(b) Fracture or cracks passing through the shell or hub, except that a single crack at either end of a pipe not exceeding 2 inches in length or a single fracture in the hub not exceeding 3 inches in width nor 2 inches in length will not be deemed cause for rejection unless these defects exist in more than 5 per cent of the entire shipment or delivery.
(c) Blisters or where the glazing is broken or which exceed 3 inches in diameter, or which project more than ⅛ inch above the surface.
(d) Laminations which indicate extended voids in the pipe material.
(e) Fire cracks or hair cracks sufficient to impair the strength, durability or serviceability of the pipe.
(f) Variations of more than ⅛ inch per linear foot in alignment of a pipe intended to be straight.
(g) Glaze which does not fully cover and protect all parts of the shell and ends except those exempted in Sect. 31. Also glaze which is not equal to best salt glaze.
(h) Failure to give a clear ringing sound when placed on end and dry tapped with a light hammer.
(i) Insecure attachment of branches or spurs.
Workmanship and Finish
(29) Pipes shall be substantially free from fractures, large or deep cracks and blisters, laminations and surface roughness.