FLOWSIC100 Operating Instructions
Gas Velocity Monitor
Assembly and Installation
60
©
SICK MAIHAK GmbH · Germany · All rights reserved
88012513/03-2008
3.1.3 Selecting the Flanges with Pipe
The criteria listed in Section 2.3.2 should be used to select the flanges with pipe.
Inside coated ducts The following points must also be taken into account if the inside of the duct/pipeline is
coated (rubber insulation):
• Since the inside of the flange pipes also has to be coated, you might need to select flange
pipes with a greater inside diameter. The minimum distance between the probe pipe and
flange pipe is 3 mm.
• If you cannot use a standard flange with pipe, you must provide your own flanges with
pipe (contact SICK MAIHAK for availability).
• To ensure that the coating is complete, the flanges must be mounted before they are
coated.
Plastic ducts The standard flanges with pipe generally cannot be used for plastic ducts/pipelines. Possi-
ble solutions (to be provided by the customer):
• Glass-fiber-reinforced plastic ducts: laminate the steel core with pitch diameter of the
mounting holes. The inside diameter of the laminated flange pipe must match the select-
ed FLSE100.
• Use flanges with pipe made from duct/pipe material; weld-mount or with plastic adhe-
sive.
• Mount adapter flanges at apertures provided on site.
Determining the nominal length
The required nominal length of the flanges with pipe can be determined using the following
Sections.
Fig. 3.6: Determining the nominal length of the flanges with pipe
L
F
s
L
a
L
e
L
w
L
d
D
A
D
R
w
Di
α
L
α
β
β
α
α
w
β = 90°− α
La
min
D
A
D
R
–()
2
-------------------------
β tan⋅=
L
Fmin
s
D
A
D
R
+()
2
-------------------------
+ 90°α–()tan⋅
w
αsin
----------- -
Le++=
L
Di
αsin
----------- -
2Le Ld–⋅–=
F
F
Lf = Length of flange with pipe (minimum)
Le = Draw-in length (min. 20)
D
A
= Outside diameter of flange
D
R
= Outside diameter of pipe
α = Installation angle
s = Flange thickness = 10
L = Active measuring path (input value)
w = Thickness of duct wall + insulation
Di = Inside diameter of duct
Dimensions in mm
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