CERTIFLOW ®
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CERTIFLOW ® Look for the stamp ASME Compliant Rupture Discs The ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, specifies that rupture disc devices, like all other pressure relief products, should be tested and certified as to their flow characteristics, and that these certified values should be used in flow and sizing calculations. Rupture disc products manufactured in accordance with all applicable rules of ASME Code Symbol Stamp (shown at left) on the Code Section VIII, Division 1 must carry the tag, as well as the certified flow resistance (KR) and minimum net flow area (MNFA) values. The "NB" stamp acknowledges The National Board of Boiler and Pressure Vessel Inspectors as the organization that certified the flow tests. Continental Disc Corporation is accredited and authorized by the Code Symbol Stamp for product built in acASME to utilize the cordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1. The complete line of CERTIFLOW® rupture discs meets all ASME Code requirements, including KR and MNFA values. With the extensive line of CERTIFLOW rupture discs, there is one available to meet most applications and operating conditions. Certified KR values represent tested flow resistance values. Relief systems can be designed or evaluated more precisely and safely if certified flow resistance values are used, rather than industry practiced estimates. These estimates may not accurately reflect the flow resistance of the rupture disc. Using the certified flow resistance value, along with proper engineering practices, allows precise, efficient, and safe design of relief systems. “K” values are pressure loss expressed as the number of velocity heads and they are available for nearly all piping system devices and components, including rupture discs. Rupture disc devices should be included in the flow equation in the same manner as all other system components to determine the relieving capacity of the entire relief system. Design engineers are provided with certified KR values: • which enable the designer to meet ASME Code Section VIII, Division 1 for relief system design • which may permit a reduction in pipe size and associated piping costs when utilized during a relief system design • for use when evaluating relief systems where two-phase flow may occur • for use when re-evaluating existing relief systems to comply with design documentation requirements of OSHA CFR 1910.119," Process Safety Management of Highly Hazardous Chemicals." Two Ways to Use a Certified Flow Resistance Factor To confirm relief capacity requirements in a sole relief device system To confirm a rupture disc/PRV combination follows the “3% Rule” Combining the certified flow resistance (KR) with the K values of other piping components (shown in example A) allows Example A the design engineer to accurately calculate and evaluate a relief system’s flow capacity. Even for simple relieving systems that can be evaluated with the coefficient of discharge method Example B (8 & 5 rule), utilizing the certified flow resistance (KR) along with the associated K values for the other piping components (shown in example B) will allow for the flow capacity to be more accurately evaluated. The system shown might be designed new, or it might be reevaluated to comply with OSHA CFR 1910.119, which requires that systems be designed with “recognized and generally accepted engineering practices.” In the past, an estimated value for the flow resistance of the rupture disc would be used for calculations. Combining the certified flow resistance value (KR) with the K values of the other piping components, a design engineer can now accurately evaluate this system’s nonrecoverable pressure loss. To specify a rupture disc device to comply with the ASME Code: 1) Select the most appropriate rupture disc model for your application. Use the Rupture Disc Selection Guide (Bulletin #1-1100) or contact your local representative for assistance 2) Find the type, holder, media, required options, and estimated size in Table I or II 3) Find the corresponding MNFA in Table III 4) Use the KR and MNFA values to confirm the flow characteristics of your relieving system. For assistance with flow of fluids calculation, consult Crane Technical Paper No. 410. There is also a variety of software titles that will automate your flow of fluid calculations. Be certain that your evaluation uses proper engineering practices such as including all piping system components into your flow calculations and multiplying the calculated relieving capacity by a factor of 0.90 or less as specified in ASME Code Section VIII, Division 1. A copy of Continental Disc Corporation's Certificate of Authorization to use the Code Symbol Stamp can be found on our website at www.contdisc.com. There you will also find the most current CERTIFLOW data.

CERTIFIED VALUES Table I — Continental Disc Corporation Certified Rupture Disc Products Rupture Disc Type Seat Code Size Range Rupture Disc Holder Type Media Options Gas Liquid Liners, Coatings Liners, Coatings in mm 1-8 1-8 25-200 25-200 Min. Net Flow Area Table KR Value National Board Certification Number A A 0.29 0.38 75585 75596 REVERSE ACTING RUPTURE DISCS FOR INSERT TYPE HOLDERS HPX® HPX FS FS HPX HPX ULTRX® & ULTRX HP FS ULTRX Gas None 1-12 25-300 A 0.36 75248 ULTRX & ULTRX HP FS ULTRX Gas, Liquid Liners, Coatings 1-12 25-300 A 0.62 75125 ULTRX DD ULTRX (DD)* Gas, Liquid Liners,...

ASME Code Symbol Stamp Available When Specified China Manufacture License Available When Specified Pressure Equipment Directive Available When Specified HEADQUARTERS // GROTH CORPORATION // 3160 W. Heartland Drive Liberty, MO 64068 USA Ph (816) 792 1500 | Fax (816) 792 2277 sales@contdisc.com 13650 N. Promenade Blvd. Stafford, TX 77477 USA Ph (281) 295-6800 | Fax (281) 295-6999 sales@grothcorp.com THE NETHERLANDS CHINA INDIA Energieweg 20 2382 NJ Zoeterwoude-Rijndijk The Netherlands Ph +(31) 71 5412221 | Fax +(31) 71 5414361 cdcnl@contdisc.com Room 910, Tower B, COFCO Plaza No. 8...