02-658 C.M.R. ch. 13, § 5 - Low Water Control for Boilers

13.5.1 Low Water Control Required

All gas-fired boilers must be provided with a properly installed and operating low water cut-off.

13.5.2 Location

The low water cut-off may be installed in or attached to the boiler at the level recommended by the boiler manufacturer, but in no case shall the low water cut-off be installed below the crown sheet. The low water cut-off, when not installed directly in the boiler, may be installed either in the main supply line (vertical riser) as close to the boiler as possible or in a water column of continuous piping attached directly to the boiler.

13.5.3 Appropriate Design

The low water cut-off must be designed and approved for the medium used (steam or water).

13.5.4 No Obstructions

No valves or other obstructive devices shall be installed between the boiler and safety controls.

13.5.5 Acceptable Manufacturer's Alternatives

13.5.5.1 Installations meeting the low water cut off requirements of NFPA 54 shall be accepted as meeting the provisions of this Section.

13.5.5.2 A pressure switch installed by the manufacturer and specified by the manufacturer as low-water protection shall be accepted as meeting the low water cut off requirements of NFPA 54.

Notes

02-658 C.M.R. ch. 13, § 5