Special Equipment Inspector case studies
Special Equipment Inspector · Put your knowledge to work in context.
The Special Equipment Inspector credential certifies professionals who verify the safety of boilers, pressure vessels, piping, elevators, lifting appliances, ropeways, amusement rides, and related equipment. It is intended for engineers, technicians, and regulatory staff who perform statutory inspections, issue reports, and recommend corrective actions. The Special Equipment Inspector case studies are 5 cases and about 4,258 words.
1Boiler returned to service after a tube replacement: hydro test, safety valves and three unexplained low-water trips
A 10 t/h saturated-steam boiler (design pressure 1.25 MPa, operating pressure 1.0 MPa) has been shut down for major repair after 14 water-wall tubes and two economizer tubes were replaced following a bulging failure. For three weeks before the failure the unit logged three low-water trips; each was reset by the shift operator within minutes without any investigation.
919 words, about 5 min2Air receiver with general thinning and a deep pit: thickness calculation, remaining life and derating
A vertical compressed-air receiver has the following data: inside diameter 1800 mm, design pressure 1.6 MPa, design temperature 120 °C, material Q345R, nominal shell thickness 14 mm when new in 2010. The shell is a double-sided butt weld with only spot radiography, so the joint efficiency used in design was 0.85.
872 words, about 4 min3Elevator that moved with the doors open: bypassed door lock, falsified maintenance records and a dead intercom
A 1000 kg / 13-person, 1.75 m/s, 18-stop machine-room-less traction elevator installed in 2016 serves a busy shopping centre. A passenger reported that the car started moving with the doors about 400 mm open.
800 words, about 4 min4Radiography of a 22 mm shell declared 100 %: a Level I signature, a suspicious indication and missing films
A fabricator is completing a 22 mm Q345R vertical shell, inside diameter 2000 mm, design pressure 2.5 MPa, design temperature 120 °C. The A and B butt welds have been declared 100 % radiographed so that a joint efficiency of 1.0 can be used in the thickness calculation.
833 words, about 4 min5Lifting a 9.2 t skid with a two-leg sling: leg loads, off-centre centre of gravity and crane capacity
A 9.2 t compressor skid with four lifting lugs, spaced 3.0 m apart in the lifting direction, must be lifted from a truck and set on a foundation 6 m away. The rigging plan calls for a two-leg sling, each leg a 6×37 wire-rope sling with a 5.0 t working load limit, with an included angle of 70° between the legs; each leg ends in a 4.75 t screw-pin shackle.
834 words, about 4 min