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® WorleyParsons <br /> resources&energy <br /> motorized stack dampers. The internal bottom portion of the breeching and stack (field <br /> welds and up ten (10) feet) will be coated and insulated with a "stalastic-type" material <br /> (such as Intertherm 228). Externally, the HRSG shall be insulated from the last tube <br /> row through the breeching up to the stack damper elevation. In addition, each HRSG <br /> scope of supply will include the necessary emissions control equipment (i.e., SCRs <br /> and/or CO catalysts) as specified in Section 1. <br /> The gas path will be insulated with ceramic fiber blanket to provide a skin temperature <br /> of not more than 140°F, and lined with stainless steel (ASTM A-312 grade 309 where <br /> temperatures exceed 800°F). <br /> Man-ways will be provided for access to each section of the HRSG between modules. <br /> The manways will be provided with a davit, or will be hinged. The size of the opening <br /> will be suitable for maintenance expected in that section, and in no case be less than 24 <br /> X 18 inches. <br /> Operating areas of the HRSG will be provided with platforms. Exterior platforms, <br /> ladders, rails, and structural steel will be hot dip galvanized. Handrails will be <br /> fabricated from 1 1/2 - inch diameter steel pipe. Penetrations through platform decking 6 <br /> inches or greater in diameter will be finished with plate material. <br /> The vent valves, safety relief valves, silencers, and supporting steel frames will be <br /> provided by the HRSG supplier. All vent lines will be extended to a safe location <br /> (pointing away from any platforms). <br /> Heat tracing and adequate draining of the HRSG in cold weather will be used to prevent <br /> freeze-up of the internal piping of the HRSG. Drain lines will be provided after the <br /> double block valves, as well as impulse lines from root valves up to and including <br /> transmitter blow-offs, and HP, IP, and LP Drum Level control valves. Drain line <br /> connections will also be provided on the vent side of the startup vent valve, power relief <br /> valve and safety valves. If silencers are provided with drains, the drain will be piped to a <br /> drain manifold. <br /> Each HRSG will be provided with sparging steam connections on all three drums at the <br /> lower downcomer connection, and additionally, a drum warming connection on the HP <br /> drum saturated steam lines. <br /> 3.3.2 Stack <br /> The stack will be provided with emission sampling ports in accordance with EPA, State, <br /> and local regulatory requirements. A platform located at the sampling port elevation <br /> will be provided with ladder access, either from grade or from an adjacent HRSG <br /> platform. An expanded metal standoff shield will be provided by HRSG supplier to <br /> prevent human contact with 1407 or hotter surfaces, unless external insulation is being <br /> utilized with a stack damper as described in 3.2.1 above. A davit will be provided by the <br /> Lodi Energy Center 3.3 -4 LEC AFC <br /> 071508 Rev.A <br />