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Installation and Maintenance Manual form 185
8.0 STRAY-CURRENT CORROSION
Since Fernstrum’s involvement in the design of any particular
marine vessel is limited to the heat transfer requirements of
the vessel, grounding or bonding of the keel cooler is best
left to the person responsible for the design of the corrosion
protection system. If the customer needs guidance on this
issue it is suggested to isolate the cooler from the hull and
monitor closely the condition of the cooler, anodes and
surrounding hull area for the first few months. This is for the
simple fact that it is easier to ground a cooler after installation
than it is to isolate it.
When welding is taking place on the hull while in the water,
steps should be taken to monitor the keel cooler for any
possible stray current corrosion. For guidance on proper
welding equipment connections for waterborne vessels,
we suggest consulting either NAVSEA S9086-CH-STM-010/
CH-074R4 Welding and Allied Processes, Naval Ships’
Technical Manual Chapter 74 - Volume 1, or ANSI/AWS
D3.5:1993(R2000) Guide for Steel Hull Welding, Section 6
Stray Current Protection. Note that the Section 6 of the ANSI/
AWS D3.5:1993 standard comes directly from the document
provided by NAVSEA.
If an impressed current system is used, it is best to consult
the manufacturer of the system for their recommendations
as to grounding or bonding of equipment mounted to the
hull.
The product warranty is not aected by how the keel cooler
is configured into the corrosion protection system, as it
covers defects in material and workmanship, not failure due
to galvanic or stray current corrosion.
The best plan of action is to have a corrosion engineer
evaluate the corrosion protection scheme of the vessel and
verify its proper function.
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