> My limited grasp of locomotive technology suggests that an injector
> is a device to force feed water into a boiler against boiler
> pressure.
Correct - because it is so inefficient it's a useful way of using up
surplus steam e.g. on a loco running downhill or on a boat when
approaching a lock.
So can one of you [this means Sean, I expect...] please
> explain how the crew of Emily Jane could 'manually put water into the
> boiler'?
EJ is condensing, so normally they use an engine-driven pump to feed the
boiler (as do I, though I run non-condensing). I think they have the
same basic set-up as I do:-
engine driven ram pump (most efficient, and used on long pounds)
small injector (used e.g. when passing lines of moored boats)
large injector (used e.g. when a slow lock is anticipated)
hand pump (in my case with a 2" x 6" ram and 4' handle - used when all
else fails or when the boiler is cold). The last time I had to use it
against boiler pressure was going to Hawkesbury when the duckweed was
rampant and blocked the inlet sufficiently that none of the other three
would work. Excellent exercise and proof that panic is a great
motivator! When I opened the filter at Hawkesbury lock it was completely
jammed with duckweed.
I can't say I am completely relaxed in a steamboat without a handpump -
for example PRESIDENT doesn't have one, relying on a big injector and a
Worthington. There comes a point when no amount of panic will do you any
good - JEREMIAH O'BRIEN relies on two independent feed-pumps and an
engine-driven air pump. A lever off the air-pump drives the ship's
washing-machine, which has a notice:-
2500HP WASHING MACHINE. NOT SUITABLE FOR DELICATE LINGERIE.
>
> Baz
>
Sean
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