Nederman FilterMax DX 3000, Instruction Manual

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DUCT DIMENSIONING AND SYSTEM INSTALLATION

WARNING!

Explosion risk!
Grinding, welding or other hot works
on the filter exterior or inlet must not
be done without cleaning and stopping
the operation.
- Make sure the filter inlet is protected
against possible penetrating explosion.
- Connect a fire alarm to the filter
controling processor, which means the
filter will stop at a possible fire.

30 - 45

°

17

Cleaning access point

Ø 250 / 315 mm

Ø 315 / 400 mm

1 module

2 moduls

3 moduls

Ø 315 / 400 mm

Ø 400 / 500 mm

Ø 400 / 500 mm

Ø 500 mm

Outlet

Inlet

Recommendations

• To avoid pressure losses and dust deposits in the
system it is important to use the correct duct diameter.
The transport velocity shall be at least 15 - 20 m/s for
dust. Take velocity in to account when choosing the
duct diameters. The velocity should never decrease en
route to FilterMax DX. The following duct diameters
can be used for the connection to FilterMax DX.

Flow meter

Nederman
NCF EX fan

Explosion
damper or
explosion
unloader

A > 2,0 m

After cleaning
damper

NB! To adjust the air flow, a
regulating damper in the clean
air duct can be used.

Nederman NEX D or DX-arm for
extracting dust in environments where
the atmosphere can be explosive

• Use long radius bends.

• Install plenty of cleaning access points in the ducting
system before FilterMax DX.

• If the dust is abrasive it may be necessary to use
thick walled (or rubber coted) material in bends and
other exposed areas.

• To avoid pressure losses the ducting system should
be as short as possible and designed with two or more
branches.

• Use larger diameters on the clean side to reduce
pressure losses.

• Use fire dampers when the duct system is passing
from one fire zone to another. NB! Fire dampers do
not stop explosions! FilterMax DX monitoring system
has an input (JP1-7) for fire alarm which, when
activated, immediately stops the filter and a possible
after cleaning damper (fire damper).

• Install a flow meter between FilterMax DX
and the fan.

• To prevent a self ignition with a following explosion
at a possible filter break down, a safety filter with an
alarm function could be mounted in the duct system
between FilterMax DX and the fan.

• To reduce the risk of striking sparks and explosion
as a result of unknown material coming into the inlet
duct, the following measures could be taken:
- Install an explosion safe pre-separator in the inlet duct.
- Fit the inlet duct with the horizontal length A (see picture
above) of at least 2.0 m.
- Use, if necessary, an inclining vertical duct (approxi-
mately 60

°

 against the horizontal level) to the inlet on

FilterMax DX.