Instrument and System Design - December 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:

1 (b) Air service unit. 5 marks

1 (c) Cavitation and flashing phenomenon. 5 marks

1 (d) Control room illumination and communication. 5 marks

2 (a) Size the control valve for following data
Fluid = Water flowing at a rate of 2800 gpm
Temp = 15°C,   Pipe diameter=12",   P₁=72.2 psia, P₂=64.1 psia, C_d=17 Valve used is 60° butterfly valve. 5 marks

2 (b) Determine the correct valve size for following data? Also check for flashing
Fluid = Hydrocarbon having specific weight of 36.17 lb/ft³.
W=50000 lb/hr   P_c=591 psia   D=4? scheduled 40
P₁=62.0 psia,   P₂=14.7 psia,   C_d=5
P_VP=38.67 psia,   F_L=0.79 T₁=560°R. 5 marks

3 (a) Size the control valve for following data
Fluid = Air and water,   Pipe diameter = 10? scheduled 40
P₁=50 psia,   P₂=40 psia,   C_d=20
Temp=520°R,   W_g=3000 ib/hr   W_f=150000 ib/hr
F_K=1   X_T=0.38 psia,
Valve used = 60° butterfly valve. 5 marks

3 (b) A valve is required to meet the following conditions
Fluid=CO₂   M=44   K=1.28
T_c=88°f   P_c=1073 psia   T₁=548°R
P₁=557.7 psia   P₂=414.7 psia   D=3? schedule 40
C_d=14   X_T=0.75   Z=0.80. 5 marks

4 (a) Given
P₁=125 psia   P₂=65 psia   Pipe=2? schedule 40
O.D.=2.375?   C_v=35,   X_T=0.70   t=0.154?
Insulation = 1? thermal (4dB/inch)
Location = open area 30? above ground
Find predicted sound pressure level at 1.2 meter downstream of valve and 1 meter horizontally from pipe surface. 5 marks

4 (b) Explain the path treatment of valve noise reduction. 5 marks

Explain selection criteria and design consideration for:

5 (b) Rapture disc and Relief Valve. 5 marks

6 (a) Explain in detail the following phases involved in electronic product design
i) Design Phase
ii) Engineering Phase 5 marks

6 (b) Explain control panel design consideration. 5 marks

Write a short note on:

7 (b) Significance of grounding and shielding. 5 marks