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Handy Charts and Formulas for the Pressure Washer Professional

Handy Charts and Formulas for the Pressure Washer Professional

These charts can help you with some of the daily calculations a pressure washer professional must deal with.

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 Administrator . The above formulas are for information only, Hydro Tek recommends consulting a pressure washer professional for all matters where safety is an issue.
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Hydro Tek

From simple beginnings in 1985, Hydro Tek has grown to become the most trusted name in the pressure washer manufacturing industry.

How did we do it? By continually focusing on quality and reliability as the key to customer satisfaction, and by incorporating the latest technologies into our design and manufacturing processes.

By 1991, we were using computer-aided drafting systems to refine our product designs and improve efficiency. In 1997, we brought the power of computers to the shop floor by incorporating laser-cutting and other CNC manufacturing machinery, and in 2001 we began focusing on improving efficiency through the latest manufacturing techniques. The end result has been superior products delivered at a superior value to our customers. Through the next decade, we look forward to fulfilling our vision of making our products the "obvious choice" for all your industrial and commercial cleaning needs.