The conveying of chips and dust between the capture
device and the machine connection to the CADES (chip
and dust extraction system), especially flexible
connections of moving units, shall follow the requirements
to minimize pressure drop and material build up.
To ensure that the chips and dust extracted from the point
of origin are conveyed to the collection system, the design
of the hoods, ducts and baffles should be based on a
conveying velocity of extracted air in the duct of 20 m s
-1
for dry chips and 28 m s
-1
for wet chips (18 %, or above,
moisture content).
The pressure drop between the inlet of all capture devices
and the connection to the CADES should be maximum
1.500 Pa (for the nominal air flow rate).
NOTE 2 A low dust emission can be expected if the air flow
rate ≥ 850 m
3
h
-1
for saw blade diameter ≤ 315 mm, ≥ 1100 m
3
h
-1
for saw blade diameter between 315 mm and 400 mm and ≥
1400 m
3
h
-1
for saw blade ≥ 400 mm is ensured.
Verification: By checking of drawings, visual inspection
and the following procedure:
∗ Measure the pressure drop at the chosen
air flow rate by measurement under the
condition given for noise measurement in the
relevant C-standard or ISO 7960.
∗ Run the machine (without processing a work
piece) under the conditions for noise
measurement in the relevant C-standard or
ISO 7960. The CADES shall be disconnected.
Check if the machine creates an air flow from
the inlet(s) of the capture device(s) to the
connection outlet(s) to the CADES by use of
smoke at the connection outlet(s).
NOTE 3 For measurement of chip and dust extraction system
performance two standardized methods are useful:
concentration method (EN 1093-9:1998+A1:2008) and index
method (EN 1093-11:2001+A1:2008).
With the exception of 6.3 the requirements of EN 60204-
1:2006 apply unless stated otherwise in this document.
See EN 60204-1:2006, 6.2 for the prevention of electric
shock due to direct contacts and EN 60204-1:2006,
To Next Page
Loading...
