Lowara GEMK Serie Instrucciones Para La Instalación Y El Uso página 81

In the case of positive suction head installations (refer to para 10.6.2.2 EN 12845) with more than one service pump, the inlet
lines can be interconnected if fitted with on-off valves so that each pump can still run when another is removed for the purposes
of maintenance. The inlet pipes of the pumps of suction lift installations must NOT be interconnected.
In the case of a jockey pump for a suction lift installation (refer to para 10.6.2.6 EN 12845), the inlet pipe and its fitting/valve
MUST be independent of the one for the main service pumps.
The pumps are equipped with a coupling for the re-circulation pipe, to be connected to a discharge outlet or to the tank in order
to prevent flooding during operation.
3.7 Diaphragm tank
The tanks may be installed over the module or on the floor.
There is a threaded connection for the diaphragm tank on the outlet line of each module, the pre-charge pressure of which must
be 0.2 bar less than the set pressure of the first pressure switch to activate. Checks must be made when the system is shut
down and the pressure discharged, or when the tank is disassembled from the system.
3.8 Expansion joints
Each diesel pump module is provided with a flexible coupling (fig. 2, component 4) assembled on the delivery side of the pump.
Descrizione
1 Motore diesel
2 Pompa
3 Mandata
4 Giunto elastico
5 Antivibrante
GD_JOINT-PIPE_D_DD
Fig 2
DN
.
32 1"1/4
40 1"1/2
50 2"
65 2"1/2
80 3"
100 4"
125 5"
150 6"
200 8"
250 10"
300 12"
350 14"
400 16"
450 18"
500 20"
GD_JOINT_C_TD
Description
Diesel engine
Pump
Delivery side
Expansion joint
Antivibration damper
L A
( mm ) ( mm )
95 8
95 8
105 8
115 12
130 12
135 18
170 18
180 18
205 25
240 25
260 25
265 25
265 25
265 25
265 25
1
2
5
B
( mm ) ( mm )
4
4
5
6
6
10
10
10
14
14
14
16
16
16
16
81
3
4
5
C D
( ° )
8 15
8 15
8 15
10 15
10 15
12 15
12 15
12 15
22 15
22 15
22 15
22 15
22 15
22 15
22 15