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THE VALUE OF STEAM PIPING INSULATION
I have noticed many steam heating problems can be associated with non insulated steam piping around the boiler, steam main and lateral piing to risers and run outs to first floor radiators.
Aside from causing vent valves not to work properly, cause vent valve failures and water hammer in the steam system and lose about 20% of the BTU value going to the radiators.
The example given is from chapter five of my book Steam the Perfect fluid for Heating and some of the Problems.