Instrument and System Design - May 2015

MU Instrumentation Engineering (Semester 8)

Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Explain any Four:

1 (b) Pressure Recovery Factor. 5 marks

1 (c) Piping geometry factor. 5 marks

1 (d) Control valve co-efficient and co-efficient of discharge. 5 marks

1 (e) Calibration technique of thermocouple. 5 marks

2 (a) Size the control valve for following data
Fluid = Benzene Flow=450 GPM D=6? schedule 40
P₁=80 psia, P₂=71 psia, C_d=25, T=52°R, G=0.88. 5 marks

2 (b) Explain IP classification for control panel. 5 marks

3 (a) The following conditions are given with requirement that sound pressure level be below 87dbA
Q=295000 scfh, molecular weight=26.1
P₁=60.5 psia, P₂=30.25 psia, Temperature = 565°R, k=1.41
Pipe Diameter = 6"SCH 40, valve 4" high performance butterfly valve at following conditions FpCv=199, Fp=1, X_TP=0.37=X_T. 5 marks

3 (b) Explain the effect of Flashing and remedies to avoid it. 5 marks

4 (a) A 30° butterfly valve is to be operated under following conditions Fluid = water, flow rate = 25000 GPM P₁=65 psia P₂=49 psia P_v=0.6 psia, Inside diameter = 29.25?. What is the extent of cavitation? 5 marks

4 (b) Explain the effect of Cavitation and remedies to avoid it. 5 marks

5 (a) Design a control valve for following application:
Steam and Water flow at 280°F, Moisture fraction 5 percent, Flow rate W=1600 lb/hr
P₁=29.8 psia, P₂=19.7 psia, D=3?SCH 40 Vf=0.01700 feet³/lb V_g=13.841 feet³/lb, K=1.32, Cd=12.5, F_L=0.86, X_T=0.62. 5 marks

5 (b) Explain any two types of control panel in detail. 5 marks

6 (a) Packing and enclosure design guidelines. 5 marks

6 (b) Explain choked flow condition and compressibility factor for Gas flow condition. 5 marks

Write a short note (Any Two):

7 (b) Explain control room layout and its environment. 5 marks

7 (c) Ergonomics. 5 marks