NCCER Millwright case studies

NCCER Millwright · Put your knowledge to work in context.

NCCER is an independent 501(c)(3) nonprofit education foundation created in 1996 that provides construction industry education, assessments, credentials and accreditation. A millwright credential sits inside that craft-training and assessment system, which NCCER describes as built for industry by industry and delivered through accredited training and assessment programs rather than by a single national test date. The NCCER Millwright case studies are 5 cases and about 4,373 words.

Nitrogen-Blanketed Tank Entry During a Seal Change

You are the millwright lead on a turnaround at a food-processing plant. A 1,200-gallon stainless mixing tank needs its agitator mechanical seal replaced.

671 words, about 3 min 2

Two-Leg Choker Lift of an Offset-CG Skid

A 6,000 lb skid-mounted pump package must be set on a mezzanine 22 ft above grade. The only crane available is a 30-ton hydraulic truck crane; at the final set point the load radius is 26 ft and the capacity chart (outriggers fully extended, no jib) shows 9,400 lb.

885 words, about 4 min 3

Cold Alignment of a 3,600 rpm Motor to a Hot-Growing Pump

A 3,600 rpm, 200 hp motor drives a centrifugal pump through a 6-inch-diameter flexible coupling. Laser alignment, with the motor as the movable machine and a 10-inch sensor separation, shows the motor shaft centerline 0.010 in low at the coupling center, and the motor shaft sloping downward toward its rear at 0.0012 in per inch.

902 words, about 5 min 4

Over-Greased Motor Bearing Running at 205 F

A 100 hp, 3,600 rpm TEFC motor drives a fan by belt. Its drive-end bearing is a single-row deep-groove ball bearing, grease lubricated, on a quarterly PM relubrication route.

907 words, about 5 min 5

Slow, Creeping Clamp Cylinder with a Bypassed Filter

A 20 gpm, 2,500 psi hydraulic power unit supplies the clamp cylinder on a molding press. Operators report the clamp is slow and will not hold, and a part crept 0.020 in during a 3-minute dwell.

1,008 words, about 5 min