On Jul 15, 2:06*pm, harry wrote:

If a fuseable plug is in good order and fails,normally it will put the
fire out.
They are designed to do just that.

Rubbish, but then it's an AOL poster.

They can get blocked and this may not be seen if they are not removed
and examined as they should be annually.

According to several operating practices (depending on whether you're
boat or rail, US or UK) they're inspected monthly and may be
_replaced_ every six months (depending on the number of days in steam).