Handy Charts and Formulas for the Pressure Washer Professional
These charts can help you with some of the daily
Formulas | Boiling Point | Hose Friction | Pipe Friction
Nozzle Chart | Natural Gas Supply | Fuel Nozzle | Horse Power Requirements
Saturated Water Substance
(Boiling point of water at various pressures)
P.S.I.
(psia) |
Temperature
°f |
| 30 |
250 |
| 100 |
327 |
| 500 |
467 |
| 3000 |
695 |
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Diesel Fuel Nozzle Chart
(SC & HP Series with standard Hydro Tek coil)
| GPM |
140° rise |
150° rise |
BTU |
| 2 |
1.00 70° B |
1.00 70° B |
172,000 |
| 2.5 |
1.75 80° B |
1.75 80° B |
250,000 |
| 3 |
1.75 80° B |
1.75 80° B |
275,000 |
| 4 |
2.50 80° A |
2.50 80° A |
365,000 |
| 5 |
3.00 90° B |
3.00 90° B |
435,000 |
| 6 |
3.50 90° B |
3.50 90° B |
500,000 |
Nozzle size x 140000= diesel fired BTU @ 100 psi fuel pressure.
°C=.555 (°F - 32) | °F=1.8(°C )+ 32
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Horse Power Requirements (Minimum)
Electric HP = (psi x gpm) / 1460 Gas Engine HP = (psi x gpm) / 1100
| Pressure |
Flow |
Cleaning Units |
Electric HP |
Gas Engine HP |
| 1000 |
2 |
2000 |
1.36 |
1.81 |
| |
3 |
3000 |
2.05 |
2.75 |
| |
4 |
4000 |
2.74 |
3.65 |
| 1200 |
2 |
2400 |
1.64 |
2.18 |
| |
2.5 |
3000 |
2.05 |
2.74 |
| |
3 |
3600 |
2.46 |
3.28 |
| |
4 |
4800 |
3.28 |
4.37 |
| 1500 |
2 |
3000 |
2.05 |
2.73 |
| |
3 |
4500 |
3.08 |
4.1 |
| |
4 |
6000 |
4.1 |
5.46 |
| 2000 |
3 |
6000 |
4.1 |
5.46 |
| |
4 |
8000 |
5.47 |
7.29 |
| |
5 |
10000 |
6.84 |
9.12 |
| 2500 |
3 |
7500 |
5.13 |
6.84 |
| |
4 |
10000 |
6.84 |
9.12 |
| |
5 |
12500 |
8.56 |
11.41 |
| 3000 |
4 |
12000 |
6.16 |
8.21 |
| |
5 |
15000 |
10.27 |
13.69 |
| |
6 |
18000 |
12.32 |
16.42 |
| |
10 |
30000 |
20.54 |
27.39 |
| 3500 |
4 |
14000 |
8.22 |
10.96 |
| |
4.5 |
15750 |
10.78 |
14.39 |
| |
5 |
17500 |
11.99 |
15.98 |
| |
6 |
21000 |
14.38 |
19.18 |
| 4000 |
4 |
16000 |
10.95 |
14.6 |
| |
4.5 |
18000 |
12.33 |
16.44 |
| |
5 |
20000 |
13.69 |
18.25 |
| 5000 |
4.5 |
22500 |
15.41 |
20.54 |
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NG Supply Pipe : 450,000 BTU
| Length of run |
Pipe Diameter |
| 0-50 ft |
1 1/4" |
| 51-150 ft |
1 1/2" |
| 151 - 500 ft |
2" |
Please consult your local gas company for relevant building and safety codes for your area
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Nozzle Volume at various pressures (PSI)
| Nozzle Size |
Orifice Dia. |
500 psi |
700 psi |
1000 psi |
1200 psi |
1500 psi |
2000 psi |
3000 psi |
3500 psi |
4000 psi |
5000 psi |
| 2 |
0.034 |
0.71 |
0.80 |
1.00 |
1.10 |
1.20 |
1.40 |
1.70 |
1.90 |
2.00 |
2.30 |
| 3 |
0.043 |
1.05 |
1.35 |
1.50 |
1.60 |
1.90 |
2.10 |
2.60 |
2.85 |
3.00 |
3.30 |
| 3.5 |
0.045 |
1.20 |
1.43 |
1.75 |
1.90 |
2.10 |
2.50 |
2.90 |
3.30 |
3.50 |
3.90 |
| 4 |
0.052 |
1.40 |
1.70 |
2.00 |
2.20 |
2.50 |
2.80 |
3.50 |
3.80 |
4.00 |
4.50 |
| 4.5 |
0.055 |
1.50 |
1.90 |
2.20 |
2.40 |
2.80 |
3.00 |
3.90 |
4.30 |
4.50 |
5.00 |
| 5 |
0.057 |
1.80 |
2.10 |
2.50 |
2.80 |
3.10 |
3.60 |
4.40 |
4.70 |
5.00 |
5.60 |
| 5.5 |
0.060 |
1.90 |
2.30 |
2.80 |
3.00 |
3.40 |
3.80 |
4.80 |
5.20 |
5.50 |
6.20 |
| 6 |
0.062 |
2.10 |
2.50 |
3.00 |
3.20 |
3.70 |
4.20 |
5.20 |
5.60 |
6.00 |
6.80 |
| 6.5 |
0.064 |
2.30 |
2.70 |
3.30 |
3.60 |
4.00 |
4.60 |
5.70 |
6.00 |
6.50 |
7.30 |
| 7 |
0.067 |
2.50 |
2.90 |
3.50 |
3.80 |
4.30 |
5.00 |
6.10 |
6.60 |
7.00 |
7.90 |
| 7.5 |
0.070 |
2.70 |
3.20 |
3.80 |
4.10 |
4.60 |
5.30 |
6.50 |
7.00 |
7.50 |
8.40 |
| 8 |
0.072 |
2.80 |
3.40 |
4.00 |
4.40 |
5.00 |
5.60 |
7.00 |
7.50 |
8.00 |
9.00 |
| 8.5 |
0.074 |
3.00 |
3.60 |
4.30 |
4.60 |
5.30 |
6.00 |
7.40 |
8.00 |
8.50 |
9.60 |
| 9 |
0.076 |
3.20 |
3.80 |
4.50 |
5.00 |
5.50 |
6.40 |
7.80 |
8.50 |
9.00 |
10.10 |
| 8.5 |
0.078 |
3.40 |
4.00 |
4.80 |
5.20 |
5.80 |
6.80 |
8.30 |
9.00 |
9.50 |
10.60 |
| 10 |
0.080 |
3.50 |
4.20 |
5.00 |
5.40 |
6.10 |
7.00 |
8.70 |
9.40 |
10.00 |
10.20 |
| 12 |
0.087 |
4.20 |
5.00 |
6.00 |
6.40 |
7.30 |
8.40 |
10.30 |
11.20 |
12.00 |
13.60 |
| 15 |
0.094 |
5.30 |
6.30 |
7.50 |
8.20 |
9.20 |
10.60 |
12.90 |
14.00 |
15.00 |
16.80 |
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Pipe Friction Loss
Pressure Loss in coils in PSI (aprox.)
| GPM |
Diesel Fired |
Natural Gas |
| 2 |
6 |
11 |
| 3 |
13 |
23 |
| 4 |
24 |
43 |
| 5 |
34 |
61.2 |
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Hose Friction Loss
Pressure loss in 3/8" id hose (aprox.)
| Length in feet |
2 gpm |
3 gpm |
4 gpm |
5 gpm |
6 gpm |
7 gpm |
| 100 |
25 |
50 |
90 |
130 |
220 |
300 |
| 200 |
50 |
100 |
180 |
260 |
440 |
600 |
| 300 |
75 |
150 |
270 |
390 |
660 |
900 |
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| Handy Formulas: |
| Water Weight = Pounds = Gallons x 8.3453 |
| Liters = Gallons x 3.785 |
| Gallons = Liters x .2642 |
| bar = psi x .069 |
| psi = bar x 14.5 |
| psi = 4000 x (gpm / nozzle #) |
| gpm = Nozzle # / (psi / 4000) |
| psi = In. HG x .4912 |
| In HG = In H2O x .07355 |
| Cubic Inches = Gallons x 231 |
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These charts are accurate to the best of our knowledge. If you note any discrepancies, please e-mail Webmaster . The above formulas are for information only, Hydro Tek recommends consulting a pressure washer professional for all matters where safety is an issue. |
