Standard material of construction is 316 stainless steel
Safety head assemblies and rupture discs are available in two styles:
The 1/4A style features a 1/4" blow-out diameter, an angular seat and can be ordered in pressures from 900 to 60,000 PSI (62 to 4140 bar)
The 1/2F style features a 1/2" blow-out diameter, a flat seat and can be ordered in pressures from 500 to 10,000 PSI (34 to 689 bar). This style also has a reversible hold-down ring which greatly reduces the possibility of premature disc failure associated with installation errors inherent in some designs.
Rupture Discs are not included in the safety head assembly. To order discs separately, use the following part numbering system:
Style
4 = 1/4" Angled
8 = 1/2" Flat
Material
AL = Aluminum
IN = Inconel
MO = Monel
NI = Nickel
SI = Silver
SS = 316SS
TI = Titanium
Pressure
List desired pressure at 72°F (21°C) in KSI.
Examples:
An Inconel disc rated for 18,000 PSI in 1/4" Angled style would be ordered as 4IN18.00
An Aluminum disc rated for 750 PSI in 1/2" Flat style would be ordered as 8AL0.750
