FläktGroup Multi-DENCO - Page 64

Medium Connections Multi-DENCO
64 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
6.2.5 Thermal expansion
All pipework, which is subject to changes in temperature, expands and contracts. The
routing and joining of the pipework must be capable of absorbing this movement. An
example of the rate of expansion on a Multi-DENCO unit is as follows:
Pipework with multiple bends and where any straight lengths are short prevents issues
with expansion. If long, straight pipework is unavoidable, the following methods can be
used:
– Expansion loops
–Offsets
– Anacondas (see manufacturer's data sheets for details) must be in accordance with
EN 1736
The expansion loop is usually located on the side of the hottest line.
Expansion loop or offset, as a rule, should be located in the center of distance between
two fastenings.
The height of the expansion loop is normally twice the width. The exception to this rule
occurs when more than one line runs parallel in a common trench. The dimensions of
the loops for the additional line must be increased to allow nesting of the loops.
Pipe Pipe Operating
Temperature
°C
Expansion in 0 °C
Temperature
mm/m
Expansion in 21 °C
Temperature
mm/m
Hot Gas Line
80 1.35 1.00
Liquid Line
45 0.76 0.41
Suction Line
12 0.20 0.15
Tab. 6-4
NOTE!
Avoid mounting pipework brackets close to expansion loop or offsets.