The rupture disc was not invented in Europe and that feels some in the American cruel terms which are: 

- the "mfg ranges" (the tolerance of manufacture: 0;  5;  10%)
- the "Burst tolerances" (tolerances of rupture, -3/+6% for example)
- Ratio of service (Service rate)
- 70% of stamped burst pressure (70% of burst pressure rated)
- etc...

To be continued, visit us regularly

Links lead to www.iso.corg

ISO 4126-1:2004	Safety devices for protection against excessive pressure Part 1: Safety valves
ISO 4126-2:2003	Safety devices for protection against excessive pressure Part 2: Bursting disc safety devices
ISO 4126-4:2004	Safety devices for protection against excessive pressure Part 4: Pilot-operated safety valves
ISO 4126-5:2004	Safety devices for protection against excessive pressure Part 5: Controlled safety pressure relief systems (CSPRS)
ISO 4126-6:2003	Safety devices for protection against excessive pressure Part 6: Application, selection and installation of bursting disc safety devices
ISO 4126-7:2004	Safety devices for protection against excessive pressure Part 7: Common data
ISO 6718:1991	Bursting discs and bursting disc devices
ISO 6718:1991/Cor 1:1993