Powtech virtual talks ATEX

Posts tagged ATEX

POWTECH virtual talks

Powtech virtual talks ATEX

POWTECH virtual talks |

The professional handling of dusts and powdery solids requires a comprehensive consideration of the task. In addition to the purely technical questions relating to feasibility and implementation, numerous boundary conditions must be taken into account.

One of them is the possible use in potentially explosive areas. The crux here is that these areas can not only be predefined from the outside, but potentially only arise through the actual conveying task or the conveyed goods themselves.

This is due to the fact that every substance which is flammable, in either a powdery or dusty form with fine particulates of less than 500 µm, also has the capability for a dust explosion.

Conventional, mechanical conveyor systems often reach their limits of use. Pneumatic vacuum conveying systems, on the other hand, can be designed without ignition sources and are therefore particularly suitable for such purposes. Both for organic compounds and for inorganic substances such as metal powders.

As an extract from the “ATEX, Explosion Protection and Powder Handling” seminars that take place several times a year, this short video gives an initial insight into this extremely complex topic.

Container emptying station

Container emptying station

Emptying powder and bulk goods from containers |

At companies that process bulk materials, the raw products are often delivered in containers. This leads to the question of how these containers can be emptied as quickly and efficiently as possible.

Container emptying station

Our container emptying station has been developed in such a way that its loading can be easily and individually adjusted.

As shown here, the container is placed on the station by forklift truck and the discharge valve is manually opend.
The container is emptied by gravity.

The bulk material is then gently introduced into the process by means of vacuum conveying.

The container docking stations can also be used for metered filling of containers.

Would you like to empty powder from containers?
Then this product may also be of interest to you -> VIAS

Would you like to learn more about the topic or do you have a specific task?
Our application experts will be happy to help you. >> Contact

#Container emptying #Weighing #Dosing # VacuumConveying #PowderHandling #VolkmannGmbH #ATEX

Resin granulate – A clean solution in the EX aera

resin granule

Clean Solution in the EX area |

The Production of care and hygiene products requires the transport and dosage of highly flammable resin granules in a mixer. Minimum ignition energy of the substance to be transported is 3 mJ (MIE 3 mJ).

In the previous procedure, drums were filled with resin and heated up in ovens; then the liquified resin was mixed with another liquid in a stirred vessel. This time-consuming and comparatively cumbersome to master process led to production bottlenecks.

The customer turned to us with its request for a safe, yet, at the same time, flexible work environment. In close consultation between the provider and the user, they agreed to design a flowing and space-saving process.

Big Bag Station

After the process conversion, the resin granulates will no longer be prepared in drums but rather in bulk bags. The material to be transported is now placed centrally and in the easily reachable material storage above two bulk bag unloading stations. Whereby the bulk bags are alternatingly unloaded and standstill times for container changes are avoided.

Two Volkmann Conweigh vacuum conveyors suck the material from here and transport it over 60 or 85 m distance and 12 m high to the stirred vessel with a conveyor capacity of 2 tons per hour.

The Conweigh systems ultimately supply 100 precisely measured grams of the transported material to the stirred vessel where it is heated and mixed with other liquids.


Now various flammable materials from the client can be safely transported with the selected system. Studies have shown that the suction lines can be almost completely emptied so that additional cleaning measures are not necessary in the case of pending material changes which contributes to the desired high flexibility in the system. The entire system is designed and made in conformity with ATEX.

The client chose the VOLKMANN solution for the new design of the process not least because of the close cooperation and competence specifically found in explosion risk prevention. The proposed solution also appeared attractive on account of the hygienic aspects and the operation and maintenance friendliness.Volkmann considers the user’s needs with knowledge and experience and therefore develops optimal results and processes.

Would you like to find out more or do you have a specific task?
Our application experts will be happy to help you. >> Contact

ATEX #BBU #Conweigh #Resin #CriticalSubstance #Granule #weighing #dosing #Mixer #StirredTank #BulkHandling #PowderHandling #VacuumConveying #VolkmannGmbH

Pneumatic vacuum conveying

Pneumatic vacuum conveying

ATEX and explosion protection for pneumatic vacuum conveying of powders and bulk materials |

In recent years, the requirements for the transportation of solids have increased significantly. Especially when used in EX areas.

Since mechanical conveying systems often reach their limits here and can represent an ignition source in various ways, the focus is on pneumatic conveyor systems.

The so-called vacuum conveying system, offers particular advantages here. The free from ignition source design and construction allows the use with dusts with very low minimum ignition energies (MIE).

A low conveying speed is achieved by the plug conveying. Based on the ignition source-free design, simple additional features also enable use in the gas EX area.

Would you like to learn more about the topic or do you have a specific task?
Our application experts will be happy to help you. >> Contact

#ExArea #EX #GasEx #MinimumIgnitionEnergy # VacuumConveying #ATEX #IgnitionSource # PlugExtraction

Conveying bagged goods with lumps

Conveying bagged goods with lumps |

Sometimes after long periods in storage, or due to the nature of the product, agglomerates can occur in bags and other storage containers. These can lead to blockages in the suction line during conveying or with negative influences in the downstream processes, because, for example, products can no longer be efficiently mixed.

For this reason the VOLKMANN lump breaker was developed. This can be mounted directly by a flange, for example under the RNT 180 (rip and tip sack loading station), and breaks down bigger agglomerates before being conveyed.

Installation under a big bag emptying station is also possible. Due to its design, the lump breaker is easy to clean and, due to our type model examination, it can also be used in dust and gas ex-zones.

The RNT180 has a buffer volume of approx. 180 liters and can be expanded to up to 400 litres, if required. In addition, the station can be used with sensors, various emptying aids or as a weighed version.

Contact our application experts for more information on the RNT180 product feed station or the lump breaker. >> Contact

#ProductCharging #Bags # RNT180 #LumpBreaker #Agglomerates #Lumps #ATEX #EX #BigBagEmptying

Metal powder recovery made easy

Metal powder recovery made easy

Metal powder recovery made easy |

The PowTReX is a vacuum, transfer, sieving and recovery system for metal powders, developed for use in the ​​additive manufacturing (AM) industry. It is used to transport metal powder from, for example, 3D printers and unpacking stations with a high and constant suction power. The extracted powder is sieved and the material with the appropriate particle size can be automatically returned to the process.

PowTReX (left) at the fair. Formnext 2019 / Frankfurt am Main

The system has a small footprint of less than 1 m² and offers a high and stable material throughput. The PowTReX is a reliable, safe and easy to use system which utilises a HEPA filter for protecting against harmful substances. Installation in an EX zone 22 is also possible because it is an ATEX-approved system with type-tested components. It is operated using a touch display and one-button operation.

You can find more information about solutions for “Additive Manufacturing” in our area >> here.

With this system, classification of all common types of metal powder and their alloys for additive manufacturing is possible (including stainless steel, aluminum, titanium, amongst others). Operation under fully inert conditions with a residual oxygen content of <1% is also possible, as is a complete closed loop solution for the inert gas recirculation.

#PowTReX #MetalPowder #Classification #AM #3Dprint #UnpackingStation #ATEX #Argon #Inert

Double big bag emptying station

Double big bag emptying station

Double big bag emptying station for limited space unloading areas |

Restricted unloading area solution: With this project a room with limited space has allowed us to develop a big bag emptying station with which two big bags can be emptied simultaneously.

The big bags are hung in harnesses and lifted using a winch. The mobile docking stations are pushed under the big bags and are equipped with devices for low-dust connection for emptying of the big bags.

With two feeding adapters per docking station, the material to be conveyed is fed into the subsequent processes via a total of four VS250 vacuum conveyors, in this case loading four mixers.

The product unloaded and conveyed is sodium bicarbonate.

Any questions?
Our application experts will be happy to help you. >> Contact

Double big bag station with winches and mobile docking stations.
Reduced height for use within limited space areas.

#Volkmann #BigBagStation #Dischargingstation #Ropewinch # VS250 #Powderhandling #Dockingstation # Dust-freeconveying # Vacuumconveying #ATEX

Volkmann Empty Sack Compactor

Volkmann emptying station for bagged goods |

  • with partly automated container feeding and dust extraction
  • optimised for the use with vacuum conveyors
  • NEW: Now also with empty sack compactor

The dust-free handling of solids is nowadays more than ever in the focus when processing bulk materials. Occupational safety and hygiene requirements must be observed, explosion protection according to ATEX must be adhered to. Volkmann solutions offer safety in the handling of bulk materials. The range of the RNT product loading stations for bagged goods was supplemented by an empty sack compactor which includes a dust free connection to the product loading station and shares its integrated dust extraction.

The emptied containers/sacks are collected in foil and mechanically compacted. Depending on the container size, the collection volume of the empty sack compactor is sufficient for ca. 40 – 100 units. The product loading station and empty sack compactor are entirely made of stainless steel and are completely manufactured in our company. We happily make custom systems. Volkmann develops imaginative solutions for the handling of various bulk materials for the chemical, pharmaceutical and food industry.

  • Vacuum conveyors: Designs according to industry, hygiene and pharmaceutical/eGMP standards
  • Product loading stations for sacks, big bags, drums, IBCs
  • Weighing and dosing systems for bulk material handling
  • Stationary and mobile lifting columns for vacuum conveyors
  • Consulting, planning and manufacturing from a single source

Just in case – UHU!

Just in case – UHU! |

There is probably hardly anyone who has never used a UHU product. The glue in the black and yellow tube has become one of the best-known brand products of our time. UHU develops and produces high-quality adhesives for children and parents, but also for do-it- yourselfers and professional applications in trades and industry. The development of ever better and safer products with an eye on future generations is a challenge and commitment in one.


Cleanliness and safety

Most the products are manufactured in the industrial premises in Germany, located right at the centre of the small town of Bühl at the foot of the Black Forest. Cleanliness and safety are hence matter of course in the production. The creation of adhesives generally calls for a variety of solids and solvents, which are combined in a mixer or batching tank. To further increase the cleanliness and safety, UHU decided to use Volkmann GmbH&#39;s INEX vacuum conveyors in 2007, and hence in favour of a sealed introduction of solids to the mixer.

What were the decisive reasons for using the INEX systems?

Volkmann had already opted for an ATEX certification of their vacuum conveyors in keeping with Directive 94/4/EC in early 2002, which generally permits them to be employed in potentially explosive, dusty atmospheres. Where potentially explosive gas atmospheres are concerned, standard vacuum conveyors are turned into a type- tested INEX system by an additional inertization using protective gas (nitrogen). This allows the safe and dust-free introduction of solids into containers that are pre-filled with solvents (zone 0). One essential element of the certified INEX vacuum conveyor system for this is the purely pneumatic control, which guarantees the reliability of the process by means of various safety queries such as &quot;enough nitrogen provided for inertization&quot;, for example. In addition, this INEX control unit can be directly installed in zone 1 or also be used in a mobile fashion on a driving carriage. Besides the safe introduction, this conveyance process also offers the additional advantage that dust and gas emissions are avoided, thus protecting the health of the workforce and ensuring that the production stays clean.

Process safety thanks to vapour barrier

Rising vapours and fumes can cause problems when mixers are filled, and are able to reduce the safety of the process. The shut-off flaps installed to separate the INEX vacuum conveyor from the mixer for introducing the solids into the process can be moistened by these rising vapours and fumes, leading to thick deposits of the solids and their getting stuck. Another frequent consequence is also that the filter inside the vacuum conveyor is moistened and becomes blocked. But the shut-off flap of the INEX system could be kept dry successfully by means of a nitrogen-operated vapour barrier which ensures uninterrupted and reliable operation.

Various installation situations on site

In grown production facilities, one will find highly varied installation situations where standard systems are often unusable. Height restrictions, oblique filler pipes and already provided system components often leave little room for new plant technologies. But given the fact that the entire engineering is performed by Volkmann in-house, and thanks to the high degree of self-production, the INEX vacuum conveyors could be successfully adapted to the various local installation situations of the mixers while also providing adequate access for operability and maintenance.

There can be many reasons for using Volkmann vacuum conveyor systems, as the UHU example illustrates. But one of the most important ones is certainly the close and partnership-based cooperation without which these various customized solutions would hardly be possible.

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