Gorgeous color film about the technical / chemical test steps needed to determine water hardness level for boiler operation. No images of boilers practically, but mostly focused on the “hardness test”. In boilers the hardness of the water can cause the formation of scale and sludge or mud. The hardness must be removed in the makeup water to the return system. Total hardness should not exceed 50 PPM.
XD8442 Boilers and Their Operation Hardness Test U.S. Navy technical training film
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