CONSIDERATIONS FOR ONLINE AND OFF-LINE CLEANING OF HVAC PIPING SYSTEMS

The presence of deposits in pipes and equipment, or the appearance of leaks, is the driving force for considering a cleaning program. The ch oice between cleaning or pipe replacement, on-line or off-line cleanin g, or the selection of the specific cleaning program used, all depend upon a detailed knowledge of the systems involved. The amount of advan ce preparation, the selection of the cleaning method, the specific che mical program, and the degree of performance monitoring are all shown to critically affect the success of the program.