AEG Electrolux EHG 679 B Instrucciones de operaciones descargar pdf (Pagina 13)

Operation

2.5 Operation

TRIVAC-B pumps can pump condensable gases and

vapours, provided that the gas ballast valve (7/5) is open

and the pump has attained its operating temperature.

2.5.1 Pumping of Non-Condensable Gases

If the process contains mainly permanent gases, the

pump may be operated without gas ballast, provided that

the saturation vapour pressure at operating temperature

is not exceeded during compression.

If the composition of the gases to be pumped is not

known and if condensation in the pump cannot be ruled

out, run the pump with the gas ballast valve open in

accordance with Section 2.5.2.

2.5.2 Pumping of Condensable Gases and

Vapours

With the gas ballast valve open and at operating tempe-

rature, TRIVAC-B pumps can pump pure water vapour

up to the water vapour tolerance specified by the techni-

cal data. If the vapour pressure increases above the per-

missible level, the water vapour will condense in the oil

of the pump.

When pumping vapours ensure that the gas ballast valve

is open and that the pump has been warmed up for

approximately 30 minutes with the intake line closed.

Vapour phases may only be pumped up to

the permissible limit after the pump has

attained its operating temperature.

During pumping, vapours may dissolve in

the oil. This changes the oil properties and

thus there is a risk of corrosion in the pump.

Therefore, don’t switch off the pump imme-

diately after completion of the process.

Instead, allow the pump to continue opera-

ting with the gas ballast valve open and the

intake line closed until the oil is free of con-

densed vapours. We strongly recommend

operating the TRIVAC-B in this mode for

about 30 minutes after completion of the

process.

In cyclic operation, the TRIVAC-B should not be swit-

ched off during the intervals between the individual wor-

king phases (power consumption is minimal when the

pump is operating at ultimate pressure), but should con-

tinue to run with gas ballast valve open and intake port

closed (if possible via a valve).

Once all vapours have been pumped off from a process

(e.g. during drying), the gas ballast valve can be closed

to improve the attainable ultimate pressure.

2.5.3 Operating Temperature

Proper operation of the TRIVAC-B is ensured in the

ambient temperature range between 12 °C to 40 °C

(55 °F to 104 °F).

At operating temperature, the surface temperature of the

oil case may lie between 40 °C and over 80 °C (104 °F

and 176 °F), depending on the load.

The surface temperature of the TRIVAC-B

pumps may rise above 80 °C.

There is the danger of receiving burns.

GA 01.202/9.02 - 03/96

Attention

Caution

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