SECTION 52
REINFORCEMENT
396
• Radiographic examinations shall be performed on 25 percent of all complete
joint penetration butt welded splices from a production lot. The size of a
production lot will be a maximum of 100 splices. The Engineer will select the
splices which will compose the production lot and also the splices within each
production lot to be radiographically examined.
• Should more than 12 percent of the splices which have been radiographically
examined in any production lot be defective, an additional 25 percent of the splices,
selected by the Engineer from the same production lot, shall be radiographically
examined. Should more than 12 percent of the cumulative total of splices tested
from the same production lot be defective, all remaining splices in the lot shall be
radiographically examined.
• Additional radiographic examinations performed due to the identification of
defective splices shall be at the Contractor's expense.
• All defects shall be repaired in conformance with the requirements in
AWS D1.4.
• Radiographic examinations will not be required for either shop produced
complete joint penetration butt welds or shop produced resistance butt welded
splices of No. 25 {8} or smaller bars used as spiral or hoop reinforcement.
• In addition to radiographic examinations performed by the Contractor, any
mechanical or welded splice may be subject to inspection or nondestructive testing
by the Engineer. The Contractor shall provide sufficient access facilities in the
shop and at the jobsite to permit the Engineer or his agent to perform the inspection
or testing.
• The Contractor shall notify the Engineer in writing 48 hours prior to
performing any radiographic examinations.
• The radiographic procedure used shall conform to the requirements in ASME
Boiler and Pressure Vessels Code, Section V, Article 2 and the following:
Two exposures shall be made for each complete joint penetration butt
welded splice. For each of the 2 exposures, the radiation source shall be
centered on each bar to be radiographed. The first exposure shall be made with
the radiation source placed at zero degrees from the top of the weld and
perpendicular to the weld root and identified with a station mark of "0." When
obstructions prevent a zero degree placement of the radiation source for the
first exposure, and when approved in writing by the Engineer, the source may
be rotated, around the centerline of the reinforcing bar, a maximum of
25 degrees. The second exposure shall be at 90 degrees to the "0" station mark
and shall be identified with a station mark of "90."
For field produced complete joint penetration butt welds, no more than
one weld shall be radiographed during one exposure. For shop produced
complete joint penetration butt welds, if more than one weld is to be
radiographed during one exposure, the angle between the root line of each
weld and the direction to the radiation source shall be not less than 65 degrees.
Radiographs shall be made by either X-ray or gamma ray. Radiographs
made by X-ray or gamma rays shall have densities of not less than 2.3 nor
more than 3.5 in the area of interest. A tolerance of 0.05 in density is allowed
for densitometer variations. Gamma rays shall be from the iridium 192 isotope
and the emitting specimen shall not exceed 4.45 mm {0.175-inch} in the
greatest diagonal dimension.



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