Heat Recovery Steam Generator Sample Clauses

Heat Recovery Steam Generator. In addition to the continuous monitoring of operating conditions of the boilers, an annual shut down inspection will be conducted to coincide with the turbine inspections consisting of the following: Shut down, cool down, vent and fill the HRSGs. Inspect all interior surfaces of the HRSGs for warped tube bundles, eroded or damaged fins and tubes, damaged or missing liner plates and clips, guide vanes or deflectors and all insulation. Examine all internal surfaces of the drums for corrosion, erosion, cracks, scale and dirt. Check the integrity of the internal steam separating devices, feedwater, blow down and chemical feed piping. Determine the need for cleaning and proper method if needed as well as the effectiveness of the boiler water chemistry program. Service safety valves and verify their proper functioning. Check all flow elements and orifices for proper condition. Check all valves for proper operation by cycling manual valves and inspecting for evidence of leakage. Repair all documented leaking valves and isolation devices. Inspect all surfaces in the exhaust gas path for corrosion and damage. Check all heat tracing elements for proper operation.
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Heat Recovery Steam Generator. The HRSG shall be of proven design with large number of units in operation and with a track record of high reliability. Steam headers and tubes designed and constructed with materials suitable for 300 startup cycles per year and 30-year life cycle. The HRSG shall be designed to operate in a floating-pressure and fixed-pressure mode. Seller shall meet the Facility startup times and provide detailed explanation of the startup sequence. The HRSG shall be designed, fabricated, and stamped in accordance with the ASME Boiler and Pressure Vessel Code (B&PVC), Section I and all codes and standards required therein. Any additional state or local requirements for certification of the HRSG pressure vessel shall be met. All materials not covered by ASME codes shall conform to the latest edition of the ASTM standard. The Purchaser must approve other materials being considered. The HRSG shall be supplementary fired with natural gas only. The HRSG will be designed not to have flame impingement. The HRSG will have space allocated for future addition of SCR and CO catalyst if the licensing requirements do not include these catalysts. If either catalysts are provided, additional space for future addition of one layer of catalyst shall be provided. The HRSG shall be suitable for operation at all loads from startup to the rated maximum steam generating capacity. The turndown ratio and rate of load change of the HRSG shall be compatible with the combustion turbine as far as possible. HRSG design shall include a condensate heater bypass to maintain the minimum specified gas outlet temperature. A recirculation system shall also be provided for condensate temperature control. Oxygen concentration in the feedwater/steam shall be less than 7 ppb or the steam turbine supplier requirements if lower. The deaerator shall be designed, fabricated, examined, tested, and stamped in accordance with ASME Code for Boiler and Pressure Vessels, Section I and The HEI “Standards and Typical Specifications for Deaerators.” If an integral deaerator is supplied, the deaerator shall use the low-pressure saturated steam from the low-pressure steam drum as the primary steam supply. Spray nozzles shall be spring-loaded, removable type made of 316 stainless steel, which shall maintain a uniform spray pattern from 10% to 110% of deaerator design flow. The trays shall be constructed of 430 stainless steel of not less than 16 gauge average thickness. Spot-welded tray construction is now allowable. The trays...

Related to Heat Recovery Steam Generator

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  • Loop Provisioning Involving Integrated Digital Loop Carriers 2.6.1 Where Xxxx has requested an Unbundled Loop and BellSouth uses IDLC systems to provide the local service to the End User and BellSouth has a suitable alternate facility available, BellSouth will make such alternative facilities available to Xxxx. If a suitable alternative facility is not available, then to the extent it is technically feasible, BellSouth will implement one of the following alternative arrangements for Xxxx (e.g. hairpinning): 1. Roll the circuit(s) from the IDLC to any spare copper that exists to the customer premises. 2. Roll the circuit(s) from the IDLC to an existing DLC that is not integrated. 3. If capacity exists, provide "side-door" porting through the switch. 4. If capacity exists, provide "Digital Access Cross Connect System (DACS)- door" porting (if the IDLC routes through a DACS prior to integration into the switch). 2.6.2 Arrangements 3 and 4 above require the use of a designed circuit. Therefore, non- designed Loops such as the SL1 voice grade and UCL-ND may not be ordered in these cases. 2.6.3 If no alternate facility is available, and upon request from Xxxx, and if agreed to by both Parties, BellSouth may utilize its Special Construction (SC) process to determine the additional costs required to provision facilities. Xxxx will then have the option of paying the one-time SC rates to place the Loop.

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