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

9.4 Ausgleich von parallelem Rohrleitungsversatz Einbauschema S-förmig


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 a greater than 45°, the installation length and nominal length are calculated using the following formulas:



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


z = 50 mm see hose table

r = 310 mm see hose table

l = 95 mm

cos 2 mal 310 minus 50 durch 2 mal 310 = 0.919 ist gleich 23°

NL310 mal w mal 23 durch 90 + 2 (95 + 50) = 831 mm

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