# Energy Absorption Calculations

The tables below give the holding power of just one SlowStop Bollard impacts at 20" above ground with a frontal impact. A rigid connection of 2 SlowStop Bollards gives the double holding power when connected within 40". Ask our advice.

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 | |

15,000 | 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"**

Kinetic energy from a moving object: Ekin = 0.5*(m/32.2)*v^2

E

_{abs}; E_{kin}= energy (ft.-lb.)m = mass of the object (lb.)

Test results by the TÜV-TNO report, impact height on 500 mm (20")

Type 1 (3") => E

_{abs}= 1,195 ft.-lb.Type 2 (4") => E

_{abs}= 1,967 ft.-lb.Type 3 (6") => E

_{abs}= 9,536 ft.-lb.(For lower impacts, strength increases, e.g. Type 1 at 12" = 20"/12" = 1.67 x 1,195 ft.-lb. = 1,991 ft.-lb

## Resources

- Energy Absorption Calculations
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- Frequently Asked Questions
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## So far we’ve installed several of the bollards and have been impressed with the durability. We will be installing the remainder in higher traffic, problem areas in the near future.

**- Glenn A.**

## We love them (SlowStop Bollards) and so do the clients.

**- Mike D.**