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  • Offer Profile
  • Wiefferink has more than fifty years of experience in designing and manufacturing flexible solutions in plastic sheeting, both nationally and internationally. Quality is of vital importance.

    Wiefferink develops innovative production techniques and uses high-quality foil materials. All our products are thoroughly tested and inspected before use. To do this, we have developed our own testing facilities and quality programmes. We are KIWA and ISO 9001: 2008 certified.

     
Product Portfolio
  • AB Cover

  • Gastight cover
    Thanks to the high chemical resistance and mechanical strength of the foils, the AB Cover satisfies the highest quality standards. New cutting and welding procedures enable the covers to better absorb the biaxial forces exerted on them, and the hemispherical construction ensures low silo wall loading.
    The AB Cover is a double membrane cover, in which the outer cover is always pressurised. As a result, rain, snow and wind have little impact on it.
    The AB Cover has a huge advantage over silo roofs due to its widely variable gas storage capacity and its ability to function as a cover for a digester or secondary digester, to temporarily collect gas. Of course the AB Cover conforms to all local and European environmental legislation.

    Customisation for every situation
    Each AB Cover is customised to accommodate the client’s wishes and external factors. The cover consists of separately installed upper and lower membranes, which are manufactured from biaxial reinforced fabrics with a high-grade, chemically resistant PVC coating.
      • AB Cover

      • Maximally variable gas storage capacity
        AB Covers have an enormous gas storage capacity and are available for silos up to a diameter of approximately 40 metres. Operational pressures varying from 0 to 5 mbar and an under-pressure situation up to -1.5 mbar are no problem. Higher pressure can be accommodated on request. The tension straps and net support the upper and lower membranes against under-pressure situations and supports sulphur component flare-outs.

        Installation of the AB Cover
        The AB Cover is delivered to the building site prefabricated. The support straps (tractive force of 2500 kg and the safety and desulphurisation net (net strength of 400 kg/m2) are installed at an angle. Service openings can also be incorporated as an option. A layer of wooden beams is unnecessary, which saves a considerable amount of money.

        Maintenance and lifespan
        The AB Cover must be visually inspected at regular intervals. The glycol level and glycol freezing point must be checked in the over/under-pressure valve. Wiefferink provides a 5-year warranty for the AB Cover on material and production defects.
  • Ecobag

  • Durable, affordable and flexible
    The Ecobag is a system that Wiefferink has developed to store manure, digestate and other liquid waste flows in an odourless manner. The specially developed eco-green colour of the Ecobag means it is hardly noticeable in the landscape. The storage system is easy to install, without an architectural construction, on most ground types.
    Regulations and standards relating to spreading manure and storing manure and waste flows are becoming ever stricter. In addition, the resistance against large, conspicuous, grey manure bags around villages and cities is also growing, due to the fear of odour nuisance and landscape pollution. The Wiefferink Ecobag offers a solution to this.

    Blends into the landscape
    The Ecobag can be provided with a specially developed odour filter, which filters the gases released so that there can be no odour nuisance. In order to blend into the landscape, an eco-green colour was developed in addition to grey.
      • Ecobag

      • No building permit necessary
        No building permit is required because there is no permanent construction required. Depending on local legislation, however, it may be necessary to apply for an installation permit, though sometimes simply notifying the authorities of the installation is sufficient.

        Installation of the Ecobag
        The Ecobag is installed within an earth bank, for which no supporting structure is necessary. In most cases, the Ecobag can simply be placed on the loose ground. The groundwork must satisfy the local standards for installing a manure basin. Wiefferink supplies the drawings for dimension of the groundwork. Before installation, our experts inspect the sizing and the situation at your location, so that we can complete the installation as quickly and effectively as possible, ready to use.

        Additional options for the Ecobag include the patented odour filter and a mixer to keep the stored manure homogeneous.

        Maintenance and lifespan
        The Ecobag requires very little maintenance. Only the vent pipes and possibly the odour filters need to be checked for silting up. Wiefferink provides a 5-year warranty for the Ecobag on material and production defects. An Ecobag typically lasts 10 to 15 years.
  • Silocover

  • No CO2 emissions
    The Silocover by Wiefferink is unique. It has a very long lifespan due to the high-grade materials and innovative production technology used in its manufacture, meaning it is an extremely durable cover for your silo.
    In order to contain the emission of hazardous materials, there is a duty to cover stored manure in many European countries. The Silocover is ideal for covering silos. With one or more inspection openings, the mixers often present in the tank can also be maintained. Moreover, rainwater is kept out of a covered silo, so there is no unnecessary volume increase.

    In accordance with environmental directives
    Every EU member state is currently adjusting its regulations regarding CO2 emissions, making the use of a cover largely necessary or required. This has already been implemented in the Netherlands, Denmark, Belgium, Italy and Eastern European countries, among others. Our Silocovers satisfy both environmental legislation and construction-related directives.
      • Silocover

      • Absorbs external forces
        The Silocover is manufactured from heavy polyester fabric with a synthetic coating on both sides. As a result, it can withstand manure and other aggressive substances and protects against many years of extreme weather conditions. The Silocover is equipped with an unique system of edge pipes and tension sets, which transfer the forces from the cone to the silo circumference. It is also possible to adjust the tension later. An inspection opening provides access to the silo for maintenance. The Silocover is available in a gas-tight and a non-gas-tight version.

        KOMO certified
        Odour nuisance and the emission of hazardous substances are minimised by the Silocover. The Wiefferink Silocover has a KOMO certificate and satisfies all statutory requirements.

        Installation of the Silocover
        The Silocover is delivered ready-to-use. For every silo, the roof construction is calculated based on wind and snowfall values for your location.

        Maintenance and lifespan
        The Silocover requires very little maintenance; after a large snowfall the snow must be removed, and the Silocover must be kept at the right tension. Wiefferink provides a 5-year warranty for the Silocover on material and production defects. Silocovers typically last 15 years.
  • Flexitank

  • Safe and durable
    Wiefferink has developed the Flexitank, which can be used as a drinking water supply or to store drinking water in case of emergencies.
    The Wiefferink Flexitank can be filled and emptied via lead-throughs. The product is ideal for connection to a filter system. The Flexitank concept is used in such places as Somalia, Pakistan and South Africa in this way, mainly in locations where drinking water cannot be offered in a regular manner.

    Clean drinking water worldwide
    The Flexitank is used by Dutch and international water companies for both emergency drinking water provision and regular drinking water supply. Wiefferink Flexitanks are also used at international sporting events, such as the soccer World Cup and European Cup and London 2012. In cooperation with these companies and relief organisations, the Flexitank has been further developed and granted drinking water certification, FDA certification and UK WRAS certification. In order to supply the world’s citizens with clean drinking water, a fully-fledged, safe and durable drinking water system was created. Moreover, the Flexitank is easy to install on location and can be used immediately in case of emergency.
      • Flexitank

      • High-grade, certified materials
        The Wiefferink Flexitank is manufactured for repeated use. We use high-grade materials that are extremely strong, light and flexible. These materials are thermally and high-frequency welded with care. The production method has been recorded in ISO documentation and certified by KIWA.

        Flexitank for fuels and other liquids
        Because the Flexitank can be made of special chosen flexible foil that is impermeable to a certain liquid, it can be used to store diesel, for example, or kerosene, de-icing fluid, liquid chemicals, fire-extinguishing water or wastewater.

        Easy to transport
        The small Flexitanks are extremely easy to transport in containers, pick-ups or flatbed trailers. Empty, the product takes up just 2% of its maximum volume. The Flexitank can be set up quickly and easily and it provides optimum protection for the liquid. This efficient liquid storage can be supplied in a variety of standard volumes (5, 10, 15, 20 and 25 m3) or in a custom size, up to 1500m³, entirely according to your specifications.
  • Combibag

  • For use at a biogas installation
    The Combibag is a system that Wiefferink has developed to store manure and digestate in an odourless manner, while also providing space to capture the methane given off by the slurry. The special eco-green colour of the Combibag means it is hardly noticeable in the landscape. The storage system is easy to install on most ground types.
    The Combibag is produced with a special foil suitable for the digestion process and for capturing gas. In comparison with our Ecobag, it has more, heavier fastening points, tension straps and anchors. These are appropriate for absorbing the forces resulting from the gas pressure. The Combibag is fitted with
    an over/under-pressure valve and has a maximum gas pressure of 1.5 mbar.

    Blends into the landscape
    The Combibag captures the gases released, to prevent odour nuisance in the vicinity. In addition, the Combibag is available in grey and a special new eco-green colour to blend in with the landscape.
      • Combibag

      • No building permit
        No building permit is required, because no permanent construction is required for the Combibag. Depending on local legislation, however, it may be necessary to apply for an installation permit, though sometimes simply notifying the authorities of the installation is sufficient.

        Installation of the Combibag
        The main advantage of the Combibag is that it can be installed in almost any location, without a supporting structure. The Combibag is placed within an earth bank for side support. Wiefferink supplies the drawings for dimension of the groundwork. Before installation, our experts inspect the sizing and the situation at your location, so that we can complete the installation as quickly and effectively as possible, ready to use.

        Additional options for the Combibag include a gas pump installation, pressure measurement, heating and a mixer.

        Maintenance and lifespan
        The Combibag requires very little maintenance. It is, however, necessary to check the volume of the gas production, the intended gas removal and the operation of the over/under-pressure valve. Wiefferink provides a 5-year warranty for the Combibag on material and production defects.