Pool Tip #50: Pool Heater Sizing
Download Pool Tip #50: Pool Heater Sizing (PDF format, 70KB)
| Linear Weights & Measures |
| 1 inch |
1/12 foot, 0.0833, 2.54 centimeters |
| 12 inches |
1 foot, 0.3048 meters |
| 3 feet |
1 yard, 0.9144 meters |
| 5,280 feet |
1 statute mile, 1.609 kilometers |
| 6,076 feet |
1 nautical mile, 1.852 kilometers |
| 1 meter |
39.37 inches, 3.28 feet, 1.094 yards |
| Area and Cubic Weights & Measures |
| 1 square foot |
144 square inches |
| 1 square yard |
9 square feet, 0.836 square meters |
| 1 square meter |
1.196 square yards |
| 1 cubic foot |
1,728 cubic inches |
| 1 cubic yard |
27 cubic feet, 0.765 cubic meters |
| 1 cubic meter |
1.308 cubic yards |
| 1 acre foot |
325,851 gallons |
| Water |
| 1 cubic foot of water |
7.48 gallons, 28.32 liters |
| 1 gallon of water |
8.33 pounds |
| 1 cubic foot of water |
62.4 pounds |
| 1 ppm |
8.3 pounds/million gallons of water |
| 1 ppm |
1 mg/liter |
| 100 microns |
Approx. size of a grain of salt, 0.1 millimeters, 0.0039 inches |
| Liquid Weights & Measures |
| 1 cup |
8 fluid ounces |
| 1 pint |
16 fluid ounces, 0.473 liters |
| 1 quart |
32 fluid ounces, 0.946 liters |
| 1 gallon |
128 ounces, 16 cups, 8 pints, 4 quarts, 3.785 liters |
| 1 pound |
16 ounces |
| 1 liter |
1.057 liquid quarts |
| 1 tablespoon |
3 teaspoons, 1/2 fluid ounce |
| 1 gram |
0.03527 ounces |
| Temperature Conversion |
| Celsius to Fahrenheit |
F° = 9/5 C° + 32 |
| Fahrenheit to Celsius |
C° = 5/9 (F° – 32) |
| Hydraulic Conversions |
| 1 psi |
2.31 feet of head |
| 1 foot of head |
0.433 psi |
| 1 inch of mercury (Hg) |
1.13 feet of water |
| 1 lpm |
0.264 gallons per minute |
| 1 gpm |
3.78 liters per minute |
| Pipe sizing |
[0.32 × flowrate in gpm] ÷ pipe area in2 = feet per second |
| 1 gpm |
0.264 liters per minute |
| 1 lpm |
3.78 gallons per minute |
| Estimating Pool Area & Volume |
| Circle |
V = p r2 D |
| Kidney |
V = (A + B) × L × 0.45 × D |
| Ellipse |
V = (L × W) + p r2 × D |
| Rectangle |
V = L × W × D |
| Oval |
V = [p (A × B)] × D |
| Gauges |
| Dirty Filter |
| Vacuum: |
Down from start–up reading |
| Influent: |
Up |
| Effluent: |
Down |
| Flowmeter: |
Down |
| Blocked suction line, clogged hair & lint strainer |
| Vacuum: |
Up from start–up reading |
| Influent: |
Down |
| Effluent: |
Down |
| Defective pump seal, clogged impeller |
| Vacuum: |
Down from start–up reading |
| Influent: |
No change |
| Effluent: |
No change |
| Restricted return line, partially closed valve |
| Vacuum: |
Down from start–up reading |
| Influent: |
Up |
| Effluent: |
Up |
| Partially closed valve opened |
| Vacuum: |
Up from start–up reading |
| Influent: |
Up |
| Effluent: |
Up |
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