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EXPLOSION VENTING.

VMP EXPLOSION PANELS by rsbp

WHAT IS EXPLOSION VENTING / EXPLOSION RELIEF?

In most processing applications there is a risk of an explosion given the right conditions. Applications processing common combustible dusts such as flour, sugar, wood, metal, etc. are capable of generating an explosion if a sufficient ignition source is introduced to the vessel and the concentration of dust is of an explosible concentration. When an explosion occurs, the pressure builds rapidly. As soon as the explosion pressures surpass the maximum pressure resistance of the vessel construction, the technology will be destroyed and other connected processes (e.g. via ductwork) are at risk of secondary explosions due to propagation.

Explosion relief panels are specially manufactured sheets of stainless steel which feature a carefully scored path around most sides of the panel edge. This scored path creates a weak outline which will burst at a nominal pressure. 

Explosion vent panels need to be extensively tested and are commonly ATEX certified by a notified body according to EN 14797. There are different types of vent panels to suit a wide variety of applications, and it is important that a specialist is consulted to advise on each individual vessel/process. It is critical that the vent size is determined using the relevant calculation techniques, typically EN 14491 or NFPA 68. Using a panel which is undersized for the intended duty could prove catastrophic. There are several factors to take into account when selecting the correct vent panel, which is why it is so important that a professional, such as Coopatex, is involved in the design process.

When a vessel is protected by a suitably sized explosion vent, explosion pressures will force the vent panel open allowing the pressure & flames to escape the vessel before the explosion can develop to an intolerable level.  The vented explosion needs to be directed towards a safe area. Where this is difficult to achieve, flameless explosion venting or explosion suppression can also be used. To prevent the explosion from propagating towards connected equipment, explosion isolation can used to create an explosion barrier. Click here to read more about explosion isolation.

 

VMP EXPLOSION VENT PANELS

FUNCTIONALITY.

Many plants and processes are protected for the risks of fire in the workplace, but very few are protected for the ever increasing danger of a dust explosion. All you need is a spark from a short circuit in an application or a hot object that enters a process, together with airborne dust, or a simple non-compliance with work safety – and the consequences can be devastating. The risk of explosion arises not only when handling dust but also gas, steam, and hybrid mixtures.

The most inexpensive form of explosion protection is explosion venting. Our explosion vents are suitable for a variety of applications, including those with low operating pressure. Their construction makes them highly efficient, reliable and easy to install, available in a variety of sizes and specifications.

The RSBP VMP membrane is the perfect economical solution for protection against damage and loss in production caused by an explosion. Under normal operating conditions, the venting opening on the application is covered by the explosion venting panel. When the operating pressure level increases inside the device due to the start of an explosion, the venting panel is burst open, and thus the pressure and flame are released from the protected space. The application (e.g. dust filtration unit) is exposed to a lower pressure than its pressure resistance and so won’t be destroyed. The VMP Explosion venting device is certified according to standard EN 14797.

explosion relief vents

COMPOSITION.

Thanks to the construction and design of the VMP explosion venting device, installation is easy. This range of explosion venting devices is suitable for many types of applications, including dust filtration units, silos, bins, mills, crushers, cyclones and more. 

The VMP explosion venting device is available in a variety of sizes and specifications, as well as a range of accessories such as an opening indicator, intrinsically safe relay, thermal insulation and frames or flanges. This means the VMP can suit almost any type of application. 

VMP explosion venting

VMP RANGE.

The different types of VMP explosion venting device are; VMP D (domed rectangular, certified according to EN 14797, 2014/34/EU), VMP F (flat rectangular, certified according to EN 14797, 2014/34/EU) and VMP SU (domed triple skin, certified according to EN 14797, 2014/34/EU). The whole range is available in mild steel and stainless steel.

The VMP F is suitable for installation without a top flange and the radius of the curve can be altered at request. The VMP D  has an operating temperature of up to 100 degrees Celsius. 

The VMP SU is available with PTFE insulation, can be used on devices that have an operating temperature of up to 240 degrees Celsius and is also suitable for equipment with pressure shocks.

ACCESSORIES.

The VMP explosion vent panel can be supplied with a variety of optional accessories. These accessories do not affect the functionality of the vent panel itself, but instead act to improve the signalling to the plant operators that an explosion has occured and to check the application, replacing the panel if it has burst. It is for this reason that we recommend keeping spare panels on site in case of an activation. In addition to the signalling devices, there is also available intrinsically safe relay, thermal insulation, EPDM seal or FDA Food grade silicon gasket and installation frames. Please contact us for more information.

OPENING INDICATOR G1

As the vent panel bursts, the G1 opening indicator cable is interrupted and thus sends a signal to the customer alerting the disruption.

OPENING INDICATOR G2

The G2 opening indicator works the same as G1, although instead of a cable, a magnetic sensor and a magnet are used. If the VMP is opened in an explosion, the magnetic sensor and the magnet move away from each other, the contact is broken and customer receives signal.

OPENING INDICATOR G3

The G3 opening indicator can be retrofitted to the VMP panel. If the VMP is opened during an explosion, the cable will be broken and customer receives signal. An intrinsically safe circuit must be used as an interruption evaluation device.

CONTACT US

We are waiting to discuss your explosion safety requirements, so don’t hesitate to get in touch. Whether you would like to receive a quotation or you are just looking for more information, we are here to help.

Email

sales@coopatex.co.uk

Phone

0208 243 8914