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GP+GP – Maintenance book Pag.7 of 43
OPERATING INSTRUCTIONS
A. Description
A.1 Operating principle :
GEV vacuum groups GP+GP or GPx2 are assembled with two or more oil-sealed rotary vanes
vacuum pumps, single stage, type GP. Each vacuum group is calculated and manufactured in order
to work with one vacuum pump with technical datas enough for the vacuum application. A second
pump, installed in stand by, will start-up whenever the vacuum level won’t be keep with just one
pump in working. Two vacuum switches will give the start and the stop to each pump in relation to
the vacuum level adjusted on the instruments. However, a standard vacuum group is verify to work
between –550 and –700 mmHg vacuum. An electric selector is assembled to the electric panel
board to select which pump use as working and stand by. A suggest is to select the pump priority
checking the hourconters on the panel board, in order to allow the same number of working hours
for each pump. If asked, the electric panel board can be supplied with time-automatically pumps
inversion.
Warning
The GP vacuum pump are not engineered for pumping aggressive, corrosive,poisoned,
inflammable or explosive gases. These vacuum pumps cannot operate in explosive, inflammable or
classified under this standard environments.
In case of any doubt, contact GEV.
Beware
GP cannot suct gases containing liquid or solid substances. All precations shall have to be taken in
case of this situation.
In case vacuum pump should run in dusty environment it is recommended to fix it with an
additional filter, properly sized. In some applications, It is worthwhile to mount an oil-sump filter
(GFOP) together with a cartridge filter in the following manner : vacuum pump, oil-sump filter,
cartridge filter – intake. In case of any doubt, contact GEV
A.2 Main parts into the vacuum system
No.2 Oil lubricated vane vacuum pumps GP with internal no-return valve
No.2 vacuum switch to start/stop the pumps automatically
No.2 inlet filter to protect the pumps against dust
No.2 manual exclusion valve to allow standard maintenance operation
No.1 electric panel board
No.1 vacuum tank (horizontal or if asked vertical)
No.1 outlet common piping complete of outlet liquid trap.
