A. General All 8” x 24” castings shall be true to pattern in form and dimensions with component parts fitting together in a satisfactory manner. Gray cast iron shall conform to ASTM A48-83, Class 30B. B. Workmanship Iron castings shall be free from pouring faults, sponginess, cracks, blowholes and other defects in positions affecting their strength and value for service intended. C. Machining Heavy duty, round manhole frames and covers are to be furnished with machined horizontal bearing surfaces. D. Tolerances Dimensional tolerance shall not exceed +/– 1/16th inch per foot, and casting weights shall not exceed +/– 5%. E. Coatings All cast iron frames and covers are to be furnished unpainted and/ or uncoated. F. Cover Name / Dimensions The “STORM” cover shall be made to the exact material/dimensional specifications as the “SEWER” cover. G. Pick Holes No “through” pick holes will be allowed. H. Design Requirements All casting designated "Heavy Duty" will be designed for AASHTO HS20-44 highway wheel loading.
