Bandar abbas steam power plant project (4x350 mw)
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- Welding shall be inspected in accordance with API 650. Welds shown to have defects prohibited by API 650, shall be repaired by the methods permitted by this standard. - All tanks bottoms, shells and roofs shall be tested in accordance with API 650. - All tanks shall be fitted with all required appurtenances including items: 1) Vent, gooseneck type 2) High and low level indicator switches 3) Level gauge 4) Fitting connection 5) Over flow 6) Floating suction 7) Pumps suction 8) Suction heater 9) Water draw-off nozzles 10) Flanged roof nozzle 11) Two plugged couplings, one high, one low 12) Spare plugged connection at same elevation as pumps suction for future pipe line. 13) Roof and shell manholes 14) External circular stairway 15) Bottom heater 16) Sump and drain 17) Wind girder 2.2.2 Control of Spillage from Tanks Facilities shall be provided so that any accidental discharge of any fuel oil will be prevented from endangering important facilities adjoining property or reaching water ways as provided by either of the following: Remote Impounding The impounding area shall have a capacity not less than that of the one tank that can drain into it. The route of the drainage system shall be so located that, if the liquids in the drainage system are ignited the fire will not seriously expose tanks or adjoining property. The confines of the impounding area shall be located so that when filled to capacity, the liquid level will not be closer than 50ft (15m) from any property line that is or can be built upon, or from any tank. Impounding around Tanks by Diking - The volumetric capacity of the dike area shall not be less than the amount of liquid that can be released from the tank with in the diked area, assuming a full tank. - Each tank shall have a separate dike area. - A slope of not less than 1 percent away from the tank shall be provided for at least 50ft (15m) or the dike base, whichever is less. - To permit access, the outside based of the dike at ground level shell be no closer than 10 ft(3m) to any property line that is or can be built upon. - Walls of the diked area shall be of concrete to be liquid tight and to withstand a full hydrostatic head. - Piping passing through dike walls shall be designed to prevent excessive stresses as a result of settlement or fine exposure. - The minimum distance between tank and toe of the interior dike walls shall be 5ft (1.5m). - Provision shall be made for draining water from diked areas; such drains shall be controlled in a manner so as to prevent fuel oil from entering natural a hazard. Control of drainage shall be accessible under fine conditions from outside the dike. 2.3 Piping, Pumps, and Valves 2.3.1 Piping - All piping shall be steel and wall thickness of steel pipe shall be in accordance with ANSI B36.10 standard or other equivalent international approved standard, for welded and seamless on wrought-steel pipe. Listed flexible metalose may be used to reduce the effect of jarring and vibration or where rigid connection are impracticable, and shall be installed in full compliance with its listing. - Pipe shall be connected with standard fittings and tubing with fitting of listed type. Pipe connectors made of combustible materials or depending upon the frictional characteristics of combustible materials shall not be used. All threaded joints and connection shall be made tight with suitable lubricant or pipe compound. Unions requiring gaskets or packing, right or left coupling, and sweat fittings employing solder having a melting point of less than 1000F (538C) shall not be used in oil lines. Cast iron fittings shall not be used. Piping shall be substantially supported and protected against physical damage and where necessary protected against corrosion. - Where liquid fuel pipes are routed below ground level they shall be accommodated in lined trenches and in no case they shall be buried. 2.3.2 Oil Pumps and Valves - Oil pumps shall be a positive displacement type that automatically shuts off the oil supply when stopped. - A readily accessible manual shut off valve shall be installed at each point where required to properly control the flow of fuel in normal operation and where required to avoid oil spillage during servicing. The valve shall be installed to close against the supply. - Where a shut off valve is installed in the discharge line of an oil pump not an integral part of a burner, a pressure relief valve shall be connected into the discharge line between the pump and the shut off valve and arranged to return surplus oil to the supply tank or to bypass it around the pump, unless the pump includes an internal bypass. - Any fuel oil line incorporating a heater shall be provided with a relief valve arranged to discharge to the return line when any valve, pumps, or other device may prevent the release of excessive pressure because of the expansion of the fuel oil when heated. SPECIFICATION SECTION 368 - SAMPLING SYSTEM 1. General To keep complete control on different fluids flowing in various section of the power plant, lowering their corrosive effect to minimum by injection of adequate quantity of chemicals and consequently increasing plant equipment life and availability, effective and indicative sampling facilities shall be provided for different sections of the power plant as outlined here-under but not limited to : 1.1 Boiler & thermal cycle water & steam cycle, closed cycle cooling system, condensate polishing system 1.2 Flue gas streambefore and after air heater 1.3 Water Treatment Plant 1.4 Industrial waste water 1.5 Sewage treatment system 2. Scope of Supply 2.1 Sampling is divided into two categories: Category No. 1: On line sampling and analysis Category No. 2: Isokinetic sampling and manual or laboratory analysis Sampling from boiler & thermal cycle water & steam, make up, condensate polishing , closed cycle, flue gas, raw water & treated water according following table shall be considered in the scope of both categories which consists wherever applicable of measurement of PH, conductivity, cationic conductivity , silica, hydrogen, sodium, dissolved oxygen, SO2, NOX, etc. and carbon monoxide and oxygen in the flue gas. An express laboratory equipped with analyzers and lab facilities shall be considered nearby sampling system for instant manual measurement of critical parameters of boiler & thermal cycle water & steam, make up, condensate polishing , closed cycle. The list and specification ofproposed equipment and facilities shall be approved by engineer. The result of mentioned sampling/measurements shall be indicated as well as recorded.All of mentioned sampling lines shall be drawn to a common sampling room if feasible for Four units adjacent to chemical laboratory for easy access to control the performance of different systems. Possibilities to takesamples from those for laboratory analysis in sampling room also shall be provided. 2.2 All mentioned on line measurements wherever feasible which may go out of acceptable range shall be connected to control room Alarm / Annunciation system as well as to the Alarm/Annunciation of sampling room visible & audible from chemical laboratory. 2.3 Cooling of samples shall be done via closed cycle cooling system of the plant. 2.4 All necessary facilities shall be foreseen & provided to avoid high pressure or high temperature water or steam be admitted to measuring cells or continuous manual sampling branch. 2.5 On line measurements shall be automatically compensated for temperature, etc. 2.6 The system shall be complete from all mechanical, electrical, instrumentation & control point of view. NO SAMPLING POINT MEASURING ITEM MANUAL CONDUCTIVITY (μS/cm) PH DISSOLVED OXYGEN (DO2) SILICA (SiO2) 1 CIRCULATING WATER CONDENSER INLET O - - - - 2 MAKE-UP PUMP OUTLET O K - - - 3 CONDENSATE PUMP OUTLET O K O - - 4 LP HEATER DRAIN O - - - - 5 DEAREATOR INLET O K - - - 6 DEARATOR OUTLET O - O - - 7 HP HEATER DRAIN O - - - - 8 ECONOMIZER INLET O K O O - 9 STEAM DRUM WATER O K O - O 10 STEAM DRUM SATURATED STEAM O K - - - 11 MAIN STEAM O K - - O 12 HIGH TEMP. REHEAT STEAM O K - - - 13 CLOSED CIRCUIT COOLING WATER O K O - - 14 CONDENSATE POLISHING PLANT OUTLET O - - O - NOTE: 1- MARK " O" SHOWS MEASURING INSTRUMENT 2- MARK " K" MEANS MEASUREMENT AFTER CATION EXCHANGE SPECIFICATION SECTION 371 - RAW WATER SUPPLY 1. General Description This section covers the system, equipment and civil works required, to supply water for feedwater make-up to the boiler/thermal cycle units, aux. cooling system make-up fire fighting, potable, irrigation, industrial (i.e. general washing, pumps gland water if applicable, panic showers, etc.) and other ancillary service. Raw water shall be supplied from desalination plant.Raw water supply system should be well designed, considering sufficient water supply for the generation of required output of each powerplant. The estimated water supply will be determined at the design stage. Water shall be taken from the sea water intaketo a desalination plant which shall be designed and constructed in order to produce desalted water for water treatment plant, potable, service and irrigation water. The civil works shall be in accordance with the requirement of volume 3/1 of the specification. Work shall include, but not necessarily be limited to the following items: a) Two (2) raw water concrete storage tanks, each with 1000 m3 capacity. b) Pipe lines c) Disinfections system 2- Requirements 2.1 Reservoir The raw water storage tanks with sufficient capacity along with required lining, coating /insulation shall be finilized during design stage and provided at site for storage of rawwater. 2.2 Disinfection System To prevent the growth of microorganism in the reservoirs, facilities for Hypochlorite injection should be foreseen. Two daily tanks with proper capacity, two injection pumps, and all the related pipes and valves are requested. Material of construction for tanks, pipes valves and pumps should be corrosion resistance in presence of hypochlorite solution. 2.3 SUMP pit One sump pit with two pumps shall be provided (if required). 2.4 Service and irrigation water system The system will include necessary pumps, reservoirs and related piping system to provide plant requirements.Capacities, details and specification to be approved by Engineer. The source and quality of water for service water will be raw water from reservoir. Ten (10%) percent of the total area of power plant shall be considered as green area the capacity of irrigation system shall fulfill the water requirement of this area. SPECIFICATION SECTIONS 373 – DESALINATION PLANT 1.GENERAL DESCRIPTION A desalination plant of adequate capacity shall be designed to produce sufficient raw water for all power plant consumers. The plant shall use the heat rejected in the condensers as far as possible. 2. SCOPE OF SUPPLY Later SECTION 374&375 - WATER TREATMENT SYSTEM SPECIFICATION 1. GENERAL DESCRIPTION Water treatment systems should be properly designed based on the final detailed analysis of desalted water. The process of water treatment will be either ion exchange. The following specification is mainly about Ion exchange treatment system. For reverse osmosis treatment system the related specification shall be defined accordinglly. 2. SCOPE OF SUPPLY 2.1 Filtration System The system shall comprise 3×100% (2 in operation and 1 as standby) dual media or cartridge (up to Client) filters working in parallel. these filters should be equipped with air and water lines for back wash. full automatic back wash system should be provided for filters. Internal surface of the filters should be properly lined for corrosion protection. Three 100% 3×50% (2 in operation and 1 as standby) raw water pumps shall be provided to transfer raw water from raw water storage tanks to dual media or cartridge (up to Client) filters. Proper adsorption of excess chlorine before DM system to be foreseen. 2.2 Demineralization system Regarding the raw water analysis, contractor should properly design a demineralization system to be acceptable from techno-economical point of view. The quality of demineralized water should meet the following limits according to the boiler manufacturer requirements for boiler water regime and quality: Total dissolved solid (including silica) 0.02 ppm, Max Silica 0.02 ppm, Max Sodium 0.01 ppm, Max Conductivity not greater than 0.1μmhos/Cm 2.2.1 Ion Exchange System The followings shall be considered for design of water treatment plant: - The system shall consist of 4×75% (2 in operation and 1 as standby and 1 as regenerate) trains capable of producing treated water, together with any water required for plant regeneration. (One train shall be as stand by). - The minimum working period between two regeneration for each stream of cation and anion exchanger((as per design approved by engineer)) shall not be less than 18 hours and for mixed bed not be less than one week. - Each stream shall consist of separate cation bed, Degasifier, Anion bed (as per design approved by engineer) Mixed-bed units, including all necessary pumps, valves fittings, measuring and controls,resin trap, etc. to make the plant completely operable. - The units shall be equipped with suitable Ion exchange resins preferably of the polystyrene type and full technical performance data of the proposed resins shall be issued. - Resins should be selected from well known manufacturers which shall be approved by the Engineer. - All exchangers should be fluidized bed, double chamber, counter current regeneration system. Mixed bed should be conventional type.Other replaced alternative to be approved by the Engineer. - H2So4 and NaOH shall be used as regenerant for exchangers. - All exchangers, caustic storage tank and measuring tanks should be hard rubber lined with proper thicknessto the approval of engineer. - Caustic soda (NaOH) heating system and required auxiliary steam shall be provided. - Heat exchanger shall be considered for heating of DM water during regeneration of anionic resin. - Resin transfers to and from the beds shall be by means of water with proper related equipment (resin hopper). - Resin transfer for external washing to and from the beds shall be by means of water proper related equipment. - oil free compressed air shall be provided for regeneration, resin transfer and resin mixing. - Particular attention must be given to avoid freezing during cold winter and proper heat tracing shall be provided as necessary. - The system shall be arranged for automatic control throughout the production and regeneration cycles. - Provision shall also be made for manual intervention to allow production or regeneration to start at any time. |
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