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3013-11 Hw-3 - Will the basin overflow 3(3 points One...

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CHE 3013 Rate Operations I Fall 2011 Homework 3 Due: Monday, September 12, 2008 4 Problems, 15 points total 1. (3 points) An aqueous waste is transferred in batches from a storage tank to a neutralization basin by gravity flow as shown below. If the solenoid valve fails open, what is the maximum flow rate of waste to the neutralization basin in ft 3 /s? The fluid density and viscosity are 62.4 lb m /ft 3 and 6.72x10 -4 lb m /ft s, respectively. The loss coefficient for the solenoid valve is 7.20. Answer : 0.242 ft 3 /s gv bv bv sv 20 ft dia 16 ft 3 in Sch 40 pipe, 500 ft 8 ft dia 2 ft LAH Notes: bv block (gate) valve gv globe valve sv solenoid valve 8 ft (normally closed) 2. (3 points) A high-level alarm on the neutralization basin is set at 6 feet (2 feet of freeboard), and the estimated response time for an operator to block in the solenoid valve is 10 minutes.
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Unformatted text preview: Will the basin overflow? 3. (3 points) One recommendation to prevent the neutralization basin in Example 4.1 from overflowing is to install a restriction orifice in the piping system to decrease the maximum flow rate. Estimate the maximum orifice diameter. 4. (6 points) An orifice meter with flange taps is to be installed in a 2 inch Schedule 40 steel pipe to measure the flow rate of n-hexane. The maximum flow rate is expected to be 75 gpm with ρ = 40.240 lb m /ft 3 and μ = 0.2643 cP. (a) For a differential pressure of 100 in-H 2 O, what is the orifice diameter to the nearest 0.001 inch? (b) Estimate the permanent pressure loss in psi using a loss coefficient for the orifice. Compare the result to the permanent loss calculated from the ASME formula....
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