SC Boiler Installation Practice Questions - South Carolina Boiler Installation Contractor Examination Exam

Why does NFPA 85 require a proven pre-purge of the boiler enclosure before a light-off trial for ignition?

To raise steam pressure to MAWP before the pilot is lit To sweep residual combustibles out of the furnace and gas passes so an ignition source cannot cause an explosion To dry the refractory after a boil-out To test the safety valves

Correct Answer:

To sweep residual combustibles out of the furnace and gas passes so an ignition source cannot cause an explosion

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