Table Of Residual Risks For Potentially Explosive Atmospheres - PIETRO FIORENTINI FE Series Manual

3.3.2 - TABLE OF RESIDUAL RISKS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES

Table 3.11 shows the conditions that can lead the pressure regulators SERIES FE to generate a potentially explosive
atmosphere.
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",
where no effective ignition sources must be present, as there are residual risks that potentially explosive
atmospheres may be generated.
Operating
conditions
First start-up
Operation in
normal conditions
Breakage of
diaphragms
Breakage of other
non-metallic parts
(malfunction)
LOW-PRESSURE GAS REGULATOR
EN
Use, maintenance and warning manual
Potentially
explosive Regulatory References
atmosphere
• During the production cycle, the
external sealing of the equipment
is checked according to the UNI
11655:2016 standard.
• Before commissioning, the ex-
ternal sealing of the system
portion on which the equipment
No is installed is checked accord-
ing to the requirements appli-
cable in the place of installation
(when installed in pressure re-
duction
sions of 12186:2014 and UNI
EN12279:2007 must be adhered
to).
The provisions in the previous point
apply and, in addition:
• the equipment is installed out-
doors or in an environment with
natural ventilation according to
the regulations in force in the place
No of installation, or, when applica-
ble, standards EN 12186:2014
and EN 12279:2007;
• is monitored according to the na-
tional rules in force, good prac-
tice and the instructions of the
equipment manufacturer.
This event must be considered a rare
No
malfunction.
This type of malfunction is not rea-
sonably expected as it involves stat-
No
ic seals (to the outside) that cannot
generate any external leakage.
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Management measures
included in the use,
maintenance and warning
manual
The manual refers to the need to
check the external sealing and,
when applicable, meet the require-
ments of the UNI EN 12186:2014
and UNI EN 12279: 2007 stand-
ards.
systems, the provi-
The manual reports that:
•
•
The manual refers to the need to
meet the periodic check require-
ments in accordance with the
regulations in force in the place of
installation.
any room that the equipment
is installed in must meet the
ventilation requirement for the
place of installation, or, when
applicable, the provisions in
standards EN 12186:2014
and EN 12279:2007;
periodic checks must be car-
ried out during surveillance in
accordance with the national
rules in force, if any, and with
the specific manufacturer's
recommendations.
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