Special Equipment Inspector key terms

The official list that defines which equipment categories and parameter ranges fall under special equipment supervision, so inspectors can decide whether a unit is legally regulated.

The government function of licensing, registering, inspecting, and enforcing requirements on special equipment throughout its life cycle, exercised by the market regulation authority at national and local levels.

The document issued after a unit passes installation supervision inspection and registration, legally permitting the owner to put the equipment into service and to operate it within approved parameters.

A mandatory verification performed during erection or installation of a unit, confirming that construction, materials, welding, and safety devices conform before the equipment may be registered and used.

A recurring in-service examination at intervals set by regulation, intended to detect degradation such as corrosion, cracking, or worn safety devices while the equipment remains in operation.

An in-service examination performed without opening the equipment, covering visible surfaces, insulation condition, supports, safety accessories, and operating records to screen for obvious defects.

An examination carried out inside a boiler, vessel, or pipe after isolation and cleaning, using direct visual and nondestructive techniques to find corrosion, cracks, and deformation on internal surfaces.

A pressure test using water or another liquid at a specified multiple of design pressure, held for a set time, to verify structural integrity and leak tightness of pressure equipment.

A pressure test using compressed gas instead of liquid, permitted only when hydraulic testing is impractical, and requiring extra exclusion zones and controls because stored energy causes violent failure.

The maximum pressure used to size the shell, heads, and reinforcement of pressure equipment at the design temperature, forming the baseline for setting test and operating limits.

The inlet pressure at which a pressure relief valve begins to open under operating conditions, adjusted so the protected equipment never exceeds its maximum allowable working pressure.

A non-reclosing pressure relief device that ruptures at a predetermined pressure, often used alone or upstream of a safety valve where rapid overpressure protection or tight sealing is needed.

A pressure surge caused by sudden changes in fluid velocity in piping, such as rapid valve closure or steam condensation, producing shocks that can crack pipes and damage supports.

An automatic valve that discharges condensate and non-condensable gases from steam lines while retaining live steam, whose failure degrades heat transfer and can cause water hammer.

The cylindrical pressure vessel at the top of a natural circulation boiler that separates steam from water, holds a water reserve, and connects to downcomers and riser tubes.

A direct-reading device, typically glass or mica type, that shows the water level in a boiler drum so operators can confirm level independently of remote indicators.

A safety control that trips the burner or fuel supply when boiler water level falls below a safe limit, preventing overheating and catastrophic failure of heated surfaces.

A control arrangement that prevents or stops operation when a hazardous condition exists, such as an open access door, missing guard, or overspeed condition on machinery.

A mechanical or electronic device that detects an elevator or escalator exceeding its rated speed and triggers the safety gear or braking system to stop the equipment.

A clamping device mounted on the elevator car or counterweight that grips the guide rails when actuated by the overspeed governor, bringing the moving mass to a controlled stop.

Safety gear that applies braking force gradually as it engages, limiting deceleration to protect passengers from injury, and required above specified rated speeds instead of instantaneous type.

An energy-absorbing device at the bottom of an elevator hoistway, either spring or oil type, that cushions the car or counterweight if it travels past the lowest landing.

The free vertical or horizontal distances maintained between the car, counterweight, and hoistway structure, ensuring occupants are not crushed at the extremes of travel.

The maximum mass, including passengers or goods, that a lifting appliance or elevator is designed to carry at rated speed, used to set inspection and test conditions.

The maximum load that a rigging component such as a sling, shackle, or hook is rated to support in a specified configuration, marked on the item and never exceeded.

A multiplier applied to sling tension as the angle between the sling leg and horizontal decreases, showing that flatter legs substantially increase the load carried by each leg.

A proof test applying a specified percentage above rated load to verify structural strength, braking performance, and stability of a lifting appliance before it enters service.

Verification of ride structures, restraints, control systems, and emergency procedures at defined intervals, including daily pre-opening checks and annual comprehensive examinations.

A cable-driven transport system such as a gondola or chairlift carrying passengers in cabins or on chairs, subject to inspection of ropes, grips, brakes, and evacuation provisions.

Examination of running and standing ropes for broken wires, corrosion, diameter reduction, and broken strands, with retirement criteria based on counts within a lay length.

A crack that initiates at a stress concentration and grows under repeated cyclic loading, often starting at weld toes, openings, or corrosion pits and propagating without visible deformation.

Brittle cracking caused by the combined action of tensile stress and a specific corrosive environment, producing branched cracks that can penetrate thick sections with little external evidence.

Loss of ductility and delayed cracking in steel caused by absorbed hydrogen, often introduced during welding, pickling, or cathodic protection, appearing hours or days after loading.

A written document giving the essential variables and detailed steps for making a production weld, supported by a qualification record proving the procedure produces acceptable properties.

The documented evidence that a test weld made to a proposed procedure passed mechanical and nondestructive tests, supporting the welding procedure specification used in production.

Certification that an individual welder can produce sound welds in a given process, position, and material, demonstrated by testing and subject to periodic renewal or requalification.

A nondestructive method using X-rays or gamma radiation to reveal internal discontinuities on film or digital detectors, effective for volumetric flaws such as porosity and incomplete penetration.

A nondestructive method that transmits high-frequency sound into material and analyzes echoes to locate internal flaws, measure thickness, and detect planar defects poorly seen by radiography.

A surface and near-surface method that magnetizes ferromagnetic material and applies iron particles, which cluster at discontinuities such as cracks and lack of fusion.

A surface method applying a visible or fluorescent liquid that seeps into open discontinuities and is drawn out by a developer, revealing cracks in nonporous materials including austenitic steel.

Entry into an enclosed area with restricted access and possible hazardous atmosphere, requiring isolation, gas testing, ventilation, an attendant, and a rescue plan before an inspector goes in.

A procedure that isolates all hazardous energy sources with locks and tags before inspection or repair, preventing accidental startup, energization, or release of stored pressure.

Functional testing of a completed installation, including safety devices, controls, and operating sequences, performed to confirm the equipment works as designed before handover and registration.

A technical evaluation of remaining safe operating life based on inspection findings, material degradation, load history, and design margins, used to decide continued use, repair, or retirement.

The formal record of an inspection stating scope, methods, findings, conclusions, and required actions, signed by the inspector and retained as legal evidence of the equipment's condition.

The documented decision on how an identified nonconformity is handled, such as immediate shutdown, repair, derating, or continued service with monitoring, including verification of corrective action.

A situation where an inspector's financial, personal, or employment ties could bias findings, requiring disclosure and withdrawal from the assignment to preserve impartiality and public trust.

A structured inquiry into an equipment failure or injury that gathers physical evidence, records, and witness accounts to establish cause and prevent recurrence through recommendations.