LD Rupture Disc

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

LD Rupture Disc

Composite Rupture Disc

LD Rupture Disc

The LD is the basic Composite Rupture Disc and consists of a slotted metal top section, with a fluoropolymer or metallic seal on the process side.

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 Composite Rupture Disc is ideal for static, pulsating or cyclic operation condition, but requires a vacuum support to withstand vacuum.

When ordering a Composite Rupture Disc, specify when your application requires the use of a non-fragmenting design rupture disc.

The Composite Rupture Disc is an ideal choice for primary and/or secondary system relief protection and the non-fragmenting design provides an effective means of fugitive emission control when used to isolate a safety relief valve.


The 30° angular seat design Composite Rupture Disc is available in nominal sizes 1” through 12” (25 - 300 mm) for use in Full Bolted, Insert Holders and Union rupture disc holders.

Pressure ranges from as low as 2 psig through 1,440 psig (0,138 - 99,3 barg) are available in a variety of different materials. Refer to Table 5 for available burst pressures for the Composite Rupture Disc.

Because of the availability of a variety of different seal materials, the Composite Rupture Disc can perform at temperatures up to 1,000°F (538°C) and resist most corrosive and atmospheric conditions. Refer to Table 3 for recommended maximum operating temperatures of Composite Rupture Disc materials.

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.


The LaMOT Brand Composite Rupture Disc top section is manufactured with a seven-hole pattern at the apex of the rupture disc dome. This seven-hole pattern, along with the six precut sections, provides a non-fragmenting design when used with a non-metallic or fluoropolymer seal.

With the seven-hole pattern, heavier materials of construction can be used. This results in a higher maximum recommended operating ratio – up to 80%.

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.


The Composite Rupture Disc is available to be cleaned for oxygen or chlorine service. Other rupture disc options are available for the Composite Rupture Disc such as protective rings, gaskets, handling supports, dent protectors and vacuum supports. For more information on these items, see Rupture Disc Options.

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



LD Rupture Disc


ISO 9001 Certification

CE Certificates - The European Pressure Equipment Directive


ATEX Rupture Disc Device Certificate of Assessment

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