Due to their physical and mechanical properties (plasticity,
flexibility, high thermal conductivity, pressure resistance)
that do not change in time, copper tubes are widely applied: -
water supply installations, - gas and heating systems, - fire
protection systems, - cooling facilities and appliances, -
various branches of industry (shipbuilding, production of
machinery, chemical and food industry). Water limestone cannot
deposit (incrustation) on the inner walls of copper tubes. When
water passes through new copper tubes, a permanent protective
layer is formed on the inner wall surface (in thickness of
several tenths of a millimeter), which ensures their free use
for potable water supply installations. Moreover, the above-
mentioned permanent protective layer prevents erosion of the
inner wall surface. Copper tubes in water supply systems endure
more full water frosting-defrosting cycles (without losing their
properties), that is, hard copper tubes can be frosted-defrosted
twice without any damage, while sof