Standard No.:	NB/T 47044-2014
English Name:	Power station valves
Chinese Name:	电站阀门
Professional Classification:	NB    Professional Standard - Energy
Source Content Issued by:	National Energy Administration
Issued on:	2014-06-29
Implemented on:	2014-11-1
Status:	valid
Superseding:	JB/T 3595-2002 Valves for power station-general requirements
Target Language:	English
File Format:	PDF
Word Count:	73500 words
Translation Price(USD):	2205.0
Delivery:	via email in 1 business day

NB/T 47044-2014 Valves for power station 1 Scope 1.1 This standard specifies the requirements for valves for power station in terms of pressure-temperature ratings, general requirements, ordering requirements, design and manufacture, materials, welding, heat treatment, repair, inspection, testing, marking, painting, delivery, packaging, delivery documents, valve installation and commissioning, quality assurance, environmental protection, etc. 1.2 This standard applies to the design, manufacture and acceptance of cast, forged and fabricated valves with flanged, threaded and welding end connections. It covers steel valves and nickel‑based alloy valves for thermal power generating units, such as globe valves, gate valves, isolation valves, check valves, safety valves, relief valves, control valves, pressure reducing valves, steam converting valves, throttle valves, feed distribution valves, blow-down valves, quick opening and closing valves, butterfly valves, ball valves, circulating pump outlet valves, blocking valves, high-pressure heater three-way valves, and extraction check valves, applicable to ultra (super) critical and lower parameter conditions. a) PN designation: ——Nominal pressure ≤ 80MPa; maximum working temperature ≤ 430°C; ——Working pressure ≤ 35MPa; maximum working temperature ≤ 625°C; ——Working pressure ≤ 8MPa; maximum working temperature ≤ 648°C. b) Class designation: ——Pressure classes ranging from Class 150 to Class 4500. 1.3 This standard may also be referenced for valves applied to units with alternative steam parameters, industrial boilers, heat recovery boilers and other special equipment. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 150 (all parts) Pressure vessels GB/T 152.4 Fasteners - Counterbores for hexagon bolts and nuts GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 197 General purpose metric screw threads - Tolerances GB/T 699 Quality carbon structural steels GB/T 711 Hot-rolled quality carbon structural steel plates and wide strips GB 713 Steel plates for boilers and pressure vessels GB/T 984 Hardfacing electrodes for shielded metal arc welding GB/T 1047 Pipework components - Definition and selection of DN (nominal size) GB/T 1184 Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indications GB/T 1220 Stainless steel bars GB/T 1221 Heat-resistant steel bars GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 1972 Disc spring GB/T 2100 Corrosion-resistant steel castings for general applications GB/T 3077 Alloy structure steels GB/T 4237 Hot rolled stainless steel plate, sheet and strip GB/T 4622 (all parts) Spiral wound gaskets GB/T 5796 (all parts) Trapezoidal screw threads GB/T 6414 Castings - System of dimensional tolerances and machining allowances GB/T 6567.4 Technical drawings - Graphical symbols for piping systems - Valves and control components GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes GB/T 7233.2 Steel castings - Ultrasonic examination - Part 2: Steel castings for highly stressed components GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 9113 Integral steel pipe flanges GB/T 9124 Specification for steel pipe flanges GB/T 9125 Fasteners for pipe flange joints GB/T 10869 Control valves for power station GB/T 11351 Mass tolerances for castings GB/T 11354 Determination of nitrided case depth and metallographic microstructure examination for steel and iron parts GB/T 12220 General purpose industrial valves - Marking GB/T 12221 Metal valves - Face to face, end to end, center to face and center to end dimensions GB/T 12222 Multi-turn valve actuator attachments GB/T 12223 Part-turn valve actuator attachments GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings GB/T 12229 General purpose industrial valves - Specification of carbon steel castings GB/T 12230 General purpose industrial valves - Specification of stainless steel castings GB/T 12241 Safety valves - General requirements GB/T 12243 Spring loaded safety valves GB/T 12244 General requirements for pressure reducing valves GB/T 12245 Methods of performance test for pressure reducing valves GB/T 12246 Pilot operated pressure reducing valves GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads GB/T 13402 Large diameter steel pipe flanges GB/T 15056 Evaluation method on cast surface roughness GB/T 16253 Steel castings for pressure purposes GB/T 17854 Stainless steel electrodes and fluxes for submerged arc welding GB/T 19066 (all parts) Flexible graphite covered wave-serrated metal gaskets GB/T 19675 (all parts) Flexible graphite gaskets reinforced with tanged metal sheet for pipe flanges GB/T 21465 Terminology of valves GB/T 21469 Machining allowances and tolerances for steel open die forgings on hammer - General requirement GB/T 22652 Overlaying-welding procedure qualification for valves sealing face GB/T 23934 Hot coiled helical compression springs - Technical specifications GB/T 23935 Design of cylindrical helical springs GB/T 24919 Installation, operation, maintenance of industrial valves - General requirements GB/T 24922 Technical specifications of explosion-proof version electric valve actuators GB/T 24923 Technical specifications of basic version electric valve actuators GB/T 26480 Valve inspection and testing GB/T 28270 Intelligent valve electric actuator GB/T 29462 Isolation valve for power station DL/T 439 The technical guide for high-temperature bolt of fossil-fired power plant DL/T 641 Electric valve actuators for power plant DL/T 746 Guide on selection of butterfly valves for power plant DL/T 748.3 Guide of maintenance of boiler unit for thermal power station - Part 3: The maintenance of valves and steam-water system DL/T 959 Guide of safety valves for power station boilers JB/T 79 (all parts) Integral cast steel pipe flanges JB/T 81 Slip-on-welding plate steel pipe flanges with male face JB/T 82.1 Steel pipe welding neck flanges with male face JB/T 82.2 Steel pipe welding neck flanges with male and female face JB/T 106 Valves marking and paint JB/T 2203 Center-to-face dimensions of spring loaded safety valve JB/T 2205 Reducing pressure valve - Face-to-face dimensions JB/T 2769 Components of valves - High pressure threaded flanges JB/T 3168 (all parts) Alloy powder for welding JB/T 4730.2 Nondestructive testing of pressure equipments - Part 2: Radiographic testing JB/T 4730.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing JB/T 4730.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing JB/T 4730.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing JB/T 5263 Specification for steel casting for power station valves JB/T 6439 Methods of magnetic examination for valves JB/T 6440 Methods of radiographic examination for steel castings valves JB/T 6617 Specification of flexible graphite ring for valves JB/T 6902 Methods for liquid penetrant examination of valves JB/T 6903 Methods for ultrasonic examination of steel forging for valves JB/T 7370 Flexible graphite braided packing JB/T 7746 Compact steel valves JB/T 7927 Valve cast steel visual quality requirements JB/T 7928 General purpose industrial valves - Delivery specification JB/T 8531 Specifications of manual valve actuators JB/T 9624 Specification for safety valve of fossil power station JB/T 9625 Specification for pressure retaining casting of boiler pipe fittings JB/T 9626 Specification for boiler forging NB/T 47008 Carbon and alloy steel forgings for pressure equipments NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments NB/T 47014 Welding procedure qualification for pressure equipment NB/T 47018 (all parts) Technical permission of welding materials for pressure equipment NB/T 47028 Nickel and nickel alloy forgings for pressure vessels NB/T 47033 Attemperating and pressure reducing devices NB/T 47037 Methods for model compositing of power station valves ASME B16.5-2013 Pipe flanges and flanged fittings NPS 1/2 through NPS 24 metric/inch standard ASME B16.47-2011 Large diameter steel flanges NPS 26 through NPS 60 standard ASTM A105/A105M-2012 Standard specification for carbon steel forgings for piping applications ASTM A182/A182M-2013 Standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature service ASTM A193/A193M-2011 Standard specification for alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications ASTM A194/A194M-2012 Standard specification for carbon and alloy steel nuts for bolts for high pressure or high temperature service, or both ASTM A216/A216M-2008 Standard specification for steel castings, carbon, suitable for fusion welding, for high-temperature service ASTM A217/A217M-2011 Standard specification for steel castings, martensitic stainless and alloy, for pressure-containing parts, suitable for high-temperature service ASTM A240/A240M-2012 Standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications ASTM A351/A351M-2012 Standard specification for castings, austenitic, for pressure-containing parts ASTM A387/A387M-2010 Standard specification for pressure vessel plates, alloy steel, chromium-molybdenum ASTM A515/A515M-2010 Standard specification for pressure vessel plates, carbon steel, for intermediate- and higher-temperature service ASTM B424/B424M-2009 Standard specification for Ni-Fe-Cr-Mo-Cu alloy (UNS N08825 and UNS N08221) plate, sheet, and strip ASTM B564/B564M-2011 Standard specification for nickel alloy forgings ASTM B637/B637M-2012el Standard specification for precipitation-hardening and cold worked nickel alloy bars, forgings, and forging stock for moderate or high temperature service EN 10028-2:2009 Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties TSG D2001 Pressure pipe unit manufacture appraisal regulation TSG D7002 Pressure piping components type test regulation TSG ZF001 Safety technical supervision regulations for safety valves TSG G0001 Boiler safety technical supervision administration regulation 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 21465 and the following apply. 3.1 pressure-temperature rating maximum allowable working pressure, expressed in gauge pressure, at the specified working temperature for the selected materials, indicated by a pressure class 3.2 maximum allowable working pressure (MAWP) maximum pressure (gauge pressure) that a valve can withstand at the specified design temperature, which is the initial pressure for overpressure limitation 3.3 bare maximum continuous pressure rating rule for determining pressure-temperature ratings, which is the maximum pressure that a material can withstand at the specified temperature, including limitations on material stress 4 Order requirements The order contract shall contain sufficient information for the manufacturer to define the valve types, design conditions and technical requirements, including at minimum pressure, temperature, nominal size and connection mode of the valves. PN designated valves shall be ordered by PN pressure class and DN, while Class designated valves shall be ordered by Class pressure class and NPS. The ordering of valves shall comply with the provisions of Annex A. Where necessary, the relevant provisions in applicable European and American standards may be adopted as the special requirements of this standard and shall be incorporated into the order contract. 5 General requirements 5.1 Qualification 5.1.1 The valve manufacturer shall hold a manufacturing license for pressure piping components of special equipment. 5.1.2 Manufacturers of safety valves and electromagnetic relief valves shall hold a manufacturing license for safety accessories and safety protection devices of special equipment. 5.1.3 Personnel engaged in welding and nondestructive testing of pressure piping components of special equipment, as well as valve operation personnel and safety valve commissioning personnel, shall acquire corresponding qualification certificates for special equipment.

Contents Foreword i Introduction iv 1 Scope 2 Normative references 3 Terms and definitions 4 Order requirements 5 General requirements 6 Pressure-temperature rating 7 Design and manufacture 8 Materials 9 Welding 10 Heat treatment 11 Repair 12 Examination, inspection, and test 13 Marking 14 Painting, packaging, delivery, storage and transport 15 Delivery documents 16 Quality assurance 17 Environmental protection 18 Installation, commissioning and maintenance Annex A (Informative) Valve ordering data sheet Annex B (Normative) Unit conversion Annex C (Normative) Pressure-temperature ratings of PN designated valves Annex D (Normative) Pressure-temperature ratings of Class designated valves Annex E (Informative) Methods for determination of pressure-temperature ratings and calculation of intermediate interpolation Annex F (Informative) Parameters of boilers and steam turbines for power station Annex G (Informative) Relationship between nominal size and valve inside diameter Annex H (Normative) Basic equation for determination of minimum wall thickness Annex I (Informative) Specifications for welding groove of body Annex J (Informative) Face-to-face dimensions Annex K (Normative) Temperature limit of pressure-containing part materials Annex L (Informative) Overlay welding materials, hardness and welding methods for valve sealing faces Annex M (Normative) Allowable stress of materials Annex N (Informative) Average linear expansion coefficient and elastic modulus of metallic materials Annex O (Informative) Material marking code Annex P (Informative) Metal nameplate Annex Q (Informative) Valve product certificate Figure 1 Name of each part of the body Figure 2 Schematic diagram of typical body structure and minimum wall thickness Figure 3 Wall thickness of the body neck Figure 4 Wall thickness of the body neck when d/d'≥4 Figure 5 Structure and dimensions of butterfly valve body Figure 6 Inclination between the end face of the body groove and the centerline of the connecting pipe Figure 7 Sizes of the socket welding end and the threaded end Figure 8 Type of auxiliary connecting parts Figure 9 Thread length of auxiliary connection Figure 10 Socket welding of auxiliary connection Figure 11 Butt welding of auxiliary connection Figure 12 Boss of auxiliary connection Figure 13 Schematic diagram for position of auxiliary connecting parts Figure 14 Flat gate valve body (pressure self‑seal bonnet) Figure 15 Gate valve body (pressure self‑seal bonnet) Figure 16 Globe valve body (flanged bonnet) Figure 17 Y-pattern globe valve body (packing bonnet) Figure 18 Trumpet valve body (packing bonnet) Figure 19 Downward bent valve body (packing bonnet) Figure 20 Disc valve body Figure 21 Plug valve body Figure 22 Ball valve body Figure 23 Split‑type ball valve body Figure 24 Disc‑shaped bonnet Figure 25 Flat bonnet Figure 26 Radiographic range of the groove Figure 27 Schematic diagram of valve marking positions Figure E.1 Linear interpolation graph of pressure-temperature Figure E.2 Linear interpolation graph of pressure class - diameter - wall thickness Figure I.1 V-pattern groove type Figure I.2 U-pattern groove type Figure I.3 U1-pattern groove type Table 1 Provisions for the value of Pc Table 2 Additional allowance C Table 3 Minimum body wall thickness for PN designated valves Table 4 Minimum body wall thickness for Class designated valves Table 5 Inclination △f between the valve end and the centerline of the connecting pipe Table 6 Minimum wall thickness of PN designated valves with socket welding and thread connections Table 7 Minimum wall thickness of Class designated valves with socket welding and threaded connections Table 8 Relationship between the specifications of auxiliary connecting parts and the nominal sizes of valves Table 9 Difference between the maximum and minimum inside diameters of the body rolled from steel plates at the same cross-section Table 10 Requirements for the roughness of the sealing face Table 11 Recommended minimum wear stroke of the sealing face of the wedge gate plate Table 12 Quality requirements for threads Table 13 Common materials of pressure-containing parts Table 14 Common materials of stems Table 15 Common materials of bolts Table 16 Permissible residual height values for castings Table 17 Technical requirements for surface treatment of common materials Table 18 Items for end-of-manufacturing test and type test of valve Table 19 Applicability of nondestructive testing methods Table 20 Test duration Table A.1 Basic ordering requirements Table A.2 Special ordering requirements Table B.1 General conversion and error of minimum thickness and radius values Table B.2 Conversion of nominal size DN to nominal pipe diameter NPS Table B.3 Conversion between Fahrenheit and Celsius Table B.4 Unit conversion of pressure Table B.5 Unit conversion of material properties Table B.6 Exact conversion method Table C.1 Pressure-temperature ratings of materials 25 and ZG230-450 Table C.2 Pressure-temperature ratings of materials 15CrMo and ZG20CrMo Table C.3 Pressure-temperature ratings of materials 12Cr5Mo and ZG1Cr5Mo Table C.4 Pressure-temperature ratings of materials 12Cr1MoV, 15Cr1Mo1V, ZG15Cr1Mo1V and ZG20CrMoV Table D.1A Pressure-temperature ratings (standard pressure class) of materials A105 and WCB Table D.1B Pressure-temperature ratings (special pressure class) of materials A105 and WCB Table D.2A Pressure-temperature ratings (standard pressure class) of material WCC Table D.2B Pressure-temperature ratings (special pressure class) of material WCC Table D.3A Pressure-temperature ratings (standard pressure class) of materials F36 Cl.2 and WB36 Table D.3B Pressure-temperature ratings (special pressure class) of materials F36 Cl.2 and WB36 Table D.4A Pressure-temperature ratings (standard pressure class) of material WC1 Table D.4B Pressure-temperature ratings (special pressure class) of material WC1 Table D.5A Pressure-temperature ratings (standard pressure class) of materials F11 Cl.2 and WC6 Table D.5B Pressure-temperature ratings (special pressure class) of materials F11 C1.2 and WC6 Table D.6A Pressure-temperature ratings (standard pressure class) of materials F22 C1.3 and WC9 Table D.6B Pressure-temperature ratings (special pressure class) of materials F22 Cl.3 and WC9 Table D.7A Pressure-temperature ratings (standard pressure class) of materials F5a and C5 Table D.7B Pressure-temperature ratings (special pressure class) of materials F5a and C5 Table D.8A Pressure-temperature ratings (standard pressure class) of materials F91 and C12A Table D.8B Pressure-temperature ratings (special pressure class) of materials F91 and C12A Table D.9A Pressure-temperature ratings (standard pressure class) of material F92 Table D.9B Pressure-temperature ratings (special pressure class) of material F92 Table D.10A Pressure-temperature ratings (standard pressure class) of materials F304, CF8, F304H and CF10 Table D.10B Pressure-temperature ratings (special pressure class) of materials F304, CF8, F304H and CF10 Table D.11A Pressure-temperature ratings (standard pressure class) of materials F316, CF8M, F316H and CF10M Table D.11B Pressure-temperature ratings (special pressure class) of materials F316, CF8M, F316H and CF10M Table D.12A Pressure-temperature ratings (standard pressure class) of material F321H Table D.12B Pressure-temperature ratings (special pressure class) of material F321H Table D.13A Pressure-temperature ratings (standard pressure class) of material F347H Table D.13B Pressure-temperature ratings (special pressure class) of material F347H Table D.14A Pressure-temperature ratings (standard pressure class) of material F310H Table D.14B Pressure-temperature ratings (special pressure class) of material F310H Table D.15A Pressure-temperature ratings (standard pressure class) of material CH20 Table D.15B Pressure-temperature ratings (special pressure class) of material CH20 Table D.16A Pressure-temperature ratings (standard pressure class) of material CK20 Table D.16B Pressure-temperature ratings (special pressure class) of material CK20 Table D.17A Pressure-temperature ratings (standard pressure class) of materials N06022, N06625 and N08825 Table D.17B Pressure-temperature ratings (special pressure class) of materials N06022, N06625 and N08825 Table E.1 Maximum limit of pressure ratings for Class designated valves (standard pressure class) Table E.2 Maximum limit of pressure ratings for Class designated valves (special pressure class) Table E.3 Maximum limit of pressure ratings for PN designated valves Table F.1 Pressure of boilers and rated power of steam turbines Table F.2 Pressure, temperature and temperature deviation of boilers Table F.3 Recommended flow rates of main pipeline media in boilers Table G.1 Relationship between nominal size and inside diameter Table H.1 Basic calculation equations for determination of minimum wall thickness (metric units) Table H.2 Basic calculation equations for determination of minimum wall thickness (imperial units) Table I.1 Size (D2) of butt weld groove for I designated steel pipes Table I.2 Size (D2) of butt weld groove for II designated steel pipes Table J.1 Face-to-face dimensions of globe valves Table J.2 Face-to-face dimensions of gate valves Table J.3 Face-to-face dimensions of check valves Table K.1 Temperature limit of forging materials Table K.2 Temperature limit of cast steel materials Table L.1 Overlay welding materials, hardness and welding methods for valve sealing faces Table M.1 Allowable stresses of common forgings for valves Table M.2 Allowable stresses of common steel castings for valves Table N.1 Total expansion amounts of common metallic materials Table N.2 Average linear expansion coefficient of common metallic materials Table N.3 Elastic modulus of common metallic materials Table O.1 Material marking codes Table P.1 Metal nameplates of globe valves, gate valves, check valves, blind valves, throttle valves, blow-down valves and ball valves Table P.2 Metal nameplates for safety valves and electromagnetic relief valves Table P.3 Metal nameplate of regulating valve Table P.4 Metal nameplate of pressure reducing valve Table P.5 Metal nameplate of steam converting valve Table P.6 Metal nameplate for attemperating and pressure reducing device Table Q.1 Valve product certificate