Chapter 6

• 2 x diameter Minimum airgap for fixtures not affected by side walls in reference to effective opening
• 3 x diameter Minimum airgap for fixtures affected by side walls in reference to effective opening
• 150 mm Minimum distance of Atmospheric Vacuum Breaker (AVB) above all downstream piping and floor level rim of receptor.
• 30.5 cm Minimum space clearance between the lowest portion of the assembly and the grade, floor or platform for access and clearance.
• 30.5 cm Minimum distance of Double Check Valve assembly above all downstream piping and floor level rim of receptor.
• 152 mm Minimum distance of Spill-Proof Pressure-Type vacuum breaker above all downstream piping and floor level rim of receptor.
• 1.52 m Elevation of installations above the floor or grade to be provided with a permanent platform.
• 25 mm Minimum air gap for water distribution, or a minimum of 2 pipe diameters.
• 152mm Installation of atmospheric vacuum breaker above the flood level rim.
• 43.3° C Minimum temperature for backflow prevention device to operate without rendering any portion inoperative.
• 152 mm Minimum height of the AVB critical level above the overflow rim of a water closet bowl or the highest part of a urinal.
• 25 mm Minimum height of ballcock's critical level above the full opening of the overflow pipe.
• 152 mm Minimum installation height of listed non-removable hosebibb-type backflow preventer above the highest point of usage.
• 51 mm or smaller Size of cast iron fittings to be galvanized when used in water piping.
• 8% Maximum lead content for water pipes and fittings
• 14 to 18 Number of mesh per 25 mm for gravity tanks vent screen.
• less than 103 kPa Inadequate water pressure
• more than 551 kPa Excessive water pressure
• 80% Percentage of the reduced pressure used for all pipe size determination.
• 1033 Ра Maximum pressure setting of pressure relief valve.
• 152 mm to 600 mm Height of the drain pipe of pressure relief valve above the ground and pointing downward.
• 0.30 m Distance between bottom of water pipe and top of the sewer or drain line.
• 0.30 m Horizontal distance between the water line and the sewer or drain line.
• 0.30 m Distance between sewer or drainage piping and water pipes crossing above such drainage pipes.
• 0.30 m Maximum distance of unions away from regulating equipment, water heater, conditioning tank or similar.
• 19 mm dia Minimum size of water service pipe.
• 4 feet Maximum intervals of piping supports, based on Chapter 6.
• 3 feet Support trap arms in excess of in length shall be as close as possible
• 1/4 inch Closet rings shall be tightly fastened up to the floor with top surface above finish floor.