Repair and spray lining of storage tank bund system at gas terminal

The solution

Due to the nature of the contents of the tanks, Adler and Allan sought specialist advice when deciding on the lining material. The polyurea lining system, HT100FB, was selected by our consultants as the most suitable material. Perenco also carried out their own independent investigations of the suitability of HT100FB, looking into a range of processes including cleaning, prepping, overbanding and priming. Once the lining had been given the go-ahead, Adler and Allan teams set to work installing HT100FB in each bund over a series of programmed works. Initial preparation included cleaning, prepping, replacement of the construction and movement joints, and remedial concrete repairs. Backing rods were inserted where needed, covered with EPL9, primed and gritted for overbanding. On one of the tanks, bleach had to be flushed off the bund using a jet washer. Before the spray lining was applied, all equipment was masked off to protect it from any overspray. Adler and Allan teams also had to overcome certain obstructions in order to get the spray lining on effectively: there were pipes in the way, cable trays had to be removed from flank walls, and heights had to be adjusted to make way for the equipment. All Adler and Allan equipment taken on to site was ATEX rated, from personal protective equipment through to batteries and power tools. The spray trailer was modified to comply with site safety rules by fitting a Chalwyn Valve and Spark Arrestor to stop any ignition sources. An ATEX rated Spray Rig was purchased for the contract, which will also enable Adler and Allan to undertake similar works at hazardous environments. Additional safety measures included adopting a sign-in and out system to ensure all workers were accounted for at all times.