Izolacja wybuchu

The protection method involving the isolation of an explosion prevents flames from escaping outside the installation where the explosion occurred. In the absence of this type of protection, there is a risk that escaping sparks or flames will become effective ignition sources for the surrounding explosive atmosphere within the installation.

Application: The NOVEx II series is a protection system consisting of a passive flap valve for cutting off combustible dust explosions, certified according to harmonized standards EN16447:2014 and EN15089:2009. NOVEx II valves are used to halt the spread of an explosion from dust filters to the inlet of contaminated air and/or the outlet of clean air. In this case, the filter must be additionally protected with explosion panels or explosion suppression.

Basic Information:

• Certified for "Pull" or "Push" installation.
• Used to stop dust explosions in clean air ducts.
• Can be placed in both horizontal and vertical ducts.
• Variable pipe length (5 - 15 meters) between the filter and NOVEx II.
• Certified according to EN 16447 and EN 15089.
• Compliant with NFPA 69:2019 using required options.
• Housing made of carbon steel or stainless steel.
• Suitable for all types of dust (organic, inorganic, and metallic).
• Suitable for dust with a very low Minimum Ignition Energy (MIE) (≥ 1 mJ).
• Maximum pressure (Pmax) ≤ 9.2 bar.
• Maximum deflagration index (Kst) up to 305 bar*m/s.

Dimensions and Versions: NOVEx II return valves with ATEX certification are available in popular sizes from DN100 to DN1250 (DIN 24154/R2, T2). Options include ANSI flanges, detection of open and/or closed valve positions, product deposit detection, automatic cleaning system, valve wear detection, pressure drop monitoring ring, for vertical installation.

Characteristics:

• Application: Return valve for dust explosion partition according to EN16447:2014 and EN15089:2009.
• Diameters: DN100 to DN1250 according to DIN24154/R2, T2.
• Housing: Painted steel (RAL3020), stainless steel AISI304 or 316L.
• Dust Types: Organic, inorganic, and metallic dust.
• Dust Class: IIIA IIIB IIIC - Kst max 305 bar*m/s – Pmax 9.2 bar – MIE ≥ 1 mJ – MIT ≥ 110°C.
• Dust Load: Max. 500 g/m³.
• Available Versions: A (advanced) - NO - all options and mountings; S (standard) - NC - optional position sensors and locks.
• Mounting: Version A - suction or push, horizontal or vertical mounting; Version S - suction only / horizontal mounting; All versions - up to 3 90° bends between the device and the valve; Mounting distance from 5 to 15 m for all DN diameters.
• Operating Temperature: -20°C to +90°C (ambient and process temperature without additional elements).
• ATEX: No changes.

Available Options:

• Position sensor: Stainless steel inductive - PNP output - Ex II 3D Ex tc IIIC T85°C Dc X.
• Closure sensor: Inductive type stainless steel - PNP output - Ex II 3D Ex tc IIIC T85°C Dc X.
• Contamination sensor: Capacitive type - PNP output - II 3D Ex tc IIIC T90°C Dc X.
• Anti-flange: Available as an option (DIN24154/R2).
• Cleaning sequence: Duration 0.5 to 15 s / frequency 0.5 to 45 minutes; Requirements: 24V DC / 1 A power supply - clean, dry compressed air 6-8 bar.
• Consumption detector: Namur type - II 1D Ex ia IIIC T90°C Da Ta: -20...70°C; Required terminal box and spark-proof barrier.

Special Features – Available Solutions:

• Nominal diameter.
• Length.
• Width.
• Height.
• Weight.
• Max pressure.
• Min. volume.
• Max. air velocity.

Pressure Drop – For Versions A and S:

• Normal flow.
• Pressure loss.
• Air flow.

Order Code:

• Product.
• Description.
• Nominal diameter.
• Painted steel.
• Position sensor NXII AC P1.
• Closure sensor NXII AC B1.
• Contamination sensor NX AC DA.
• Pulse cleaner.
• Consumption sensor NX AC DD.
• Ex junction box 2GD.
• Spark-proof barrier N0534A, two-channel, PNP output.

In an unprotected system, it's not the first explosion that causes the most damage, but subsequent secondary explosions. Explosion suppression and explosion-proof construction solve a significant part of the problem, but in both cases, isolation remains crucial. Several methods are available on the market to implement this idea.

Isolation through Existing Process Elements: Several types of explosion isolation can be chosen. Sometimes existing process elements such as rotary valves, roots blowers, screw conveyors, double block and bleed valves, or check valves can be utilized.

Isolation through Passive Elements: We also offer a wide range of passive elements: flame arresters, quick-closing valves VENTEX, and explosion relief chimneys. They operate without external detection or control.

Isolation through Active Elements: There are also several active systems that help stop explosions, such as rapidly closing gates, chemical barriers, fire valves, and switching valves. All are controlled by a detector above the control system.