A. 10
B. 20
C. 30
D. 5
Related Mcqs:
- A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?
A. 5 mm
B. 6 mm
C. 8 mm
D. 10 mm - In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm?
A. 3-5
B. 5-11
C. 8-15
D. 12-18 - The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?
A. Equal to
B. Twice
C. Four times
D. Half - Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if___________________?
A. Plain carbon steel and cast iron parts are used
B. Wall thickness is > 30 mm
C. Material of construction is high alloy steel
D. Both B. & C. - In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?
A. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe
conditions it is 3 mm
C. For internal cover and tube sheet is provided on both the sides
D. All A., B. & C. - Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about ______________ percent of the total thickness?
A. 1 to 5
B. 10 to 20
C. 30 to 40
D. 40 to 50 - Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
A. 16
B. 19
C. 28
D. 38 - The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?
A. Equal to
B. More than
C. Less than
D. Either B. or C.; depends on maximum permissible internal pressure - For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?
A. Decreases upwards
B. Increases upwards
C. Remains same throughout
D. May decrease or increase upwards depending upon whether vacuum or positive pressure
would be maintained inside the shell - Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________?
A. More
B. Less
C. Same
D. Either A. or B.; depends upon the I.D. of the pipe
