GB/T 150.3-2024 (GB/T150.3-2024, GBT 150.3-2024, GBT150.3-2024) & related versions
GB/T 150.3-2024: PDF in English (GBT 150.3-2024)
ICS 23.020.30
J 74
National Standard of the People’s Republic of China
GB 150.3－2011
Partially Replace GB 150－1998
Pressure Vessels—
Part 3. Design
ISSUE ON. NOVEMBER 21, 2011
IMPLEMENTED ON. MARCH 1, 2012
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.
GB
Table of Contents
1 Scope...1
2 Normative References...1
3 Cylinders and Spherical Shells Under Internal Pressure...2
4 Cylinder and Spherical Shell Under External Pressure...4
5 Heads ...27
6 Openings and Reinforcements ...70
7 Flange...102
Appendix A (Normative) Noncircular Cross Section Vessels ...150
Appendix B (Normative) Flat Steel Ribbon Wound Cylinder...187
Appendix C (Informative) Seal Structure ...191
Appendix D (Informative) Structure of Welding Joint ...240
Appendix E (Normative) Basic Design Requirements for Low Temperature Pressure Vessels ...266
7 Flange
7.1 General Provision
7.1.1 This Chapter is applicable to the design of bolted flange connection for hydrostatic pressure
and gasket compacting pressure. When the Standards JB 4700~4707 are applied, the calculation stated
in this Chapter may be exempted.
7.1.2 The design of bolted flange connection includes.
a) The determination of the materials, types and dimensions of the gaskets;
b) The determination of the materials, specifications and quantity of the bolts;
c) The determination of the materials, sealing surface types and structural dimensions of the
flanges;
d) The stress checking shall be carried out, and the corrosion allowance is not included in all
dimensions for calculating;
e) As for narrow face integral flange under internal pressure and for narrow face optional type
flange calculated in accordance with integral flange, they shall undergo rigidity checking.
7.1.3 The material selection of bolts and flanges shall meet the requirements of GB 150.2.
7.1.4 The hubbed flange shall be fabricated by hot rolling or forging processing. The post-processed
flange axes must be parallel with the original billet axes. Where the hubbed flange is fabricated by
adopting steel plate, the following requirements shall be met.
a) The ultrasonic testing shall be carried out for steel plate which shall be free from such defect
as layering;
b) The batten shall be cut out along the rolling direction for steel plate fabrication, then applied
with bending and butt welding to become a circular ring, making the steel plate surface into the side
surface of the ring;
c) Fully penetrated butt joint shall be adopted for the circular ring;
d) The butt joint of the circular ring shall be applied with post-weld heat treatment and 100%
ray testing or ultrasonic testing, and the approval standard shall be specified according to the requirements
of JB 4700.
7.1.5 Normalizing or full annealing heat treatment shall be carried out for flange fabricated with
carbon steels or low alloy steels under any of the following conditions.
a) Flange with a sectional thickness greater than 50mm;
b) Forged flange.
7.1.6 Post-weld heat treatment shall be carried out for the butt weld of flange ring fabricated with
carbon steel or low alloy steel plates or sectional materials and for the welded integral flange [see
Figure 7-1g)].
7.1.7 The nominal diameter of bolt shall not be less than M12. Where the nominal diameter is
greater than M48, fine thread shall be adopted.
7.2 Classification of Flanges
7.2.1 Narrow contact face flange. the contact surface of gasket shall be located within the circumference
enclosed by the flange bolt hole; its common structure types are detailed in Figure 7-1 and Figure 7-2,
and the calculation method shall be in accordance with those specified in 7.5.
As for special structure type of narrow face flanges, such as counter flange, the calculation
method is in accordance with 7.6 and the structural calculation for cylindrical end is in accordance
with 7.7.
7.2.2 Wide contact face flange. the contact surface of gasket is distributed at the internal and
external sides of the center circle of flange bolt, and the calculation method shall be in accordance
with those specified in 7.8.
7.3 Terms, Definitions and Symbols
7.3.1 The terms and definitions defined in “general requirements” GB 150.1 is applicable to this
Chapter.
7.3.2 Symbols
Aa——The minimum total cross section area of bolt required under pre-tightening state, mm2;
Ab——The actually used total cross section area of bolt, mm2;
Am——The total cross section area required for bolt, mm2;
Ap——The total cross section area of bolt required under operating state, mm2;
b——The effective sealing width of gasket, mm;
bo——The basic sealing width of gasket, mm;
Db——The diameter of center circle in bolts, mm;
DG——The diameter of the center circle applied with the compacting pressure on gasket (see
Figure 7-1), mm;
Di1——The calculated diameter of flange, mm;
Do——The external diameter of flange (for flange with slotted bolt hole of swing bolt, it refers
to the diameter of the circle at the slotted hole bottom. And for cylindrical end, it refers
to the external diameter of the cylindrical end), mm;
D2——The external diameter of the sealing surface of cylindrical end, mm;
d1——The parameter, see Formula 7-16 or Table 7-5, mm3;
dB——The nominal diameter of bolt, mm;
db——The diameter of bolt hole, mm;
E——The elasticity modulus of flange materials, (according to GB150.2), MPa;
e——The parameter, see Formula (7-16) or Table 7-5, mm－1;
F——The total axial force caused by internal pressure, N;
Appendix A
(Normative)
Noncircular Cross Section Vessels
A.1 General Provisions
A.1.1 This Appendix is applicable to design, fabrication and acceptance of the noncircular cross
section single-layer welded vessels. In addition to the provisions stated in this Appendix, the vessels
designed and fabricated according to this part still shall meet the relevant provisions given in other
parts of this standard.
A.1.2 The design method given in this Appendix is applicable to the vessels having a rectangular,
obround and elliptical cross section, as shown in Figure A.1~Figure A.8, and Figure A.10~Figure A.13.
As for the noncircular vessels having other shapes of cross section, the membrane stress and bending
stress may be calculated according to other analysis methods, and then the checking shall be carried
out according to the strength conditions stated in this Appendix.
A.1.3 Considerations of the calculation formula in this Appendix are merely based upon both the
membrane stress and bending stress caused by the internal pressure loads. All the local stress and
thermal stresses caused by other mechanical loads (e.g. reaction forces produced by supports, connection
pipes and other members) shall be calculated according to other suitable methods, and the strength
conditions may be determined according to A.3.
A.1.4 The calculation formula in this Appendix are applicable to those vessels of aspect ratio (the
ratio of the vessel length to the inner long side length of cross section or to the major axis) larger than
4. As for the vessels with aspect ratio less than 4, the formula in this Appendix still may be used for
calculation; however, the results shall be more conservative. If the reinforcing effects of end closures
are considered, the more accurate methods may also be used for the calculation.
A.1.5 When conducting design calculation of vessel according to this Appendix, the structural
dimensions of the vessel (like thickness, reinforcement dimensions, etc.) shall be determined in
advance, and then the stress calculation and checking shall be carried out as required until meeting all
the requirements.
A.2 Symbols
A——The parameter, see Table A.1, mm;
A1——The cross-sectional area of reinforcement attached to the short-side lateral plate, mm2;
A2——The cross-sectional area of reinforcement attached to the long-side lateral plate, mm2;
A3——The parameter, see Table A.1, mm;
a——The major axis radius of the middle plane of elliptical cross section (see Figure A.5),
mm;
B——The parameter, see Table A.1, mm2;
b——The radius of the minor axis of the middle plane of elliptical cross section (see Figure
A.5), mm;
c——The distance ci from the neutral axis of plate cross section or of the combined section of
plate and reinforcement to the internal surface of calculated section or the distance co to
the external surface of calculated section. In the calculation of the bending stress of
internal and external surfaces, the ci or co value shall be substituted respectively, mm;
C1——The parameter, see Table A.1, mm2;
C2——The parameter, see Table A.1, ...
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| Standard ID | GB/T 150.3-2024 (GB/T150.3-2024) | | Description (Translated English) | Pressure vessels - Part 3: Design | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J74 | | Classification of International Standard | 23.020.30 | | Date of Issue | 2024-07-24 | | Date of Implementation | 2025-02-01 | | Older Standard (superseded by this standard) | GB/T 150.3-2011 |
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