LD Rupture Disc

Composite Rupture Disc

The LD composite rupture disc includes a slotted metal top section with a fluoropolymer or metallic seal on the process side. It is ideal for primary or secondary system relief protection, and an optional non-fragmenting design can provide fugitive emission control when used to isolate a safety relief valve. The Composite Rupture Disc is recommended for use in systems that have a maximum operating pressure of up to 80% of the rupture disc’s marked burst pressure.

The LD includes a high-visibility flow direction tag for easy installation, correct orientation, and at-a-glance inspection. All LD rupture discs 1″ (25 mm) nominal size and above include a flow direction tag.

The LD is suitable for static, cyclic, or pulsating operating conditions but requires a vacuum support to withstand vacuum. When ordering, please specify if your application requires a non-fragmenting disc.

Our seven-hole pattern

Our composite rupture discs are designed with a seven-hole pattern at the apex of the rupture disc dome and six radiating precut sections. Used in conjunction with a non-metallic or fluoropolymer seal, these elements prevent fragmentation when rupturing.

The seven-hole pattern allows construction with heavier materials, resulting in a higher maximum recommended operating ratio – up to 80%.

Nominal sizes: 1″-12″ (25-300 mm)

Seating configuration: 30° angular seat
Ideal for full bolted, insert, and union disc holders.

Burst pressure range: 2-1,440 psig (0,138-99,3 barg)
Table 5 – Minimum/Maximum Burst Pressures for Preformed Composite
Rupture Discs at 72˚ F (22˚ C)
Table 2A – 
Burst Tolerances and Maximum Recommended Operating

Operating temperature: Up to 1,000°F (538°C)
Dependent on seal materials – see Table 3, Maximum Temperature
for Rupture Disc Materials, Liners, and Coatings

Manufacturing range: See table 2, Manufacturing Ranges
Special and reduced manufacturing ranges are available upon request.

Available in a variety of materials to resist highly corrosive media and atmospheric conditions.

Specified and MIN/MAX Rating Types are also available.

We manufacture options and accessories to ensure our rupture discs perform in any environment. Consult a representative if you aren’t sure which you need.

The design of the LPLV allows for the use of highly corrosion resistant seal materials such as fluoropolymer or exotic metallic materials. The burst rating of the rupture disc is determined by the slotted metal top section, so the seal or liner can be made of thin corrosion resistant materials and still provide a wide range of burst pressures.

This disc is available to be cleaned for oxygen or chlorine service.

Dent protectors
Guard your rupture disc with a dent protector if the outlet dome (vent side) is exposed or at risk of damage.

Get a tight seal, even on scratched or pitted disc holders, by installing a gasket.

Handling supports
Improper handling during installation can affect your disc’s burst pressure setting. Use handling supports when installing thin or delicate rupture discs to prevent damage.

Protective rings
Prevent damage to fragile rupture discs and delicate liners from foreign material in the seating area by adding a protective ring.

Vacuum supports
Protect your rupture disc from vacuum conditions with a vacuum support. Consult your LaMOT rep if you need to protect against back pressure higher than 14.7 psig (1,01 barg).

  • When ordering a rupture disc that will encounter vacuum conditions, please specify the exact conditions.
  • We manufacture our vacuum supports to be an integral part of the rupture disc.
  • Vacuum supports are permanently attached to ensure proper installation.


We’ve spent decades refining our manufacturing processes with efficiency and agility in mind. We’re ready to put our methods to work for you.