Diameter. Diameter of water main shall be designed to deliver water in adequate quantities and pressures for domestic use under peak consumption conditions and fire fighting in accordance with these Standards. Standard water main diameters shall be 2½ (except Hawaii and Maui), 3 (Kauai only), 4, 6, 8, 12,16, 18 (except Oahu), 20, 24, 30, 36 and 42-inches. Types and classes of mains are as shown in Table 100-4. Table 100-4 - TYPES AND CLASSES OF MAINS Island Ductile Iron Cl. 52 Concrete Cylinder Cl. 150 Or 250 Cl. 150 or 200 PVC C900 Cl. 150 PVC C905 Hawaii 1,10 NA NA NA Kauai 1,8 NA 7 NA Maui 1,4,8 3,4 NA NA Oahu 1,4,9 4,5 2,4 4,6 1 - Mains 4-inch through 42-inch in diameter. 2 - Mains 4-inch through 12-inch in diameter (Cl. 150 = DR 18, Cl. 200 = DR 14). 3 - Mains 30-inch in diameter or larger.
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