The Boiler and Burner
The boiler is quite straightforward, designed with the ASME code in mind. The shell is rated 2500 PSI busting pressure well above the code’s 3.5 times working pressure. The heads are SA-516 grade 70 and are 3/8 inch thick per the minimum allowed for boilers less then 42 inches in diameter. The welding is PW-16.1 (a)The welded assembly was stress relived after welding. After tubing it hydro at 1000 PSI for well over eight hours.
The burner I cast in ductile iron and drilled it with 4000 holes. The venturi tubes are oversize from the original of 1-1/4 to 1-1/2. The vaporizer and pilot, burner, nozzle are as the original and the fuel is as original gasoline.
The water level indicator is of my own design and was incorporated into a Stanley type gauge. Modern but very reliable and accurate. The Stanley EX originally used the bucket type level indicator.
The operation of this boiler is manual for feed water, except for the steam pressure regulator that turns the burner fuel on and off.