Minnesota Administrative Rules

7011.0540 DERATE.

The owner or operator of indirect heating equipment who elects to achieve compliance with an applicable standard of performance by derating shall:

A.

advise the commissioner of the agency in writing of the intent to achieve compliance by derating and the capacity level at which the owner or operator intends to operate this equipment;

B.

agree to a permit condition in the required operating permit that prohibits operation of the equipment in excess of the derate level;

C.

install a boiler steam flow meter to continuously record, indicate, and integrate boiler steam flow, and shall:

(1)

submit a written report to the commissioner of the agency within ten days of any excess steam flow occurrence above the specified derate load;

(2)

use a one-hour averaging period in determining an excess above derate with corrections for deviations in steam pressure or temperature if required;

(3)

submit written yearly reports to the commissioner of the agency confirming that no excesses have occurred during normal operations;

(4)

retain and make available for inspection by the agency or its authorized employees or agents steam flow charts for a minimum period of two years following the date of measurement; and

D.

an effective method of physical limitation of boiler load shall be submitted for approval by the commissioner of the agency prior to authorization of a boiler derate. Such limitation may include but is not limited to, a tieback signal from the steam flow meter to the combustion control system cutting back fuel input at the derate load, a maximum limit stop on the fuel input control drive or valve, or such other equivalent physical means.

Statutory Authority:

MS s 116.07

History:

L 1987 c 186 s 15; 18 SR 614

Published Electronically:

February 25, 2008