# 9.4 COMPENSATION OF PARALLEL PIPE DISPLACEMENT

An S-shaped installation by bending the metal hose once is possible in static load cases.

Steps should be taken to ensure that the bending angle is never greater than 45 °C. Where possible, the bending radius should be reduced by using a larger hose length. However, in contrast to point 9.3, no lateral movements over the middle axis are allowed due to the smaller construction length and larger lateral displacement (excessive compression)!

## 9.4 Installation plan

S-shaped

E | mm | installation length |

NL | mm | total length of the metal hose |

r | mm | smallest bending radius |

l | mm | length of a connection part |

a | mm | size of offset |

z | mm | neutral hose end ≈ outer diameter of the selected hose |

bending angle |

## Example 13

The bending angle may not exceed max. 45° on braided hoses (for non-braided hoses up to max. 60°).

In the case of bending angles greater than 45°, the installation length and nominal length are calculated using the following formulas:

## Example

Rattay stainless steel corrugated hose DN 40 type HR I/S, on both sides screw connections made of stainless steel, Fig. 114.

## Operating data

- Offset
**a**= 50 mm

## Calculation

**z** = 50 mm see hose table

**r** = 310 mm see hose table

**l** = 95 mm

**cos** = = 0.919 23°

**NL** = + 2 (95 + 50) = 831 mm

**E** = 2 · 310 sin 23° + 2 (95 + 50) = 532 mm