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5637 STEAM
LOCOMOTIVE GROUP

 
 

FIREBOX

 
                 
 


The Firebox

It was noticeably cheaper if a lot of work was done in-house by the ESR. Steel formers were manufactured to bend and shape the curves and bends for the firebox plates. The bottom ten inches of outer firebox steel plate had to be removed due to thinning and scouring, and replaced by new plate. This plate is secured in place by welding, stays and rivets. The welding had to be to the high standard set by the Insurance Company and once carried out it had to be inspected by means of non-destructive testing. This was a specialist activity that an approved outside contractor was employed to carry out.

Grooving was discovered on the water side of both the front and rear outer firebox plates. The affected plate was removed and new three foot inserts made that were welded, stayed and riveted in place as before. The word riveting implies a simple task of popping a red-hot rivet into place and hammering it over. In fact each old steel rivet had to be carefully removed to minimise damage to the surrounding plates. The apertures in each plate were reamed out to clean them then a properly sized red-hot rivet was fitted and beaded into place. Where steel or copper stays were fitted, the holes were reamed out, threaded and a new stay inserted. A nut was fitted on the fire side of the stay, on the outer plates the stay was riveted over. As can be seen, a simple job had many repetitive actions before it could be considered complete.


Photo: Peter Todd
The slots cut in the backhead ready to fit new inserts.

 
                             
         

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