Examples of length calculations
9.1 Accommodation of lift movements
To accommodate larger lifting movements, Rattay stainless steel metal hoses are installed in the 180 degree elbow. To calculate the required hose length, proceed as follows:
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9.2 Accommodation of vibrations
Vibrations within machines and aggregates lead quickly to damage in permanently installed pipes. The use of appropriately designed Rattay stainless steel metal hoses or Rattay stainless steel compensators can prevent these problems. Primarily there are two solution options.
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9.3 Accommodation of thermal expansion
Stainless steel metal hoses are slightly elastic in the longitudinal direction. It is possible to reduce the length by max. 0.6%m without compromising the pressure resistance of the hose. Further compression is therefore not allowed.
The following designs are possible to compensate thermal expansion.
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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 here due to the smaller construction length and larger lateral displacement (excessive compression)!
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