Process Equipment and Plant Design Questions

• The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
• A/an __________ is used for changing the direction of a pipeline.
• Value of Peclet number = 0, is the representative of
• Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
• For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)
• To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to
• In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
• Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is
• Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is
• The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
• Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from
• 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.
• The LMTD correction factor (FT) is defined as the
• The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.
• Stage efficiency for packed tower varies with the
• The raio, is normally taken as
• The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.
• In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is
• A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design
• Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as