THÔNG TIN TÀI LIỆU
ICS 中华人民共和国国家标准 GB/T8564—2003 代替 GB8564—1988 水轮发电机组安装技术规范 Specification installation of hydraulic turbine generator units 20 - - 发布 20 - 中华人民共和国国家质量监督检验检疫总局 发 实施 布 GB/T 8564-2003 Table of Contents Foreword Scope Normative References General General Requirements Installation of Vertical Reaction Turbine Installation of Through Flow Turbine Installation of Reaction Turbine Installation and Commissioning of Speed-Governing System Installation of Vertical Hydraulic Turbine Generator 10 Installation of Horizontal Hydraulic Turbine Generator 11 Installation of Bulb Hydraulic Turbine Generator 12 Installation of Pipelines and Fittings 13 Installation of Butterfly Valve and Globe Valve 14 Electrical Tests on Hydraulic Turbine Generator Unit 15 Trial Run of Hydraulic Turbine Generator Unit Appendix A (Informative Appendix): List of Hand-over Documentation Appendix B (Normative Appendix): Installation requirements of mechanical hydraulic governor Appendix C (Normative Appendix): Requirements on the drying of hydraulic turbine generator stator Appendix D (Informative Appendix): Pickling, Passivation and Rinsing of Pipe Appendix E (Informative Appendix): Standards Related to Nondestructive Inspection of Welds Appendix F (Informative Appendix): Requirements on Steam Turbine Oil Stipulated in GB11120-1989 Appendix G (Normative Appendix): Description on Standard Wording Foreword This standard covers the installation, commissioning and test for hydraulic turbine generator units and their auxiliary equipment It is also the main content involved in the acceptance test and examination for generator units It is applicable for the installation of various hydraulic turbine generator units and their auxiliary equipment This standard is the revision of GB 8564-1988 Specification Installation of Hydraulic Turbine Generator Units (The Original Standard in short hereafter) The Original Standard is a summary of Chinese professionals on the installation of hydraulic turbine generator units and their auxiliary equipment based on the accumulated experience by 1988 This standard has made some supplements, deletion and modifications on the basis of The Original Standard according to the requirements in the installation of numbers of newly-built large- and medium- scale hydraulic turbine generator units and their auxiliary equipment including the imported large-scale hydraulic turbine generator units, and at the same time assimilating some contents in the relevant foreign standards Compared with the 1988 version of GB 8564-1988, this standard has made the following revisions: — This standard is defined as a recommended standard; — The applicable scope of this standard is revised, and the sections “Scope” and “Normative References” are listed separately; — New contents are added, including installation of cylinder valve, installation of reaction turbine and bearing assembly, assembly of welded rack of generator, on-site assembly of generator stator frame and iron core, welding of disc- rotor field spider, installation of excitation system, and trial operation of reversible pumped-storage generating unit so on; — Some contents are supplemented, including governor installation, oil filling and adjustment test of speed-governing system, requirements on pipeline welding technology, and quality inspection so on; — Some contents are deleted from the text, e.g installation of mechanical-hydraulic governor, exciter and permanent magnetic generator The contents on installation of mechanical-hydraulic governor and drying of stator winding are listed as appendices; — The indexes and limits in some clauses are partially adjusted and improved Internal water cooling or evaporative cooling stator windings have been applied in some generator units in China However, these cooling methods are still immature in design and construction experiences and unlikely to be expanded rapidly in application, so we haven’t introduced them into this standard in this revision This standard will replace GB 8564-1988 as of its effective date Appendix B, Appendix C and Appendix G of This standard are normative appendices Appendix A, Appendix D, Appendix E and Appendix F of This standard are informative appendices This standard are proposed and controlled by China Electricity Council Standardization Center The enterprises participating in the drafting of This standard include: China Gezhouba (Group) Corporation, China Water Conservancy and Hydropower Construction Corporation, China Yangtze Three Gorges Project Development Corporation, and Harbin Electrical Machinery Company Limited The main drafters of This standard include: Fu YuanChu, Zhang Ye, Wang LongQuan, Qin XiXiang, Liu YongDong, Zhao ShiRu, Li ZhengAn, Zhang YaoZhong, Du QiChen, Zhang LianBin, Zhao GuiShan, Xu GuangTao, Gong DePing, Want Tian, Yang XiYin, Huang HongYong, Zhang ChengPing, Liu YanHua, Jiang XiaoBin, Yin LongSheng, Liu ChanXue, and Tang WanBin China Electricity Council Standardization Center reserves the ultimate right for the interpretation of this standard GB/T8564-2003 Specification Installation of Hydraulic Turbine Generator Units Scope This standard describes the requirements on the installation, commissioning and test of hydraulic turbine generator units and their auxiliary equipment It is applicable for the installation and acceptance test of hydraulic turbine generator units satisfying one of the following conditions: a) Single unit capacity no smaller than 15MW; b) Reaction turbine, with the nominal diameter of runner no less than 1.5m; c) Mixed-flow turbine, with the nominal diameter of runner no less than 2.0m; d) Axial, diagonal or through flow turbine, with the nominal diameter of runner no less than 3.0m For the hydraulic turbine generator units of single-unit capacity smaller than 15MW and the generator units with turbine runner of nominal diameter less than the limits given in b), c) and d), This standard can serve as a reference This standard is also applicable for the installation and acceptance test of reversible pumped-storage generator units Normative References The terms in the following documents are becoming an integral part of this standard by quoting All the modifications (excluding corrigenda) or revisions following the quoted documents marked with date are not applicable for this standard However, the parties involved in the standard are encouraged to search for the possibility to apply the new versions of these quoted documents As for the quoted documents without marked with certain date, the latest versions shall be complied with for the standard GB/T 3323 Methods for radiographic inspection and classification of radiographs for fusion welded butt joints in steel GB/T 7409.3 Excitation system for synchronous electrical machines Technical requirements excitation system for large and medium synchronous generators GB/T 10969 Specifications for water passage components of hydraulic turbines GB 11120 LTSA turbine oil GB/T 11345 Method for manual ultrasonic testing and classification of testing results for ferritic steel welds GB/T 18482 Start-up test code for reversible pump-storage units GB 50150 engineering Standard for hand-over test of electric equipment electric equipment installation GB 50168 engineering Code for construction and acceptance of cable levels electric equipment installation GB 50171 Code for construction and acceptance of switchboard outfit complete cubicle and secondary circuit electric equipment installation engineering DL/T 507 unit Start-up test code for hydraulic-turbine and generator units hydraulic turbine generator DL/T 679 Code for welder technical qualification DL/T 827 Start-up test code for through flow type bulb turbine generator units JB/T 4709 Welding specification for steel pressure vessels JB/T 6204 Code for insulation resistance and withstanding voltage test of large-scale high-voltage AC generator’ stator JB/T 8439 Anti-corona technical requirement for high-voltage generator used at high altitude JB/T 8660 units Specification on packing, transportation and preservation of hydraulic turbine generator General 3.1 The hydraulic turbine generator unit shall be installed according to the installation drawings and relevant design documents for the generator unit reviewed and confirmed by the design division and the manufacturer, as well as the requirements specified in this standard In the case of any special requirements of the manufacturer, the requirements on the manufacturer’s relevant technical documents shall be complied with Supplemental provisions shall be made for the contents without requirements specified either in the standard or the manufacturer’s technical documents Should the manufacturer’s technical requirements conflict with the standard, generally the manufacturer’s requirements shall govern Otherwise, relevant agreement shall be reached with the manufacturer 3.2 Besides this standard, the relevant requirements given in the currently effective specifications on safety, environment protection and fire control etc issued by the state or relevant ministries shall also be complied with in the installation of generator units and their auxiliary equipment 3.3 The equipment of hydraulic turbine generator unit shall comply with the currently effective national technical standards and the requirements given in the purchase order After the equipment arriving at the destination, the installation enterprise can request to the owner for taking part in the open package inspection according to JB/T8660 The following documents shall serve as the base simultaneously for the installation and acceptance test of generator units and their auxiliary equipment: a) The instructions for equipment installation, operation and maintenance, and the relevant technical documents; b) All drawings and data provided along with the equipment (including the equipment assembly drawing and the constructional drawings of parts); c) Quality certificate, inspection and test records of the equipment; d) Material certificates for main parts 3.4 Prior to the installation of generator unit, the design drawings, delivery inspection record and relevant documents provided by the manufacturer shall be read carefully and familiarized, and reasonable construction organization design shall be made according to the actual construction situation 3.5 Prior to the installation of generator unit, the installation enterprise shall read the relevant civil design drawings related to the installation and participate in the acceptance test of the civil work handed over for installation Any found defects shall be removed before starting the installation 3.6 All materials used for the installation of hydraulic turbine generator unit shall meet the design requirements The inspection report and quality certificate shall be provided for main materials 3.7 The installation site shall be planned uniformly and shall meet the following requirements: a) The installation site shall be proof of wind, rain and dust The installation of generator unit can be started only after the roofs of workshop buildings in the generator unit section and the adjoining generator unit sections have been closed completely; b) The temperature at the installation site shall generally no lower than 50ºC, and the relative humidity of air no higher than 85%; The equipment and parts of special requirements on temperature, humidity or others shall be installed according to the design requirements; c) Adequate lighting shall be provided for the installation site; d) The installation site shall be supplied with facilities for construction safety protection The site for storing flammable or explosive articles shall comply with the relevant safety requirements; e) The installation shall be conducted according to the site regulations The installation equipment, instruments, tools and construction materials shall be stocked in order, the site shall be kept clean, the passage shall be kept unblocked and the site shall be cleaned off after work 3.8 Upon the completion of the installation of hydraulic turbine generator unit, trial run shall be conducted to comprehensively inspect the design, manufacture and installation quality of the generator unit according to the requirements given in the standard and DL/T 507 Following the passing of trial run, the acceptance test shall be carried out for the startup of generator unit, and relevant data shall be handed over referring to the requirement set forth in Appendix A General Requirements 4.1 General cleaning and inspection shall be conducted before installing the equipment The main dimensions and fitting tolerances of key parts shall comply with the drawing requirements and shall be checked with the factory records Records and relevant signatures shall be maintained for equipment inspection and defect treatment The supplied equipment delivered as assembled with the manufacturer’s quality warranty shall not be decomposed during the warranty period 4.2 The footplates of equipment foundation shall be embedded generally with the elevation deviation not exceeding -5mm~0mm, the deviation in center and position no more than 10mm, and the level deviation no more than 1mm/m 4.3 The embedded components shall be fixed reliably after being installed The foundation bolts, jacks, tensioners, wedge plates and foundation plates etc shall be fixed by spot welding The jointing planes between embedded components and concrete shall be free of oil stain or severe corrosion 4.4 The installation of anchor bolts shall meet the following requirements: a) The position of anchor bolt holes shall be correct, and the burr on the inner wall shall be cleaned off The deviation between the central line of bolt hole and that of foundation shall be no more than 10mm; The elevation and the depth of the bolt holes shall meet the design requirements; The vertical deviation of bolts hole wall shall be smaller than 10mm and no more than L/200 (L refers to the length of anchor bolt, mm, the same below); b) The center and elevation of the anchor bolts buried directly or with conduit into the second-phase concrete shall meet the design requirements The center deviation shall be no more than 2mm, the elevation deviation no more than mm~+3 mm, and the vertical deviation shall be smaller than L/450; c) In the case that preembedded reinforced steel is applied for the welding of screws on anchor bolts, the following requirements shall be satisfied: 1) The material of preembedded reinforced steel shall be consistent with that of anchor bolt; 2) The sectional area of preembedded reinforced steel shall be larger than that of anchor bolt, and the preembedded reinforced steel shall be vertical; 3) Should double side welding be applied between bolt and preembedded reinforced steel, the weld length shall not be smaller than times of anchor bolt diameter; In the case of single side welding, the weld length shall not be smaller than 10 times of anchor bolt diameter 4.5 The wedge plate shall be used in pairs and the jointing length shall be more than 2/3 For the wedge plates for bearing key components, 0.05mm feeler shall be used to check the contact after the installation The contacting length on each side shall not be more than 70% 4.6 The equipment can be installed only after the strength of foundation concrete reaches 70% of the designed value The second-phase concrete for foundation plates shall be laid densely and solidly 4.7 The jointing planes of equipment shall be smooth and free of burr The jointing gap shall be check with 0.05mm feeler that unable to pass through; the allowed local gaps shall be check with 0.10mm feeler that the depth shall not exceed 1-3 of the jointing width, and the overall length shall not exceed 20% of the perimeter; No gap is allowed around the jointing bolts or dowels The step on the installing plane of jointing seam shall not exceed 0.10mm 4.8 The fitting marks shall be noticed during the part assembling As multiple generator units are being installed, each generator unit shall be assembled with the parts marked with the same series number The numbering for the same type of parts or measuring points in the installation record shall start from +Y in clockwise sequence (seen from the end of generator, the same below) for stationary parts; or start from the position of No.1 pole of rotor in clockwise sequence (expect the measuring points on the shaft in turning, which is in anticlockwise sequence) for rotating parts; The consistency with the numbering rule of the manufacturer shall be checked 4.9 For the connecting bolts with pretightening force, the deviation in prestressing force shall not exceed ±10% of the specified value Without certain requirements specified by the manufacturer, the pretightening force shall not be smaller than times of the designed working pressure, but not exceeding 3/4 of the material yield strength As installing the connecting bolts with teeth, lubricant shall be applied on the thread; The connecting bolts shall be evenly tightened in times; sampling inspection (about 20%) shall be made at normal temperature for the heat-tightened bolts for checking the pretension After completing the installation of various parts, the dowel holes shall be bored and the dowels shall be fitted according to the design requirements The bolts, nuts and dowels shall be locked firmly as the design required 4.10 The general measurement on generator unit shall meet the following requirements: a) All measuring instruments shall have been qualified the regular inspection and calibration conducted by authorized metering organization b) The error in X and Y reference axes and reference elevation point for the installation of generator unit shall not exceed ±1mm by contrast with the workshop benchmark; c) The measurement error in the elevation difference of various parts shall not exceed ±0.5mm; d) The measurement error in level shall not exceed 0.02mm/m; e) The diameter of the steel wire used for center measurement is generally ranged between 0.3mm-0.4mm, and the tensile stress shall be no less than 1200MPa; f) No matter which method is applied for measuring the center or roundness of generator unit, the measurement error shall normally no more than 0.05mm; g) The impact of temperature change on the measurement precision shall be taken into consideration The measured values shall be corrected according to the temperature change 4.11 In the hydrostatic pressure test for measuring the strength of site-made bearing equipment and connectors, the test pressure shall be 1.5 times of the rated working pressure, but the minimum pressure shall not be smaller than 0.4MPa Maintain the test pressure for 10min, and no defects like leakage or crack shall occur In the tightness breakdown test of the equipment and connectors, the test pressure shall be l.25 times of the actual working pressure and maintained for 30min, no leakage shall occur In the tightness test, the test pressure shall be the actual working pressure and maintained for hours, no leakage shall occur Hydrostatic pressure test shall be conducted for single cooler at the designed test pressure Without relevant specification in the design, the test pressure shall be normally times of the working pressure, but no lower than 0.4Mpa Maintain the test pressure for 30min, no leakage shall occur APPENDIX A (Informative appendix) List of Hand-over Documentation A.1 As-built drawings and data a) As-built drawings for the installation in the scope specified in the standard; b) Delivery records, certificates, technical specifications etc supplied along with the goods; c) Design modification documents; d) Summary of troubleshooting measures for main equipment, and technical data related to troubleshooting A.2 Installation and test records a) Turbine 1) Installation record of draft tube (elbow and cone) liner; 2) Installation record of stay ring; 3) Installation record of spiral case; 4) Weld examination record of spiral case; 5) On-site hydrostatic test record of spiral case; 6) Installation record of servomotor; 7) Annealing and examination record of welds on sectioned runner; 8) Assembly record of sectioned runner (after annealing); 9) Static balancing test record of runner; 10) Roundness record of upper and lower wearing rings on the monolithic runner; 11) Welding, annealing and fabrication acceptance test record for the monolithic runner to be assembly-welded on the site; 12) Assembly and installation record of bottom ring; 13) Assembly and installation record of head cover; 14) Clearance record between the upper/lower ends and the vertical surface of guide vane; 15) Distance record between the two axle holes in guide vane link; 16) Pressing stroke record of guide vane servomotor; 17) Maximum opening record of guide vane, rotary angle scope record of propeller blade; 18) Clearance record between various wearing rings of turbine; 19) Installation clearance record of guide bearing; 20) Installation record of cylinder valve; 21) Installation record of air replenishing device at the central hole of main shaft: 22) Installation record of runner chamber for turbine with adjustable blade propeller; 23) Runner operation and voltage withstanding test record of turbine with adjustable blade propeller; 24) Relation curve of rotary angle of blade versus the servomotor stroke on turbine with adjustable blade propeller; 25) Clearance record between blade and runner chamber of turbine with adjustable blade propeller; 26) Installation record of oil head; 27) Installation record of reaction turbine housing; 28) Installation record of reaction turbine nozzle; 29) Relation record between needle stroke and deflector opening of reaction turbine; 30) Voltage withstanding test and action test record of diagonal turbine runner; 31) Clearance record between runner blade and runner chamber of diagonal turbine; 32) Relation curve between rotary angle of blade and servomotor stroke of diagonal turbine b) Speed-governing system 1) Tightness breakdown test record on pressure vessels, oil pipelines and loading elements; 2) Trial run test of oil pressure unit; 3) Emergency shutdown and startup time record of guide vane; 4) Stroke and time record of guide vane in sectioned closing; 5) Emergency closing and opening record of impeller blade; 6) Time record of emergency control valve closing guide vane; 7) Record of comprehensive drift experiment; 8) Relation curve of guide vane opening versus servomotor stroke, relation curve of propeller blade angle versus servomotor stroke; 9) Relation curve of the stroke of guide vane servomotor versus the stroke of impeller blade servomotor under designed water head; 10) Relation curves between the input rotational speed of speed detector and output voltage and current; 11) Static characteristic curve of electro-hydraulic or electro-mechanical switching device; 12) Static characteristic curve of speed-governing system c) Generator 1) Frame assembly record; 2) Inspection record of frame welds; 3) Frame installation record; 4) Gap record of joints between stator pedestal and iron core; 5) Stator installation record; 6) On-site closed assembly record of stator; 7) Assembly record of rotor field spider; 8) Inspection record of welds on rotor field spider; 9) Assembly record of rotor magnetic yoke; 10) Installation record of braking ring plate; 11) Installation record of magnetic pole; 12) Weight balancing record of rotor; 13) Assembly clearance record of thrust bearing shoe; 14) Stress adjustment record of thrust bearing; 15) Distance record between elastic bearing pedestal and mirror plate; 16) Distance record between journal and guide bearing shoe support; 17) Air gap record of stator and rotor; 18) Axes adjustment record of generator unit; 19) Clearance record of guide bearing shoe; 20) Voltage withstanding test record of braking device; 21) Installation elevation record of braking device; 22) Insulation resistance measurement record of bearing; 23) Voltage withstanding test record of cooler; 24) Pressure test record of high-pressure oil lifting device; 25) Installation record of bearing in horizontal frame; 26) Installation record of tubular saddle in bulb generator unit; 27) Installation record of vertical and horizontal supports in bulb generator unit d) Excitation system 1) Installation record of panels and cabinets in excitation system; 2) Installation and test record of exciting transformer; 3) Installation and test record of field circuit breaker; 4) Installation and test record of large power rectifier; 5) Installation and test record of pulse transformer; 6) Nonlinear resistance test record; 7) Installation and test record of silicon controlled bridge; 8) Cable laying and wiring record for panels, cabinets and parts in excitation system; 9) Inspection records of elements in the circuits of excitation system, including operation, maintenance, monitor, signal, and interface; 10) Test record of circuits in excitation system, including operation, protection, monitor, signal and interface; 11) Insulation inspection record of primary and secondary circuits in excitation system; 12) Dielectric strength test record of various parts in excitation system; 13) Test record of various basic units in automatic excitation regulator; 14) Test record of various auxiliary units in automatic excitation regulator; 15) Overall static characteristics test record of automatic excitation regulator; 16) Refer to A.2.h) for trial run of excitation system e) Butterfly valve and globe valve 1) Installation record of valve body; 2) Voltage withstanding test record of rubber water seal; 3) Clearance record of antipriming; 4) Hydrostatic test record of bypass valve; 5) Servomotor stroke record; 6) servomotor installation record of ; 7) Operation record under no-water or static water conditions; 8) Inspection record of welds on expansion joint f) Others 1) Elongation record of bolts with tightness requirements; 2) Oil quality analysis record; 3) Test record of air, water and oil system g) Electrical part of generator unit Electrical test record shall be made according to the requirements of this standard h) Trial run Test record shall be made according to the requirements of this standard APPENDIX B (Normative appendix) Installation requirements of mechanical hydraulic governor B.1 The installation deviation of governor cabinet shall meet the requirements given in Table B.1 Table B.1 Installation tolerance of governor cabinet No Item Tolerance Notes Center, mm To measure the distance from the mark on the equipment to the X and Y reference lines of the unit Elevation, mm ±5 Levelness of mechanical cabinet, mm/m 0.15 To measure the pedestal of pendulum motor (upper clapboard) Note: The combined governor shall be installed referring to the driving gear support of regulating shaft, and the tolerance shall meet the design requirements B.2 The cleaning, assemble and adjustment of governor parts shall meet the following requirements: a) The coupling between the pendulum motor and the eccentric pendulum shall be concentric, and rotate smoothly The swing of spring pedestal of lozenge eccentric pendulum shall not exceed 0.04mm either axially or radially against the upper support of steel band b) As the piston of buffer moving up and down, the time needed to pass the last 1mm for resetting to the middle position shall meet the design requirements; the difference between moving up and down to rest shall not exceed 10% of the setting time Measure the resetting time of buffer bearing plate in the governor starting from the middle point and two ends respectively No gaps shall remain between the buffer supporting screws and the bearing plate The relay piston of buffer shall act stably, and the deviation of its resetting to the middle position shall generally not exceed 1mm c) The indicators and levers in the governor mechanical cabinet shall be adjusted according to the relevant drawing The position deviation of the mechanism shall not exceed 1mm; d) As the permanent speed droop (residual unbalancing disequilibrium degree) pointing to zero, the reset mechanism shall act for a full stroke and the stroke of the droop mechanism shall be zero, with the maximum deviation no more than 0.05mm B.3 Refer to relevant contents in Chapter for others APPENDIX C (Normative appendix) Requirements on the drying of hydraulic turbine generator stator C.1 No drying is required if the stator winding meets the following conditions: a) The insulation resistance at each phase of winding shall meet the requirements given in 9.3.18 a); b) At a temperature below 40℃, the measured insulation resistance absorption ratioR60/R15, shall be no less than 1.3 for asphalt-mica insulation, and no less than 1.6 for epoxy-mica insulation; the measured polarization index R10min/R1min of insulation shall not be less than C.2 For the stator required to be dried, the following items shall be noted as drying: a) The assembled stator shall be dried by surface baking with external heating; b) As drying the stator winding, the temperature shall rise gradually, generally 5K~8K rise per hour;; c) The highest temperature of winding shall not exceed 70℃ if measured with alcohol thermometer; and not exceed 80℃ if measured with embedded resistance thermometer; d) The insulation resistance shall normally be kept stable for 4h~8h APPENDIX D (Informative appendix) Pickling, Passivation and Rinsing of Pipe D.1 Pickling and passivation of pipe a) Before installing the pipe, pickling and passivation shall be conducted for the inner wall by means of vat leaching or system circulation; b) The pickling of pipe inner wall shall remove any rust corroded parts, and ensure not to damage the rust-free metal surfaces (i.e over-pickling); c) If there are obvious oil stains on the pipe inner wall, degreasing treatment shall be carried out before pickling despite of the pickling method; organic solvents (dichloroethane, trichloroethane, carbon tetrachloride and industrial alcohol etc), aqua fortis or alkaline liquor can be applied for degreasing the pipe wall; d) Before pickling by system circulation, air leakage test or water leakage test shall be conducted on the pipe system; e) For the pickling by system circulation, the general procedure sequence shall be leakage test, degreasing (if required), rinsing, pickling, neutralization, passivation, rinsing, drying, oil painting, and resetting; f) The concentration and temperature of the acid solution shall be kept constant during pickling; g) The proportioning of solutions for pickling, neutralization and passivation of steel pipe, if no requirements specified in the design, shall apply those qualified in trial test and proved to be effective and reliable by practical application and confirmed; h) Visual appearance examination shall be conducted on the pipe after pickling The inner wall with metallic luster shall be considered qualified i) During the pickling, neutralization and passivation operation for steel pipe, the operators shall wear safety ware like special protective clothing, goggles, and acid resistant gloves; j) The pipe qualified in pickling, neutralization and passivation shall be sealed for protection if unable to be reinstalled or put into operation immediately; k) The waste water and exhaust liquid after pickling shall be treated before discharging to meet the relevant regulations on environmental protection and prevent environment pollution D.2 Pipe rinsing D.2.1 Rinsing of water system pipe a) The parts inside the pipe system, e.g orifice plate, strainer, thermometer, and valve core of check valve, shall be removed before rinsing, and reassembled after qualified rinsing; b) The rinsing shall be conducted at the possible maximum pressure and flow of the system the rinsing shall not be qualified until the water color and transparency at the outlet are visually examined to be similar to those at the inlet D.2.2 Rinsing of gas system pipe a) The gas system pipe is normally purged by compressed air at the flow rate ranged in 5m/s~10m/s Placing a plate attached with a piece of white paper or white cloth at the air outlet for 3min~5min, the rinsing is qualified if no dirt or water can be found on the paper/cloth; b) The gas system pipe can also be rinsed by water at the flow rate 0.8m/s until the water at outlet becomes clean The pipe can be put into operation after being dried by air blowing after water rinsing D.2.3 Rinsing of oil system pipe a) After the qualified pickling and before filling with oil, the oil pipe shall be rinsed by the oil that filtered through oil filter press and pumped into by oil pump; b) Oil rinsing shall be conducted by oil circulation During the oil circulation, the oil temperature should rise and fall within the range of 40℃-70℃ for two to three times in every hours; c) After oil rinsing, the pipe shall be examined by a strainer of 200 mesh The dirt residues remained in every square centimeter shall not be more than particles; d) The rinsing oil shall be of the same grade to the oil used in the system New oil can be filled in the system only after the oil rinsing has been confirmed to be qualified and all rinsing oil has been discharged D.2.4 The rinsing of speed-governing system pipe shall be carried out according to the design requirements APPENDIX E (Informative appendix) Standards Related to Nondestructive Inspection of Welds E.1 Abstract of the standard GB/T3323-1987 Methods for radiographic inspection and classification of radiographs for fusion welded butt joints in steel E.1.1 Welds are classified into four grades based on the weld quality and quantity: a) Grade I: free of crack, fusion, through welding or liquid carryover strips in the weld; b) Grade II: free of crack, fusion or through welding in the weld; c) Grade III: No crack or fusion in the weld; and no through welding in both sides welding and single side welding added with back plate The allowed unpenetrated length in the case of single side welding without back plate shall be rated according to the Grade III criteria for length of slag stringer stipulated in Table E.5; d) All weld defects more than Grade III are Grade IV E.1.2 Weld defects can be round defects or slag stringer E.1.3 The defects with the length/width ratio smaller than or equal to are round defects Circular defects may be round, ellipse or cone, also irregular shapes with tails (which shall be included into the measured size), including pore, slag blister and tungsten inclusion E.1.3.1 Circular defects shall be rated by means of area of interest Area of interest shall be selected in the severest part See Table E.1 for the size of area of interest Table E.1 Area of Interest of Circular Defects unit: mm Thickness of base material T2~3 >3~4 >4~6 >4~8 >8 Points 10 15 25 E.1.3 See Table E.3 for the defect dimensions not considering the point numbers Table E.3 Defect Dimensions not Considering the Point Numbers unit: mm Thickness of base material, T Larger diameter of defect T≤25 25 50 15 50≥T>25 100≥T>50 T>100 I II 12 15 18 III 12 18 24 30 36 IV The number of defect points exceeds the limit for Grade III E.1.4 The slag blister with the length/width ratio of the defect more than is slag stringer See Table E.5 for the rating of slag stringer Table E.5 Rating of Slag Stringer unit: mm Quality grade Length of single slag stringer Total length of slag stringer II when T≤12; On a random straight line, select a random group of slag blisters with the distance between two neighboring slag blisters no exceeding 6L, the overall length of slag blisters in the length of 12T doesn’t exceed T 1/3T when 12
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