Page 62 - Industrial Plant 2020

Recommendations on standards and design

Low-pressure pumps Fire extinguishing powder nozzles for Local Application

High pressure pumps Fire extinguishing powder nozzles for Local Application

Charging arm Fire extinguishing powder monitor for Local Application
Poorly illustrated fire extinguishing powder nozzles for Local Application inside PSV
Valve vent
Table 1 outlet piping

cold LNG considerably increases evaporation (through (Emergency Shut Down System) shut-off valves and
temperature difference in particular) leading to a tank safety valve discharge piping.
significant vaporization of natural gas and increasing Consequently, the Total Fos LNG site’s key safety
the fire’s intensity (plus the possibility of RPT, Rapid facilities have been refurbished as follows Table.
Phase Transitions, in case of water sprinkling on LNG). Concerning valve vent protection, the risk is poorly
Nevertheless, water curtains should be provided to illustrated and documented in international standards;
reduce the impact of thermal radiation on nearby or hence, designers/manufacturers have to prove (without
adjacent structures. international guideline) the effectiveness of their own
system.
The use of extinguishing powders
is often recommended for rapid Designers/manufacturers have
extinguishing of flames to prove - without international
guidelines - the effectiveness of their
The use of High Expansion Foam (and therefore with own system for valve vent protection,
little water present) can in some cases be considered. as the risk is poorly illustrated
Thus, as recommended by EN 1473 (cf. §13.6) norm, and documented in international
water spraying systems, water curtains, foam standards
generators are prescribed on equipment together with
a fixed protection system with fire extinguishing Within this scope, AI Group have carried out a thorough
powder, which must be installed at possible leakage study in order to extend its expertise on the
points, including LNG pumps, transfer areas, ESD extinguishing of fires with extinguishing powders and

? Pressure = 290 mbarg and more
3

Flare unit
Pressure = 260 mbarg maxi
? ?
2
1

SEND OUT Unloading from tanker

Recondenser High Pressure Pump
Pressure Relief Valve Vaporizer

Fig. 1 Scheme of typical BOG system and flare/Pressure Relief Valve pathways
(pressures given are mentioned only as examples)

IndustrIal Plants - May 2020
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