1 Scope
This standard specifies pressure-temperature ratings, materials, design requirements, inspection and test, marking and requirements for steel valves of special pressure class and limited pressure class.
This standard applies to valves, the pressure containing parts of which are made of materials as listed in Tables 1A and 1B, the valve body of which is processed by means of casting, forging, rolling and assembly welding, and the installation of which adopts flanged, threaded and welded connection, as well as wafer type and single flange type. This standard covers valves with nominal pressures of Class series and PN series. The parameter range of steel valves applicable to this standard is as follows:
a) For Class series valves, the pressure class applicable ranges from Class150 to Class 4500, of which Class 4500 is only applicable to welded valves; for PN series valves, the pressure class applicable ranges from PN2.5 to PN 400;
b) The nominal diameter of flanged valve is not greater than DN1250;
c) The nominal diameter of socket weld valve and threaded valve is not greater than DN65;
d) The rated temperature of threaded valve is not higher than 538°C, and the pressure class is not more than Class 2500;
e) Flanged valves are only applicable to standard pressure class, not to valves of special pressure class and limited pressure class;
f) Flanged valves do not have intermediate pressure class.
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.
GB150.1 Pressure vessels—Part 1: General requirements
GB150.2 Pressure vessels—Part 2: Materials
GB150.3-2011 Pressure vessels—Part 3: Design
GB150.4 Pressure vessels—Part 4: Fabrication, inspection and testing, and acceptance
GB/T 196 General purpose metric screw threads—Basic dimensions
GB/T 197 General purpose metric screw threads—Tolerances
GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1: Method of test at room temperature
GB/T 699 Quality carbon structure steels
GB/T 700-2006 Carbon structural steels
GB/T 711-2008 Hot-rolled quality carbon structural steel plates, sheets and wide strips
GB713-2014 Steel plates for boilers and pressure vessels
GB/T 1047 Pipework components—Definition and selection of DN (nominal size)
GB/T 1048 Pipework components—Definition and selection of PN (nominal pressure)
GB/T 1220-2007 Stainless steel bars
GB 3531-2014 Steel plates for low temperature pressure vessels
GB/T 4237-2015 Hot rolled stainless steel plate, sheet and strip
GB 5310-2008 Seamless steel tubes and pipes for high pressure boiler
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 8163-2008 Seamless steel tubes for liquid service
GB/T 9113 Integral steel pipe flanges
GB/T 9124-2010 Specification for steel pipe flanges
GB/T 12220 Industrial valves—Marking
GB/T 12221 Metal calves—Face to face, end to end, center to face and center to end dimensions
GB/T 12228-2006 General purpose industrial valves—Specification of carbon steel forgings
GB/T 12229-2005 General purpose industrial valves—Specification of carbon steel castings
GB/T 12230-2005 General purpose industrial valve—Specification of stainless steel castings
GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 13927 Industrial valves—Pressure testing
GB/T 14976-2012 Seamless stainless steel pipes for fluid transport
GB/T 16253-1996 Steel castings for pressure purposes
GB/T 17395-2008 Dimensions, shapes, masses and tolerances of seamless steel tubes
GB24511-2009 Stainless steel plate, sheet and strip for pressure equipment
GB/T 26480 Valve inspection and testing
JB 4741-2000 Nickel-copper alloy hot rolled plate for pressure vessels
JB 4743-2000 Nickel-copper alloy forgings for pressure vessels
JB/T 5263-2015 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 6902 Methods for liquid penetrant examination of valves
JB/T 6903 Methods for ultrasonic examination of steel forging for valves
JB/T 7248-2008 Technical specification for low temperature service steel casting for valves
JB/T 7927 Valve cast steel visual quality requirements
NB/T 47008-2010 Carbon and alloy steel forgings for pressure equipment
NB/T 47009-2010 Low alloy steel forgings for low temperature pressure equipment
NB/T 47010-2010 Stainless and heat-resisting steel forgings for pressure equipments
NB/T 47014 Welding procedure qualification for pressure equipment
TSG Z6002 Examination rules for welding operators of special equipment
ASME B16.25-2003 Butt welding ends
ASME B16.34-2013 Valves—Flanged, threaded, and welding end
ASME BPVC II Boiler and pressure vessel code—Section II: Materials
ASTM A 105-2005 Carbon steel forgings for piping applications
ASTM A 182-2007 Forged or rolled alloy-steel pipe flanges, forged fittings, and valves and parts for high-temperature service
ASTM A 216-2007 Steel castings, carbon, suitable for fusion welding, for high-temperature service
ASTM A 217-2007 Steel castings, martensitic stainless and alloy, for pressure containing parts, suitable for high-temperature service
ASTM A240-2007 Chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications
ASTM A307-2004 Carbon steel bolts and studs, 60,000 psi tensile strength
ASTM A312-2008 Seamless, welded, and heavily cold worked austenitic stainless steel pipes
ASTM A335-2006 Seamless ferritic alloy-steel pipe for high-temperature service
ASTM A350-2004a Carbon and low-alloy steel forgings, requiring notch toughness testing for piping components
ASTM A351-2006 Castings, austenitic, austenitic-ferritic (duplex), for pressure containing parts
ASTM A352-2006 Steel castings, ferritic and martensitic, for pressure-containing parts, suitable for low-temperature service
ASTM A358-2008 Electric-fusion-welded austenitic chromium-nickel stainless steel pipe for high-temperature service and general applications
ASTM A369-2006 Carbon and ferritic alloy steel forged and bored pipe for high-temperature service
ASTM A376-2006 Seamless austenitic steel pipe for high-temperature central-station service
ASTM A387-2006a Pressure vessel plates, alloy steel, chromium-molybdenum
ASTM A430-1991 Austenitic steel forged or bored pipe-replaced by A312-2001a
ASTM A494-2009 Castings, nickel and nickel alloy
ASTM A515-2003 Pressure vessel plates, carbon steel, for intermediate- and higher-temperature service
ASTM A516-2006 Pressure vessel plates, carbon steel, for moderate- and lower-temperature service
ASTM A672-2008 Electric-fusion-welded steel pipe for high pressure service at moderate temperatures
ASTM A691-1998
(R2007) Carbon and alloy steel pipe, electric-fusion welded for high-pressure service at high temperatures
ASTM A789-2008b Seamless and welded ferritic/austenitic stainless steel tubing for general service
ASTM A790-2004 Seamless and welded ferritic/austenitic stainless steel pipe
ASTMB163-2008 Seamless nickel and nickel alloy condenser and heat-exchanger tubes
3 Pressure-temperature rating
3.1 General
3.1.1 Pressure-temperature rating
For Class series valves, the pressure-temperature rating of standard pressure class shall be as specified in Table 2-1A to Table 2-28A, and the pressure-temperature rating of special pressure class shall be as specified in Table 2-1B to Table 2-28B.
For PN series valves, the pressure-temperature rating of standard pressure class shall be as specified in Table 2-29A to Table2-71A, and the pressure-temperature rating of special pressure class shall be as specified in Table 2-29B to Table 2-71B. If the pressure-temperature rating of standard pressure class is not specified in Table 2-29A to Table 2-71A, it may be as specified in GB/T 9124-2010.
The pressure-temperature rating of the valve of limited pressure class shall not exceed the value calculated according to Annex A.
3.1.2 Valve of standard pressure class
Valves that meet the requirements of this standard, and valves other than those meeting the requirements for special pressure class valves given in Clause 8 and the requirements for limited pressure class valves given in Annex A, are defined as standard pressure class, and their pressure-temperature ratings are as specified in 3.1.1.
3.1.3 Valves of special pressure class
Valves that meet the requirements of 3.1.2 and the inspection requirements specified in Clause 8 are defined as special pressure class, and their pressure-temperature ratings are as specified in 3.1.1. Special pressure class ratings do not apply to flanged end valves.
3.1.4 Valves of limited pressure class
Welded or threaded valves that meet the requirements for limited pressure class given in Annex A and have the pressure-temperature rating not exceeding the value calculated according to Annex A and the nominal diameter not greater than DN65 are defined as limited pressure class. The requirements for standard pressure class valves are applicable to limited pressure class valves unless otherwise specified in Annex A. The pressure-temperature rating of limited pressure class does not apply to flanged valves.
3.1.5 Valves of intermediate rating
Class series welded or threaded valves, and Class 400 flanged valves of standard pressure class may have the intermediate rating between the listed rated temperatures or rated pressures determined with linear interpolation method according to 6.1.5. However, linear interpolation method is not allowed to determine the nominal pressure class for flanged valves of other pressure class.
3.1.6 Weldment
Valves welded in whole or in part with castings, forgings, bars, plates or pipes shall meet the following requirements:
a) GB150.1 and GB150.3-2011 for assembly welding;
b) GB150.4 for heat treatment of welding;
c) GB150.4 for weld inspection and acceptance;
d) The requirements mentioned above are not applicable to seal welding or attachment welding, such as the welding of back seal seats, valve seat rings, lifting lugs and auxiliary connectors.
3.2 Rated temperature
Rated temperature refers to the temperature corresponding to pressure rating, and is the highest temperature applicable to the pressure-containing housing of the valve, i.e. the highest allowable temperature of the working medium.
Foreword i
1 Scope
2 Normative references
3 Pressure-temperature rating
3.1 General
3.2 Rated temperature
3.3 Temperature effects
3.4 Instructions for use of flanged valve rating
3.5 Deviations
3.6 Material classes
3.7 Local operating conditions
4 Marking
5 Materials
5.1 General
5.2 Material selection
5.3 Antistatic requirement
5.4 Removal of end flange
6 Design requirements
6.1 Valve body design
6.2 End dimensions
6.3 Auxiliary connections
6.4 Valve assembly
6.5 Stem
6.6 Installation limitations
6.7 Wafer-type valves
7 Pressure test
7.1 Housing test
7.2 Leakage test
7.3 Surface protection
8 Requirements for special pressure class valves
8.1 Scope
8.2 General
8.3 Testing required
8.4 Defect removal and repair
Annex A (Normative) Requirements for valves of limited pressure class
Annex B (Normative) Basic equations for the minimum wall thickness
Annex C (Informative) Relationship between nominal diameter of valve and basic inner diameter of valve body at the end
Annex D (Informative) Determination method of pressure-temperature rating
Bibliography
