18-29-606.5.1.1.1 Pressure relief valve.

   Each pump serving such tanks shall have a pressure relief valve on the discharge side capable of relieving water pressure in excess of the designed working pressure of such tanks.

18-29-606.5.1.1.2 Compression tank.

   Each compression tank shall be so connected that the air content thereof shall be no less than 25 percent of its total capacity. Each compression tank shall be provided with a sludge drain pipe which shall be connected to such tank at the lowest level of the bottom section thereof and shall discharge through an indirect connection into the drainage system with a minimum air gap of 6 inches (150 mm).

18-29-606.5.1.1.3 Sludge drain pipe.

   Each sludge drain pipe shall be equal in size to the inlet pipe but need not exceed 2 inches (50 mm) and shall be provided with a control valve having a clear waterway equal in area to that of the sludge drain pipe.

18-29-606.5.1.2 Booster pump system.

   Booster pump systems may be of the constant speed type or the variable frequency drive type. Each pump or pumps shall have sufficient capacity to furnish an adequate supply of water for any purpose. When one pump is installed it shall run continuously or when a multipump system is installed the lead pump shall run continuously. A pressure reducing valve shall be installed on the discharge side of each constant speed pump.

18-29-606.5.1.2.1 Gravity tanks.

   Gravity tanks operating at atmospheric pressure shall be installed as required by Section 18-29-606.5.4.