N.H. Admin. Code § Env-A 808.03

Current through Register No. 45, November 7, 2024

Section Env-A 808.03 - Minimum Specifications for CEM Systems

A gaseous or opacity CEM system shall meet the following minimum specifications, as applicable:

(a) A gaseous CEM system shall average and record the data for each calendar hour;

(b) An opacity CEM system shall:

(1) Average the opacity data to result in consecutive, non-overlapping 6-minute averages; and

(2) If subject to the exemption of Env-A 2002.04(b), total the number of minutes in any 8-hour period where the opacity, as averaged in non-overlapping 6-minute periods, exceeds the applicable opacity standard;

(c) All opacity and gaseous CEM systems shall;

(1) Include a means to display instantaneous values of percent opacity and gaseous emission concentrations; and

(2) Complete a minimum of one cycle of operation, which shall include measuring, analyzing, and data recording for each successive one-minute period for systems measuring gaseous emissions and complete a minimum of at least one measurement of opacity every 10 seconds which shall be averaged and recorded as consecutive, non-overlapping 6-minute averages for opacity monitoring systems unless a longer time period is approved in accordance with Env-A 809;

(d) A stack volumetric flow measuring device shall meet the following requirements:

(1) All differential pressure flow monitors shall have an automatic blow-back purge system installed and, in wet stack conditions, shall have the capability for drainage of the sensing lines; and

(2) The stack flow monitoring system shall have the capability for manual calibration of the transducer while the system is on-line and for a zero check; and

(e) Alternatives to in-stack flow monitoring devices for determination of stack volumetric flow rate shall be used only if the owner or operator provides the department with technical justification that the alternative can meet the same requirements for data availability, data accuracy, and quality assurance as an in-stack device.

N.H. Admin. Code § Env-A 808.03

#7788, eff 10-31-02; ss by #9802, eff 10-31-10

Amended by Volume XXXIX Number 19, Filed May 9, 2019, Proposed by #12762, Effective 5/1/2019, Expires 5/1/2029.