Double Wall System (RDP)

Application in situ. No need for projects, permits or building works.

The procedure developed by Rafibra consists of manufacturing a double wall tank inside an old tank, with a permanent leak detection solution, transforming a single wall tank into a double wall one.

This tank is designed to prevent leaks and, therefore, subsoil contamination thanks to its monitored interstitial chamber among other components.

A leak detection system is installed which informs and emits a visible and/or audible signal in the event of entry/leak of fluid in the interstitial chamber, constituting a permanent control and protection system of the tank.

It can be installed in any type of new/old, underground/above ground tank whether it is made of fibre or steel, thanks to our environmentally friendly resin and tissues that stick to any surface.

The 3 main qualities that a lining should have are:

  1. The adherence (grip) of the material to the tank.
  2. Its chemical resistance (the petrol doesn’t attack it)
  3. Its mechanical resistance, managing to remove any cracks, pores or bubbles in the tank and reinforcing the structural strength of the tank.

Double-walled fuel tanks

Double Wall System Installation

Installation of the permanent and automatic leak detection system on the detection chamber

Once the double containment system is built, the permanent leak detection system will be built on the detection chamber, authorised and approved in accordance with the European standard EN-UNE 13160 according to the construction type which could be:

  • By vacuum or pressure.
  • By liquid. The liquid in the detection chamber will be in accordance with the standard UNE 62350 – 4 : 1999 of a type which is non-toxic. An anti-freeze is recommended (as a minimum up to –20 ºC). It will have antibacterial additives and will be biodegradable and coloured to make the refilling of the interstitial chamber visible.


  • Real-time images on any system in the world.
  • Customer service via web platform.
  • Connection to own data network

Characteristics of the service