92214's boiler performance and longevity will be dependant on the maintenance and care that it receives. For example, 

• Impurities in the water supply will cause scale build-up on the firetubes, which will reduce heat transfer from the fire to the boiler.  To reduce this to the minimum, measured amounts of water treatment additive will be added to the tender tank whenever water is added.  In addition, the water outlet from the tender tank to the injectors is via sieve boxes to catch any large water-borne particles. there are further water sieves in the injector water valves.

• A build up of soot on the small tubes and flues will reduce heat transfer to the water in the boiler. This can be tackled by 'sweeping' the tubes with a rod or using the steam lance.

• A build up of sludge around the foundation ring will cause rivet problems due to uneven heat transfer. To combat this, the boiler will be regularly 'rodded' and washed out when it is 'out of steam'. Access to the water space in the firebox and boiler is via the 'washout plugs' and 'mudhole doors'. The blowdown valve will also be used to get rid of sludge and salts in the water when the loco is 'in steam' and on shed.

• Raising the temperature of the boiler too quickly will cause stay and tube leaks. To minimise this the fire will be lit a least 1 day before the loco is required, allowing the whole of the firebox and boiler to warm up slowly and evenly.

Some of the ways of making access to the boiler/firebox are shown below:-

Bottom photo:  washout plug in place on top edge of firebox. 

Bottom photo: mudhole door position at the bottom front end of the firebox (fireman's side).  Some of the stays between the inner and outer firebox wrappers can be seen. The item in the lower right of the photo is part of the blowdown valve.