To function efficiently, every tube type heat exchange device, whether a boiler, condenser, or an exchanger heating or cooling a liquid or gas, requires that the surface of the tubes be clean and scale-free.
The formation of mud or scale deposits on the transfer surfaces of tubes can drastically reduce the flow of heat through the tube walls. The fact is that all scale formations are insulators and therefore their presence on heat exchangers cannot be tolerated. Quite often, these fouling agents that cause scale also have chemical characteristics that are highly corrosive to the tube material.
Quite simply, cleaning tubes increases energy efficiency. While there are a variety of cleaning methods available, when faced with hundreds or thousands of tubes to be cleaned, the use of metal scrapers fired hydraulically through the tubes is a well proven method of quickly and effectively removing scale deposits.