Checking
Nitrogen
Cylinder
Pressures 1
TEMPERATURE CORRECTION CHART
ANSUL
®
fire suppression systems use compressed nitrogen as the expellant for the suppressing agents. The instruc-
tions covering proper inspection and maintenance of this equipment state that the 300 ft
3
(8.49 m
3
) and 400 ft
3
(11.32 m
3
) nitrogen cylinders should be replaced with fully charged cylinders if the pressure is less than 1750 psi
(120.6 bar) at 70 °F (21 °C). However, the pressure in the nitrogen cylinder varies with changes in temperature.
Accordingly, the chart below has been prepared to assist users of ANSUL equipment in determining that the cylinder
being checked contains enough nitrogen to furnish a recommended operating pressure.
Examples:
1. The nitrogen cylinder on an ANSUL fire suppression system indicates a pressure of 1800 psi (124.1 bar) on the
pressure gauge. The temperature of the cylinder is 80 °F (27 °C). Reference to the chart shows that this is above
the ‘‘temperature correction line’’ and the cylinder does not need to be replaced.
2.
One of the nitrogen cylinders of an ANSUL fire suppression system indicates a pressure of 1600 psi
(110.3 bar) on the pressure gauge. The temperature of the cylinder is 80 °F (27 °C). Reference to the chart shows
that this is below the minimum recommended pressure for this temperature. The cylinder should be replaced by
a fully charged nitrogen cylinder.
Note:
The converted values in this document are provided for dimensional reference only and do not reflect an actual measurement.
ANSUL and the product names listed in this material are marks and/or registered trademarks. Unauthorized use is strictly prohibited.
CYLINDER
PRESSURE
(bar)
psi
(144.8) 2100
(137.9) 2000
(131.0) 1900
(124.1) 1800
(117.2) 1700
(110.3) 1600
(103.4) 1500
(96.5) 1400
(89.6) 1300
–65 –40 –20 0 20 40 60 80 100 120 150
°F
(–54)
(–40)
(–29)
(–18)
(–7)
(4)
(16)
(27)
(38)
(49)
(66) (°C)
NITROGEN CYLINDER TEMPERATURE
TEMPERATURE CORRECTION LINE
RECOMMENDED
OPERATING
PRESSURE
Summary of Contents for ANSUL PS-1000
Page 1: ...ANSUL FIRE SUPPRESSION SYSTEM OPERATION AND MAINTENANCE MANUAL Part No 78661 03...
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Page 41: ...INSTALLATION ANSUL OPERATION AND AUTOMAN II C MAINTENANCE RELEASING MANUAL DEVICE ANSUL 001799...
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