NOTICE
Property damage from intake of solid particles
During commissioning, there is a risk of damage to the suction chamber from dirt from the system or
the pipes.
► Use a suitable protective strainer ("start-up strainer") in the intake flange.
► Ensure that this strainer is only removed when the risk of solid particles entering the vacuum
pump can be excluded.
– Observe any pumping speed decrease.
Procedure
1. Degrease the connection flange.
2. Clear welded lines of any tinder, loose parts or similar before installation.
3. Establish the shortest possible connection between the roots pump and vacuum chamber; equiva-
lent to the nominal flange diameter as a minimum.
4. Select a larger nominal diameter for pipe lengths > 5 m.
5. Support or suspend the piping so that no forces from the piping system act on the roots pump.
6. Always use
all
prescribed bolts for fastening the flanges and consider the prescribed pressure
stage for PN 10.
5.6 Connecting the fore-vacuum side
WARNING
Risk of crushing from rotating parts
Fingers and hands may be caught by rotating pistons within the connection flange. This results in se-
vere injuries.
► Keep limbs out of the reach of the roots pump.
CAUTION
Risk of injury from bursting due to high pressure in the exhaust line
Faulty or insufficient exhaust lines cause hazardous situations, e.g. increase in exhaust pressure.
There is a risk of bursting. It is not possible to rule out the risk of injuries due to broken pieces flying
around, high escaping pressure and damage to the equipment.
► Lay the exhaust line without shut-off units.
► Observe the permissible pressures and pressure differentials of the product.
► Check the exhaust line regularly for correct function.
Connecting the fore-vacuum side
1. Choose a minimum pipe cross section equal to the nominal diameter of the pressure flange.
2. Clear welded lines of any tinder, loose parts or similar before installation.
3. Route the pipes such that no mechanical tension can act on the roots pump or the backing pump.
4. Install a bellows in the piping if necessary.
5. Ensure that mating flanges are in a parallel position.
6. Install the pipes downward from the roots pump, so that condensate does not flow back into the
roots pump.
7. Install a condensate separator if necessary.
8. If an air trap is created in the system, then install a condensate drain facility at the lowest point.
5.7 Connecting the gas cooler
Depending on the area of application and requirements of the process, Pfeiffer Vacuum recommends
the use of a gas cooler (optional).
The dimensioning of the gas cooler and the cold gas circulation pipe is the responsibility of the operat-
ing company. As an alternative, Pfeiffer Vacuum can assist you with the authorization of the dimension-
ing.
Installation
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