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Q. Explain about Napthenic Acid Corrosion?
Some crude oils contain napthenic acids, which, at elevated temperatures, may contribute to more active corrosion with or without the presence of water. The critical temperature at which severe corrosion may occur is significantly lower than if only sulphur was present. Type 316 stainless steel and Inconel 600 show the best degree of corrosion resistance. Type 502 (5% Cr) low alloy steel is useful where there is increased fluid velocity, except in furnace and heat exchanger parts. Stainless steel types 304, 321, and 347 may also be unreliable in these services.
There is some indication that napthenic acid corrosion may be mitigated by passivation of the surfaces with a thiazoline / phosphite mixture at temperatures of 550° - 660°F (200° - 316°C).
Two machining operations, A (3 minutes per part) and B (10 minutes per part), are performed sequentially to manufacture a part. Machines A and B produce 5% and 6% defective items,
tryton cycle
Open cover left crank case and check shifter drum bolt and washer: Check shifter drum bolt torque and washer direction and avail ability.
Hydraulic calculations are carried out by both Process and Mechanical Engineering. Generally speaking, Process Engineering will initiate many hydraulic calculations for piping sys
Adhesives Adhesives are a substance able of holding materials together. A joint is formed among two solids is called adherends with a thin layer of adhesive among them. Mainly
relative motion measuring instrument
The mass flow rate is 28kg/s in an axial flow gas turbine that develops 3.5MW. The stagnation conditions are 780KPa and 730 deg.C. at the entry. At the exit of the nozzle, the stat
Q. Show Hazards associated with plants? Hazards associated with plants will typically include the following: • Inherent fire hazards presented by the release of flammable g
Q. Flange Assembly with Bolt Elongation Measurement? Bolt elongation measurement may be used, with COLT engineering approval, at flanges where Hydraulic Bolt Tensioners are imp
If the expression is quasi-static, determine Q, ΔU and W for the process. In another process the same system expands according to the similar pressure- volume relationship and f
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