24
DIV
AL 600
EN
Use, maintenance and warning instructions
MEDIUM PRESSURE REGULATOR
|
SAFETY
|
REV.
A
3.3.2 - TABLE OF RESIDUAL RISKS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES
“Tab. 3.11” shows the conditions that can lead to the generation of a potentially explosive atmosphere respectively for:
• DIVAL 600 pressure regulator;
• the LA slam-shut valve.
Considering that the silencer does not have active functional parts, in this analysis it is considered an integral part of the
DIVAL 600 regulator.
The table is valid for use with natural gas with a density of no more than 0.8; for different densities, the installation and
environmental conditions must also be evaluated.
WARNING!
If the gas used is a combustible gas, the installation area of the equipment is defined as a “danger zone”
as there are residual risks that potentially explosive atmospheres may be generated.
There must be no effective sources of ignition in “danger zones” and in close proximity thereto.
Operating
conditions
Potentially
explosive
atmosphere
Normative references
Management measures in
-
cluded in the instructions for
use and warning
First start-up
No
• During the production cycle and
before the CE marking according
to Directive 2014/68/EU, the ex-
ternal tightness of the equipment
is checked at a value of 1.1 PS
(in accordance with Standard EN
334).
• Before commissioning, the ex-
ternal tightness of the portion of
the system on which the equip-
ment is installed is checked at a
suitable pressure (in accordance
with standards EN 12186 and
EN 12279).
The instructions for use indicate
the need to meet the requirements
in Standards EN 12186 and EN
12279.
Operation in
normal conditions
No
The indications in the previous point
apply, in addition:
• the equipment is installed out-
doors or in an environment with
natural ventilation (in accordance
with Standards EN 12186 and
EN 12279);
• the installation is subject to sur-
veillance according to current
national rules/good practice/
the equipment manufacturer’s
instructions (in accordance with
the provisions of Standard EN
12186 and Standard EN 12279).
The instructions for use indicate
that:
• any environment in which
the equipment is installed
must meet the requirement of
Standards EN 12186 and EN
12279;
• periodic checks and main-
tenance must be carried out
during surveillance in accord-
ance with the national rules
in force (if any), and with the
specific manufacturer’s rec-
ommendations.
Breakage of the
control head dia-
phragm
(malfunction)
No
This event must be considered a rare
malfunction.
All atmospheric pressure chambers
delimited on at least one side by a
diaphragm must be channelled to
a safe area (in accordance with the
provisions of Standard EN 12186 and
Standard EN 12279).
The instructions for use indicate
the need to meet the requirements
of Standards EN 12186 and EN
12279.
Summary of Contents for Dival 600
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