Note C — SPECIFICATIONS OF THE National Board of Fire Underwriters FOR THE MANUFACTURE OF STEAM FIRE PUMPS AS RECOMMENDED BY THE National Fire Protection Association.

Eight-inch preferred, this being the more common size for valves, fittings, and pipes.

These suction pipe sizes, although larger than common for trade pumps of the same size, are believed to be amply justified by experience, and exert a powerful influence toward enabling the pump to run smoothly at high speed with water cylinders filling perfectly at each stroke. No defect is more common than restricted suction pipes.