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Explosion Isolation

Even if explosion venting or suppression is present, a dust explosion in a process vessel can still travel backwards via the inlet ductwork to connected equipment in other process areas. The explosion can continue to gain significant momentum, creating secondary explosions and fires, posing a severe risk to surrounding personnel and machinery. To safeguard against this, explosion isolation is implemented.

Generally speaking, explosion isolation involves “blocking” an explosion from travelling any further via the process ductwork. There are three forms of explosion isolation, two of which are listed below. The other is Explosion Suppression. 

The Solutions

rapid acting valves & systems

active mechanical isolation

Active mechanical isolation involves the use of a rapid-acting valve (also known as a “knife gate” or “slam shut” valve).  

The Euratex rapid-acting isolation system is comprised of the following:

  • Control Unit (single or multiple zones)
  • Detectors; either for pressure (static over pressure or rate of pressure rise) or sparks
  • Suppressors; to hold & release the extinguishing agents

If exposed to flame, only an in-situ inspection of the seals and valve plate is required before re-entering service. This means the unit does not necessarily need to be returned to the manufacturer.  Savings are made in spares holding and down-time as a result, meaning an overall cost-effective solution for plant designers and end users in all industries.

RAPIV

rapiv isolation system

barrier valves

passive mechanical isolation

Passive mechanical isolation is the most common form of explosion isolation. It involves installing a barrier valve (also known as a “Non-Return Valve” or “Flap Valve”) within the ductwork (usually between 3 to 7 meters from the inlet). When an explosion begins to propagate through the ductwork, the mechanical flap within the valve slams shut, held down in place by the pressure waves. The barrier created stops the explosion in its tracks, and the robust construction of our valves means that they can be reused after a quick inspection, saving you on cost and downtime.

BFV

Passive Mechanical Isolation

FAV valve

FAV

Passive Mechanical Isolation

SNR

Passive Mechanical Isolation

active mechanical isolation

rapiv - rapid acting isolation

Used to mechanically isolate a pipe or duct rapidly

Using plant compressed air (without the need for pyrotechnic actuators or gas generators), the RAPIV range of valves quickly establish an impenetrable meta barrier. Sparks and/or burning particles are arrested before they can propagate to other parts of the process. Conveying air and combustible powder feeds are immediately shut down independent of any conveying systems.

Rapid Closing Speed

The closing speed of the metal barrier can be measured in milliseconds. where the largest valve takes just 36 milliseconds to close fully from receipt of a close signal. 

Bi-directional System

The RAPIV is bi-directional. This means that effective isolation is achieved irrespective of the direction of flow. 

Accurate Design

The RAPIV Isolation Valves can be built to the exact bore of the pipe to be isolated, within the range of 50 to 250mm diameter. 

Incorporated Test Facility

The system also incorporates a test facility to manually activate the valve and test the input detection circuits. 

RAPIV Isolation Valve Construction

The valve body, plate and pressure components are machined from aluminium. The valve stem is stainless steel. A stainless steel valve plate and liner (for stainless steel contact parts) can be supplied.

All metal parts are machined, to provide high accuracy and fabrication within very close tolerances.

The main valves seals are PTFE allowing an almost friction free movement to the valve plate. The piston bearings and seals are also manufactured from PTFE based polymers providing long life and low friction without the need for lubrication. 

The high speed solenoid valve opens within 10 milliseconds and allows a very high flow rate (>5000<12000L/min). The slow open/close solenoid valve incorporates a manual control button for valve control/testing without power supplied. 

Air supply connections are made into a polycarbonate sealed enclosure which houses the control solenoid and main reservoir non return valve. 

passive mechanical isolation

Euratex are proud to be the Official UK Partner for RSBP

bfv - explosion barrier valve

The BFV explosion barrier valve is a mechanical device designed to prevent the propagation of flame and pressure between pieces of equipment within a process area. When an explosion occurs within a contained vessel (such as a dust filter unit), it will gain momentum and travel through connected ductwork, spreading rapidly through to other areas of the process. This causes a much larger explosion, damage to neighbouring machinery/equipment, and will put lives at risk. With an explosion barrier valve, such as the BFV, the explosion is swiftly isolated, minimising costly damage and risk.   

The BFV explosion isolation valve is fully ATEX certified to the latest standard of EN16447, (the standard which is compiled for the design and testing of passive flap-type valves for use in dust carrying pipes and ducts). The BFV is also meets NFPA 68 approval. Some advantages are:

  • A passive device for isolating dust explosions
  • Incorporates a latching device
  • High pressure resistance
  • Optional position indicator
  • Mechanical device that does not require power
  • Wide variety of sizes from DN100 to DN800
  • Suitable for ST1 and ST2 zone 20 operation (up to DN400), and ST1 zone 20 operation (up to DN800). 
  • Suitable for technologies working with light metal dust (please consult with Euratex for metallic dust use)
  • The BFV is available in stainless steel or mild steel with a surface finish of Kamoaxit (RAL 3000 – red).

Most barrier valves rely on the process air flow to keep the flap open, but the BFV maintains a “normally open flap” state. In normal operation, the pressure flap is held open by a mechanical latch. When an explosion occurs, the flap is forced closed by the explosion pressure wave and locked in place, thus preventing the spread of the explosion to other parts of equipment or production technology.

The BFV incorporates an inspection hatch, which makes maintenance access of the valve very simple.

An optional position sensor is available. The sensor will send a signal to indicate the position of the flap (open/closed). The signal is determined via the mechanical position indicator (green tab).

Technical Specification

GET A QUOTE

Contact us with your information and we will provide you with a quote based on the product, size and material you require.

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