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Combining Rupture Discs and Safety Relief Valves


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Isolating a relief or safety valve from the process media through the installation of a rupture disc upstream of the valve inlet will eliminate exposure of the costly valve to effects of the media.

Published in: Engineering
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Combining Rupture Discs and Safety Relief Valves

  2. 2. Pressure relief valves combined with rupture discs Often thought of as substitute products, rupture discs and pressure relief valves (PRVs) are used together to ensure protection and long-term savings. The combined use of rupture discs and pressure relief valves has become common practice, especially in refineries, chemical and petrochemical plants. Advantages: When in use, rupture discs provide a superior process seal reducing fugitive emissions Valves reclose after an overpressure event, saving process media and allowing operation to continue until the rupture disc can be replaced Allows for less expensive valve material Extends the valve’s life and requires less maintenance Reduces overall cost and lead time Isolation from Leakage Pressure relief valves can be significant sources of media leakage and emissions. Due to continually tightening government emission standards, small leaks can be more than troublesome…theycanbeexpensive.ByisolatingtheinletofaPRV,apositivesealisestablished to minimize leakage and reduce fugitive emissions that can escape up through the valve seat. PRESSURE RELIEF VALVE RUPTURE DISC PRESSURE RELIEF VALVE + RUPTURE DISC Leak Tight No - leaks, which may result in product loss Yes Yes Cost High Low Medium Maintenance High - must be shut down to be checked periodically Low Medium Adjustable Yes No - fixed setting Yes Reclosable Yes No Yes Reusable Yes No - must be replaced after each use Valve is reusable, disc is not PRESSURE RELIEF VALVE ADVANTAGE RUPTURE DISCS+ A COMPARISON OF OPTIONS P E R F O R M A N C E U N D E R P R E S S U R E ®
  3. 3. Isolation from Corrosion Depending upon the corrosive nature of an application’s process media, maintaining equipment for long-term service can be expensive due to the costs of exotic materials for valve components or frequent changeouts caused by equipment deterioration. Isolating a valve with a rupture disc minimizes corrosive effects by preventing continual contact between the valve’s wetted parts and the system media. Continental Disc Corporation Rupture Discs The following are some of the Continental Disc Corporation rupture discs that could be used in conjunction with a pressure relief valve: HPX® Rupture Discs LOTRX® Rupture Discs MICRO X® Rupture Discs RCS Rupture Discs Technical Considerations: Severalcodesandstandardsrequiretheuseofatell-taledevicetoindicateorventpressure betweentherupturediscandPRVensuringproperfunctionofthecombineddevices.Agauge tap can be requested in the outlet of the rupture disc holder to allow for connection of a tell-tale device. The size of the rupture disc device is generally the same as the PRV inlet connection. TheflowcapacityoftherupturediscincombinationwiththePRVisgenerallydeterminedby correctingthevalvecapacitytoaccountfortherupturediscdevice.Forcertifiedrupturedisc/ pressure relief valve combination capacity factors, see our ASME Combination Capacity Factors literature. For rupture disc certified flow resistance values (KR ) to be used in evaluating flowing fluid pressure drop from the vessel to the valve inlet (normally specified not to exceed 3% of the valve set pressure), see our CERTIFLOW® literature. 1” – 8” HPX® and LOTRX® reverse acting rupture discs assembled in HPX® and LOTRX® holders are designed to enable installation of the safety relief valve directly coupled with the rupture disc holder. This is because the height of the holder outlet keeps the disc petal out of the throat of the valve without the need of a spool piece, which helps to provide very efficient flow characteristics for the assembly. See the HPX® Rupture Disc Product Family and Reverse Acting literature for more details. NOTE: The HPX Rupture Disc holder does require a spool piece between the holder outlet and the inlet of a pressure relief valve for 10” and 12” (250 mm and 300mm) sizes. For more details, see HPX Installation Instructions on Pressure Relief Valve Retrieval Rope ENVIRO-GUARD® 3-D Tag Universal B.D.I. ® (Burst Disc Indicator) Tell-Tale Assembly Rupture Disc Device Alarm System P E R F O R M A N C E U N D E R P R E S S U R E ® SANITRX HPX® Rupture Discs for sanitary applications CDC Rupture Discs with non-metallic seals CDCV Rupture Discs with non-metallic seals
  4. 4. P E R F O R M A N C E U N D E R P R E S S U R E ® Continental Disc Corporation reserves the right to alter the information in this publication without notice. // © 2014 Continental Disc Corporation Reproduction without written permission is prohibited. PRINTED IN U.S.A. LIT1338 // 0114 HEADQUARTERS // 3160 W. Heartland Drive Liberty, MO 64068 USA Ph (816) 792 1500 | Fax (816) 792 2277 THE NETHERLANDS Energieweg 20 2382 NJ Zoeterwoude-Rijndijk The Netherlands Ph +(31) 71 5412221 | Fax +(31) 71 5414361 CHINA Room 1312, Tower B, COFCO Plaza No. 8 JianGuoMenNei Avenue Beijing (10005), P.R. China Ph +(86) 10 6522 4885 | Fax +(86) 10 6522 2885 INDIA 423/P/11, Mahagujarat Industrial Estate, Moraiya, Sarkhej-Bavla Road, Ahmedabad (GJ) 382213 INDIA Ph +(91) 2717 619 333 | Fax +(91) 2717 619 345