Speck pumpen V 430 - 1 Operating thresholds

Speck Pumpen Vakuumtechnik GmbH
zertifiziert: DIN EN ISO 9001
Supplementary Operating Instructions for Explosion Protection
2
1 Operating thresholds
Operation as vacuum pump and compressor
Suction pressure p
S
33…1000 mbar
absolute
The suction pressure must be greater by at least 20
mbar than the vapour pressure of the operating
liquid discharging on the pressure side. The
minimum suction pressure described by the
manufacturer-characteristic may not be exceeded.
Compression pressure p
D
800…2600 mbar
absolute
The maximum compression pressure described by
the manufacturer-characteristic may not be
exceeded.
Pressure differential p
D
- p
S
200…1800 mbar The maximum pressure differential described by
the manufacturer-characteristic may not be
exceeded.
Inlet temperature
of the medium to be pumped
Directive 94/9/EC
max. 60 °C
Directive 98/24/EC
max. 120°C
A maximum temperature of 60° applies for
machines to be employed according to Directive
94/9/EC:
Higher temperatures can only be met per Machine
Directive 98/24/EC.
Temperature t
B
of the operating liquid
t
B
= - 20…110 °C The minimum temperature is to be selected so that
a viscosity of 90 mm²/s is not exceeded.
The maximum temperature is to be selected so that
the vapour pressure of the operating liquid
discharging on the pressure side is at least 20 mbar
less than the suction pressure.
Supply pressure p
B
of the operating liquid
p
B
= p
S
+300 mbar
p
B
= p
D
…p
D
+200 mbar
The supply pressure of the operating liquid directly
at the compressor should be at least 300 mbar
above the suction pressure after a maximum of
60 s.
But this may also exceed the compression pressure
maximally by 200 mbar.
Temperature t
S
of the flushing liquid
(double-action slide ring gasket)
t
S
= - 20…110 °C The minimum temperature is to be selected so that
a viscosity of 90 mm²/s is not exceeded.
The maximum temperature must have a minimum
distance of 10 U to the boiling point of the flushing
liquid under process conditions.
Ambient temperature -20°C - +40°C
The minimum allowable pressure on the suction side of the compressor as well as the maximum gas-,
vapour- and liquid-temperatures must make possible a safe distance to the vapour pressure of the
operating liquid independent of the operating liquid and ensure an operation free of cavitation.
Different operating conditions on request.