Safety Valve Installation - Leser 4401 Instrucciones De Servicio

Operating Instructions
The inspection hole may only be closed if:
• this is permitted by the applicable regu-
lations and standards,
• a prohibited pressure build-up in the
bonnet can be ruled out based on op-
erating experience and regular main-
tenance and inspection of the bonnet
area,
• there is a greater risk of icing of the
bellows.
Closed bonnets with bellows-type designs
must be designed to be depressurised by
suitable means or with permanent pres-
sure monitoring.
If the system is operated at temperatures
greater than 60 °C, then the pressure tap-
ping lines of the supplementary loaded
safety valves must be as long as possible
and have a water seal. The control cabi-
net and actuators must be placed such
that they are not subjected to temperatures
higher than 60 °C (only C).
There is a danger of icing at temperatures
below 2 °C. For lower temperatures, the
control cabinet and pressure tapping lines
must be heated (only C).
Pressure tapping lines must not be blocked.
Locking rails or seals prevent blocks from
being closed (only C).
The control cabinet for the supplementary
loading must be protected against soil-
ing. The control cabinet must be closed.
If soiling cannot be excluded, then an en-
capsulated control cabinet must be used
(only C).
If a safety valve with a bursting disc is
used, then make sure that the safety valve
is not rendered ineffective by the upstream
bursting disc. Structural measures must be
taken to make sure that it is not possible for
the bursting disc to be aligned incorrectly.
Bursting discs may only be used if they sat-
isfy the safety requirements. Evidence that
the bursting discs open fragment-free must
be provided. The enclosed area between
the bursting disc and the safety valve plate
must be depressurised or the pressure
must be monitored.

6.2 Safety Valve Installation

Different installation steps are required, de-
pending on the system and type of safety
valve. Only the essential installation steps
are summarised and given in the following
handling instructions.
The handling instructions are only intended
to provide a rough orientation. Specific de-
tails must be taken from the type-specific
installation guides.
Prerequisites
• Remove protectors on flanges and bon-
net
control threads as well as closing plates
for single pilots and packages.
• The safety valve has been
identified based on the type plate.
• A visual check of the system
has been performed.
• Connections have been
checked for seal tightness.
EN
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