Next message: Richard P Blake: "T&T: Hot Battery"
Out my front door I can see the dry exhaust on the tugs when the engines are
cold. It takes about 20 minutes of hard work to get them hot enough before the
stacks are clean. Sometimes the ship's bridge is obscured if the wind is going
in the wrong direction. The old tugs are particularly bad as their engines are
more neglected and they have to idle a lot in ship assist.
I had a chance to visit the engine room of one of the Navy ships. Four diesels
in two engine rooms plus generators. They had dry side exhaust with what
appeared to be valves to change to underwater side exhaust. The generator
running while in port was leaving an oil slick that floated off in the
current. The ship was going in for overhaul after this port of call.
A friend's boat has twin dry stacks, in chrome and positioned just like a
truck tractor and sounds great.
Maine Doug
>>>>I build commercial boats (tugs) and all have dry exhaust. The advantages
are
many if it's a keel cooled system there is no seawater coming into the
engine so no raw water pump no heat exchangers no wet elbows thus eliminating
the
maintenance and repair associated with them.In cold climates there is no
worries of freezing and the chances of sea water getting into your engine
are
virtually eliminated. There is less chance of exhaust gas finding it's way
into
the boat and on the right boat It also looks and sounds very cool.
The disadvantages are the space required to run the associated piping and
insulation. They can also be noisy not from the discharge but the piping
itself
if that's not taken into consideration when it's designed. And then there's
sometimes a problem with soot and wet oily residue being sent out on initial
start up.
Brian Palmetto FL<<<<
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