SYGEF Product Catalogue

Calculating the relevant change in length
The example of an ABS process pipe serves to illustrate
the procedure:
Length of piping from the fixed point to the branch point
where the change in length is to be taken up: L = 8 m.
Installation temperature: T M = 20 °C
Max. working temperature: T 1 = 35 °C
Min. working temperature: T 2 = -20 °C
Expansion of the section during heating
+”L 1 = L Å ”T 1 Å ± = 8 Å 15 Å 0.10 = 12 mm
Contraction during cooling
-”L 2 = L Å ”T 2 Å ± = 8 Å 40 Å 0.10 = 32 mm
Temperature differences
”T 1 = T 1 - T M = 15 °C
”T 2 = T 2 - T M = - 40 °C
Maximum change in temperature chosen
”T = 40 °C
Determining the length of the flexible section for ABS
The values needed to determine the necessary length With these values the required length of the flexible
are:
section can be read off from the diagram for ABS.
The maximum change in temperature from the
0-position (i. e. from the position in which the pipe was
installed). But remember that the pipe could just as well
contract as expand.
The pipe diameter d.
The length of the pipe section L.
Continuing with the example introduced before and
supposing that an ABS pipe with d = 50 mm is installed,
the maximum change in temperature being ”T = 40 °C,
the required length of the flexible section is seen directly
from the diagram to be L B = 1300 mm.
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