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.

Additional materials