B.D.I.® (Burst Disc Indicator)

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

B.D.I.® (Burst Disc Indicator)

B.D.I.® (Burst Disc Indicator)

The B.D.I. Alarm System is designed specifically for use with LaMOT Standard and Composite rupture discs.

The B.D.I Alarm System consists of an alarm strip, interfaced with a monitoring unit, computer, annunciator panel, control panel, or other equipment. The alarm systems is activated by the opening of a rupture disc.

The B.D.I. Alarm System is a normally closed, low-powered circuit. When a rupture disc opens, the alarm strip is severed, interupting the circuit which activates a monitoring device, sold separately. This device is used to signal that an overpressure condition has occured and the media is venting.



Maximum current: 50 milliamps
Maximum voltage: 24 VDC RMS
Operating temperature range: 40°F to +400°F (‑40°C to +204°C)

Click here for Minimum relieving pressures

The B.D.I. Alarm Strip is composed of copper conductors adhered to a thin strip of KAPTON® film. Tantalum conductors are available for some applications. The conductors pass through the flange gasket facing for Universal B.D.I. designs, terminating with your choice of a molded plug or bare leads. 
The Universal B.D.I. design is compatible with rupture disc/holder assemblies designed to install between bolted flange standards including ASME, DIN, JIS, see bolting class Table for available flange classes.  Custom designs are also available, contact the factory for details. Standard gaskets are asbestos free fiber-bound material or an optional GYLON® 3500 silica filled PTFE material.

Linking the B.D.I. Alarm Strip to the monitoring system is the B.D.I. Lead Wire Assembly. A two-pin bullet plug protects the terminals at the connecting point against moisture. It is abrasion resistant, flexible, and highly weather-resistant. An alternate bare leads end of shielded cable is also available in 6 ft (2m), 10 ft (3m) and 20 ft (6m) lengths.

Use the B.D.I. Lead Wire Assembly to connect the B.D.I. Alarm Strip with a Standard Plug B.D.I. Connection to the B.D.I. Alarm Monitor. The B.D.I. Lead Wire Assembly is available in 6, 10, 20, 50, 75, 100, 200 and 300 foot lengths with a Standard Plug B.D.I. Connector and a Lead Wire Strain Relief Device on one end and bare leads on the other.



The B.D.I. Alarm Strip is designed to break when its correspond­ing rupture disc bursts. The design has been proven through years of testing, both in the field and in our ASME accepted flow testing laboratory. This testing has proved the reliability of the alarm strip when used with LaMOT rupture discs. The B.D.I. Alarm Strip does not affect the life or performance of the rupture disc.

The B.D.I. Alarm Strip is carefully designed and manufactured with the following features in mind:
  - Resistant to chemical attack and corrosion
  - Usable over a wide range of temperatures
  - Easily replaceable upon disc rupture
  - Compatible with standard design LaMOT rupture discs 


ISO 9001 Certification

CE Certificates - The European Pressure Equipment Directive


ATEX Rupture Disc Device Certificate of Assessment

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