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Unformatted text preview: 1 of 22 CHE 3013 Rate Operations I Fall 2011 Homework 3 Due: Friday, September 12, 2011 6 Problems, 18 points total 1. (3 points) Estimate the pressure drop for acetic acid ( = 64.2330 lb m /ft 3 , = 0.9311 cP) flowing at 40 gpm through a 1 in Schedule 40 stainless steel pipe system. The total system contains 600 ft of pipe, three standard elbows, two open gate valves, and one control valve ( K = 7.5). There is no change in elevation. 2. (3 points) A sampling valve is attached to a 6 in pipe carrying acrylic acid at 30 psig ( = 64.37 lb m /ft 3 , = 0.8853 cP) as shown in the sketch below. After taking a sample, the operator cannot fully close the valve, and it remains ~ open ( K = 100). Estimate the amount of acrylic acid released during the 5 minutes it takes the operator to cap the pipe. in globe valve 6 in Schedule 40 steel pipe 2 in 2 in in Schedule 40 pipe 2 in 2 of 22 3. (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 6.72x104 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) 4. (3 points) A highlevel 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. Will the basin overflow? 5. (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. 3 of 22 6. (3 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 nhexane. The maximum flow rate is expected to be 75 gpm with = 40.240 lb m /ft 3 and = 0.2643 cP. (a) For a differential pressure of 100 inH 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. 4 of 22 Problem 1 Estimate the pressure drop for acetic acid ( = 64.2330 lb m /ft 3 , = 0.9311 cP) flowing at 40 gpm through a 1 in Schedule 40 stainless steel pipe system. The total system contains 600 ft of pipe, three standard elbows, two open gate valves, and one control valve ( K = 7.5)....
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 Fall '11
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