These rupture discs are compression or reverse discs with micro-scored calibrated sections opening in petals, characterised by the presence of 4, 6 or more radial scoring. This allows for better opening reducing the risk of petal detachment. This makes the FSSCRRA rupture discs suitable both at high and at low bursting pressure and can be used only with gas and liquids (with the presence of a special gas cushion) also in cycling and pulsating conditions without reduction of safety margins. FSSCRRA rupture discs react to excessive pressure in a few milliseconds without fragmentation. They are especially suited for protection of safety valves. These rupture discs allow for a ratio between operating and bursting pressure up to 95% and have a very good resistance to corrosion. Corrosion resistance may be additionally improved with a PTFE lining. In addition, FSSCRRA discs can be subject to absolute vacuum conditions without need for supports.
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