Components Of The Pressure Boosting System; Function Of The Pressure Boosting System - salmson Alti-Nexis V Serie Manuel D'installation Et Mise En Service

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6.2 Components of the pressure boosting system

The complete system is made up of various main
components. The scope of delivery includes sepa-
rate installation and operating instructions for the
operating parts/components. (Also see attached
installation plan)
Mechanical and hydraulic system components
(Fig. 1a, 1b and 1c) :
The compact unit is mounted on a base frame
with vibration absorbers (3). It consists of a
group of 2 to 4 high-pressure multistage centrif-
ugal pumps (1), which are combined by means of
an intake manifold pipe (4) and a delivery mani-
fold pipe (5) to form a complete system. Each
pump is fitted with a (6)bcheck valve on the intake
side, a (7)bcheck valve on the pressure side and a
non-return valveb(8) on the pressure side. A mod-
ule with isolation valves is fitted on the pressure
manifold, which contains a pressure sensorb(12)
and pressure gaugeb(11) (see also Fig. 2a and 2b).
For systems with pumps of the Nexis V and Nexis
VE series, an optional 8-litre diaphragm pressure
vesselb(9) with a throughflow valveb(10) (for
throughflow according to DINb4807-partb5) (see
also Fig.b3) can be fitted to the pressure mani-
foldb(5). For systems with pumps of the Nexis
advens series an optional retrofit kit with an 8-
litre diaphragm pressure vessel is available (see
Fig.b5).
An optional module for low-water cut-out
switchgearb(WMS)b(14) can be fitted or retrofit-
ted to the intake manifold (see Fig.b6a and 6b).
The control device (2) is mounted directly on the
base frame and ready-wired to the electrical com-
ponents of the system. In the case of larger sys-
tems, the control device is accommodated in a
separate free-standing cabinet (SG) and the elec-
trical components are pre-wired to the corre-
sponding connecting cable. For the separate free-
standing cabinet (SG), the final wiring is done by
the customer (see sectionb7.3 and the documen-
tation included with the control device).
The present installation and operating instruc-
tions contain only a general description of the
complete system.
36
Systems with pumps of the Nexis advens series
are equipped additionally with a casing (Fig.b1c,
15a and 15b) around the valves and joint tubing.
High-pressure multistage centrifugal pumps (1):
Different types of multistage high pressure cen-
trifugal pumps are installed in the pressure boost-
ing system depending on the application and the
performance parameters required. Their number
can vary from 2 to 4 pumps. Pumps with built-in
frequency convert-in frequency converters
(NexisbV ) are used. The attached installation and
operating instructions provide information on the
pumps.
Control device (2):
The SC series control device is used to control and
regulate the Alti-Nexis pressure boosting system.
The size and components of the control device
may vary depending on the design and perform-
ance parameters of the pumps. The attached
installation and operating instructions, and the
corresponding wiring diagram provide information
on the control device installed in this pressure
boosting system.
Diaphragm pressure vessel kit (Fig.b3 with
optional retrofitted accessory to Fig. 5):
• Diaphragm pressure vessel (9) with throughflow
valveb(10)
Pressure sensor kit (Fig.b2a and 2b):
• Pressure gauge (11)
• Pressure sensor (12)
• Electrical connection for pressure sensor (12)
• Draining / venting (16)
• Stop valve (17)

6.3 Function of the pressure boosting system

Salmson pressure boosting systems of the series
Alti-Nexis are fitted as standard with non-self-
priming multistage high-pressure centrifugal
pumps with or without built-in frequency con-
verters. These are supplied with water via the inlet
manifold pipe.
Where self-priming pumps are used for special
versions, or generally in the case of suction from
lower-lying tanks, a separate vacuum-proof and
pressure-resistant suction line with a foot valve
must be installed for each pump. The line must rise
continuously from the tank to the system.
The pumps increase the pressure and pump the
water to the consumer via the delivery manifold
pipe. To do this, they are switched on and off or
controlled depending on the pressure. The pres-
sure sensor continuously measures the actual
pressure value, converts it into a current signal and
transmits it to the control device.
Salmson 06/2015