Power Eng 4th Class 4B case studies
Power Eng 4th Class 4B · Put your knowledge to work in context.
The 4th Class Power Engineer Part B (4B) examination is one of the two written papers that make up the certification process for fourth class power engineers in Canadian jurisdictions. Part B tests the practical, applied side of the trade: how boilers are built and protected, how combustion and draft are managed, how feedwater is treated, and how pumps, compressors, piping, valves, traps, HVAC, refrigeration, electrical equipment, controls, prime movers and safety requirements fit together in a working plant. Part A, by contrast, focuses on the underlying mathematics, science and theory. The credential suits people entering plant operations, maintenance and process work in buildings, hospitals, food plants, pulp mills, refineries and utility facilities. The Power Eng 4th Class 4B case studies are 5 cases and about 3,958 words.
1Feedwater Heater Bypass and Boiler Carryover
A 150-psig saturated-steam boiler rated at 40,000 lb/h supplies a process plant. The daisy-wheel feedwater heater has been bypassed for three weeks because of a tube leak.
890 words, about 4 min2Forced-Draft Fan Vibration and Combustion Instability
A packaged fire-tube boiler rated at 20,000 lb/h is equipped with a forced-draft fan and a modulating burner. The fan is driven by a 50-hp motor through V-belts.
708 words, about 4 min3Steam Trap Failure in a High-Pressure Drip Leg
A 600-psig, 750°F superheated steam header has a drip leg at a low point, drained by a thermodynamic steam trap. The trap discharges to a flash tank operating at 50 psig.
838 words, about 4 min4Refrigeration Condenser Fouling and Compressor Overload
A 200-ton centrifugal chiller using R-134a serves a comfort-cooling loop. The condenser is water-cooled, with cooling tower water entering at 85°F and leaving at 95°F design.
734 words, about 4 min5Boiler Feedwater Pump Cavitation During Load Swing
A boiler feedwater pump is a horizontal centrifugal pump, rated at 500 gpm at 400 ft head, driven by a 75-hp motor. It takes suction from a deaerator operating at 5 psig (227°F).
788 words, about 4 min