Cleaning and Passivating Newly Installed Heating and Cooling Systems

Every new water system is different. Even two identically manufactured boilers are different in some regard. It is imperative to the future operational success of your new HVAC equipment that they are properly cleaned and passivated before their initial start up. The American Society of Mechanical Engineers maintain guidelines for the chemical cleaning and passivation of the internal metal surfaces of new boilers, chillers, and pipe work. In fact, if your newly installed piping and equipment is not properly cleaned and passivated, you can almost guarantee future problems.

Here’s why:

  • Chemical cleaning removes harmful residue that collects on the inside of your new pipe and equipment such as mill oil, rust and welding slag. When administered properly, a chemical cleaning helps to gently wash away these deposits from the interior of the pipe, tubes and other interior metal surfaces.
  •  Failure to remove these deposits will almost certainly result in the pitting and future corrosion of these surfaces. This can lead to faster pipe decay, tube failure, and in some cases, can instigate microbiological under deposit corrosion.
  •  The chemical cleaning process is immediately followed by a passivation of the metal surfaces. The passivation process will help to further protect the internal metal surfaces of your newly installed equipment. The cleaning and passivation chemicals are determined by the scope of your project and the actual types of metals that need to be cleaned and protected. There is no such thing as a “one drum” solution that address all clean out needs. Your Clarity Representative can help you determine the required chemicals and the proper holding times for your project. We will also be on-site to administer the chemicals at the appropriate times.

Tips for success:

  •  Let us know the manufactures and model numbers for equipment being cleaned.
  •  Inform us if your project includes old pipe and new equipment, or new pipe going into old equipment. It will influence the course of action needed to successfully clean and passivate your equipment.