Rupture Discs -Reverse Acting

Rupture Discs - 250,000 cycles at 95% operating ratio                                                       

Cycle tests performed at CDC Engineering Labratory and further information available on request.

Unique Lot Qualification Testing                                                      

The ASME code mandates that two rupture discs per lot are the minimum requirements to make a batch of discs which some manufacturers adhere to. CDC however go above and beyond the ASME code with their unique lot qualification testing.

For example the "simulated In-plant use test" is the only way to offer a guarantee to the client that the disc will work for their application.

ULTRX^® Scored Reverse Acting Continental Rupture Disc Lot Qualification and In-house Testing Procedures

ULTRX rupture discs are manufactured and tested under a Quality Assurance Program certified to ISO 9001 Quality System requirements. Before any lot of ULTRX rupture discs are shipped from Continental Disc Corporation, specific criteria must be met. Following is a listing of qualification procedures and tests required for each lot.

Any rupture disc which fails any test or inspection at any stage during manufacture, causes total lot rejection. The lot of rupture discs is scrapped, remanufactured and each step or test listed below is repeated. There are NO MARGINAL RUPTURE DISCS, NO SECONDS, and in TOTAL QUALITY, no room for error.

1) Liquid Penetrant Test - A liquid penetrant test is conducted on each rupture disc to verify the score integrity.

2) Destructive Burst Test - To verify non-fragmentation, an air volume burst test, to destruction, is conducted on one rupture disc from the manufactured lot.

3) Destructive Burst Test - One rupture disc from the lot is intentionally damaged. This rupture disc is then burst under air pressure to verify the damage safety ratio.

4) Destructive Burst Test - Two rupture discs from the lot are intentionally damaged. Under hydraulic pressure, both rupture discs are burst tested to verify the damage safety ratio in liquid service.

5) Destructive Burst Test - A minimum of two rupture discs are burst tested at ambient temperature as required by ASME Code Section VIII and Continental Disc Corporation's internal testing standard.

6) Destructive Burst Test - Two rupture discs are burst tested at elevated temperature as required by ASME Code Section VIII.

7) Simulated In-Plant Use Test - One rupture disc is pressurised with 30 psig pressure on the concave side. This rupture disc is cycled from 0 to 90% of the ambient rating (plus 30 psig) against the convex side for a minimum of 1000 cycles, followed by a liquid penetrant test of the rupture disc score line. This is to simulate in-plant use and verify score line integrity.

8) Proof Pressure Test - All remaining rupture discs in the lot, comprising the shipment quantity, are proof pressure tested to 90% of the ambient temperature rating to verify each rupture disc's ability to withstand the maximum operating pressure recommended by Continental disc Corporation.

9) Final Production Stage:

a) Cleaning the finished rupture discs.
b) Tagging per customer requirements on Continental Disc's exclusive three-dimensional tag. Tagging includes K_R, MNFA, and UD Code Symbol Stamp when ASME Section VIII is specified.
c) Completion of a burst test certificate for enclosure with shipment.

Final inspection by Quality Assurance is independent of production. It is performed 100% and includes verification of all test results for conformance, rupture disc physical appearance, documentation review and packaging inspection.

ULTRX holders have been similarly design tested and are 100% inspected for dimensional characteristics and appearance by Quality Assurance inspectors. Continental Disc Corporation provides permanently affixed Stainless Steel Customer Identification Tag when equipment tag numbers are furnished on the order.

HPX Scoring                                                       

Precision scoring in the vent side of the dome improves cyclic life as the score is in compression rather than shear. This is also much better for Biotech applications as its a more aseptic design as the score is not in contact with the process. This is a result of years of R & D work at CDC who drive the rupture disc market in terms of new technology & development.

Guaranteed Reliability                                                       

 • Advanced product design

 • Precise manufacturing technology

 • Extensive testing performed during the manufacturing process and lot qualification

 • Pre-shipment inspection

 • Unique packaging designed to protect your rupture discs in shipment, storage and handling at your plant site

 • Ability to operate in pressure-to-vacuum cycling applications

High Versatility                                                       

Built on years of research and development, the HPX and SANITRX^® HPX rupture discs are high precision pressure relieving devices that protect personnel, equipment and the environment. The versatility of the HPX product family offers pressure protection for a wide range of applications in many processing industries, including: chemical, oil and gas, food, beverage, pharmaceutical, biotech, pulp and paper, power and more.

Whether you need a rupture disc to meet the most demanding application requirements or a rupture disc to economically meet the needs of a less demanding one, the HPX and SANITRX HPX rupture disc is the solution for you.

HPX and SANITRX HPX rupture discs are available in various sizes, materials, ratings, manufacturing ranges, and operating ratios to meet the performance criteria demanded by your application requirements.

Suitable for multi batch processing                                                       

Due to its high performance operating capabilities, range of burst ratings and materials of construction, the HPX rupture disc is the ideal product to use in plants where production includes batch processing runs where operating conditions and media may change frequently. The variability offered by HPX rupture discs makes future modifications to specifications easier to
incorporate in change control procedures and without piping modifications.

Guaranteed Performance                                                       

The HPX rupture disc is a semicircular scored reverse acting rupture disc that is ideal for liquid or gas/vapor applications.

Each lot of discs is built to order per the specifications of each overpressure relief requirement in your plant. Each lot is then performance tested to provide reliable performance in your plant during normal operations and in overpressure conditions. Each HPX rupture disc is proof pressure-tested prior to shipment.

Optimum material thickness and manufacturing tooling design provide not only the full opening and accurate burst rating you expect but also longer service life at higher operating-to-burst ratios demanded by today’s process industries.

Gas & Liquid Operation                                                       

Ideal for liquid or gas/vapor applications

To optimize service life and rupture disc performance, Continental Disc Corporation manufactures and tests each HPX rupture disc order for compressible or incompressible relief conditions as required by your application. HPX rupture discs manufactured and tested only for compressible (gas/vapor) relief conditions may not function properly in an incompressible (liquid) application. Please state in your specifications and orders if a scenario exists for relief of incompressible media or if relief conditions exist only for compressible media.

Burst Pressures - The following table shows burst pressures available at 72°F (22°C)

Maximum Recommended Temperature Limits

Excellent Corrosion Resistance                                                       

 • Available with a TEFLON liner for corrosion protection on the process side of the rupture disc.
 

 • TEFLON Outlet Protective Cover available for corrosion protection on the vent side of the rupture disc and holder.
 

 • TEFLON coating is available for corrosion protection on the process and/or vent side of the rupture disc.

CORROSION RESISTANCE can be enhanced by TEFLON^® coating or TANTALINE^® treatment of the holder inlet and/or outlet.

 • The TANTALINE process creates a pinhole-free, corrosion-resistant barrier of pure tantalum metal. The Tantalum metal is grown into the substrate metal (typically, 316 stainless steel) and alloy bonded. As a result, typical modes of failure of traditional tantalum coatings that are sprayed or dipped, such as delamination, chipping and spalling, are virtually non-existent.

Specifications                                                       

Features

DISC SIZES - HPX: 1” through 8” sizes; SANITRX HPX: 1” through 3” sizes

DISC MATERIALS - 316 and 316L Stainless Steel, Nickel, MONEL^®, INCONEL^®, HASTELLOY^® C

BURST PRESSURES - 10 psig to 1000 psig (0,689 barg to 68,9 barg)

MANUFACTURING RANGE - Zero, -5% and -10%

OPERATING RATIO - Choice of 90% or 95%

SAFETY RATIO - 1 to 1 or less. If the rupture disc becomes damaged, it will relieve at or below the burst pressure

DURABILITY - Design tested for 250,000 cycles1 from full vacuum to 95% of burst rating

DESIGN - Non-fragmenting, reverse acting, bubble-tight seal

Holders

The HPX Insert holder is designed to optimize flow, assure proper orientation of the HPX rupture disc in your piping system, provide a tight seal, prevent fragmentation of the rupture disc and enable direct mounting of a safety relief valve on the holder outlet.

Features:

 • Flow optimization of the HPX holder and rupture disc assembly is characterized by best-in-class certified KR factors of 0.29 for gas/vapor relief or 0.38 for liquid relief.

 • Proper orientation of the disc in the holder is assured by the three alignment pins in the holder inlet that properly align and orient the rupture disc in the holder. An optional J-Hook can be used to orient the holder in its mating flanges. The flow arrows on the holder and rupture disc tags confirm proper flow direction.

 • A durable tapered sealing surface on the holder inlet that, along with proper installation and handling, provides a bubble-tight (no air bubbles detected with leak detection fluid) metal-to-metal seal between the holder inlet and rupture disc. Contact your sales representative for specific leak rate or leak testing requirements.

 • The holder outlet bore incorporates an arcuate that provides a radiused hinge for the disc petal to form around preventing fragmentation of the disc.

 • HPX holder outlets are designed to eliminate the need for a spool piece between the holder outlet and nozzle of a safety relief valve.

 • The holder inlet protects the rupture disc dome during installation of the assembly into the piping system.

 • As a standard, the holder will come with spiral groove facing per ASME BI6.5, which will provide a surface finish between 125 and 250 microinches (3,2 to 6,3 HPX INSERT micrometers).

Burst Pressures & Tempature Limits & Pressure Rating, Tolerance & Max Operating Pressures

Burst Disc Indicator                                                       

Universal or Integral B.D.I.^® (Burst Disc Indicator) Alarm System

The B.D.I. (Burst Disc Indicator) Alarm System is designed for use with Continental rupture discs. The B.D.I. Alarm System signals the system operator when a rupture disc has burst to relieve an overpressure or vacuum condition.

The heart of the system is the B.D.I. Alarm Strip. Upon disc rupture, the B.D.I. Alarm Strip is severed, disrupting the flow of electric current through the strip. The change in the electric circuit status can be monitored in a control room, or with a Continental Disc B.D.I. Monitor. The B.D.I. Monitor can warn with a visual and/or audible alarm and can also activate appropriate equipment.

The B.D.I. Alarm System should be specified:

 • When warning of pressure relief is essential for plant safety

 • When immediate notice is needed of relief of an overpressure or vacuum condition to indicate process malfunction

 • When indication is vital that a rupture disc has burst and toxic substances are venting

 • When emergency equipment must be triggered immediately upon disc rupture to alter or stop a process

 • When loss or contamination of product will occur if a rupture disc is not replaced immediately

 • When monitoring of rupture discs is important in hard-to-reach locations