Power Eng 1st Class case studies
Power Eng 1st Class · Put your knowledge to work in context.
The First Class Power Engineer certificate is the highest level of power engineering certification in jurisdictions such as Canada's provinces and territories. It is intended for engineers who already hold lower-class certificates and who aim for senior roles such as chief engineer, plant manager, or engineering consultant. The Power Eng 1st Class case studies are 5 cases and about 3,408 words.
1Superheater Header Replacement with Incomplete Section I Documentation
A 1958-vintage 150 MW reheat boiler is in a 21-day outage to replace the secondary superheater outlet header after repeated ligament cracking. The owner’s engineer proposes to field-fabricate the header from SA-335 P22 pipe and weld it to the existing outlet steam line.
707 words, about 4 min2Low-Load Excess-Air Reduction Causes CO and Flame Instability
A 210 MW natural-gas-fired drum boiler is dispatched at 45% MCR for the evening. To keep NOx below the permit limit of 0.05 lb/MMBtu, the operator trimmed flue-gas O2 from 3.5% to 2.6% and closed the overfire air dampers by 15%.
628 words, about 3 min3Failed Mechanical Overspeed Trip after Turbine Overhaul
A 150 MW extraction-condensing steam turbine has just returned from a major overhaul. During the first roll to synchronous speed, the mechanical overspeed trip is tested by increasing speed with the main stop valve.
682 words, about 3 min4Repeated Fast Bus Transfer Failure on a 6.9 kV Unit Auxiliary Bus
A 500 MW coal-fired unit has a 6.9 kV unit auxiliary bus fed normally from the unit auxiliary transformer. On a UAT differential lockout, the fast bus transfer to the reserve station transformer is initiated.
691 words, about 3 min5Condenser Tube Leak and Sodium Excursion with Caustic Gouging History
A 300 MW subcritical unit has a surface condenser with 304 stainless steel tubes and a divided waterbox. Over 10 days, boiler water cation conductivity rises from 0.08 to 0.65 µS/cm, sodium from 2 to 85 µg/L, and condenser hotwell sodium from 3 to 220 µg/L.
700 words, about 4 min