Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 13, Problem 16R
Why should convex weld faces be avoided?
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14.10. A liquor containing 15 per cent
solids is concentrated to 55 per cent
solids in a double-effect evaporator.
operating at a pressure in the second
effect of 18 kN/m². No crystals are
formed. The flowrate of feed is 2.5 kg/
s at 375 K with a specific heat capacity
of 3.75 kJ/kg K. The boiling-point rise of
the concentrated liquor is 6 deg K and the
steam fed to the first effect is at 240 kN/
m². The overall heat transfer coefficients
in the first and second effects are 1.8 and
0.63 kW/m²K. respectively. If the heat
transfer area is to be the same in each
effect, what areas should be specified?
D
A
14.9. A forward feed double-effect vertical
evaporator, with equal heating areas in
each effect, is fed with 5 kg/s of a liquor
of specific heat capacity of 4.18 kJ/kg K.
and with no boiling point rise, so that 50
per cent of the feed liquor is evaporated.
The overall heat transfer coefficient in the
second effect is 75 per cent of that in the
first effect. Steam is fed at 395 K and the
boiling point in the second effect is 373 K.
The feed is heated by an external heater to
the boiling point in the first effect.
It is decided to bleed off 0.25 kg/s of
vapour from the vapour line to the second
effect for use in another process. If the
feed is still heated to the boiling point of
the first effect by external means, what
will be the change in steam consumption
of the evaporator unit? For the purpose of
calculation, the latent heat of the vapours
and of the steam may both be taken as
2230 kJ/kg
Ад
O
correct the shaft misalignment in a cars transmission system, determine the offset distance required to correct the shaft misalignment of 4 degrees in a rotating system. shaft diameter is 4cm.
Chapter 13 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 13 - Why is it important to make sure that an FCA...Ch. 13 - What major safety concerns should an FCA welder be...Ch. 13 - Why should the FCA welding practice plates be...Ch. 13 - Why should the FCA welds be of substantial length?Ch. 13 - What must be done to a shielding gas cylinder...Ch. 13 - What can happen to the wire if the conduit is...Ch. 13 - Why is it a good idea for a new student welder to...Ch. 13 - Why is the curl in the wire end straightened out?Ch. 13 - What problems can a high-feed roller pressure...Ch. 13 - Referring to Table 13-1, answer the following a....
Ch. 13 - What are the disadvantages of beveling plates for...Ch. 13 - What is the maximum plate thickness that an FCS...Ch. 13 - What is the smallest V-groove angle that can be...Ch. 13 - What is the purpose of the root pass?Ch. 13 - Why is the FCA welding process not used for...Ch. 13 - Why should convex weld faces be avoided?Ch. 13 - What bead pattern is best for overhead welds?Ch. 13 - Why is the appearance of the cover pass so...Ch. 13 - What are the visual inspection standard's...Ch. 13 - Why is the backing strip 2 in. (50 mm) longer than...Ch. 13 - Why should there be a space between the plates...Ch. 13 - What would a small notch at the root weld's...Ch. 13 - What changes should be made in the setup for...Ch. 13 - What problem must be overcome if the amperage and...Ch. 13 - How can higher welding speeds help control...Ch. 13 - How can spatter buildup on the welding gun be...
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