7 Del. Admin. Code § app G § 1124-A-G-4.0

Current through Register Vol. 28, No. 3, September 1, 2024

Section 1124-A-G-4.0 - Apparatus

[Note: this method is often applied in highly explosive areas. Caution should be exercised in choice of equipment and installation.] An acceptable measurement system includes a sample interface system, a calibration valve, gas filter and a pump preceding the analyzer. THC measurement systems are designated HOT or COLD systems based on the operating temperatures of the system. In HOT systems, all components in contact with the sample gas (probe, calibration valve, filter, and sample lines) as well as all parts of the flame ionization analyzer between the sample inlet and the detector must be maintained between 150° to 175°C. This includes the sample pump if it is located on the inlet side of the FID. A condensate trap may be installed, if necessary, to prevent any condensate entering the detector. The essential components of the measurement system are as follows:

4.1 Organic concentration analyzer. A Department-approved detector capable of meeting or exceeding the specifications in this method.

4.2 Sample probe. Use either 4.2.1 or 4.2.2 of this appendix.

4.2.1 Stainless steel, or equivalent, three-hole rake type. Sample holes shall be four millimeters (mm) (0.2 inches [in.] in diameter or smaller and located at 16.7, 50, and 83.3% of the equivalent stack diameter.

4.2.2 A single opening probe so that a gas sample is collected from the centrally located 10% area of the stack cross-section, and is representative of the emission.

4.3 Sample line. Stainless steel or Teflon¹ tubing to transport the sample gas to the analyzer. The sample line from the heated probe shall be heated to between 150 and 175°C (302 and 347°F).

4.4 Calibration valve assembly. Use either 4.4.1 or 4.4.2 of this appendix.

4.4.1 A heated three-way valve assembly to direct the zero and calibration gases to the analyzers.

4.4.2 Other methods, such as quick-connect lines, to route calibration gas to the analyzers.

4.5 Particulate filter. An in-stack or an out-of-stack glass fiber filter if exhaust gas particulate loading is significant. An out-of-stack filter must be heated.

4.6 Recorder. A strip-chart recorder, analog computer, or digital recorder for recording measurement data. The minimum data recording shall be one measurement value per minute. Full scale of the data recorder shall be selected so that the emission limit is between 30% and 50%.

7 Del. Admin. Code § app G § 1124-A-G-4.0