GB/T 12224-2015 PDF English
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General requirements for industrial steel valves
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| GB/T 12224-2005 | English | RFQ |
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General requirements for industrial steel valves
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| GB/T 12224-1989 | English | 439 |
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General requirements for industrial steel valves
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GB/T 12224-2015: General requirements for industrial steel valves---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12224-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.01
J 16
Replacing GB/T 12224-2005
General requirements for industrial steel valves
Issued on. DECEMBER 10, 2015
Implemented on. JULY 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 5
1 Scope... 7
2 Normative references... 7
3 Pressure-temperature rated values... 11
4 Markings... 15
5 Materials... 15
6 Design requirements... 17
7 Pressure test... 34
8 Requirements for special pressure level valves... 37
Annex A (normative) Requirements for defined pressure level valves... 181
Annex B (normative) Basic formulas for minimum wall thickness... 185
Annex C (informative) Relationship between the nominal size of valves and the
basic inner diameter of valve body end... 186
Annex D (informative) Method for determining pressure-temperature rated
values... 189
Bibliography... 200
1 Scope
This Standard specifies the pressure-temperature rated values, materials,
design requirements, inspection and test, markings of steel valves, and
requirements for special pressure level valves and defined pressure level
valves.
This Standard applies to flanged, threaded and welded valves, as well as clip-
on valves and valves for single flange installation, of which the pressure-
bearing members are made using the materials given in Table 1A and Table 1B;
the valve body is made by casting, forged rolling, rolling and assembling-
welding. This Standard includes valves of which the nominal pressure is Class
series and PN series. The range of steel valve parameters to which this
Standard applicable is.
a) The pressure level of Class series valves is Class150 ~ Class4500, of
which Class4500 only applies to welded valves; the pressure level of PN
series valves is PN2.5 ~ PN400;
b) The nominal size of flanged valves is not greater than DN1250;
c) The nominal size of socket welded valves and threaded valves is not
greater than DN65;
d) The rated temperature of threaded valves is not greater than 538 °C, the
pressure level is not greater than Class2500;
e) Flanged valves only apply to standard pressure level and does not apply
to special pressure level and defined pressure level valves;
f) Flanged valves have no intermediate pressure rated values.
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 150.1 Pressure vessels - Part 1.General requirements
GB 150.2 Pressure vessels - Part 2.Materials
GB 150.3-2011 Pressure vessels - Part 3.Design
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
GB 713-2014 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
3 Pressure-temperature rated values
3.1 General
3.1.1 Pressure-temperature rated values
For Class series valves, the pressure-temperature rated values of standard
pressure level shall comply with the requirements of Table 2-1A ~ Table 2-28A,
and the pressure-temperature rated values of special pressure level shall
comply with the requirements of Table 2-1B ~ Table 2-28B.
3.1.2 Standard pressure level valves
Valves that meet the requirements of this Standard, except those that meet the
requirements of Clause 8 for special pressure level valves and requirements of
Annex A for defined pressure level valves, are designated as standard pressure
level valves, of which the pressure-temperature rated values comply with the
requirements of 3.1.1.
3.1.3 Special pressure level valves
Valves that meet the requirements of 3.1.2 and meet the inspection
requirements specified in Clause 8 are designated as special pressure level
valves, of which the pressure-temperature rated values comply with the
requirements of 3.1.1.Special pressure level rated values are not available for
flanged end valves.
3.1.4 Defined pressure level valves
Welded or threaded valves that meet the requirements of Annex A for defined
pressure level valves, with the pressure-temperature rated values does not
exceed the value calculated according to Annex A and the nominal size of not
more than DN65 are designated as defined pressure level valves.
4 Markings
The valve marking is in accordance with the requirements of GB/T 12220.
Except for the marking contents specified in GB/T 12220, if the pressure-
temperature rated values of standard pressure level valves are limited by the
material of the internal parts, or if there are other changes, the manufacturer's
nameplate shall include these restrictions or change markings. For example,
valves with non-metallic seals or valves with medium flange bolts using carbon
steel.
5 Materials
5.1 General
5.1.1 The material selection of pressure-bearing members such as valve body,
bonnet or cover plate is as specified in Table 1A or Table 1B.
5.1.2 The pressure-bearing members such as valve body, bonnet or cover plate
may be made of different materials or different types of materials. The material
of the valve body shall be determined according to the applicable pressure-
temperature rated values. The material of the bonnet or cover plate shall be
adapted to the pressure-temperature rated values of the valve body.
5.1.3 For valves of which the valve body, bonnet or cover plate is carbon steel,
the nominal pressure is not greater than PN40 and Class300, under the use
condition that the temperature is not greater than 200 °C, the medium flange
connection bolt is allowed to adopt the carbon steel of which the yield strength
is not lower than Class B in ASTM A307-2004, such as 25- and 35-steel in GB/T
699, and marked on the nameplate as specified in Clause 4.
5.2 Material selection
5.2.1 Working conditions
In use, the material has the possibility of qualitative change, the transformation
of carbide phase into graphite, the oxidation of ferrite materials, the lowering of
the toughness of carbon steel even at temperatures above -10 °C, the
sensitivity of intergranular corrosion of austenitic materials, the grain boundary
erosion of nickel-based alloys, etc., which are all factors that need to be
considered.
5.2.2 Other requirements
When the working conditions have special requirements on the materials, the
user shall make special requirements for the manufacturer in order to ensure
that the materials meet the technical conditions of the specific working
conditions.
5.3 Anti-static requirements
Internal parts that are insulated from the valve body may accumulate static
charges, such as valve seats and seal members made of non-conductive
materials in ball valves. Grounding conditions shall be provided when the
working conditions require protection against static electricity.
6 Design requirements
6.1 Valve body design
6.1.1 Nominal size and nominal pressure
The nominal size of PN series valves is in accordance with GB/T 1047, and the
nominal pressures are PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100,
PN160, PN250, PN320, PN400, and shall comply with the requirements of
GB/T 1048.
6.1.2 Wall thickness
The wall thickness tm of the valve body shall not be less than those specified in
Table 3A or Table 3B or the minimum value tm calculated according to Annex B,
except as indicated in 6.1.4 ~ 6.1.8, 6.2 and 6.7.When using the values listed
or calculated in Table 3A or Table 3B, the minimum wall thickness value among
the values may be obtained by linear interpolation method.
6.2 End dimensions
6.2.1 Butt welded end
If the user does not have special requirements, the outer surface of the welded
end shall all be machined, and the outer contour of the outer weld layer may be
selected by the manufacturer. The shape, dimensions, tolerances and
requirements of the but welded end of PN series valves are in accordance with
GB/T 9124-2010.The shape, dimensions, tolerances, and requirements of the
but welded end of Class series valves are in accordance with ASME B16.25-
2003.
6.4 Valve assembly
The valve body and the bonnet or cover plate are bolted or threaded to the
valve and shall comply with the following requirements for tensile area and
shear area. The connecting thread shall meet the requirements of GB/T 196,
and the tolerance and fit of the thread shall meet the requirements of GB/T 197.
6.5 Stem
6.5.1 Stem positioning
The valve is designed so that the stem cannot be fixed only by the stem seal
fasteners (such as packing sleeves). When the valve is under pressure,
disengage the stem seal fastener and the stem must not fly out of the valve
cavity.
6.5.2 Position marking
Partial rotary valves (i.e., valves that rotate a quarter turn, such as ball valves,
plug valves, butterfly valves) shall have components that indicate the open and
closed position of the valve, and it requires that the structure does not
erroneously indicate the open and closed position of the valve.
6.6 Installation restrictions
6.6.1 Single flange installation
Flanged, clip-on valves are typically installed between pairs of flanges. These
valves can also be installed with a single flange to seal the pipe ends. All seat
sealing components of single flange installed valves shall be able to withstand
the maximum rated differential pressure of the valve. If the valve structure
cannot withstand such pressure load, the valve shall be marked in accordance
with GB/T 12220 to indicate that this installation method is restricted.
7 Pressure test
7.1 Housing test
7.1.1 Housing test pressure
Each valve shall be subjected to the housing test with a test pressure not less
than 1.5 times the 38 °C pressure rated value, which is rounded to 0.1 MPa.
The test medium may be water (may contain preservatives), kerosene or other
suitable liquid with a viscosity not greater than water. The test medium shall be
carried out at a temperature between 5 °C and 50 °C. The valve shall be
partially open during the test.
7.1.2 Housing test duration
The duration of the test in which the valve is fully prepared and at the housing
test pressure is not less than that specified in Table 11.
7.1.3 Determination of housing test results
It is determined unqualified when there is visible leakage through the pressure-
receiving wall. The pressure-receiving wall includes all the pressure-receiving
members such as valve body, bonnet or cover plate, and middle flange gasket.
Leakage through the stem seal shall not be a cause of qualification. However,
the stem seal shall be able to maintain at least 38 °C pressure rated value
without significant visible leakage.
7.2 Seal test
7.2.1 Seal test pressure
After the housing test, each shut-off valve and check valve shall be subjected
to the seal test. The test medium shall be as specified in 7.1.1.The test
pressure shall be 1.1 times the 38 °C pressure rated value. When the gas is
used for the seal test, the seal test shall be carried out right after the housing
test.
7.2.2 Seal test duration
The minimum duration of the seal test is as specified in Table 13.The test
duration is the inspection duration in the test pressure state after the valve test
pressure has fully reached the required value.
7.2.3 Acceptance of seal test
The valve shall not be painted or coated with anti-leakage material prior to
completion of the pressure test, but internal linings or coatings included in the
design, such as the non-metallic lining of the butterfly valve body, are permitted.
Chemical anticorrosive treatment is allowed.
7.2.4 Double seat seal
For valves with double seat seals, such as most gate valves and ball valves,
the test pressure shall be applied to each side of the closure member in turn.
For a separate dual seat seal valve (such as a double disc gate valve), the test
pressure may be applied to the cavity of the valve body when the shutter is
closed.
7.3 Surface protection
The valve shall not be painted or coated with anti-leakage material prior to
completion of the housing test, except in the following cases.
8 Requirements for special pressure level valves
8.1 Scope
This clause specifies the non-destructive testing requirements and defect
exclusion and repair rules for casted, forged, rolled and assembled-and-welded
valve bodies, bonnets or cover plates of special pressure grade valves.
8.2 General
After heat treatment according to the requirements for the technical conditions
of materials, the casting, forging, rolling member, rolling or welding materials
are tested, and it is determined by the manufacturer whether to carry out before
or after machining. The surface of the test piece shall be clean and must not
conceal unacceptable surface defects. The inspection surface (see 8.3.1.2 and
8.3.2.2) does not include threads, drilled holes or threaded holes, such as
surfaces for bolted connections, sealing members, stems or auxiliary
connection holes.
8.3 Required testing
8.3.1 Castings
8.3.2 Forgings, bars, plates and tubes
8.3.2.1 Ultrasonic or radiographic testing
8.4 Defect removal and repair
8.4.1 Defect removal
Defects that exceed the acceptance criteria shall be removed in an appropriate
manner. After the surface defects have been removed to the permissible extent,
the wall thickness is not reduced below the allowable value and is to be gently
joined to the surrounding surface.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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