53 Pa. Stat. § 14804
All cast-iron pipes must be sound, free from holes, and of a uniform thickness, known as "extra heavy" pipe, and corresponding fittings will be required. The pipe must be tested to fifty pounds water pressure, and marked with the maker's name.
Pipes shall weigh as follows, namely:
Two-inch pipe, five and one-half pounds per lineal foot.
Three-inch pipe, nine and one-half pounds per lineal foot.
Four-inch pipe, thirteen pounds per lineal foot.
Five-inch pipe, seventeen pounds per lineal foot.
Six-inch pipe, twenty pounds per lineal foot.
Seven-inch pipe, twenty-seven pounds per lineal foot.
Eight-inch pipe, thirty-three and one-half pounds per lineal foot.
Ten-inch pipe, forty-five pounds per lineal foot.
Twelve-inch pipe, fifty-four pounds per lineal foot.
53 P.S. § 14804