Frequently Asked Questions (FAQ)
Our tanks serve primarily for the storage of non-inflammable, hazardous liquids. These are mostly acids and alkalines, as hydrochloric acid, sulphuric acid, acetic acid, formic acid, caustic soda, potash lye, diluted ammonia, hydrogene peroxide and similar media. The Deutsche Institut fuer Bautechnik (DIBt) Berlin, has issued a media data sheet valid for tanks having a note of approval. Out tanks are not appropriated for the storage of inflammable, explosive or nuclear media.
Our approved storage tanks are vertical, cylindrical flat-bottom tanks. Processing tanks which are not subject to the note of approval are available with conical and tapered bottoms. Further we are producing tanks in rectangular construction, facultatively equipped with jacket steel profiles. We do not produce horizontally lying tanks.
Our storage tanks of PE (with note of approval) are allowed to be placed inside of buildings as well as outside. When the tank is placed outside it has usually a conical roof. Tanks of PP should not be placed outside.
Storage tanks used for the storage that means the provision of hazardous liquids must have a note of approval. Processing tanks as blending or mixing tanks are not subject to have a note of approval.
Storage tanks according to our note of Approval Z-40.21-10 do not need an additional static calculation because this was already done by us when issuing the application for the note of approval. Special constructions and tanks according our note of approvals Z-40.21-120 and Z-40.21-221 may need an additional static calculation depending on the individual legislation of the federal country concerned.
According to the conditions of the German Water Resources Law (WHG) plants handling hazardous liquids must be equipped with a retention system.
Out tanks made of HDPE may be laid out for a maximum constant operating temperature of 50 °C (122 °F), tanks made of PP may be calculated for 80 °C (175 °F). When liquid chemicals are stored indoors or outdoors, a constant operating temperature of 20 °C (68 °F) will be sufficient. The individual static calculations are laid out considering increase in temperature caused by sun rays.
Normally our tanks are designed for non-pressurized storage, that means the storage of liquids under atmospheric conditions. Beside the filling pressure of the liquid (hydrostatic pressure) an overpressure of + 5 mbar and an underpressure of -3 mbar is being considered.
Our tanks according to the note of approval are laid out for a lifetime of 25 years. When storing normal media (as e.g. hydrochloric acid, caustic soda) we know from experience that this lifetime will be reached when operating the tank properly. In case of critical media ( as e.g. nitric acid 55 %, sulphuric acid 96 %) the lifetime will probably shorter.
Our tanks destined for being placed outside are laid out to withstand the probable wind and snow loads according to DIN 1055-4 and DIN1055-5. Tanks which are placed in the open must have a conical roof.
If our tanks are to be placed in a seismic area according to DIN 4149, so there it might be necessary to have more solid tank construction and an additional static calculation. Normally the placement of a tank in a seismic area is possible, as far as this fact will be taken into account when planning the tank.
No our tanks are laid out for the above ground placement on a foundation plate. When our tanks would be installed into the ground there will arise supplementary forces caused by earth pressure for which our tanks are not calculated.
Our helically wound tanks may be produced with an inliner of non-pigmented HDPE. For these materials we could provide a certificate of the FDA (Food and Drug Administration).
Yes, our tanks may be repaired or revamped by welding of PEHD or PP. This is not easily possible with tanks of GRP or cross-linked PE.
Yes, our tanks are efficiently protected against the impact by UV-rays from sunlight. This protection results from a pigmentation of soot added to the thermoplastics which provides the black color of our tanks.
Gas scrubbing is necessary when storing gassing media. The exhaust air of those media may cause bad odors ( e.g. formic acid, acetic acid, diluted ammonia), extremely corrosive (for example hydrochloric acid, nitric acid) or even poisonous (hydrofluoric acid, hydrogene peroxide) and has to be scrubbed professionally before being led into the atmosphere.