scope:

The rules and instructions given in this Code apply to HRSG units employed in combined cycle installations. Units operating with more than approximately 40 percent excess air shall be tested in accordance with the requirements of this Code. Units operating with less than approximately 20 percent excess air shall be tested in accordance with Performance Test Code PTC-4.1, Steam Generating Units. For units operating between 20 percent and 40 percent excess air, guidance as to the preferred test method can be obtained in Appendix 7.1. Orsat analysis is not required for tests performed under this Code. Testing of auxiliary equipment shall be governed by the Performance Test Code applying specifically to the auxiliary in question. This Code is not applicable to solid fuel fired units. The HRSG covered by this Code is encompassed by the envelope boundary shown in Fig. 1.1