AK Boiler Operator case studies
AK Boiler Operator · Put your knowledge to work in context.
The Alaska Boiler Operator credential is a state-issued authorization for individuals who supervise the operation of steam and hot-water boilers in commercial, institutional, and industrial plants. It is administered by the Alaska Department of Labor and Workforce Development, Mechanical Inspection Section, and candidates should confirm current application procedures and eligibility requirements directly with that office. The AK Boiler Operator case studies are 5 cases and about 4,038 words.
1Raising Steam Pressure on a 150 psig Firetube Boiler
A 1978 packaged firetube boiler is stamped ASME Section I with a nameplate MAWP of 150 psig saturated steam and a rated capacity of 250 hp (8,625 lb/hr). The burner was replaced two years ago and now fires at a rate equivalent to 300 hp at high fire.
792 words, about 4 min2Low-Water Cutoff Trips While the Gauge Glass Shows Water
A 150 hp, 15 psig steam boiler is on line. It has a float-type low-water fuel cutoff mounted in an external water column, plus a second probe-type cutout with manual reset on the shell.
765 words, about 4 min3High CO at High Fire After Burner Reassembly
A 600 hp natural-gas packaged firetube boiler was retubed, and the burner was cleaned and reassembled by a contractor. On the first firing after the work, at high fire: O2 3.2%, stack temperature 470°F, CO 1,800 ppm (air-free).
815 words, about 4 min4Cold Start of a Watertube Boiler on a Cold Morning
A 60,000 lb/hr, 250 psig D-type watertube boiler has been out of service three weeks for refractory work. Drum metal is at 65°F; the boiler is filled to normal level with treated water at ambient temperature, and the superheater has no desuperheating spray.
801 words, about 4 min5Flame Failure on a Cold Start with Gas Odor at the Burner Front
A packaged gas/oil boiler on a cold start. The operator selects gas; the panel runs its pre-purge, the igniter energizes, the pilot proves, the main flame valve opens, and about 6 seconds later the flame scanner drops out and the burner trips on 'flame failure' before the main flame was well established.
865 words, about 4 min