(B) 2020/11
4.Installation
7
Before closing the suction and discharge valves, make sure that the pump is
switched-off and has stopped.
4.4.1.
Shut-off valves
Use valves that are EC marked in accordance with the Directive ATEX 2014/34/EU
and in accordance with the manufacturer's instructions and the applicable
national and local regulations.
4.5.
PRESSURIZATION TANK
A pressurisation tank for double mechanical seals must always be pressurised at
between 1.5 and 2.0 bar over the operating pressure of the pump when it is
functioning, even when it is in operation or stopped. See instruction manual for
the mechanical seal and pressurisation container. Check that the instrumentation
leading to the pressurisation tank is appropriate for the work area.
4.6.
ELECTRICAL INSTALLATION
Before connecting an electric motor to the system, check local regulations regarding electric safety and
standards EN 60204-1 and EN 60079-14. Also the motor manual.
This motor should be Atex with adequate
protection for the working environment in which it must run.
Follow the motor manufacturer's indications at all times.
The motor must also be fitted with overload-protection devices suited to its rated
power.
If necessary, install a separate fan, bearing in mind the environment where it will operate (potentially
explosive atmosphere).
The electrical equipment, the terminals and the components of the control systems
may still bear electrical current when powered off. Contact with them can be
dangerous for the operator and the equipment or cause irreparable damage to the
material. The instructions of the manufacturer must be followed strictly in order
to open the motor safely.
Safe-work permits shall be required to handle the equipment in potentially
explosive atmospheres. It is strongly recommended that this type of work is
carried out in non-classified atmospheres (i.e. there must not be an explosive
atmosphere in the location of the pump when it is being handled).
Air must be recirculated to cool the pump motor. Check that there is no other
equipment or surface which may emit additional heat or affect the cooling of the
motor. See the instruction manual of the motor.
The turning direction must be set when the motor is disconnected from the pump,
or when pump is completely primed and, in the case of pressurised cooled or
double mechanical seals, the seal chamber is filled with liquid.
