HOU Scale Remover™ (ETI-980) is made from a blend of chemicals that form soluble, complex molecules with iron ions. ETI-980 was specifically developed to react with iron sulfide (FeS) in the troilite form (present in packing or demisters; usually adopt hexagonal symmetry) and the mackinawite form (present in trays or walls, with a layered structure), which means ETI-980 will dissolve most of the scale found in a refinery.

HOU Scale Remover™ (ETI-980) is used mainly in EnvTech Liquid Phase/Mix phase cleaning performed in very complex Distillations/Fractionations towers where the presence of pyrophoric and scales is expected.

In typical applications, EnvTech provides external pumps, most vessels and exchangers are liquid-filled except for large columns such as the Main Fractionators or Vacuum Towers, which are cascaded.

The solution is heated to a temperature range of 180°F to 200°F using process unit reboilers, furnaces, and/or direct steam injection.

The goal is to provide adequate flow through the entire system while minimizing the number of temporary connections and blinding required prior to the start of the cleaning.

This system is suitable for both packed / tray-type towers. It has proved equally successful in both applications