Rupture Disks Combined with Safety Relief Valves
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Rupture Disks Combined with Safety Relief Valves Visit www.bsbsystems.com or www.bsb.ie for the most complete, up-to-date information

Instructions The ASME Pressure Vessel Code permits the use of a rupture disk device at both a safety relief valve inlet and outlet. This combination, once considered a luxury, has proven itself to save money through: • Zero process leakage to the atmosphere • Longer periods between major overhauls • Valves can be tested in place • Less expensive trim material can be used •Valve life is extended by isolating internal valve parts from corrosive units This bulletin has been published to give you the facts, the advantages, applications and applicable portions of the ASME Code which governs this...

Safety Relief Valve Isolation BS&B recommends the Sta-Saf® lineup of reverse buckling rupture disk devices when isolating safety relief valves. Sta-Saf products cover most ranges of safety relief valve pressures ranging from 5 psig (0.34 barg) to over 3000 psig (208 barg). Safety Relief Valve Sta-Saf disks offer the user a vacuum resistant, solid metal rupture disk designed for non-fragmentation and ultimate leak-tightness. Each Sta-Saf Rupture disk is available in a pre-torqued SRB-7RS Safety Head that allows the rupture disk to be removed from service, then inspected, cleaned and...

Figure 3b Type AV Disk fits between standard flanges 2. RETROFIT - INLET TO VALVE For isolating safety relief valves already in service with rigid discharge piping, the SVI rupture disk assembly is recommended (figure 3a). The SVI is a reverse buckling rupture disk welded into a one piece metal assembly. Supplied with affixed gasket for immediate assembly. The SVI easily slips into the inlet piping. Advantages include: • No safety head required Figure 3a SVI Disk installs • Fits into inlet piping easily into inlet • Non-fragmentation piping • Available in sizes 1.5” (40mm) and larger Facts...

ASME PRESSURE VESSEL CODE, SECTION VIII, DIVISION 1, 2010 EDITION Rupture Disks and Safety Relief Valves Defined UG-126 UG-127 P R E S S U R E R E L I E F NONRECLOSING PRESSURE RELIEF DEVICES VALVES45 (Meeting the Requirements of ASME CODE, 2010 Section VIII Division 1) (a) Safety, safety relief, and relief valves shall be of the direct spring loaded type. (b) Pilot operated pressure relief valves may be used, provided that the pilot is self-actuated and the main valve will open automatically at not over the set pressure and will discharge its full rated capacity if some essential part of...

MEETING ASME CODE Capacity of Combination In order to meet the ASME code, the Safety Relief Valve capacity of the combination of the safety relief valve and rupture disk must be determined one of two ways: A) Flow test the combination to arrive at a “certified combination capacity factor”. Testing must be done in accordance with Paragraph UG-132 and approved by the National Board of Boiler and Pressure Vessel Inspectors. Excess Flow Valve Rupture Disk Rupture disk/relief valve combiSafety Head nations with flow tests will be Flange allowed a relieving capacity of the valve multiplied by a...

The Application of Rupture Disk Installed Between Pressure Relief Valves UG-127 (b) A rupture disk device may be installed between a pressure relief valve52 and the vessel provided: (1) The combination of the pressure relief valve and the rupture disk device is ample in capacity to meet the requirements of UG133(a) and (b); (2) the marked capacity of a pressure relief valve (nozzle type) when installed with a rupture disk device between the inlet of the valve and the vessel shall be multiplied by a factor of 0.90 of the rated relieving capacity of the valve alone, or alternatively, the...

BSBSystems.com Visit our website for the most complete, up-to-date information Limerick, Ireland T +353 61 484700 F +353 61 227987 E sales@bsb.ie United Arab Emirates T +971 2406 9603 F +971 2406 9810 E sales@bsbsystems.ae Products, specifications and all data in this literature are subject to change without notice. Questions regarding product selection and specifications for specific applications should be directed to BS&B Safety Systems, L.L.C. or BS&B Safety Systems Ltd. All sales are subject to BS&B Safety Systems, L.L.C. or BS&B Safety Systems Ltd. standard terms and conditions of...