BS&B LPS Reverse Buckling Disk
U.S. patents 5,996,605 and 6,178,983 apply. Other patents pending.
The Low Pressure LPS™ Reverse Buckling Disk and SRB-7RS Safety Head
LPS Rupture Disk (Bursting Disc) Features:
Solid Metal Design
Low burst pressure from 5 psig (0.35 barg)
Designed for gas, liquid or two phase service
Fail Safe: Damage Safety Ratio ≤1
Designed for non-fragmentation
Vacuum/back pressure resistant
High Operating Ratio: 90% of Minimum Burst Pressure
Reverse Buckling Disk in sizes: 1"-8" (25 mm-200 mm)
For installation in BS&B type SRB-7RS pre-torqued safety head
The LPS Rupture Disk (Bursting Disc) was developed to provide low burst pressures from 5 psig (0.35 barg) using reverse buckling rupture disk technology. The LPS Rupture Disk (Bursting Disc), combined with the SRB-7RS® Safety Head, provides accuracy and reliability. The LPS uses SAF™ technology (Structural Apex Forming™) enabling very low burst pressures to be achieved with excellent opening characteristics.
LPS Rupture Disk (Bursting Disc) Material Options
The LPS Rupture Disk (Bursting Disc) is available in a range of corrosion resistant materials (see table on opposite page for details).
Standard disk materials are Nickel alloy 200, Stainless Steel grade 316, Inconel® (Nickel alloy 600), Monel® (Nickel alloy 400), Hastelloy® C-276, & Tantalum.
The LPS disk includes an outlet side hinge to control fragmentation. Standard disk hinge material is Stainless Steel grade 316 with alternates available upon request. Tef liners are offered with the type LPS Rupture Disk (Bursting Disc) at burst pressures of 35 psig (2.4 barg) and higher.
Flow Performance/KR Values/Rupture Disk (Bursting Disc) Sizing
Flow resistance factor, "KR," may be used to determine the relieving capacity of a
system when using techniques such as those described in Crane Technical Paper No. 410. Individual KR values have been established for both gas & liquid service for the LPS disk. These are experimentally determined at the BS&B Safety Systems, L.L.C. flow laboratory following ASME procedures and witnessed by ASME representatives. Care must be taken to use the correct value for sizing purposes. When KR values are marked on the LPS disk tag, those for gas service are shown as "KRg," and those for liquid service are shown as "KRl."
When using KR value for sizing calculations, the nominal pipe size (assuming schedule 40 pipe), of the vent system is used. When using "coefficient of discharge" sizing techniques, the Minimum Net Flow Area or Net Relief Area of the rupture disk (bursting disc) device is used.
MNFA Values and NRA Values
Installation in SRB-7RS™ Safety Head
The LPS disk installed in an SRB-7RS™ Safety Head permits the correct torque to be applied in the workshop before installation into the process. The asymmetric locating pins ensure centering and orientation of the disk within the safety head. The performance-proven metal-to-metal "bite-type" seal in the safety head (2"/50 mm size and above) assures a leak-tight assembly. When installed properly into the SRB-7RS Safety Head, the assembly can be removed, inspected, cleaned carefully then reinstalled without replacing the disk as the pre-torqued cap screws maintain the clamp load on the disk.
The SRB-7RS Safety Head is used with other rupture disks (bursting discs) (types S-90™, JRS™, RLS™ and FRS™) of the STA-SAF® System, Catalog 77-4001. The use of a common safety head facilitates upgrading from these rupture disks (bursting discs) to the superior technology of the LPS Rupture Disk and its higher pressure companion, the SKR Rupture Disk (Bursting Disc); see catalog 77-4003.
Note: LPS disk petal is retained by the interaction of the disk hinge and the SRB-7RS™ Safety Head.
U.S. Patent 4,751,938 and other international patents pending.
Inconel® and Monel® are registered trademarks of Inco Alloys International. Hastelloy® is a registered trademark of Haynes International, Inc.
SRB-7RS Safety Head Dimensions
Safety Head Dimensions
For more information on other BS&B products, see Catalog 77-1010 for Burst Alert® Sensors compatible with the LPS Rupture Disk (Bursting Disc) and catalog 77-1016 describes the SmartDisk™ wireless rupture disk monitoring system. Refer to our websites to learn more.