Cynic wrote:
I only had two blast tube replacement jobs ever. One was in an industrial
boiler where a lip ring had burned away due to build up of carbon which
had not been removed at service. The other was physical damage by a
clumsy amateur.

Interesting

What does a regular annual service look like?
Filter? Nozzle?
Or are those things changed on an as-needed basis?
Or a time-based schedule (a bit like x,000 miles on a car)

Theo