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Explosion Isolation

Explosion Isolation

Explosion isolation is surely implemented to safeguard the surrounding personnel as well as machinery. An explosion can continue to truly gain momentum, creating secondary explosions and fires. Although explosion venting or suppression is present, a dust explosion can still travel backwards. It will travel from the process vessel across the inlet ductwork and into the connected equipment in other process areas.

Generally, explosion isolation involves “blocking” an explosion through the process ductwork. The aim here is to stop it from traveling any further. There are three forms of explosion isolation. First is the Explosion Suppression, find the other two below.

You can also use Explosion isolation on a dust collector, process vessel or any other equipment. In this case, it will be used along the connecting ductwork and adhering to the installation distance from the vessel.

Dust Collector Isolation

In truth, the most common scenarios for a dust explosion to occur is in fact, within a dust collector. In effect, a dust collector surely plays host to a large amount of dust. For instance, if this combustible dust disperses in the air and ignites, the result is catastrophic. Explosion venting will then avoid that risk.

However, in some cases, the dangerous pressure waves and flames can travel backwards through connecting ductwork. This requires the use of an explosion isolation valve, also referred to as a non-return valve, flap valve or barrier valve. In the event of an explosion, first the pressure waves forces the flap to shut blocking further distribution of the explosion pressure and/or flames through the connecting process ductwork, ensuring then, dust collector isolation against explosions. If you require more in detail information on how to protect your dust collector, please contact Euratex immediately.

The Solutions

passive mechanical isolation

barrier valves

passive mechanical isolation

Passive mechanical isolation is certainly 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). Once an explosion begins to propagate through the ductwork, the mechanical flap within the valve will then slam shut. The Valve is in fact, held down in place by the pressure waves. Therefore, the barrier created stops the explosion in its tracks. Furthermore, our valves have a robust construction. Due to that fact, you can reuse them after a quick inspection, saving you on cost and downtime.

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BFV

Passive Mechanical Isolation

image of Explosion barrier valves from Euratex

FAV

Passive Mechanical Isolation

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SNR

Passive Mechanical Isolation

VENTEX Valve

passive explosion isolation

Indeed, the VENTEX® ESI is a passive explosion protection valve with years of proven operational reliability. Thus, it acts as both, an effective and reliable pressure and flame arrestor, without the use of external energy.

When idle, so without air flow, the closing device is again in the open position. During normal operation, the processed product flows around the open closing device. To explain, when an explosion occurs, the pressure wave then pushes the closing device against the closing device seal. As a result, the valve gets locked in this closed state. Thus, preventing the spread of flames and pressure waves. VENTEX ESI-E/-D valves are, of course, suitable for explosion protection in both directions.

The VENTEX valve is suitable for high, medium and low pressures. Also, for metallic dusts, hybrid mixtures, gases and organic dusts, as well as all common product.

Euratex are proud to offer servicing for the VENTEX valve as well as all the spare parts package.

ventex explosion isolation

active mechanical isolation

rapid acting valve & systems

active mechanical isolation

Active mechanical isolation involves the use of a rapid acting valve too. These rapid acting valves are 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 and 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. Since you don’t need to return it to the manufacturer, savings are then made in spares holding and downtime. The result is a cost-effective solution for plant designers and end users for all industries.

Rapid acting valve from Euratex

rapid isolation system

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. Therefore, sparks and/or burning particles stop before they can propagate to other parts of the process. Conveying air and combustible powder feeds will immediately shut down independent of any conveying systems.

Rapid Closing Speed

The closing speed of the metal barrier is for instance, measured in milliseconds. RAPIV’s largest valve takes in fact, only 36 milliseconds to close fully from receipt of a close signal.

Bi-directional System

The RAPIV is truly bi-directional. In brief, effective isolation is achieved irrespective of the direction of flow. 

Accurate Design

The RAPIV Isolation Valves can certainly be built to the exact bore of the pipe you want to isolate. Of course, within the range of 50 to 250 mm diameter. 

Incorporated Test Facility

The system also incorporates a test facility. Consequently, you can manually activate the valve and test the input detection circuits. 

RAPIV Isolation Valve Construction

Generally, the valve body, plate and pressure components are from aluminium machining. The valve stem is stainless steel. However, we can supply a stainless steel valve plate and liner (for stainless steel contact parts) if needed.

Similarly, all metal parts are machined. To explain, machining provides high accuracy and fabrication within very close tolerances.

Main valves seals are PTFE thus, allowing an almost friction free movement to the valve plate. Piston bearings and seals are also manufactured from PTFE based polymers. As a result, it provides long life as well as a low friction without the need for lubrication.

On one hand, the high speed solenoid valve opens within 10 milliseconds. Allowing then, a very high flow rate (>5000<12000L/min). On the other hand, the slow open/close solenoid valve incorporates a manual control button for valve control/testing without power supplied.

Air supply connections convert into a polycarbonate sealed enclosure. This enclosure houses the control solenoid and main reservoir non return valve.

ventex valve - passive explosion isolation

Again, the VENTEX® ESI is a passive explosion protection valve with years of proven operational reliability. Thus, it acts as both, an effective and reliable pressure and flame arrestor, without the use of external energy. It certainly adapts to meet each individual need. And has the ability to work with reverse air flow as well as normal air flow production. 

The VENTEX valve is available from size DN100 up to DN600. And suits low, medium or high pressures with minimal pressure drop in the pipe. It is advisable for a low dust load and all common media. For example, metallic dusts, hybrid mixtures, gases as well as organic dusts. Also, the VENTEX valve is suitable for low, medium or high process temperatures. And a maximum flow velocity of 25 m/s. It is available as single acting (EI-E) or double acting (ESI-D) operation modes. Or alternatively as a check valve (ESI-C) – this is what truly makes the VENTEX a great solution to suit individual case needs. Moreover, you can install it in a vertical or horizontal position, which makes for a flexible installation design too. 

VENTEX® ESI-C

Idle position
Normal operation
VENTEX ESI-E-C Explosion
Case of explosion

VENTEX® ESI-D

Idle position
Normal operation
VENTEX ESI-D Explosion
Case of explosion

VENTEX® ESI-E

Idle position
Normal operation
VENTEX ESI-E-C Explosion
Case of explosion
logo Explosion isolation Euratex
logo explosion isolation Euratex

Euratex are proud to be the Official UK Partner for RSBP

bfv - explosion barrier valves

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The BFV explosion barrier valve is a mechanical device. It has been designed to prevent the propagation of flame and pressure between pieces of equipment within a process area. For example, when an explosion occurs within a contained vessel (such as a dust filter unit), it will gain momentum and travel through connected ductwork. Thus, spreading rapidly through to other areas of the process. Therefore, it will certainly cause a much larger explosion, damage to neighbouring machinery/equipment and will truly put lives at risk. Implementing an explosion barrier valve, such as the BFV, will swiftly isolate the explosion. And also, minimise costly damage and risk.   

Fully ATEX certified to the latest standard of EN16447

The BFV explosion isolation valve is compiled for the design and testing of passive flap-type valves for use in dust carrying pipes and ducts. The BFV also meets NFPA 68 approval. To list some advantages:

  • A passive device for isolating dust explosions
    Incorporates a latching device
  • High pressure resistance
    Optional position indicator
  • Mechanical device that doesn’t 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)
  • Available in stainless steel or mild steel with a surface finish of Kamoaxit (RAL 3000 – red).

Normally Open Flap

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 then 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.

Explosion barrier valves guide from Euratex
a guide to Dust collector isolation from Euratex

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

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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 through the mechanical position indicator (green tab).

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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Servicing the whole of the United Kingdom with Explosion Isolation

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