Page 322 - Corrosion Engineering Principles and Practice

292 C h a p t e r 8 C o r r o s i o n b y W a t e r 293

Thermal Conductivity
Alloy (W m K )
-1
-1
Admiralty metal 111
Aluminum brass 100
Aluminum bronze 79.5
90/10 Cu/Ni 44.9
70/30 Cu/Ni 29.4
S30400 15.0
N08367 11.0
S44735 17.0
S44660 17.0
Commercially pure titanium 21.6
TABLE 8.9 Thermal Conductivity of Various Alloys Used in Heat Exchangers

Sediment or debris can cause underdeposit corrosion or turbulence
that can damage or remove the protective film, particularly on the
less resistant copper-based alloys. Effective screening or filtering can
limit this problem. Copper alloys are, in general, better at resisting
the attachment of organisms than stainless steels or nickel alloys.

Water side film
Steam side water
film

Steam side
fouling
Tube wall

Water side fouling

FIGURE 8.15 Breakdown of the components making up the resistance to
heat transfer in a heat exchanger tube.