PRESSURE REGULATOR TEST
PAGE16 REV. 01 2012-MAR-22
ANSUL Fire Suppression/Securing Systems
Operation and Maintenance – Model 100/30
TEMPERATURE CORRECTION CHART
For checking pressure of 23 cu ft (0.65 m
3
), 55 cu ft (1.6 m
3
),
110 cu ft (3.1 m
3
) and 220 cu ft (6.2 m
3
)
ANSUL fire suppression systems use compressed nitrogen as the
expellant gas for the extinguishing agents. Nitrogen cylinders
should be replaced if the pressure is less than 1500 psi @ 70 °F
(103.4 bar @ 21 °C). However, the pressure in the nitrogen
Examples:
1. The nitrogen cylinder on an ANSUL fire suppression system
indicates a pressure of 1450 psi (100 bar) on the pressure
gauge. The temperature at the cylinder is 40 °F (4 °C).
Reference to the chart shows that this is above the ʻʻtempera-
ture correction lineʼʼ and the cylinder does not require replace-
ment.
cylinder varies with changes in temperature. Accordingly, the chart
below has been prepared to determine if the cylinder being
checked contains enough nitrogen to furnish a recommended
operating pressure.
2. The nitrogen cylinder on an ANSUL fire suppression system
indicates a pressure of 1350 psi (93.1 bar) on the pressure
gauge. The temperature at the cylinder is 80 °F (27 °C).
Reference to the chart shows that this is below the ʻʻtempera-
ture correction line.ʼʼ This cylinder should be replaced with a
fully charged nitrogen cylinder.
CYLINDER
PRESSURE
(bar) psi
(124.1) 1800
(117.2) 1700
(110.3) 1600
(103.4) 1500
(96.5) 1400
(89.6) 1300
(82.7) 1200
(75.9) 1100
–65 –40 –20 0 20 40 60 80 100 120 °F
(–54) (–40) (–29) (–18) (–7) (4) (16) (27) (38) (49) (°C)
NITROGEN CYLINDER TEMPERATURE
TEMPERATURE CORRECTION LINE
RECOMMENDED
OPERATING
PRESSURE
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