Boiler Inspection
What the inspector is looking for
Inspection questions test whether you know who inspects, when, and what they examine. Arkansas uses both internal (waterside/fireside) inspections and external inspections, and a certificate of inspection is issued only after a boiler passes. Know the difference between a certificate inspection (the periodic inspection that keeps the operating certificate valid) and a non-code or special inspection (e.g., after an accident or a change of fuel).
Preparation is half the answer
Before an internal inspection the boiler must be cooled, drained, isolated, and opened at handhole and manhole plates so the waterside can be seen. Traps: questions that describe a boiler still under pressure or with fuel connected - the correct answer is that inspection cannot proceed until lockout/tagout and isolation are complete. Also know that the inspector looks for scale, corrosion pitting, cracking at tube sheets and staybolt areas, and the condition of safety valves and gauge glasses.
Common traps
- Confusing the inspector's authority with the operator's duty: the operator prepares and makes safe; the inspector examines and reports.
- Assuming a hydrostatic test substitutes for an internal inspection - it does not.
- Forgetting that defects found must be corrected and reinspected before the certificate is renewed.
Worked example
A low-pressure heating boiler shows heavy pitting on the waterside near the water line. The inspector does not simply pass it because it holds pressure. Rule of thumb: any pitting that threatens minimum thickness requires evaluation and repair, then reinspection - a hydrostatic test alone does not clear it.