Piping Requirements; Electrical Requirements - Lowara ATEX e-SV Manual De Instalación, Funcionamiento Y Mantenimiento

en - Translation of the original instructions
For information about which value to de-rate the motor with, see
9 .
Pump positions and clearance
Provide adequate light and clearance around the pump. Make sure
that it is easily accessible for installation and maintenance operations,
see Figure 11 .
Installation above liquid source (suction lift)
The theoretical maximum suction height of any pump is 10.33m. In
practice, the following affect the suction capacity of the pump:
• Temperature of the liquid
• Elevation above the sea level (in an open system)
• System pressure (in a closed system)
• Resistance of the pipes
• Own intrinsic flow resistance of the pump
• Height differences
The following equation is used to calculate the maximum height above
the liquid level which the pump can be installed:
(p *10.2 - Z) ≥ NPSH + H + H
b f
p Barometric pressure in bar (in closed system is system pres-
b
sure)
NPSH Value in meter of the pump intrinsic flow resistance
H Total losses in meters caused by passage of liquid in the suc-
f
tion pipe of the pump
H Steam pressure in meters that correspond to the temperature
v
of the liquid T °C
0.5 Recommended safety margin (m)
Z Maximum height at which the pump can be installed (m)
For more information, see Figure 8
(p *10.2 - Z) must always be a positive number.
b
For more information about the performance, see
NOTICE:
Do not exceed the pumps suction capacity as this could cause cavita-
tion and damage the pump.

4.1.2 Piping requirements

Precautions
WARNING:
• Use pipes suited to the maximum working pressure of
the pump. Failure to do so can cause the system to
rupture, with the risk of injury.
• Make sure that all connections are performed by quali-
fied installation technicians and in compliance with the
regulations in force.
NOTICE:
Observe all regulations issued by authorities having jurisdiction and by
companies managing the public water supplies if the pump is connect-
ed to a public water system. If required, install appropriate backflow-
prevention device on the suction side.
Piping checklist
Check that the following requirements are met:
• All piping is independently supported, piping must not place a bur-
den on the unit.
• Flexible pipes or unions are used, in order to avoid transmission
of pump vibrations to the pipes and vice versa.
• Use wide bends, avoid using elbows which cause excessive flow
resistance.
• The suction piping is perfectly sealed and airtight.
• If the pump is used in an open circuit, then the diameter of the
suction pipe is suited to the installation conditions. The suction
pipe must not be smaller than the diameter of the suction port.
• If the suction piping must be larger than the suction side of the
pump, then an eccentric pipe reducer is installed.
• If the pump is placed above liquid level, a foot valve is installed at
the end of the suction piping.
• The foot valve is fully immersed into the liquid so that air cannot
enter through the suction vortex, when the liquid is at the mini-
mum level and the pump is installed above the liquid source.
• Appropriately sized on-off valves are installed on the suction pip-
ing and on the delivery piping (downstream to the check valve) for
regulation of the pump capacity, for pump inspection, and for
maintenance.
16
+ 0.5
v
.
Figure 6 .
Table • In order to prevent back flow into the pump when pump is turned
off a check valve is installed on the delivery piping.
WARNING:
Do not use the on-off valve on the discharge side in the
closed position in order to throttle the pump for more than a
few seconds. If the pump must operate with the discharge
side closed for more than a few seconds, a bypass circuit
must be installed to prevent overheating of the liquid inside
the pump.
For illustrations that show the piping requirements, see

4.2 Electrical requirements

• The local regulations in force overrule these specified require-
ments.
Electrical connection checklist
Check that the following requirements are met:
• The electrical leads are protected from high temperature, vibra-
tions, and collisions.
• The power supply line is provided with:
• A short-circuit protection device
• A high-sensitivity differential switch (30 mA) [residual current
device RCD] to provide additional protection against electric
shock.
• A mains isolator switch with a contact gap of at least 3 mm
The electrical control panel checklist
NOTICE:
The control panel must match the ratings of the electric pump. Improp-
er combinations could fail to guarantee the protection of the motor.
Check that the following requirements are met:
• The control panel must protect the motor against overload and
short-circuit.
• Install the correct overload protection (thermal relay or motor pro-
tector). Thermal and short circuit protection ,must be supplied by
the installer.
• It is the user's responsibility to ensure the equipment does not run
dry. Any control system used to achieve this must comply with the
relevant requirements of EN 13463-6.
• The following devices are recommended for use on the suction
side of the pump:
• When the liquid is pumped from a water system, use a pres-
sure switch.
• When the liquid is pumped from a storage tank or reservoir,
use a float switch or probes.
• When thermal relays are used, relays that are sensitive to phase
failure are recommended.
The motor checklist
WARNING:
• If the motor is equipped with automatic thermal protec-
tors, be aware of the risk of unexpected starts in con-
nection to overload. Do not use such motors for fire-
fighting applications and sprinkler systems.
• Make sure that the control panel and any control devi-
ces are suitable for installation in the selected location.
The regulation in force is the Directive 1999/92/EC-
ATEX 137 regarding the safety and health of personnel
who may be exposed to the risk of explosive atmos-
pheres.
NOTICE:
• Only use dynamically balanced motors with a half-sized key in the
shaft extension (IEC 60034-14) and with normal vibration rate (N).
• The mains voltage and frequency must agree with the specifica-
tions on the data plate.
• Only use three-phase motors whose size and power comply with
the European standards.
In general, motors can operate under the following mains voltage toler-
ances:
Frequency Hz
50
ATEX e-SV Installation, Operation, and Maintenance Manual
Figure 12 .
UN [V] ± %
230/400 ± 10
400/690 ± 10