NIULPE 4th Class case studies
NIULPE 4th Class · Put your knowledge to work in context.
The NIULPE 4th Class Engineer certification is an entry-level power engineer credential administered through the National Institute for Uniform Licensing of Power Engineers and its member jurisdictions. It is aimed at people who operate or maintain low-pressure heating plants, small steam or hot water boilers, and related auxiliary equipment under supervision, and at those building a pathway toward higher classes. The NIULPE 4th Class case studies are 5 cases and about 4,666 words.
1Gauge Glass Says Two-Thirds, Low-Water Cutoff Says Shut Down
A 400 hp, 125 psig firetube boiler firing natural gas supplies steam to a campus loop. Condensate return runs about 60%, makeup is softened, and feedwater enters at roughly 200°F.
891 words, about 4 min2High Fire Combustion Readings That Do Not Add Up
A 500 hp, 150 psig packaged firetube burns natural gas with forced draft, parallel-positioning fuel/air linkage, and an oxygen trim system. Commissioning data at high fire: 3.0% O2, 400°F stack temperature, 20 ppm CO.
966 words, about 5 min3Centrifugal Chiller Surging at Ninety Percent Load
A 250-ton water-cooled centrifugal chiller using R-134a serves a data hall. Design at full load: condenser water 85°F in and 95°F out with a 3°F condenser approach; evaporator chilled water 54°F in and 44°F out with 40°F saturated suction.
862 words, about 4 min4Condensate Returns Turning the Color of Rust
A 350 hp, 150 psig steam boiler returns about 70% condensate from a process plant. Makeup is softened and tests 0.5 gpg total hardness after regeneration, within design.
954 words, about 5 min5A Weeping Safety Valve and Three Bad Ideas
A 150 psig, 30,000 lb/h steam boiler in a factory is protected by a single ASME-rated safety valve set at 150 psig with a certified capacity of 32,000 lb/h. For two weeks the valve has wept, and a plume is visible at the discharge head.
993 words, about 5 min