Parr Instrument - page 367

110 P a r r I n s t r u m e n t C o m p a n y
w w w . p a r r i n s t . c o m
Safety Rupture Discs
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
C276. Discs can be produced to match any oper-
ating pressure and temperature above the stated
minimums.
Parr reactors and pressure vessels from
25 mL to 2000 mL use the 526HC alloy 600 disc
or 581HC alloy 600 with gold facing. The 1 gallon
and larger use the 708HC series discs. The 4580
reactor systems use the 1415HC series discs.
For a complete listing of part numbers, burst
ranges and materials see Manual 231M.
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.
Users are invited to contact the Parr Technical
Support Staff with requirements for special
rupture discs.
1/4" NPT (M)
Rupture Disc
Orifice Ring
Nose Cone
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
Rupture Discs for 1/2" Orifice
Burst Rating, psig Inconel Disc
1000 708HCP10CT
1500 708HCP16CT
2000 708HCP20CT
3000 708HCP30CT
3000 1415HCP30CT
4500 1415HCP45CT
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.
The 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 ves-
sel. For pressure loads that do not cycle rapidly
such as our vessels, Fike suggests limiting the
actual operating pressure to no more than 90%
of its burst pressure. This combination will limit
operating pressures to no more than 90% of the
design pressure of the vessel.
A888HC2 Rupture
Disc Assembly