Energy Absorption Calculations

The tables below gives the no damage limit of a single SlowStop bollard when impacted 20" / 50cm above ground. A rigid connection of multiple SlowStop bollards can be calculated below the table for various connection distances.

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Imperial Metric

SS3Y-42 3" SlowStop® Mass (lb.) Speed (mph)
Tube diameter ø3"x 0.2" 500 8.5
1,195 ft.-lb. 750 6.9
1,000 6.0
1,500 4.9
2,000 4.2
3,000 3.5
5,000 2.7
10,000 1.9
SS4Y-42 4" SlowStop® Mass (lb.) Speed (mph)
Tube diameter ø4" x 0.25" 500 10.9
1,967 ft.-lb. 1,000 7.7
2,000 5.4
3,000 4.4
5,000 3.4
6,000 3.1
7,000 2.9
10,000 2.4
11,000 2.0
SS5Y-42 5" SlowStop® Mass (lb.) Speed (mph)
Tube diameter ø5" x 0.255" 1,000 12.4
5,163 ft.-lb. 3,000 7.2
5,000 5.6
10,000 3.9
15,000 3.2
20,000 2.8
40,000 2.0
SS6Y-42 6" SlowStop® Mass (lb.) Speed (mph)
Tube diameter ø6.63" x 0.32" 1,100 16.2
9,536 ft.-lb. 2,000 11.9
3,000 9.7
4,000 8.4
5,000 7.5
7,500 6.2
10,000 5.3
15,000 4.4
20,000 3.8
40,000 2.7
60,000 2.2
80,000 1.9

Calculation of the kinetic energy (in ft.-lb.) for a given mass in pounds and a velocity in fps (1 mph = 1.46 fps), with an impact height of 20"

3" 4" 5" 6"
Type 1 Bollard SlowStop® Mass (kg.) Speed (kph)
1,000 6.5
2,000 4.6
3,000 3.7
4,000 3.2
5,000 2.9
Type 2 Bollard SlowStop® Mass (kg.) Speed (kph)
1,000 8.3
2,000 5.9
3,000 4.8
4,000 4.2
5,000 3.7
10,000 2.6
Type 2.5 Bollard SlowStop® Mass (kg.) Speed (kph)
1,000 13.5
2,000 9.5
3,000 7.8
4,000 6.7
5,000 6.0
10,000 4.3
20,000 3.0
Type 3 Bollard SlowStop® Mass (kg.) Speed (kph)
1,000 18.3
2,000 12.9
3,000 10.6
4,000 9.1
5,000 8.2
10,000 5.8
20,000 4.1
40,000 2.9
1 2 2.5 3
Calculation tables

Calculator

Using more than one bollard? Try the calculator below by entering the specific model you are using, how many bollards, and the distance between each bollard to get an estimated calculation. For more precise calculations, contact us.

Imperial Metric

* Distance in inches

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Mass (lb)
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Speed (mph)
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