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Variable or constant speed Injection

Eric Member Posts: 95
Retro fitting boiler piping in elementary school. Have cracked cast iron boiler sections about every 2 years.

System is 1955 design with tempering air coils then water goes to buried steel pipe in slab.

about 20 classrooms with 80 gpm.

Currently primary only with a blending pump to keep boilers warm and 3 way valve. But I have observed 180 water leaving to classrooms and melting chocolate on the classroom floors.

Adding primary pumps with a low boiler delta T (high flow).
OSA reset.

With system mass. Is constant speed injection adequate.
Do you use SSR (solid state relays) for longer contant closeure life on starter of injection pump.
Our heating season is 8 months.
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