The heart of every marine air conditioner is the condenser—the heat sink to the ocean and the only component the corrosive sea water touches is the inside of the inside tube. Failure of this tube is catastrophic for the entire system. Even extremely corrosive places like the very high salinity of the Red Sea are no problem for Flagship Marine condensers because we use an unusually thick-walled 90/10 CuNi (copper-nickel) tube with particular annealment, hardness, and other characteristics.
We don’t dramatically shorten our condensers to save money by enhancing this tub: knurling or rifling for example. Our tube is “slick walled” with no thin spots that fester these failures.
Paper-thin condenser tubes dissipate heat very quickly so the condenser tube can be short and inexpensive. We don't cut corners by doing so. We have full-length condensers! The shorter the condenser, the cheaper it is and the shorter it will last!
Flagship Marine has always prioritized durability and quality over cost savings and we NEVER cut corners. We also don’t skimp on our brazing material—ALL refrigerant lines are brazed with a 15% silver alloy, not the 5% typical of other manufacturers. As a result, Flagship Marine is very proud to have had almost ZERO condenser failures in the last two decades.
It has been known for a long time that titanium is an unsuitable material for seawater condensers because of marine growth. Indeed this extensive US Navy study details the problems.
One way to minimize marine growth with titanium is by having high-velocity seawater flow 100% of the time. Dormant water equals marine growth.
Recently some manufacturers have been mixing titanium with copper to control the marine growth, so you really have a titanium/copper tube, which is a very special alloy that is so new we don't know the "unforeseen consequences" of using this product.
We have never had a problem with our extremely rugged, slick tubed, thick-walled 90/10 condensers, and after so many years of basically zero failures, we don't want to experiment with unproven materials. Severe electrolysis is about the only thing that will damage our condensers.