National Specials

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
30250
100327
500467
3000695

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Diesel Fuel Nozzle Chart
(SC & HP Series with standard Hydro Tek coil)

GPM140° rise150° riseBTU
21.00 70° B1.00 70° B172,000
2.51.75 80° B1.75 80° B250,000
31.75 80° B1.75 80° B275,000
42.50 80° A2.50 80° A365,000
53.00 90° B3.00 90° B435,000
63.50 90° B3.50 90° B500,000

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

PressureFlowCleaning UnitsElectric HPGas Engine HP
1000220001.361.81
330002.052.75
440002.743.65
1200224001.642.18
2.530002.052.74
336002.463.28
448003.284.37
1500230002.052.73
345003.084.1
460004.15.46
2000360004.15.46
480005.477.29
5100006.849.12
2500375005.136.84
4100006.849.12
5125008.5611.41
30004120006.168.21
51500010.2713.69
61800012.3216.42
103000020.5427.39
35004140008.2210.96
4.51575010.7814.39
51750011.9915.98
62100014.3819.18
400041600010.9514.6
4.51800012.3316.44
52000013.6918.25
50004.52250015.4120.54

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NG Supply Pipe : 450,000 BTU

Length of runPipe Diameter
0-50 ft1 1/4"
51-150 ft1 1/2"
151 - 500 ft2"

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 SizeOrifice Dia.500 psi700 psi1000 psi1200 psi1500 psi 2000 psi 3000 psi3500 psi4000 psi5000 psi
20.0340.710.801.001.101.201.401.701.902.002.30
30.0431.051.351.501.601.902.102.602.853.003.30
3.50.0451.201.431.751.902.102.502.903.303.503.90
40.0521.401.702.002.202.502.803.503.804.004.50
4.50.0551.501.902.202.402.803.003.904.304.505.00
50.0571.802.102.502.803.103.604.404.705.005.60
5.50.0601.902.302.803.003.403.804.805.205.506.20
60.0622.102.503.003.203.704.205.205.606.006.80
6.50.0642.302.703.303.604.004.605.706.006.507.30
70.0672.502.903.503.804.305.006.106.607.007.90
7.50.0702.703.203.804.104.605.306.507.007.508.40
80.0722.803.404.004.405.005.607.007.508.009.00
8.50.0743.003.604.304.605.306.007.408.008.509.60
90.0763.203.804.505.005.506.407.808.509.0010.10
8.50.0783.404.004.805.205.806.808.309.009.5010.60
100.0803.504.205.005.406.107.008.709.4010.0010.20
120.0874.205.006.006.407.308.4010.3011.2012.0013.60
150.0945.306.307.508.209.2010.6012.9014.0015.0016.80

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Pipe Friction Loss
Pressure Loss in coils in PSI (aprox.)

GPMDiesel FiredNatural Gas
2611
31323
42443
53461.2

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Hose Friction Loss
Pressure loss in 3/8" id hose (aprox.)

Length in feet2 gpm3 gpm4 gpm5 gpm6 gpm7 gpm
100255090130220300
20050100180260440600
30075150270390660900

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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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Quality & Innovation Since 1985

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.