CERTIFLOW®
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CERTIFLOW ASME COM PLIA NT RU PT URE DISCS Continental Disc & LaMOT Brand 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 Section VIII, Division 1 must carry the Code Symbol Stamp on 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 ASME to utilize the Code Symbol Stamp for product built in accordance 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”

COMMON USES // 2 Ways to Use a Certified Flow Resistance Factor To confirm relief capacity requirements in a sole relief device system Combining the certified flow resistance (KR) with the K values of other piping components (shown in Example A) allows the design engineer to accurately calculate and evaluate a relief system’s flow capacity. Example A Even for simple relieving systems that can be evaluated with the coefficient of discharge method (8 & 5 rule), utilizing the certified flow resistance (KR) along with the associated K values for the other piping components (shown in Example B)...

TABLE 2 // Continental Disc Corporation Certified Rupture Disc Products RUPTURE DISC TYPE SEAT CODE RUPTURE DISC HOLDER TYPE MIN. NET FLOW AREA TABLE NATIONAL BOARD CERTIFICATION NUMBER Liners, Coatings Liners, Coatings Liners, Coatings Coatings Coatings None Liners Liners SIZE RANGE REVERSE ACTING RUPTURE DISCS FOR INSERT TYPE HOLDERS HPX®, HPX®-Ta HPX®, HPX®-Ta HPX®, HPX®-Ta LOTRX® LOTRX® RCS RCS RCS HPX, HPX-RH, HPX-PT, HPX-PT-RH HPX, HPX-RH, HPX-PT, HPX-PT-RH Gas Liquid Gas, Liquid Gas Liquid Gas Gas Gas REVERSE ACTING RUPTURE DISCS FOR SANITARY SERVICE SANITRX HPX® Standard Sanitary...

// Minimum Net Flow Areas (MNFA) for Certified Rupture Disc Products Disc Size Disc Size Disc Size China Manufacture License Available When Specified ASME Code Symbol Stamp Available When Specified Disc Size Pressure Equipment Directive Available When Specified Disc Size Disc Size Disc Size Disc Size Disc Size Disc Size Inlet* Connection Inlet* Connection Minimum Net Flow Area for each rupture disc size. Black numbers indicate inches squared (in2), blue numbers indicate millimeters squared (mm2). *Applies to MPT, BSPT and BSPP connections. A copy of Continental Disc Corporation’s...