Purchase and sale Agreement / Combined Cycle
1.OVERALL FACILITY CONFIGURATION......
1.1.Major Components......
1.2.Balance of Plant Support Systems......
2.SITE CONDITIONS......
2.1.Site Elevation and Barometric Pressure......
2.2.Temperatures......
2.3.Precipitation, Wind and Earthquake......
3.CODES AND STANDARDS......
3.1.State and Local Building Codes, Standards and Ordinances......
3.2.U.S. Government Codes, Ordinances, and Standards......
3.3.American Society of Mechanical Engineers......
3.4.American National Standards Institute......
3.5.Industry Standards......
3.6.Electric Utility Requirements......
4.TECHNICAL REQUIREMENTS......
4.1.System Descriptions......
4.2.Plant Identification System......
4.3.Supplier Factory Tests......
4.4.Testing......
4.5.Welding......
4.6.Lubrication......
4.7.Consumables......
5.OPERATIONAL REQUIREMENTS......
6.MAJOR MECHANICAL EQUIPMENT AND SYSTEMS......
6.1.Combustion Turbine......
6.1.1.Turbine Supervisory Instrumentation......
6.1.2.Inlet Air Filter......
6.1.3.Acoustic Enclosures......
6.1.4.Water Wash System......
6.1.5.Combustion Turbine Exhaust Duct......
6.2.Heat Recovery Steam Generator......
6.2.1.HRSG Casing......
6.2.2.HRSG Burner System Valves......
6.2.3.Duct Burners......
6.2.4.Feedwater System......
6.2.5.Temperature Monitoring......
6.2.6.Blowdown Tanks......
6.2.7.Exhaust Stack......
6.3.Steam Turbine and Associated Components......
6.3.1.Lube and Control Oil Systems......
6.3.2.Gland Steam Sealing System......
6.3.3.Turning Gear......
6.3.4.Piping......
6.3.5.Steam Strainers......
6.3.6.Drains......
6.3.7.Insulation and Lagging......
6.3.8.Chemical Cleaning......
6.3.9.Guards......
6.3.10.Main Steam System......
6.3.11.Exhaust Hood Sprays......
6.3.12.Instrumentation and Control......
6.4.Heat Rejection Systems......
6.4.1.Condenser......
6.4.2.Steam Turbine Bypass......
6.4.3.Condensate System......
6.4.4.Circulating Water System......
6.4.5.Auxiliary Cooling Water System......
6.4.6.Closed Cooling Water System......
6.4.7.Mechanical Draft Cooling Tower (as applicable)......
6.4.8.Air-Cooled Condenser (if applicable)......
6.4.9.Pumps......
6.5.Piping......
6.5.1.Piping Materials......
6.5.2.Pipe Velocities......
6.5.3.Pipe Hangers and Supports......
6.6.Valves......
6.6.1.Drain and Vent Valves and Traps......
6.6.2.Low-Pressure Water Valves......
6.6.3.Instrument Air Valves......
6.6.4.Non-Return Valves......
6.6.5.Motor-Actuated Valves......
6.6.6.Control Valves......
6.6.7.Safety and Relief Valves......
6.6.8.Instrument Root Valves......
6.6.9.Float-Operated Valves......
6.6.10.High-Pressure Valves......
6.7.Insulation and Freeze Protection......
6.8.Tanks......
6.9.Heat Exchangers......
6.10.Pressure Vessels......
6.11.Fuel Gas Supply System......
6.12.Water Source and Treatment System......
6.13.Demineralized Water (Condensate Makeup)......
6.14.Wastewater Treatment and Discharge......
6.15.Sump Pumps......
6.16.Potable Water......
6.17.Fire Protection System......
6.17.1.General......
6.17.2.Seller’s Responsibility......
6.17.3.Fire Protection Master Plan and Design Basis......
6.17.4.Codes, Standards and Recommendations......
6.17.5.Other Codes and Standards......
6.17.6.Materials, Equipment and System Components Listings and Approvals......
6.17.7.Fire Protection Water Supply and Water Storage......
6.17.8.Fire Pumps......
6.17.9.Underground Fire Protection Water Main System and Hydrants......
6.17.10.Fire Hydrants......
6.17.11.Fire Protection and Detection System......
6.18.Fire Detection System......
6.19.Compressed Air System......
6.20.Cranes, Hoists, and Trolleys......
6.21.Heating Ventilating and Air Conditioning......
6.21.1.System Function......
6.21.2.Buildings and Enclosures......
6.21.3.Air Conditioning System......
6.21.4.Battery Room Exhaust System......
6.21.5.Design Parameters......
6.21.6.Standards......
6.22.Chemical Injection Skids, Chemical Storage, and Bottled Gas Storage......
7.MAJOR ELECTRICAL EQUIPMENT AND SYSTEMS......
7.1.Frequency and Voltage Limits......
7.1.1.Frequency......
7.1.2.Voltage......
7.2.Auxiliary Equipment......
7.3.Synchronous Generator......
7.3.1.Construction of the Generator......
7.3.2.Accessories......
7.3.3.Generator Neutral Grounding......
7.3.4.Excitation Systems......
7.4.Isolated-Phase Bus Ducts, Non-Segregated Phase Bus Ducts, and Generator CircuitBreakers
7.5.Plant Electrical Auxiliary Systems......
7.6.Electrical System Design and Equipment Requirements......
7.7.Automatic Generation Control Terminal......
7.8.Generator Bus......
7.9.Neutral Grounding Equipment......
7.10.GSU Transformer Bank......
7.10.1.GSU Cooling System......
7.10.2.Generator Breakers......
7.11.Unit Auxiliary Transformer......
7.12.System Protection......
7.12.1.Generator Protective Relaying......
7.12.2.Generator Bus and Transformer Protective Relaying......
7.12.3.Main Power Transformer Protective Relaying......
7.12.4.Auxiliary System Relaying......
7.12.5.Major Interlocks......
7.12.6.Lockout Relay Actions......
7.12.7.Protective Relays......
7.13.MediumVoltage Bus Duct......
7.13.1.Non-Segregated Phase Bus Duct/Cable Bus (as required)......
7.13.2.Bus Ratings......
7.13.3.Cable Bus Duct......
7.13.4.Bus Ratings......
7.13.5.Conductors......
7.13.6.MediumVoltage System......
7.14.Low-Voltage System......
7.14.1.System Configuration......
7.14.2.Transformers......
7.15.Switchgear......
7.16.Motor Control Centers......
7.16.1.Operational Requirements......
7.16.2.Protection......
7.17.Alternate Power Source......
7.18.Essential Service AC System......
7.18.1.Uninterruptible Power Supply......
7.18.2.Rectifier......
7.18.3.Inverter......
7.18.4.Static Transfer Switch......
7.18.5.Essential Service 120V AC Distribution Panelboard......
7.19.Essential Service DC System......
7.19.1.Batteries......
7.19.2.Battery Accessories......
7.19.3.Battery Chargers......
7.20.Motors......
7.20.1.4,000-Volt Motors......
7.20.2.Low-Voltage Motors......
7.20.3.Standby Power Generator......
7.21.Miscellaneous......
7.21.1.Communications Section......
7.21.2.Security......
7.21.3.Panelboards......
7.21.4.Grounding and Lightning Protection System......
7.21.5.Cathodic Protection System......
7.21.6.Lighting Systems......
7.21.7.Cable and Raceway Systems......
7.22.General Wiring Requirements......
7.23.Protective Relay Panel Functional Requirements......
7.24.Workstations......
7.25.Testing and Checking of Electrical Equipment......
7.26.Embedded Work......
7.27.Freeze Protection......
7.28.Switchyard......
7.28.1.Circuit Breakers......
7.28.2.Disconnect Switches......
7.28.3.System Protection......
7.28.4.Control......
7.28.5.Power Metering......
7.28.6.Non-Revenue Metering......
7.28.7.Steel Structures......
7.28.8.Miscellaneous......
7.28.9.Switchyard Grounding and Lightning Protection......
7.28.10.Stability Study......
8.INSTRUMENTATION AND CONTROL REQUIREMENTS......
8.1.Distributed Control System......
8.1.1.Performance Requirements......
8.1.2.Functional Requirements......
8.1.3.Console Design......
8.1.4.Hardware Requirements......
8.1.5.DCS Partitioning......
8.1.6.Power......
8.1.7.System Failure Protection......
8.1.8.DCS Communication Network......
8.1.9.Printers......
8.1.10.Computing Hardware and System I/O......
8.1.11.System Cabinets......
8.1.12.Electrical Design Criteria......
8.2.Software Requirements......
8.2.1.Data Acquisition......
8.2.2.DCS Interfaces......
8.3.Testing......
8.3.1.Tools......
8.3.2.Installation and Operating Instructions......
8.4.Continuous Emissions Monitoring System......
8.4.1.Analyzer Subsystem......
8.4.2.Sample Transport System......
8.4.3.Stack Gas Monitoring Equipment......
8.4.4.CEMS Data Logger......
8.4.5.CEMS Enclosure......
8.4.6.Documentation......
8.4.7.Shipping......
8.4.8.Factory Checkout......
8.5.Data Acquisition System......
8.5.1.Software......
8.5.2.Data Communications System......
8.5.3.Reporting and Recordkeeping Requirements......
8.5.4.Quality Assurance and Quality Control Data......
8.6.Balance-of-Plant Instrumentation Installation Criteria and Installation Details......
8.6.1.Scope of Specification......
8.6.2.Instrumentation Electrical Requirements......
8.6.3.Pressure Instruments......
8.6.4.Temperature Instruments......
8.6.5.Level Instruments......
8.6.6.Level Gauges......
8.6.7.Flow Elements – Flow Nozzles and Venturis......
8.6.8.Flow Elements – Orifice Plates......
8.6.9.Annunciators, Alarm Switches, and Electrical Devices......
8.6.10.Process Analyzers and Analyzer Systems......
8.6.11.Pressure and Temperature Switches......
8.7.Instrument Air and Service Air Systems......
8.8.Field-Mounted Instruments......
8.8.1.Instrumentation - General Design......
8.8.2.Instrument Cabinets and Local Control Panels......
8.8.3.Instrument Tubing and Piping......
8.8.4.Air Piping, Fittings, and Pneumatic Devices......
8.9.Steam/Water Sampling and Analysis......
8.10.Vibration Monitoring System......
8.11.Plant Siren System......
8.12.Instrument Calibration......
8.13.I&C Maintenance Area Requirements......
9.CIVIL AND STRUCTURAL WORKS......
9.1.Design Criteria......
9.1.1.Dead Loads......
9.1.2.Live Loads......
9.2.Site Preparation......
9.3.Geotechnical Investigations......
9.4.Surveying......
9.5.Site Development and Earthwork......
9.6.Temporary Construction Facilities......
9.7.Facility Grading......
9.7.1.Earthwork......
9.7.2.Clearing and Grubbing......
9.7.3.Stripping......
9.7.4.Disposal of Unusable Soils......
9.7.5.Erosion Control......
9.7.6.Existing Underground Facilities......
9.8.Access......
9.9.Storm Water Drainage......
9.9.1.Clean Storm-Water Sewer and Ditch System......
9.9.2.Miscellaneous Valved Storm-Water Runoff......
9.9.3.Sanitary and Oily Waste Water Drainage Systems......
9.9.4.Sanitary Wastewater......
9.9.5.Oil-Contaminated Wastewater Sewer System......
9.9.6.Process Wastewater......
9.10.Roads, Parking Lots, and Walkways......
9.10.1.Facility Roads......
9.10.2.Road Width and Clearance Requirements......
9.10.3.Road Pavement......
9.10.4.Parking Lots......
9.10.5.Chemical Unloading......
9.10.6.Facility Area Surfacing......
9.10.7.Surfacing Plan......
9.11.Landscaping......
9.12.Fencing and Signage......
9.13.Buildings......
9.13.1.Location and Footprint of Buildings......
9.13.2.Building Requirements and Sizes......
9.13.3.Architectural......
9.13.4.Furnishings......
9.13.5.Building Systems......
9.14.Foundations for Equipment and Structures......
9.15.Concrete Work......
9.16.Masonry Work......
9.17.Steel Work......
9.17.1.Steel Grating and Steel Grating Stair Treads......
9.17.2.Stairs and Ladders......
9.18.Painting and Coatings......
9.19.Design......
9.20.Construction......
9.21.Testing and Inspections......
10.DOCUMENT SUBMITTALS......
10.1.Documents To Be Submitted For Purchaser Review and Comment......
10.2.Performance Curves......
10.3.Purchaser’s Right to Receive Additional Documents for Information......
10.4.Documents To Be Submitted Before Turnover of Facility......
10.5.Drawings and Lists......
10.6.Instruction Books and Operating Manuals......
All Source RFO: Revised 03-31-08Page 1 of 214
Appendix N2_CombinedCycle.doc
Pacific Gas and Electric Company / Technical Specifications: Appendix N2Purchase and sale Agreement / Combined Cycle
1.OVERALL FACILITY CONFIGURATION
The Facility will include ______Units and other balance-of-plant (BOP) systems and facilities for a complete, fully operational, combined cycle Facility. Each Unit will include identical ______combined cycle power islands and balance-of-plant (BOP) systems and facilities associated with the Unit. Each power island includes ______combustion turbine generators (CTGs) with each CTG exhausting through a multi-pressure-level, reheat, fired heat recovery steam generator (HRSG). Steam from the HRSG will be fed to a steam turbine generator (STG). NOx emission control will be accomplished using a dry low NOx (DLN) combustor as well as Selective Catalytic Reduction (SCR) in the HRSG. An inlet air filtration system will be included to provide suitably filtered combustion air to the CTG. CGT inlet cooling will be provided.
Power for each Unit will be generated at ____ (CTG) and ____ (STG) and stepped up through an individual main transformer to the Utility grid. An on-site switchyard shall be designed, furnished and installed to meet the interconnect utility, ISO and WCCP requirements.
1.1.Major Components
The Facility shall consist of the following major components:
- ______CTGs, complete with DLN combustors, inlet coolers, and all other auxiliaries
- ______three-pressure, reheat, unfired, horizontal gas flow HRSGs, each equipped with an exhaust stack with dampers, transitions, expansion joints, an SCR system to control emissions of NOx, a CO reduction catalyst system and all other auxiliaries
- ______single flow exhaust, reheat steam turbine generators with auxiliaries
1.2.Balance of Plant Support Systems
The BOP support systems include, but are not limited to, the following:
- One Distributed Control System (DCS) for the combined cycle facility and balanceofplant (BOP) control, data acquisition and data analysis.
- One natural gas system
- One liquid fuel system, if applicable
- Main steam systems, for each of the power islands, each including cascade-type turbine bypass for high pressure, intermediate pressure and reheat steam, and turbine bypass directly to the condenser
- Condensate systems
- Feedwater systems
- HRSG blowdown systems
- Ammonia unloading, storage, and transfer systems
- Interconnecting piping for combustion turbine liquid fuel system (if applicable), and for steam turbine steam/condensate drain, lube oil, and seal steam systems
- Condenser and cooling towers or air cooled condensers and auxiliaries
- Cooling water systems (including Wet Surface Air Condenser (WSAC) if necessary for an air cooled configuration)
- Raw water treatment system
- Cycle makeup water treatment system
- Feed water tank
- Fire/filtered water storage tank
- Demineralized water storage tanks
- Chemical storage and injection systems for the condensate and feedwater systems
- Hypochlorite storage and injection system , if required
- Domestic (potable) water system, including well or utility interconnect
- Sanitary waste system
- Process waste water system
- Fire detection, alarm, and suppression systems
- Instrument air system
- Service air system
- Permanent Facility communications system
- Heating, ventilating and air conditioning (HVAC) systems
- Storm water management system
- Sampling system
- Emergency power system, including emergency electric power generator
- Electric power distribution system
- Lighting system
- Lightning protection system
- Cathodic protection system
- Freeze Protection system, if required by environmental conditions
- Grounding system
- Expansion joints
- Roads (including the access road), fencing and parking
- Transmission interconnection facilities,
- Continuous Emissions Monitoring System (CEMS), and Data Acquisition and Handling System (DAHS)
- Administrative and maintenance buildings
- Hydrogen gas trailer or skid (if applicable,) and other bottle gases (e.g., CEMS, CO2)
- Natural gas line and on-site metering station per the pipeline company interconnect requirements
- Electrical transmission tie-in
- Interfaces with the above temporary or mobile systems including mobile demineralizer trailers.
2.SITE CONDITIONS
The facility shall be designed in accordance with the Site Conditions specified in AppendixN3.
2.1.Site Elevation and Barometric Pressure
The facility shall be designed based on the site elevation listed in AppendixN3.
2.2.Temperatures
Equipment shall be designed to operate and stand down without damage throughout the temperature range listed in AppendixN3.
2.3.Precipitation, Wind and Earthquake
The Facility shall be designed for the maximum rainfall conditions listed in Appendix N3. Snow Load (if applicable)
Design snow loads shall be in accordance with the requirements set forth in the California Building Code and or local governing building code.
Design wind loads shall be in accordance with the requirements set forth in the California Building Code and or local governing building code. The Importance Factor for wind shall be 1.0 (non-essential facility). The applicable basic wind velocity in mph and the site specific exposure (B, C or D) is listed in Appendix N3.
Seismic design loads shall be in accordance with the requirements set forth in the CaliforniaBuilding and or local governing building code. The applicable seismic zone shall be either Zone 4 or Zone 3 for the specific site location. The site shall be assigned a soil profile type as substantiated by geotechnical data for the specific site. The Importance Factor for seismic shall be 1.0 (non-essential facility). The applicable seismic zone, soil profile type, and seismic coefficients Ca and Cv are listed in Appendix N3.
The site footprint shall not be located in a floodplain.
3.CODES AND STANDARDS
Systems and equipment shall be designed in accordance with Codes and Standards, Regulations, Governmental Approvals and Governmental Rules in effect at the date of execution of this Contract. Applicable sections of Governmental Rules will be referenced as required in the relevant technical specifications. In case of conflict among this Scope Document, referenced Governmental Rules, and manufacturer's standard practices, the Purchaser shall determine which will govern. Where there are no applicable Governmental Rules, power industry practices shall apply.
3.1.State and LocalBuilding Codes, Standards and Ordinances
- Code, Rules and Regulations of the State of California
- CaliforniaBuilding Code
- California OSHA (CALOSHA)
- Local laws, ordinances, and regulations
3.2.U.S. Government Codes, Ordinances, and Standards
- Occupational Safety and Health Act (0SHA) 29 CFR 1910, 1926
- Federal Aviation Agency (FAA) Obstruction Marking and Lighting AC No. 70/7460IJ)
- Environmental Protection Agency (EPA) 40 CFR 423, 40 CFR 60, 40 CFR 72, 40 CFR 75, 40 CFR 112
- Appendix A to Part 36, “American Disability Act Accessibility Guidelines for Buildings and Facilities
3.3.American Society of Mechanical Engineers
The following standards of the American Society of Mechanical Engineers (ASME) shall be followed:
- ASME Boiler and Pressure Vessel Code Sections:
IPower Boilers
IIMaterial Specifications
Part A: Ferrous Materials
Part B: Nonferrous Materials
Part C: Welding Rods, Electrodes, and Filler Metals
VNondestructive Examination
VIIIPressure Vessels Division 1
IXWelding and Brazing Qualifications
- ASME B31.1 - Power Piping
- ASME Standard TDP-1 Recommended Practices for the Prevention of Water Damage to Steam Turbines Used for Electric Power Generation, Part I Fossil Fueled Plants
- ASME Performance Test Codes:
The following performance test code may be used as guidance in conducting the performance for the overall facility:
- PTC 46Overall Plant Performance
- PTC 1General Instructions
- PTC 19.1Measurement Uncertainty
The following performance test codes may be used as guidance in conducting performance tests if a shortfall in overall Facility performance requires individual component testing:
- PTC 4.4Gas Turbine Heat Recovery Steam Generators
- PTC – 6Steam Turbines (Alternative Tests)
- PTC -6 (Report)Guidance for Evaluation of Measurement Uncertainty in Performance Tests of Steam Turbines
- PTC 19.2Pressure Measurement
- PTC 19.3Temperature Measurement
- PTC – 22Gas Turbine Power Plants
3.4.American National Standards Institute
The following standards of the American National Standards Institute (ANSI) shall be followed:
- B16.1Cast Iron Pipe Flanges and Flanged Fittings
- B16.5Steel Pipe, Flanges, and Fittings
- B16.34Steel Valves
- B30.17Overhead and Gantry Cranes
- B133.8Gas Turbine Installation Sound Emissions
- C2 National Electrical Safety Code
- C37.010Application Guide for AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis
- C37.04Standard Rating Structure for AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis
- C37.06Switchgear AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis Preferred Ratings and Related Required Capabilities
- C37.13 Standard for low Voltage AC Power Circuit Breakers Used in Enclosures
- C37.20.1 Standard for MetalEnclosed LowVoltage Power Circuit Breaker Switchgear
- C37.20.2 Standard MetalClad and StationType Cubicle Switchgear
- C37.23Guide for MetalEnclosed Bus and Calculating Losses in IsolatedPhase Bus
- C37.30Definitions and Requirements for HighVoltage Air Switches, Insulators, and Bus Supports
- C50.41Polyphase Induction Motors for Power Generating Stations
- C57.12.10Transformers 230 kV and below, 833/958 through 8,333/110,417 kVA Single Phase and 750/862 through 60,000/80,000/100,000 kVA Three Phase without Load Tap C Changing, and 3,750/4,682 through 60,000/80,000/100,000 kVA With Load Tap Changing Safety Requirements
- C57.12.55Transformers DryType Transformers Used in Unit Installation, Including Unit Substations
- C57.12.70Terminal Markings and Connections for Distribution and Power Transformers
- C57.13Standard Requirements for Instrument Transformers
- C57.109Guide for Transformer ThroughFaultCurrent Duration
- C62.11Standard for MetalOxide Surge Arresters for AC Power Circuits
3.5.Industry Standards
Applicable standards issued by the following industry organizations:
- American Association of State Highway and Transportation Officials (AASHTO)
- American Boiler Manufacturers Association (ABMA)
- American Concrete Institute (ACI)
- American Gas Association (AGA)
- American Gear Manufacturers Association (AGMA)
- American Institute of Steel Construction (AISC)
- American Iron and Steel Institute (AISI)
- Air Moving and Conditioning Association (AMCA)
- American National Standards Institute (ANSI)
- American Petroleum Institute (API)
- American Society for Nondestructive Testing (ASNT)
- American Society for Testing and Materials (ASTM)
- American Society of Heating, Refrigerating, and AirConditioning Engineers (ASHRAE)
- American Water Works Association (AWWA)
- American Welding Society (AWS)
- AntiFriction Bearing Manufacturers Association (AFBMA)
- Crane Equipment Manufacturer’s Association of America (CMMA)
- Expansion Joint Manufactures Association (EJMA)
- Fluid Control Institute (FCI)
- Heat Exchange Institute (HEI)
- Hydraulic Institute (HI) Standard for Pumps
- Illuminating Engineering Society (IES)
- Institute of Electrical and Electronics Engineers (IEEE)
- Insulated Cable Engineers Association (ICEA)
- Instrument Society of America (ISA)
- Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry
- MetalBuilding Manufacturers Association (MBMA)
- National Association of Corrosion Engineers (NACE)
- National Electrical Manufacturers Association (NEMA)
- National Fire Protection Association (NFPA) National Fire Codes
- Pipe Fabrication Institute (PFI)
- Sheet Metal and Air Conditioning Contractors National Association (SMACNA)
- Steel Structures Painting Council (SSPC)
- Thermal Insulation Manufacturers Association (TIMA)
- Tubular Exchanger Manufacturers Association (TEMA)
- Underwriters Laboratories, Inc. (UL) - fire protection equipment only
- Welding Research Council (WRC)
3.6.Electric Utility Requirements
- California ISO
- PG&E Interconnection Requirements– see
- Western Electricity Coordinating Council (WECC)
- California Energy Commission
- Utility interconnect requirements for fuel (gas), power transmission, and water.
4.TECHNICAL REQUIREMENTS
Longterm safety, reliability, operability, and maintainability of the Facility are of primary concern to the Purchaser. As a result, the Seller shall take prudent measures in the design to facilitate ease of operation and provide adequate access to all equipment. Where required to perform normal maintenance functions, facilities such as equipment removal monorails shall be provided. Wherever practical, valves and instruments shall be located such that they can be operated and easily accessed from grade. Where valves and instruments normally requiring operator access must be located in elevated locations, access platforms, handrails, and ladders shall be provided. All valves (including safety and relief valves) and components shall be accessible for routine maintenance.Minimum clearance over walkways and platforms shall be 7'6". Adequate provisions for removal of the generator rotor and turbine maintenance and laydown must be provided in the general arrangement proposed by the Seller. Platform access with stairs shall be provided to all metering and custody transfer points that are not readily accessible from grade. All task lighting applications shall be arranged to provide shadow-free lighting for the area.