Hall County Environmental Health SWIMMING POOL HYDRAULIC ANALYSIS POOL ADDRESS

Transcription

1 Hall County Environmental Health SWIMMING POOL HYDRAULIC ANALYSIS POOL NAME DATE POOL ADDRESS Shape Perimeter Width Length Min. Depth Break Depth Max. Depth Slope = 1ft in ft Area = Volume = Gunite Poured Other Pipe Material Indoor Outdoor Design Flow Rate = Pool Volume = ( ) Gal. = gpm Turnover time*1 ( ) Min. Check minimum skimmer flow rate. If turnover rate is inadequate for minimum skimmer operation (as per manufacturer or 25 gpm) then design flow rate must be increased to provide minimum skimmer flow rate. I. Number of Skimmers Required: Quantity = # of skimmers required from Rules and Regulations, Chapter , page 25. Surface Area of Pool # of skimmers required # of Skimmers Provided II. Skimmer Flow Rate: A. If wall returns are utilized: Skimmer flow rate = design flow rate x 0.8 = gpm x 0.8 = gpm B. If floor returns are utilized: Skimmer flow rate = design flow rate = gpm Flow through each Skimmer: Skimmer flow for each skimmer = skimmer flow rate (above) = ( )gpm = gpm # of skimmers provided ( ) *2 III. Number of Inlets Required: # of inlets = perimeter = ( ) ft = (Use next whole number) 15 ( 15 ) *1 For pool use min. 6 hr turnover (360 min). For other pools, use table in.07. *2 Must be at least 25 gpm.

2 IV. Pipe Size Selection: 1 A. Skimmer Line Size: Select pipe size which gives min. 4 fps and max. 6 fps velocity at skimmer flow rate. # of skimmers Branch 1 Branch 2 Branch 3 Branch 4 Branch 5 served by pipe Pipe Size Flow in Pipe Velocity (fps) (Indicate which chart used for velocity numbers: ) B. Return Line Size: Select pipe size and branches which give min. 5 fps and max. 10 fps velocity at design flow rate. # of inlets Branch 1 Branch 2 Branch 3 Branch 4 Branch 5 served by pipe Pipe Size Flow in Pipe Velocity (fps) (Indicate which chart used for velocity numbers: ) C. Main Drain Size: Select pipe size which gives min. 4 fps and max. 6 fps velocity at design flow rate. Pipe size: Design flow rate: Velocity (fps): V. Main Drain Grate Selection: Main drain outlet: 4 to 1 open area ratio each drain (Open area required = 4 x s the open area of pipe) **max. 1 ½ fps velocity through grate each drain, two drains required** Pipe Size Grate Size (each) Flow Area (each) Velocity (fps) Total Flow (Both) *Frame & Grate Cat. #: Quantity: 2

3 MAIN DRAIN LINE LOSS If wall returns are utilized: Head loss calculation must be based on: Main drain flow rate = 0.2 x design flow rate = 0.2 x gpm = gpm Straight Pipe Length (Size: ) = # elbows x equiv. length = # of tees x equiv. length = # valves x equiv. length = Total Equiv. Length = Friction loss per 100 x total equiv length / 100 = (enter on page 6) *1 If floor returns are utilized: Head loss calculations are based on 100% flow through skimmers. Skimmer flow rate = design flow rate Main drain flow rate = 0 Main drain head loss = 0 (enter on page 6) *1 Based on above main drain flow rate 3

4 CALCULATE RETURN LINE LOSS State which chart, graph, nomigraph, etc. used: (Add all at the bottom of column) 1. Straight pipe size: gpm Friction loss per 100 x total equiv. length / 100 = ft. 2. Straight pipe size: gpm 3. Straight pipe size: gpm 4. Straight pipe size: gpm 5. Straight pipe size: gpm 6. Straight pipe size: gpm Friction loss due to inlet resistance at gpm = ft. Total Return Line Friction Loss = ft. (enter on pg. 6) (add all totals) 4

5 CALCULATE SKIMMER LINE LOSS State which chart, graph, nomigraph, etc. used: (Add all at the bottom of column) 1. Straight pipe size: gpm 2. Straight pipe size: gpm 3. Straight pipe size: gpm 4. Straight pipe size: gpm 5. Straight pipe size: gpm 6. Straight pipe size: gpm Friction loss due to inlet resistance at gpm = ft. Total Skimmer Line Friction Loss. (enter on pg. 6) (add all totals) 5

6 Total Dynamic Head Required: Main Drain Line Loss (from page 3) Return Line Loss (from page 4) Filter Loss When Dirty* (see below) Skimmer Line Loss (from page 5) Heater Loss Other (Multiport valves, etc.) Total Loss = ft Pump Selection (Submit Curve): Make: Model:, TDH Filter Selection: Backwash rate: TDH** Filter area required = (Design flow rate) = ( ) = (Flow rate/sq ft) ( ) Flow rate per sq ft = Diatomite = 1 gpm per sq ft Hi-rate = 15 gpm per sq ft Sand = 5 gpm per sq ft Cartridge = 0.3 gpm per sq ft Cat. No.: Model: Filter Area: sq ft # of Tanks: Size: Pump Specifications: HP Cycle Phase Volt RPM Certified Contractor: Certification Number: Representing: Approved & Checked By: (Health Dept) Date: * Cartridge Filter = 23.1 ft Sand Filter = 34.7 ft Pressure D.E. = 57.8 ft Vacuum D.E. = 4.3 ** Backwash TDH TDH minus Return Piping and Fixtures + Backwash Line Loss 6