Isolation Seal Rupture Disc

LaMOT Brand of Rupture Discs and Valves & Arrestors. Manufacturing quality products, using proven techniques, industry standards, and modern manufacturing methods since 1964.

Isolation Seal Rupture Disc

Composite Rupture Disc

Isolation Seal Rupture Disc

The Isolation Seal (IS) Rupture Disc is a flat, composite designed rupture disc that installs between standard bore, 150# ASME bolted flanges. This rupture disc is not prebulged but flat. The operating pressure is 50% of the rupture disc's minimum burst pressure. Flat, non-asbestos gaskets are permanently affixed to the rupture disc's process and vent sides for easy handling and installation. There is no holder required.

The "IS" series rupture disc is typically used for:

  • Low pressure relief of atmospheric storage tanks
  • Downstream relief valve manifold isolation
  • A corrosion barrier
  • An environmental seal

As a standard, the "IS" Rupture Disc is manufactured with a top section of 316SS, Alloy 600, Alloy 400 or Nickel, with a fluoropolymer seal and a non-asbestos gasket on each side of the rupture disc. Polyethylene seals may be used for low pressures.

Two designs are available in the flat "IS" Rupture Disc:

IS-1 - Bursts in one direction only

IS-2 - Bursts in an identical rating in either positive or vacuum direction



Manufacturing ranges are shown in Table 2 for LaMOT Brand Products.  Special and reduced manufacturing ranges are available upon request.  For Burst Tolerances and Recommended Operating Pressure see Table 2A. Tables 2 and 2A are based on the RATED Rating Type. Specified and MIN/MAX Rating Types are also available. For available burst pressures, refer to Table 7.


The LaMOT Brand three dimensional (3-D) flow direction tag provides instant visual verification that the rupture disc has been correctly oriented into the system. The 3-D tag extends beyond the holder to insure clear visibility for easier installation and inspection after the rupture disc has been installed.

Tags, as a standard, are attached to all Composite rupture discs 1” (25 mm) nominal size and above.


ISO 9001 Certification

CE Certificates - The European Pressure Equipment Directive


ATEX Rupture Disc Device Certificate of Assessment

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