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