Pfeiffer Vacuum HILOBE 2704, Operating Instructions Manual

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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
Danger of injury from bursting as a result of high pressure in the exhaust line
Faulty or inadequate exhaust pipes lead to dangerous situations, e.g. increased exhaust pressure.
There is a danger of bursting. Injuries caused by flying fragments, the escaping of high pressure, and
damage to the unit cannot be excluded.
► Route the exhaust line without shut-off units.
► Observe the permissible pressures and pressure differentials for the product.
► Check the function of the exhaust line on a regular basis.
NOTICE
Risk of damage from gas backflow into the roots pump
Due to the backflow of process gas, the electronic equipment is susceptible to irreversible damage
caused by regenerative energy produced with rotation of the piston.
► Equip the vacuum pump with a facility that prevents the backflow of gases.
► Use, e.g. a shut-off facility on the fore-vacuum side and block the line directly after switching off
the vacuum pump.
► As an alternative, use a backing pump with integrated vacuum safety valve.
Required tools
● Ring spanner, WAF 13 with flange DN 160 ISO-F
● Ring spanner,
WAF 30 with flange DN 150 PN16
Condensate separator
Pfeiffer Vacuum recommends installing a condensate separator, with condensate drain at
the lowest point of the exhaust line.
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 scaling, loose particles etc. prior to installation.
3. Route the pipes so that no mechanical stresses 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 vacuum pump, so that condensate does not flow back in.
Installation
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