Safety Rupture Discs

A888HC2 Rupture Disc Assembly
A888HC2 Rupture Disc Assembly

Parr Pressure Vessels are protected by custom built rupture discs furnished by Fike® Corporation, a specialist in this exotic art. Examination of these discs will indicate that each of these discs is domed. This dome was produced at the factory by taking the individual disc to 70% of its burst pressure.

ASME as well as other pressure vessel codes dictate that pressure vessels must be equipped with a rupture disc designed to burst no higher than the design pressure of the vessel. For pressure loads that do not cycle rapidly such as in our vessels, Fike suggests limiting the actual operating pressure to no more than 90% of the disc burst pressure. This combination will limit operating pressures to no more than 90% of the design pressure of the vessel.

We have selected Alloy 600 as the standard material for these rupture discs. It provides excellent corrosion resistance while retaining over 90% of its room temperature rating at temperatures up to 450 °C. For added corrosion resistance we can furnish these discs with gold facing or replace them with discs made of Alloy C-276. Discs can be produced to match any operating pressure and temperature above the stated minimums.

Parr reactors and pressure vessels from 25 mL to 2000 mL use the 526HC series alloy 600 disc or 581HC series alloy 600 with gold facing. The 1 gallon and larger use the 708HC series discs. The 4580 reactor systems use the 1415HC series discs.

In general, the 1000 psi disc in the 526HC/581HC series discs and the 800 psi in the 708HC are the lowest available ranges in the alloy 600 material. Alternate disc materials are available but they do not offer the same corrosion resistant properties and temperature capabilities.

For applications where users prefer a lower range pressure gage, we would add a spring loaded relief valve set to protect the gage and a 1000 psi rupture disc as the fail safe protection.

Safety Rupture Discs

Most rupture discs furnished by Parr come with CE certification.  Upon request, Parr can furnish 1/2″ discs with flat seat (both holder and rupture disc) with ASME certification markings and documentation (with UD certification designator).

Users are invited to contact the Parr Technical Support Staff with requirements for special rupture discs.

Typical Rupture Discs for 1/4″ Orifice
Burst Rating, psig Inconel Disc Gold-Faced Inconel Disc
1000 526HCPD 581HCPD
2000 526HCPF 581HCPF
3000 526HCPG 581HCPG
4000 526HCP40CT 581HCP40CT
5000 526HCPH 581HCPH
8000 526HCPJ 581HCPJ
10000 526HCP100CT


Typical Rupture Discs for 1/2″ Orifice
Burst Rating, psig Inconel Disc
1000 708HCP10CT
1500 708HCP16CT
2000 708HCP20CT
3000 708HCP30CT
3000 1415HCP30CT
4500 1415HCP45CT

For a complete list of rupture disc part numbers, burst ranges, materials and temperature ratings, see manual  231M: Safety Rupture Disc Assemblies Operating Instructions .

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