the flow transition from sonic to subsonic?

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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A header with 170 psia saturated steam is feeding a pulp stock digester through 10.8 feet of 3-inch Schedule 40 pipe which includes three standard 90 degree elbows and a fully-open standard globe valve. The initial pressure in the digester is 20 psia.

a) Determine the initial flow rate in pounds per second. The specific volume of saturated steam at 170 psia is 2.674 ft3/lbm.

b) At what digester pressure would the flow transition from sonic to subsonic?

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