Gage Determination and Tolerance
The gage shall be determined by the weight of fabricated plates. The average weight of any one lot of plates shall
not underrun the theoretical weight by more than 5%, and no individual plate weighed shall underrun the
theoretical weight by more than 10%.
4.7.2.7 Field Inspection and Acceptance of Plates
a. The field inspection shall be made by the engineer. The manufacturer shall furnish an itemized statement of
the number and length of the plates in each shipment.
b. Each plate included in a shipment failing to meet the requirements of these specifications shall be rejected,
and if 25% of the plates fail to meet the requirements, the entire shipment may be rejected.
4.7.3 FABRICATION (1989)
4.7.3.1 Forming and Punching Plates
a. Plates shall be formed to provide lap joints. The bolt holes shall be so punched that all plates having like
dimensions, curvature, and the same number of bolts per foot of seam, shall be interchangeable. Each plate
shall be curved to the proper radius so that the dimensions of the finished structure will be as specified.
b. Unless otherwise specified, bolt holes along those edges of plates that will form longitudinal seams in the
finished structure shall be in rows 1-3/4 inches apart, with a pair in the valley and crest of the corrugations.
Bolt holes along those edges of the plates that will form circumferential seams in the finished structure shall
provide for a bolt spacing of not more than 9-5/8 inches. The minimum distance from center of holes to the
edge of the plate shall be 1-3/4 times the diameter of the bolt. The diameter of the bolt hole in the
longitudinal seams shall not exceed the diameter of the bolt by more than 1/8 inch.
c. When specified, the structural plate for round pipe shall be formed so as to provide, when assembled, an
elliptical cross section having a vertical elongation of approximately 5%.