Post-Discharge Maintenance
06-236115-001 6-7 October 2014
6-2.8 Safety Disc Replacement (3-inch and 2-inch Manufactured after April
2014)
Note: This process only applies to 3-inch valves and 2-inch valves manufactured after April
2014. For 2-inch valves manufactured during or before April 2014, see Section 6-2.7.
The safety disc for the new 2-inch valve and the 3-inch valve is located on the cylinder head,
not on the cylinder valve.
1. Remove and discard the safety burst disc assembly (see Figure 6-6 and Figure 6-7).
2. Apply lubricant to the packing o-ring of the new safety burst disc assembly.
3. Install the new safety disc assembly to the cylinder. Torque to the appropriate value listed
in Table 6-5.
Figure 6-6. 2” Valve/Cylinder Safety Burst Disc Assembly
Figure 6-7. 3” Valve/Cylinder Safety Burst Disc Assembly
CAUTION
Whenever the valve is rebuilt, the Safety Disc Assembly must be replaced.
WARNING
Before removing the Safety Burst Disc Assembly, make sure that all pressure
has been relieved from the cylinder. To relieve any remaining pressure, restrain
the cylinder and depress the pressure check in the Supervisory Pressure Switch.
WARNING
Never install any other type of safety burst disc assembly than specified in
Table 6-5 for the corresponding cylinder. Installing the incorrect assembly
could result in a violent rupture of the cylinder and cause death, serious injury
and/or property damage. The Safety Disc Retainer on the 2-inch valve is
smaller than the Safety Disc Retainer on the 3-inch valve.
Table 6-5. Safety Disc Replacement Table (3-inch Valve and New 2-inch Valve)
Safety Disc Assembly
P/N
Torque PSIG @ 70°F Cylinder Size
90-150100-000 90 ft lb 800-975 200 and 350 lb.
90-170100-000 90 ft lb 800-975 600 and 900 lb.
Packing O-ring
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