FläktGroup Multi-DENCO - Page 70

Medium Connections Multi-DENCO
70 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
If you are unable to install the exhaust line within the pipework limits described in
Tab. 6-6, please contact your local office who can assist with the calculation.
Example Calculation
Therefore;
Allowable pipe length = [A] – ( ( [B] x 5 ) + ( [C] x 3) )
= 20 – ( ( 0.220 x 5 ) + ( 0.132 x 3) )
= 18.504 m
Therefore DN20 pipe size can be used for installation that is LESS than 18.504 m long,
when 5 x 90° elbows and 3 x 45° elbows are used. As this example is 18m, then the
installation meets the requirements. If the pipework installation requirements is longer,
then a larger pipe size must be used.
6.2.11 Tube support (clamping)
It is recommended:
– All tubing should be independently clamped in position using a cushion based
vibration absorption clamps
– Supports should be spaced at no more than 1.5m separation
– A thermal break should be provided between suction pipes and any
support brackets
Pipe Size
mm / DN
Maximum pipework
length (metres)
[A]
For every 90° elbow,
reduce the maximum
pipework length al-
lowed reduces by:
(metres)
[B]
For every 45° elbow,
reduce the maximum
pipework length al-
lowed reduces by:
(metres)
[C]
DN20 20 0.220 0.132
DN22 32 0.242 0.145
DN28 107 0.308 0.185
Tab. 6-6
Pipe Size (DN) 20 mm
Total Length 18 m
Number of 90°Elbows
5pcs
Number of 45°Elbows 3 pcs