Should the plug melt out, it is necessary to replace it at once, or as
soon as the heat will permit you to do so. It might be a saving of time
to have an extra plug always ready, then all you have to do is to remove
the melted one by unscrewing it from the crown sheet and screwing the
extra one in. But if you have no extra plug you must remove the first
one and refill it with babbitt. You can do this by filling one end of
the plug with wet clay and pouring the metal into the other end, and
then pounding it down smooth to prevent any leaking. This done, you can
screw the plug back into its place.
If you should have two plugs, as soon as you have melted out one replace
it with the new one, and refill the other at your earliest convenience.
By the time you have replaced a fusible plug a few times in a hot boiler
you will conclude it is better to keep water over your crown sheet.
LEAKY FLUES
What makes flues leak? I asked this question once, and the answer was
that the flues were not large enough to fill up the hole in flue sheet.
This struck me as being funny at first, but on second thought I
concluded it was about correct.
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