GLP-S? Reverse Buckling Disk
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Low Pressure Sanitary Reverse Buckling Rupture Disk Introduction Burst Pressure Capability The GLP-S offers the lowest pressure, solid metal, reverse buckling disk that is resistant to vacuum. Designed for installation into sanitary / aseptic piping using the LP-C safety head, the GLP-S adds a new capability for the designer of pharmaceutical, biotechnology, food industry and other clean service pressure relief systems. • Low burst pressures from 5 psi (0.34bar) • Solid metal design • Designed for gas, liquid or two-phase service • Stainless steel, nickel alloy and tantalum materials available • “Fail-safe” design – damage safety ratio <1 • Designed for non-fragmentation • Vacuum / back pressure resistant • High operating ratio; up to 90% of minimum burst pressure • Sizes 11/2 to 4 inch (38-102mm) tri-clamp connections • Ideal for CIP / SIP (clean in place / steam in place) service • Available SAS burst disk sensor option • Utilizes SAF™ technology (structural apex forming) for enhanced performance The type LP-C™ safety head holder with tri-clamp inlet and outlet connections provides quick and easy installation of the GLP-S™ reverse buckling disk into sanitary / aseptic piping. See the table below for the minimum and maximum burst pressures available. For higher burst pressures, please check the availability of the GCR-S type disk (catalog 77-4014). For disks with a coincident temperature exceeding 300ºF (149ºC), 176ºF (80ºC) for Hastelloy®, add 2 psi (0.14bar) to the minimum burst pressure. The GLP-S is a reverse buckling rupture disk designed with a circular score located on the outlet side of the disk dome. At the burst pressure, the disk’s dome reverses and opens by shearing the circular score line leaving a single petal which is held captive by the “hinge ring” integral to the vent side of the disk. The GLP-S uses SAF technology enabling very low burst pressures to be achieved with excellent performance characteristics. The GLP-S disk is designed for use in the LP-C safety head. The nominal size of the GLP-S rupture disk is the same as the inlet and outlet tri-clamp connections. The two halves of the LP-C safety head, with the GLP-S rupture disk installed, are held together using a larger tri-clamp connector supplied with the LP-C holder. The second table below identifies the three tri-clamp connections for each GLP-S disk size; it is the mid-clamp that is supplied with the LP-C holder. The table also identifies the area to be used for GLP-S pressure relief system sizing calculations (MNFA in square inches is provided for calculations in line with ASME practices / NRA in square centimeters is provided for calculations in line with ISO and EN practices). Refer to catalog #77-1002 for safety head information Minimum / Maximum Burst Pressure @ 72°F (22°C) Nickel Rupture Disk and Safety Head Sizes and Connections Disk size Mid-clamp connection Overall height Viton is a registered trademark of DuPont Dow Elastomers LLC.; Inconel® and Monel® are registered trademarks of Inco Alloys International; Tef-Steel® is a registered trademark of Rubber Fab Molding and Gasket; Hastelloy® is a registered trademark of Haynes International, Inc. ® These dimensions correspond to the size of tri-clamp fitting to which the LP-C holder is connected. The connection is the same at the inlet and outlet in all cases and also the same as the disk nominal size. The LP-C safety head nominal size is determined by the inlet and outlet connection size. Example: a 11/2 LP-C safety head has inlet and outlet tri-clamp connections size 11/2 and is designed for use with a size 11/2 inch GLP-S rupture disk.

Optional Sanitary Alert Sensors (SAS) are available for use between standard sanitary / aseptic fittings to provide warning of a burst rupture disk. Burst Pressure Tolerance Options Vacuum Resistance / Back Pressure Resistance The approach to GLP-S disk burst tolerance depends upon which International Code is being followed. • For disks to comply with the ASME Code, please select a “manufacturing design range” and the “burst tolerance” applicable to the required burst pressure (use tables below) • For disks to comply with EN or ISO standards, please select either a “performance tolerance”...