Explosion safety

Turnkey Solutions

The Wolff Group, consisting of TESSA, ATEX and LEWTECH, is one of the very few companies in this part of Europe to perform comprehensive ATEX compliance projects for new workplaces, facilities and installations as well as revamping existing ones.


Our services include:

  • working out formal and legal issues,
  • limiting explosion hazard areas, hazard assessment,
  • explosion protection of equipment and vessels.

Explosion Suppression

Explosion suppression systems offered by Tessa protect process equipment against explosion effects. The system is designed to detect an explosion in its earliest stages and provide an immediate response so as to extinguish the explosion source before it becomes catastrophic to the plant and personnel.

The basic type of explosion suppression system consists of a dynamic pressure increase sensor, pressure containers with extinguishing agent and an electronic system control unit. The pressure sensor continuously monitors pressure fluctuations inside the explosion-protected equipment. System activation depends on the rate of pressure rise (ΔP/Δt) inside the process vessel, according to the product’s explosion characteristic – the Kst constant (value characteristic for a given flammable and explosive product). In the event where the measured ΔP/Δt value corresponds precisely to the product’s Kst index, the electronic control system interprets the signal from the pressure sensor as an occurrence of “initial explosion stage” which will trigger an immediate opening of the cylinder with extinguishing powder and its injection into protected equipment. The total response time, from the moment of detecting an “initial explosion stage” until it is extinguished, is of the order of milliseconds (less than 1 second).

The benefits of an explosion suppression system include:

  • protection of process equipment and piping in enclosed spaces,
  • flamable, toxic or valuable materials are retained within the process equipment (environment protection),
  • there is no risk of the product being burnt after an explosion (no fire after explosion),
  • the effects of an explosion are reduced to a minimum,
  • the system is guaranteed to activate only in the event of an explosion,
  • insensitivity to changing processing conditions inside process equipment (pressure fluctuations),
  • the solution is suitable for pharmaceutical and food applications.
HRD-E Suppressant Containers
HRD-E Suppressant Containers

HRD-E Suppressant Containers

Applications: protection of silos, filters, cyclones, mixers, dryers, granulators, etc., where flammable materials are present in explosive concentrations, HRD cylinders are used across every industry for the protection of any tanks,…
 

HRD-E Suppressant Containers »
MEX-3.2 Explosion Multisensor

MEX-3.2 Explosion Multisensor

Applications: an element of the protection system for vessels and process equipment where flammable and combustible substances are handled in explosive concentrations, identification of explosion pressure rise, in its early…
 

MEX-3.2 Explosion Multisensor »
DG-IR-3C Infrared Detector

DG-IR-3C Infrared Detector

Applications: a protection system element to be installed in ducts and pipelines connected to bucket conveyors, filters, tanks and other equipment for immediate detection of explosion events, identification of ignition…
 

DG-IR-3C Infrared Detector »
IR-13 Infrared Detector

IR-13 Infrared Detector

Applications: a protection system element to be installed in ducts and pipelines connected to bucket conveyors, filters, tanks and other equipment for immediate detection of explosion events, identification of ignition…
 

IR-13 Infrared Detector »
Particulate Emission Monitors

Particulate Emission Monitors

Applications: detection of damaged filtration media, monitoring for excessive concentrations of flammable dust in clean air ducts.
 

Particulate Emission Monitors »
EX 100.1 Single-Zone Control Unit

EX 100.1 Single-Zone Control Unit

Applications: control unit for an explosion protection system (HRD containers, pressure and infra-red detectors), this single-zone control unit performs the following control and diagnostic functions: system monitoring, distribution of stored…
 

EX 100.1 Single-Zone Control Unit »
EX 8000 / EX 5000 Multi-Zone Control Unit

EX 8000 / EX 5000 Multi-Zone Control Unit

Applications: control unit for an explosion protection system (HRD containers, pressure and infra-red detectors), this multi-zone control unit performs the following control and diagnostic functions: system monitoring, distribution of stored…
 

EX 8000 / EX 5000 Multi-Zone Control Unit »

Explosion Venting

Explosion relief (a.k.a. explosion venting) is an established method of protecting process equipment by reducing the explosion pressure within the equipment to a safe level (Pred). Explosion vent panels or explosion doors burst open at a set pressure allowing the explosion overpressure, flame and unburnt product to be vented to the atmosphere. On principle, explosion venting cannot be used indoors. To overcome this, flameless venting can be used (Q‑Box, Q‑Rhor), which prevents flame and dust from discharging outside the protected equipment. This solution can therefore be used in enclosed spaces.

BT-ODV(U), BT and BT-VSI Triple-Section Bursting Discs

BT-ODV(U), BT and BT-VSI Triple-Section Bursting Discs

Applications: protection against excessive pressure and vacuum increase through explosion relief
 

BT-ODV(U), BT and BT-VSI Triple-Section Bursting Discs »
EDP Single-Layer Explosion Relief Panel

EDP Single-Layer Explosion Relief Panel

Applications: protection of vessels and equipment from explosion effects (silos, cyclones, filters), can be installed on systems with minor working pressure fluctuations, suitable for pharmaceutical, food and sterile applications, SIP/CIP…
 

EDP Single-Layer Explosion Relief Panel »
EX-GO-VENT (EGV) Single-Layer Burst Panel

EX-GO-VENT (EGV) Single-Layer Burst Panel

Applications: protection of various types of vessels from explosion effects through explosion relief, silos, cyclones, filters, etc.
 

EX-GO-VENT (EGV) Single-Layer Burst Panel »
ERO Single-Layer Burst Panel

ERO Single-Layer Burst Panel

Applications: protection against overpressure and dynamic explosion pressure rise by explosion relief, suitable for sanitary, food, pharmaceutical and other sterile applications.
 

ERO Single-Layer Burst Panel »
SK and BIRD Burst Indicators

SK and BIRD Burst Indicators

Applications: detection of relief discs/panels being actuated, suitable for installation in explosion hazard zone 0 (provided that monitoring systems and limit switches are used).
 

SK and BIRD Burst Indicators »
Bezpłomieniowe urządzenie odciążające wybuch typ Q-ROHR-3

Q-ROHR-3 Flameless Venting System

Applications: flameless explosion venting (safe for nearby equipment and personnel), protection of indoor/outdoor process equipment in areas where personnel may be present, silos, filters, etc., suitable for sterile applications.
 

Q-ROHR-3 Flameless Venting System »
Q-BOX Flame-reduced Venting System

Q-BOX Flame-reduced Venting System

Applications: flameless explosion venting (safe for nearby equipment and personnel), protection of indoor/outdoor process equipment in areas where personnel may be present, silos, filters, etc.
 

Q-BOX Flame-reduced Venting System »
TT-Uni-K Circular Air Cushion Explosion Door

TT-Uni-K Circular Air Cushion Explosion Door

Applications: protection of containers and silos from damage due to explosion through controlled venting of explosions to the atmosphere, automatic closing of the door once the explosion pressure has been…
 

TT-Uni-K Circular Air Cushion Explosion Door »
RLE-S Rectangular Air Cushion Explosion Door

RLE-S Rectangular Air Cushion Explosion Door

Applications: protection of filters, electrostatic precipitators and dryers from explosion damage through the controlled venting of explosion effects to the atmosphere, automatic closing of the door once the explosion pressure…
 

RLE-S Rectangular Air Cushion Explosion Door »

Explosion Isolation

Explosion isolation (a.k.a. explosion decoupling) is an indispensable element of any explosion protection system. The purpose of an explosion isolation system is to prevent an explosion pressure wave and a flame or only a flame from propagating via connecting pipes or ducts into other parts of apparatus and plant areas or an unsafe explosion discharge into the workplace.

HRD-E, HRD Piston Fire and HRD Firewolf Suppressant Containers
HRD-E, HRD Piston Fire and HRD Firewolf Suppressant Containers

HRD-E, HRD Piston Fire and HRD Firewolf Suppressant Containers

Applications: protection of silos, filters, cyclones, mixers, dryers, granulators, etc., where flammable materials are present in explosive concentrations, HRD cylinders are used across every industry for the protection of any tanks,…
 

HRD-E, HRD Piston Fire and HRD Firewolf Suppressant Containers »
VENTEX ESI-E /-D /-C Isolation Valves

VENTEX ESI-E /-D /-C Isolation Valves

Applications: protection of mills, filters, separators, driers, cyclic granulators, etc. Used in the process treatment of ST1 and ST2 class dusts, gases and hybrid mixtures, for installation on ducts connected…
 

VENTEX ESI-E /-D /-C Isolation Valves »
Speed WEY HSI Slide Valve

Speed WEY HSI Slide Valve

Applications: protection of mills, silos, filters, separators, driers, mixers, etc.; suitable for process treatment of flammable and explosive dusts (ST1 and ST2 class) and hybrid mixtures, suitable for installation on…
 

Speed WEY HSI Slide Valve »
ExKop Explosion Isolation and Venting System

ExKop Explosion Isolation and Venting System

Applications: protection of filters, mixers, cyclones, mills, dryers and other process equipment as well as preventing the transfer of explosion effects to the rest of the plant area or equipment.
 

ExKop Explosion Isolation and Venting System »
Q-Flap Non-Return Explosion Valve (self-monitoring capability available as an option)

Q-Flap Non-Return Explosion Valve (self-monitoring capability available as an option)

Applications: grinding plants, wood processing, paint manufacturers, chemical and pharmaceutical, processes: drying, granulation, grinding, dust extraction.
 

Q-Flap Non-Return Explosion Valve (self-monitoring capability available as an option) »
Explosion Venting On Ducts and Pipelines – STT Type Diverter

Explosion Venting On Ducts and Pipelines – STT Type Diverter

Applications: protection against propagation of explosion from processing equipment (e.g. mills) to silos, filters or electrostatic precipitators by controlled venting of explosion effects to the atmosphere (explosion isolation) and/or, protection…
 

Explosion Venting On Ducts and Pipelines – STT Type Diverter »
Explosion Isolating Rotary Valve
Explosion Isolating Rotary Valve

Explosion Isolating Rotary Valve

Applications: certified for application in explosion hazard areas, the valve can be mounted on the outlet of filters, cyclones, silos, conveyors and other process equipment, suitable for dosing and direct…
 

Explosion Isolating Rotary Valve »
W-DS Pressure Sluices

W-DS Pressure Sluices

Applications: A double butterfly valve and a chamber system for difference-free feeding or exhaust of bulk materials  to or from high or low pressure areas. Also suitable for abrasive materials.…
 

W-DS Pressure Sluices »
Special purpose grounding clamps

Special purpose grounding clamps

Applications: FIBC clamp Specially designed to provide a positive connection to type C big bags or static dissipative liners, without damaging their material. C type clamps Three sizes of "C"…
 

Special purpose grounding clamps »
Static discharge reels
Static discharge reels

Static discharge reels

Applications: Cenelectrex static discharge reels are available in many size/length options, have a self retracting cable drum and instant lock mechanism to prevent cable becoming tangled. They are usually fitted…
 

Static discharge reels »
Grounding and Bonding Cables in Hytrel Casing

Grounding and Bonding Cables in Hytrel Casing

Applications: Designed to combine low electrical resistance with high mechanical strength, special grounding and bonding cables are available in a range of length from 1 to 15 meters. A hytrel…
 

Grounding and Bonding Cables in Hytrel Casing »
Stainless Steel Medium Duty Clamp with Hytrel Spiral Cable
Stainless Steel Medium Duty Clamp with Hytrel Spiral Cable

Stainless Steel Medium Duty Clamp with Hytrel Spiral Cable

Applications: Medium duty clamp with two stainless steel contacts, suited to lighter applications such as earthing and bonding of small containers, carboys and vessels. Available in carbon steel or stainless…
 

Stainless Steel Medium Duty Clamp with Hytrel Spiral Cable »
Stainless Steel Heavy Duty Clamp With Hytrel Spiral Cable

Stainless Steel Heavy Duty Clamp With Hytrel Spiral Cable

Applications: 304 stainless steel heavy duty clamp is designed for earthing many types of containers, drums / barrels, kegs, open vessels, IBC's and mobile tankers. The clamp has twin tungsten…
 

Stainless Steel Heavy Duty Clamp With Hytrel Spiral Cable »
Bond-Rite Self Testing Static Grounding Clamps with Visual Indication

Bond-Rite Self Testing Static Grounding Clamps with Visual Indication

Applications: for bonding/earthing of portable/mobile plant equipment (drums, containers, FIBCs, tankers, etc.), plant items usually have a built-up of additional insulating layers, such as paints, resins, adhesives and other substances…
 

Bond-Rite Self Testing Static Grounding Clamps with Visual Indication »
Earth-Rite Omega Earth Monitoring System for Mobile and Fixed Equipment

Earth-Rite Omega Earth Monitoring System for Mobile and Fixed Equipment

Applications: the Earth-Rite OMEGA system enables engineers, contractors and OEMs to incorporate dedicated static earth monitoring as part of larger plant instrumentation and control systems, the Earth-Rite Omega module is…
 

Earth-Rite Omega Earth Monitoring System for Mobile and Fixed Equipment »
Earth-Rite Multipoint Static Grounding System
Earth-Rite Multipoint Static Grounding System

Earth-Rite Multipoint Static Grounding System

Applications: One Earth-Rite Multipoint unit can monitor up to 8 potentially isolated conductive components on processing machinery engaged in powder processing operations within zoned or classified areas, Applications with items…
 

Earth-Rite Multipoint Static Grounding System »
Earth-Rite FIBC Static Grounding for Type C FIBC Bags
Earth-Rite FIBC Static Grounding for Type C FIBC Bags

Earth-Rite FIBC Static Grounding for Type C FIBC Bags

Applications: monitoring the resistance of Type C FIBC bags ensuring that the conductive elements of the bag are capable of dissipating static charges in compliance with Cenelec CLC/TR: 50404.
 

Earth-Rite FIBC Static Grounding for Type C FIBC Bags »
Earth-Rite Plus - Static Ground Indicator and Interlock System for Rail Tankers, Drums, IBC's, etc.
Earth-Rite Plus - Static Ground Indicator and Interlock System for Rail Tankers, Drums, IBC's, etc.

Earth-Rite Plus – Static Ground Indicator and Interlock System for Rail Tankers, Drums, IBC’s, etc.

Applications: verification of a static ground connection on a wide range of industrial plant, including drums, IBC's, containers, rail tankers and other conductive equipment.
 

Earth-Rite Plus – Static Ground Indicator and Interlock System for Rail Tankers, Drums, IBC’s, etc. »
Earth-Rite RTR — Static Grounding Protection for Tanker Trucks
Earth-Rite RTR — Static Grounding Protection for Tanker Trucks

Earth-Rite RTR — Static Grounding Protection for Tanker Trucks

Applications: static grounding protection for tanker trucks, static grounding protection for tanks, drums and big-bugs (provided that the mode selector keyswitch is in place).
 

Earth-Rite RTR — Static Grounding Protection for Tanker Trucks »
Sole-Mate Anti-Static Footwear Test Station
Sole-Mate Anti-Static Footwear Test Station

Sole-Mate Anti-Static Footwear Test Station

Applications: Sole-Mate is an easy-to-use device designed to check the condition of static-dissipative (anti-static) footwear prior to entering a safety critical hazardous area (potentially explosive atmosphere). The Sole-Mate mat tests…
 

Sole-Mate Anti-Static Footwear Test Station »