Minnesota Administrative Rules

5225.2500 LOW WATER DEVICES.

Subpart 1.

[Repealed, 13 SR 1917]

Subp. 2.

[Repealed, 13 SR 1917]

Subp. 3.

Requirements.

The following must be equipped with a low water cutout that will shut off the fuel supply in case of a low water condition:

A.

each automatically fired steam boiler; and

B.

each automatically fired hot water heating boiler or other hot liquid boiler plants of two or more boilers with individual isolating valves connected to a common header with a total heat input exceeding 750,000 Btu per hour input.

Subp. 4.

Flow-sensing device required.

The following must have a flow-sensing device installed in the outlet piping instead of the low water fuel cutoff required in subpart 3 to automatically cut off the fuel supply when the circulating flow is interrupted:

A.

a coil type boiler plant exceeding 750,000 Btu; and

B.

a watertube boiler plant with heat input greater than 750,000 Btu per hour requiring forced circulation to prevent overheating of the coils or tubes.

Statutory Authority:

MS s 175.171; 183.44; 183.465; 183.466; 326B.964; 326B.966

History:

13 SR 1917; L 2007 c 140 art 9 s 27; art 13 s 4

Published Electronically:

February 19, 2009