§ 34-576. Piping and hydraulics.

(a)

Piping. The piping system shall consist of non-toxic materials and be able to withstand a minimum pressure of 50 pounds per square inch. Piping configuration shall be designed to minimize friction losses. All piping used for pool circulation and manufacturers must meet the standards set forth in the current edition of ANSI/NSF 50, "Circulation System Components and Related Materials for Swimming Pools, Spas/Hot Tubs", or similar criteria approved by the board of health. All pool piping shall bear the National Sanitation Foundation (NSF) seal for potable water and be schedule 40 or greater. Pipe installation shall comply with the applicable local plumbing code and this article. All valves and piping in the equipment room shall be clearly labeled, and water flow direction shall be indicated on exposed piping in the filter room. Piping shall be installed to facilitate complete drainage of the system. Heat bending of any pool piping for installation is prohibited.

(1)

Maximum velocity. Velocity shall not exceed ten feet per second in pressure piping or six feet per second in suction piping.

(2)

Main drain line. The main drain line shall be designed and constructed to accommodate 100 percent of the design flow rate and head loss calculations shall include friction losses of the pipe, fittings and the hair and lint strainer. The size of the main drain pipe shall be continuous throughout the length of the line.

(3)

Skimming system lines. The skimming system lines shall be designed and constructed to accommodate 100 percent of the design flow rate. The flow-through rate of the skimming system, based on the manufacturer's minimum recommendations, shall be used to determine the turnover rate if the turnover rate exceeds the manufacturer's recommendations.

(4)

Waste lines. Pool wastewater shall be connected to an approved sewage disposal system. The backwash waste line shall be no smaller than the size of the pipe exiting the filter for the entire length of the backwash line. Discharge points shall be shown on the plans.

(5)

Piping details. Plans must include complete details of all pool piping. All pool piping shall be supported in accordance with manufacturer's recommendations.

(6)

Unknown total dynamic head. Existing pools utilizing sand filters with an unknown total dynamic head shall be considered to have a minimum of 60 feet of head. Existing pools utilizing diatomaceous earth filters with an unknown total dynamic head shall be considered to have a minimum of 50 feet of head on vacuum systems and 90 feet of head on pressure systems. Existing pools utilizing cartridge filters with an unknown total of dynamic head shall be considered to have a minimum of 50 feet of head.

(7)

Hydraulic calculations. Hydraulic calculations shall be submitted on approved board of health forms together with the pool plans. All pool pipe sizing shall be determined by a friction/flow chart for schedule 40 rigid PVC pipe based on the "Williams and Hazen" formula using a constant of 150 or approved equivalent. If approved, other types of piping shall be sized in accordance with an approved friction/flow chart. A copy of the friction/flow chart and a copy of the chart used to determine equivalent pipe lengths shall be submitted with the plans and specifications for new pool construction or for pool piping modification.

(Ord. No. 09-0120, 1-7-09; Ord. No. 18-0340, Att. A, 5-16-18)