A. The best “scale solvent” and “feed water purifier” is an honest, intelligent engineer who will regularly open up his boilers and clean them thoroughly, soaking boilers in rain water now and then.
Q. If you found a thin plate, what would you do?
A. Put a patch on it.
Q. Would you put it on the inside or outside?
A. Inside.
Q. Why so?
A. Because the action that has weakened the plate will then set on the patch, and when this is worn it can be repeated.
Q. If you found several thin places, what would you do?
A. Patch each and reduce the pressure.
Q. If you found a blistered plate?