Vertical flat-bottomed tanks

NEN-EN14015 | Vertical flat-bottomed tanks

The NEN-EN14015 is the European standard for the design and manufacture of vertical, cylindrical, above-ground, welded steel tanks with flat bottoms. Tanks usually designed for the storage of liquids at ambient temperature and higher. This norm dictates tank design, manufacture, welding, inspection and installation requirements. NEN-EN14015 vertical flat-bottomed tanks are designed in order to withstand low internal pressures. Especially important for the storage of typical products such as crude oil, petrol, chemicals and water. If your installation has to satisfy the PGS 29 directive, newly-built tanks must comply with EN14015.

XL Tanks constructed according NEN-EN14015

Gpi has extensive experience in the production of EN 14015 tanks. Varying from tanks built in the factory up to +/- 500m3, to tanks built on-location up to +/-15,000 m3. Depending on the desired design and required conditions these tanks are equipped with a conical roof or a doomed roof. With or without anchors and stiffening rings, such as wind girders and/or a top corner ring. Naturally, these tanks can be provided with a spiral staircase, a cage ladder or a stairway. In terms of material, a form of duplex is often chosen. Due to this material being stronger than normal austenitic stainless steel variants, thin walls can be employed. Which ensure for a more rapid, higher quality and affordable tank.

stainless steel storage tanks

Although EN14015 is primarily intended for tanks built on-site, we also produce tanks in compliance with EN14015 at the factory. For site construction we use unique and efficient construction methods. Depending on the number of tanks and location and customer needs we use the most suitable and smart construction method. Or a combination of them. Therefore achieving the highest quality and fast turnaround times. When building on-site is not possible we produce tanks partly or ready-to-use in our factories in the Netherlands and Poland. Subsequently we take care of transport to the location.

Multiple tanks

For larger series of storage tanks, we usually run construction methods in parallel. Want to know how? Watch our Coil Building film.
We also produce tanks according to API 650, the American counterpart to EN14015.


  • The European standard for above-ground flat-bottomed tanks
  • Wind / Earthquake loads included
  • Test & Inspections included
  • Up to 15,000m3


  • Conical/ Domed / Removable roof
  • Double bottom / Cone up/down
  • Top corner ring/ Wind girders

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