§ 322. Standard of pressure. The minimum pressure of gas so furnished
or supplied which shall be permitted in any service main in any such
city shall be sufficient to balance a column of water one and one-half
inches in height. The maximum pressure therein allowed shall be an
amount sufficient to balance a column of water three and three-fourths
inches in height, plus an allowance at the rate of one inch for
variation of each one hundred feet of increase in altitude in the
distributing system between the holder and the point of consumption,
except that no maximum pressure shall be prescribed in service mains the
pressure of gas from which is regulated by service governors, supplied
and maintained without charge to consumers.