NBBI Authorized Inspector (AI) case studies
NBBI Authorized Inspector (AI) · Put your knowledge to work in context.
The National Board Authorized Inspector commission is issued by The National Board of Boiler and Pressure Vessel Inspectors, headquartered at 1055 Crupper Avenue, Columbus, Ohio, to individuals who perform Code inspections of boilers and pressure vessels on behalf of an authorized inspection agency or an owner-user inspection organization. It is a working credential rather than an academic certificate: it is what allows a qualified individual to carry out the inspection, repair, alteration and pressure relief device work that the ASME construction codes and the NBIC require. The examination is deliberately broad. Candidates are tested on ASME construction requirements, NBIC inspection and repair rules, materials, welding and nondestructive examination, pressure relief devices and certification, and the administrative side of the job - reports, stamping and inspector duties. The NBBI Authorized Inspector (AI) case studies are 5 cases and about 3,262 words.
1Section I Shop Hydro Leak at Tube-to-Tubesheet Weld
During a shop hydrostatic test of a new 60,000 lb/hr, 350 psig saturated-steam packaged boiler built to ASME Section I, the AI observes a weep at a tube-to-tubesheet weld on the front wall after the pressure reaches 525 psig. wall, SA-178 Gr C; the tubesheet is 1.25 in.
719 words, about 4 min2Adding a Nozzle to a PWHT Air Receiver
An owner wants to add a 2 in. NPS 80 nozzle to the top of a horizontal Section VIII Div.
643 words, about 3 min3Steam-Rated Safety Valve on an Air Receiver
ID, 10 ft seam-to-seam Section VIII Div. 1 air receiver has MAWP 150 psig at 200°F.
629 words, about 3 min4Crack in Firetube Boiler Tubesheet Ligament
During the internal inspection of a 1996 packaged firetube boiler, 150 psig steam, 3/8 in. shell, the AI finds a 4 in.
675 words, about 3 min5PQR Thickness Range for a 1.25 in. Shell Seam
1 shop has a groove-weld procedure qualification tested on a 3/8 in. SA-516 Gr 70 plate using GTAW root and SMAW fill.
596 words, about 3 min