6-4.3 Nitrogen Cylinder Recharge - Kidde Fire Systems ECS Manual

Post-Discharge Maintenance
6-4.3 Nitrogen Cylinder Recharge
Nitrogen cylinders must be recharged when the cylinder pressure gauge indicates pressure is
below normal (1800 PSIG at 70°F [124 bar gauge at 21°C] or as adjusted for temperature) or
immediately after discharge. Nitrogen used for charging must comply with Federal
Specification BB-N-411C, Grade A, Type 1. Copies of this specification may be obtained from:
http://www.global.ths.com/.
Before recharging, the cylinder must be firmly secured by chains, clamps or
other devices to an immovable object such as a wall, structural I-beam or
WARNING
permanently mounted holding rack.
Recharge the nitrogen cylinders as follows:
1. Remove the protection cap from the cylinder valve actuation port.
2. Install the cylinder seating adapter (P/N WK-933537-000) to the cylinder valve actuation
port.
3. Connect the nitrogen recharging supply hose to the adapter. Tighten securely.
4. Open the nitrogen recharging control valve slowly until full nitrogen flow is obtained.
5. Monitor the recharging supply pressure gauge. Close the charging control valve when the
gauge indicates the proper cylinder pressure (1800 PSIG at 70°F [124 bar gauge at 21°C]).
6. Allow the cylinder to cool to ambient temperature and recheck the nitrogen cylinder pres-
sure.
7. Open the valve and add additional nitrogen as necessary to obtain a full cylinder charge at
ambient temperature (1800 PSIG at 70°F [124 bar gauge at 21°C]).
8. Close the valve and remove the supply hose and charging adapter from the nitrogen cylin-
der.
9. Using a soap solution, thoroughly check the nitrogen cylinder valve for leakage. Bubbles in
the soap solution indicate leakage and shall be cause for rejection of the cylinder.
10. At the completion of the leak test, thoroughly clean and dry the cylinder valve.
11. Ensure the cylinder valve control head port is clean and dry.
12. Immediately install the protective cap to the actuation port of the cylinder valve.
13. Install the charged cylinder as described below.
October 2014
N PRESSURE - TEMPERATURE CHART
2
2100
2000
1900
1800
1700
1600
1500
1400
1300
1200
-40° -20° 0° -20°
Figure 6-9. Nitrogen Temperature vs. Pressure Data
RECHARGE
40° 60° 80° 100° 120°
TEMPERATURE °F
6-16
140°
06-236115-001