The cleanable filter system for highest demands
The cleanable filter system
With the HETdynamic HEPA filter system, we offer an advanced solution that is specifically designed to meet the requirements of modern industries. It is ideal for environments where dust concentrations of 5 mg/m³ or more can occur. The HETdynamic is characterized by an internal HEPA filter cell, which plays a key role in the efficiency and economy of the system. This filter cell has an automatic regeneration system that is activated as soon as the dust load exceeds a certain threshold value. This self-cleaning function not only ensures a longer service life for the filter, but also significantly reduces the need for maintenance work and filter changes.
The HETdynamic is designed to work continuously – it can operate without interruption 24 hours a day, 7 days a week, 365 days a year. This reliability makes it an optimal choice for industries that require uninterrupted air purification.
Another feature of the HETdynamic is the efficient use of the filter surface. Automatic regeneration after each extraction process allows the system to clean the same volume flow with a significantly reduced filter area, increasing efficiency and reducing operating costs at the same time. These features make the HETdynamic an ideal choice for demanding applications where a powerful HEPA filter system is required to ensure a clean and safe working environment.
HETdynamic
Advantages
- Safe containment up to OEB 6
- Double HEPA filtration
- Highest explosion protection
- Cleaning system for backwashing the primary filter by means of cleaning cylinder
- Continuous and discontinuous operation
- Plant in dust-tight or gas-tight design
- DEHS measuring points for qualification of the safety filter stage
- GMP-compliant design
Features
Leak test
Dust-tightness: Due to the closed design and operation under negative pressure, it is ensured that no dust particles can leave the filter housing.
Gas tightness: A defined leakage of <1% of the housing volume is guaranteed within 6 minutes, based on a test pressure of 2,000 Pa.
Tightness tested
Highest containment level due to safe filter replacement
Circumferential double groove profiles on the filter openings for filter change using Safe Change technology. (bag-in-bag-out)
The filter bags are designed as foil bags made of polyethylene with gridded black strips consisting of polyethylene and carbon powder. This gives the filter bag dissipative properties and makes it suitable for combustible dusts and gases.
In addition, the foil bag is provided with welded-in side pockets to facilitate handling during filter change and to shorten the process time.
The rubber rings for fastening the bag in the double groove profile are designed as hollow cord rings, which ensures that the bag sits firmly and securely in the groove profile of the change frame. A tab on the rubber ring ensures easier handling during filter change.
Highest containment level due to safe filter replacement
Highest explosion protection
Ex100
The filter system is electrically conductive and does not generate its own ignition sources.
Ex200
Due to its explosion pressure shock resistant design, the filter system offers constructive explosion protection based on the principle of partial filling. The explosion pressure is relieved internally via the filter cells, which also serve as an effective flame arrester.
Dusts with a specific pmax of 10 bar can be handled, as the pressure surge is reduced internally to 1 bar. Due to this internal pressure relief, the system does not suffer any permanent damage even in the event of an explosion.
The offered filter unit is designed according to ATEX Directive 2014/34/EU and approved and certified by FSA Mannheim, notified body 0558.
In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.
From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.
After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.
In the event of an explosion, no permanent deformation occurs according to the explosion test, even with dusts up to a Kst value of 590 bar*m/s.
From a Kst value of 300 bar*m/s, a blocking slide valve for the primary filter cell and a flap monitoring system must be provided for this purpose.
After internal cleaning, filter replacement and functional testing, the filter system can continue to be operated without any further measures.
Special Features:
- In the event of a dust explosion, the filter housing is not damaged
- The special arrangement of the filter cells acts as an effective flame arrester to prevent ignition on the clean gas side
- Explosion pressure and heat are dissipated via the filter cells.
No external pressure relief or explosion suppression measures are required, which is a huge cost advantage.
Highest explosion protection
| Technische Information | |
|---|---|
| Filterklasse | H13/H14 nach DIN EN 1822 |
| Volumenstrom | ab 200 m³/h |
| Betriebsmodus | kontinuierlich/diskontinuierlich |
| Rohgasstaubbeladung | 5 – 4.500 mg/m³ |
| Reingasstaubgehalt | < 0,0001 mg/m³ |
| Druckverlust der Anlage | 300 – 2.500 Pa |
| Gehäuseausführung | Stahlblech, Edelstahlblech |
Options
GMP compliant construction
The system housing is designed to be GMP-compliant. Protrusions and undercuts were avoided where technically feasible.
Raw gas hoppers, dust discharge and maintenance doors are enclosed, providing easy-to-clean surfaces. Furthermore, the back of the plant with raw gas duct and WIP system is also clad.
Secure and comfortable closure system
HET clamp 100
Sealing Tool
Basic version of the pincer system for safe separation of Safe Change bags. (cable tie)
HET clamp 200
Sealing Tool
For safe OEB4 operation, the HETclamp200 closure system is required and used for filter and dust discharge changes.
Two special pliers, for sealing as well as for cutting off the special clamps, ensure a secure and dust-free sealing of the Safe Change bags.
Wash in Place
WIP allows cleaning without dismantling the device. This provides a high level of protection for operators and maintenance personnel from contact with hazardous materials. And through a strict formulation of cleaners, pressures, temperatures and intervals, a precisely repeatable cleaning process has been developed.
Restricted Access Barrier Systems
The requirements for RABS systems are precisely defined by the ISPE (International Society for Pharmaceutical Engineering). These include barriers that reliably shield personnel from direct contact in critical zones.
For example, we use glove ports in our plants. And in the rare cases where highly automated processes and well-defined safety procedures require so-called open-door interventions, we make sure that best practices are taken into account.
Filter qualification
The filter system is equipped with DEHS lances for qualifying the separation efficiency of the first and second filter stages:
- Test medium application in the raw gas channel
- Measuring lance for raw gas concentration determination in the hopper
- Measuring lances (3 pieces) after the primary filter stage for qualification
- Ring line for uniform feeding of the raw gas concentration upstream of the secondary filter stage
- Measuring lance for raw gas concentration determination
- Measuring lances (5 pieces) after the safety filter stage for qualification
The secondary filter stage is designed with the so-called tightness test. A test overpressure is applied to the test groove covered by the filter seal. The correct seating of the filter cell is validated by measuring the leakage flow (<16 l/h).
Easy and safe filter change due to perfect storage possibility of the filter
Filter change - simple and safe. The HETdesk is the ideal solution for easy and safe filter change. It is mounted directly on the open maintenance door, the filter cell can be conveniently removed and pulled onto the HETdesk. As a perfect intermediate storage system, it provides additional safety when disconnecting and stowing the dust-laden filter cell during a filter change.
The advantages:
- Easy and safe filter change due to perfect storage possibility of the filter
- Suitable for all HET HEPA filter systems with 610 x 610 x 292 mm filters
- Manufactured in stainless steel, ideal for GMP applications
- Small footprint and easy to store
- No additional accessories necessary
Qualified DEHS measurement
HETperformance stands for various options for checking the filter system in terms of design, functionality and safety.
These criteria are also important in the pharmaceutical industry:
- Is the plant and its components built safely?
- Can it be used in explosive atmospheres?
- Is the plant tight?
- Can it be used in clean rooms?
- Do any hazards emanate from the plant?
- Can it be used under containment conditions?
- Does the system serve its purpose?
- Can it filter the hazardous substances out of the air reliably and efficiently?
At the core of HETperformance are measurements and validations of the filter system for both optimization and protection of employees and the environment.
Technologies
Filtration
Containment
Explosion protection
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