FläktGroup Multi-DENCO, Operation Manual, Page: 56 / 120

Medium Connections Multi -DENCO
56 FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018
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 datasheets for details)
If using expansion loops or offsets, the following minimum dimensions must be obser-
ved:
Fig. 6-3
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. 6-3
Expansion Loops Offset
Tube Outer
Diameter
Size of expansion movement [mm]:
10 20 30 50 70 100
Length (L) of required loop or offset [mm]:
1/2" or 12 mm 200 275 350 425 500 550
5/8" or 16 mm 200 300 375 450 550 650
3/4" or 18 mm 225 325 400 500 600 700
7/8" or 22 mm 225 350 425 550 650 750
1 1/8" or 28 mm 250 375 450 600 700 850
1 3/8" or 35 mm 250 400 475 650 800 900
1 5/8" or 42 mm 275 425 500 700 850 1000
Tab. 6-4