OK Boiler Operator case studies
OK Boiler Operator · Put your knowledge to work in context.
The Oklahoma Boiler Operator License Examination is the state credentialing test for people who operate steam and hot-water boilers in Oklahoma. It is aimed at operators, maintenance technicians, and facility staff who need to demonstrate they can run boiler plants safely and legally under Oklahoma's boiler safety rules. The OK Boiler Operator case studies are 5 cases and about 4,066 words.
1Upsized Burner, Undersized Relief Capacity on a 400 hp Firetube
A 400 hp Scotch-marine firetube boiler at a food plant is stamped for 150 psig with a rated capacity of 13,800 lb/hr saturated steam. Last spring the original 400 hp gas burner was replaced with a 500 hp low-NOx burner whose maximum input is 16,800 MBH - roughly 16,500 lb/hr at this plant's feedwater temperature.
848 words, about 4 min2Drum Level Indication Disagrees After a Transmitter Outage
A 150,000 lb/hr, 750 psig watertube boiler has been back on line for three weeks since a six-day outage. During the outage the differential-pressure drum level transmitter was removed, its reference leg was drained, and the sensing lines were back-flushed.
834 words, about 4 min3Pitting and Scale After a Softener Slides
A 350 hp, 150 psig firetube boiler at a hospital laundry returns about 55% of its steam as condensate. Over 14 months, three tubes have failed on the water side near the front tube sheet, each with deep hemispherical pits beneath a thin black deposit.
764 words, about 4 min4Cold Start After a 14-Month Layup
A 60,000 lb/hr, 350 psig gas-fired watertube boiler was laid up dry for 14 months with the burner and controls left in place. It is now being started for winter.
822 words, about 4 min5Expired Certificate and an Unstamped Pressure-Part Repair at a School
A school district operates a 1948-vintage 200 hp, 125 psig firetube boiler that supplies winter heat to a 42,000 ft² campus. The certificate of inspection posted in the boiler room expired 45 days ago; the business office says the Oklahoma Department of Labor inspector 'hasn't called back' despite two messages.
798 words, about 4 min