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Explosion Panels Protect Your Equipment

Explosion Panel Diagram


 Flowseal Bursting Discs & Explosion Vent Panels are manufactured to comply with the requirements of the American NFPA 68, 2007 edition entitled Guide for Venting of Deflagrations and also the German VDI-3673, 1995 edition and are tested and certified in compliance with BS 2915 : 1990, the Specification for Bursting discs and bursting disc devices.

Flowseal Explosion vent panels can be of the multi ply composite slotted type or of the domed one piece construction type. The accuracy of response is within 10% of the certified burst pressure and the response is immediate.

General Design

Flowseal Explosion Vent Panels are manufactured with controlled opening patterns that ensure full opening on initial rupture and can be fabricated to any size, and can be circular, rectangular or curved. They can be supplied in a variety of different configurations depending on temperature, pressure, medium etc.


All Flowseal Vent closures are designed to withstand natural forces such as wind loads and operating conditions such as pressure fluctuations and the effects of temperature, abrasion and corrosion.


Frames are designed to completely support the panels and to ensure that the panels can rupture as planned without any hindrances or distortion that may adversely affect the bursting pressure or the vent area.

The frames are generally drilled to suit customer requirements.

For composite slotted type panels, if the system is under negative pressure, the frame must incorporate vacuum support bars designed to support the panels under full negative pressure. In calculating vent areas, the area of the vacuum support frame is to be taken into account.

Panels (Support and Burst)

All Flowseal multi ply composite panels incorporate a support panel on the inside, this is to prevent abrasion and or damage to the seal membrane as well as preventing the seal membrane being sucked inward due to negative pressure.

Multi ply composite slotted panels and single ply domed panels all conform to the NFPA 9-4.3.2 requirement relating to the inertia of vent closures, and that is that the mass must not exceed 12.2kg per square metre.

Vibration Damping

In all composite slotted type panels, a layer of ceramic fibre is inserted between the support panel and the seal membrane to minimise the effects of vibration brought about by the turbulence of passing air or the pulsing of a pulse type bag filter.

Seal Membrane

The seal membrane is generally made out of a ply of PTFE non permeable foil or other material suitable for the operating temperature and medium.


Flowseal Bursting discs and explosion panels are manufactured so that in the event of an explosion, all parts are retained, there will be no shrapnel or fragmentation.

Burst Detection

Burst detection can be provided if required simply by means of a break wire system or by means of encapsulated reed switch and magnet.

Burst Testing and Certification

Burst testing is done in the Flowseal factory and complies with the requirements of BS 2915:1990. At least one panel of every batch is tested in order to provide certification.

Tags and Signage

All panels supplied are fitted with tags which indicate the static burst pressure of the panel, and are equipped with a bold sign stating in large lettering “DANGER – EXPLOSION VENT – KEEP CLEAR”



In a plant that handles grain, plastics, animal feedstuffs, coal, sugar or a variety of other dusts or gasses, there is a very real danger of explosion. Examples of industrial equipment in which explosive conditions may occur are:

  • crushers
  • grinders
  • pulverisers
  • sieves
  • screens
  • bolters
  • dust collectors
  • dust arrestors
  • conveyors
  • screw feed conveyors
  • bucket elevators
  • driers
  • cyclones
  • ovens
  • furnaces
  • spray driers
  • blenders
  • mixers
  • ducts
  • pipes
  • bins
  • silos
  • spreaders
  • coating machines
  • packaging equipment
  • hoppers


Dust or gasses contained in this equipment will burn rapidly if ignited. This will lead to a quick rise in pressure within the system and, in the extreme, a devastating explosion. Dust can be ignited by:

  • flames
  • hot surfaces
  • incandescent material
  • spontaneous heating
  • welding or cutting
  • friction heating or sparks
  • impact sparks
  • electric sparks
  • electrostatic discharge


A Flowseal explosion vent panel is an economical and effective way to protect both personnel and capital equipment from severe damage