NB/T 47015-2023 (NB/T47015-2023, NBT 47015-2023, NBT47015-2023) & related versions
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Welding specification for pressure vessels
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NB/T 47015-2023: PDF in English (NBT 47015-2023)
NB/T 47015-2011
ICS 25.160.10
J 33
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
NB/T 47015-2011 (JB/T 4709)
Replacing JB/T 4709-2000
Welding specification for pressure vessels
ISSUED ON. JULY 1, 2011
IMPLEMENTED ON. OCTOBER 1, 2011
Issued by. National Energy Administration
NB
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 General welding specification ... 5
4 Welding specifications for steel pressure vessels ... 12
5 Welding procedure of aluminum pressure vessels ... 31
6 Welding procedure of titanium pressure vessels ... 34
7 Welding procedure specifications of copper pressure vessels ... 37
8 Welding procedure specifications of nickel pressure vessels ... 41
9 Welding specification of composite metal pressure vessels ... 45
Annex A (Informative) Methods and scope of specification of weld joint position
... 51
Annex B (Informative) Shape and dimension of groove in welding of special
materials ... 55
Annex C (Informative) Recommendation form of welding procedure
specification ... 64
Announcement (Amendment) ... 70
Foreword
Compared with JB 4709-2000 Welding Specification for Pressure Vessels, the main
changes of this Standard are as follows.
- ADD the welding method; welding specification of Titanium, Aluminum, Copper and
Nickel products; Annex A “Method and scope of welding position” and Annex B
“Welding groove type and dimension of special materials”;
- CHANGE the “Welding specification of stainless composition steel” in Annex A of JB/T
4709-2000 AS “Welding specification for pressure vessels with composition metal”
from annex to standard text;
- To adapt to the newly added contents, the structural of this Standard is adjusted.
General welding specification of different materials as shown in Clause 3, welding
specification of different materials as shown in Clause 4 and Clause 9;
- REVISE the selection principle of welding materials, preheating temperature of steels;
after-heating temperature and PWHT (postweld heat treatment) in Clause 4;
- ADD the measurement position provisions of preheating temperature in Clause 3.
The Annex A, B and C of this Standard are informative annex.
This Standard was proposed and is under the jurisdiction of National Technical Committee
262 on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC
262).
Responsible drafting organizations and drafters of this Standard.
Hefei General Machinery Research Institute. Ge Zhaowen, Dou Wanbo, Fang Wunong
China Special Equipment Inspection and Research Institute. Shou Binan, Xie Tiejun, Yang
Guoyi
Participating drafting organizations and drafters of this Standard.
Special Equipment Safety Supervision Bureau of General Administration of Quality
Supervision, Inspection and Quarantine of the People's Republic of China. Li Jun
Shanghai Boiler Works Co., Ltd.. Yang Peiliang
Harbin Boiler Co., Ltd.. Yang Song
Lanzhou Lanshi Machine Equipment Co., Ltd.. Lei Wanqing
Fushun Mechanical Equipment Manufacturing Co., Ltd.. Hu Xihai
Welding specification for pressure vessels
1 Scope
This Standard specifies the basic requirements for the welding of pressure vessels
made of steel, aluminum, titanium, copper, nickel and composition metal.
This Standard is applicable to the pressure vessels used for gas welding, arc welding
by electrodes, hidden arc welding, MIG Welding, gas tungsten-arc welding, electroslag
welding, plasma arc welding, friction welding, electrogas welding and screwbolt arc
welding, etc.
This Standard is not applicable to gas cylinder.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) are
applicable to this standard.
GB/T 985.3 Recommended joint preparation for gas-shield arc welding on
aluminium and its alloys
GB/T 3670 Coated electrodes for copper and copper alloys
GB/T 9460 Copper and copper alloy wires and rods
NB/T 47002 (all parts) Explosion welded clad plate for pressure vessels
NB/T 47014 Welding procedure qualification for steel pressure vessels
NB/T 47018 (all parts) Technical permission of welding materials for pressure
equipment
JB/T 4745 Titanium welded vessels
TSG Z6002-2010 Examination rules for welding operators of special equipment
3 General welding specification
3.1 General specification
3.1.1 Besides the specifications in this Standard, the welding of pressure vessels shall
also meet the technical requirements of the design document.
3.1.2 Besides the specifications in this Standard, all results that have been proofed to
be valid through test research and practice, recognized by all parties and listed into
the enterprise standards can be applicable to the welding of pressure vessels.
3.2 Welding materials
3.2.1 The welding materials include the welding rod, welding wire, welding strip,
welding flux, gas, electrode, liner, etc.
3.2.2 Selection rules of welding materials.
a) The mechanical property of the weld metal shall be higher than or equal to the
specified limit value of the parent metal; if necessary, other properties shall be
not lower than relevant requirements of the parent metal; or the mechanical
property and other properties shall meet the technical requirements specified in
the design document;
b) The proper welding materials and reasonable welding procedure shall be
adopted to ensure that the properties of welding joints can still meet the
requirements specified in the design document and meet the service
requirements after the manufacturing procedure;
c) The manufacturing (installation) unit shall master the welding properties of
welding materials; the welding materials used for pressure vessel shall pass the
welding test or have practical basis.
3.2.3 The welding materials of pressure vessels shall conform to the specifications in
NB/T 47018.
3.2.4 The welding materials shall include the product quality certificate and conform to
the specifications of relevant standards. The using organization shall accept or retest
the welding materials according to specifications of quality management system and
relevant standards, can only use the welding materials after they are qualified.
3.3 The position of weld joint is divided into. plat weld joint, vertical weld joint, horizontal
weld joint and overhead weld joint. See Annex A for the specifying method and scope
of the position of weld joint.
3.4 Welding procedure qualification and welder
3.4.1 The welding procedure for all kinds of the following weld joints shall be
determined qualified according to NB/T 47014.
a) Weld joint of pressure part;
rate of the transition weld joint metal.
3.5.3 See Annex B for the form and dimension of the weld groove of special material.
3.5.4 Groove preparation
3.5.4.1 The groove can be manufactured through cold processing or hot processing
method. If the groove is manufactured according to hot processing method, the surface
layer that affects the welding quality shall be removed through cold processing method.
3.5.4.2 The weld groove surface shall be smooth and tidy without crack, slice, sundries
and other defects.
3.5.5 The welding equipment, heating equipment and auxiliary equipment shall be in
normal operating condition, shall be safe and reliable; the instruments shall be
corrected or inspected regularly.
3.5.6 Group positioning
3.5.6.1 In the Group positioning process, pay attention to the protection of stainless
steel and the surface of non-ferrous metal, avoid mechanical damage.
3.5.6.2 After the Group positioning, the groove interval, alignment tolerance and weld
joint angularity shall conform to the drawing specifications or construction
requirements.
3.5.6.3 Avoid assembly be force, the length and interval of the tack weld joint shall
conform to the requirements in the welding technical document.
3.5.6.4 If the restraint intensity of the weld joint is too large, it shall be welded with
welding material with better crack resistance.
3.5.6.5 There shall be no crack in the tack weld joint, otherwise, it shall be removed
and the weld joint shall be welded again.
3.5.6.6 The two ends of tack weld joint fusing into the permanent weld joint shall be
convenient for jointing of arc, otherwise it shall be modified;
3.5.7 Preheating
3.5.7.1 The preheating before the welding of pressure vessel and the preheating
temperature shall be determined according to the delivery state of parent metal,
chemical composition, mechanical property, welding property, thickness, restraint
degree of the weldment and other factors.
3.5.7.2 Besides relevant standards for the preheating temperature of the weld joint,
the preheating temperature shall be determined through general welding pro...
......
| Standard ID | NB/T 47015-2023 (NB/T47015-2023) | | Description (Translated English) | (Pressure vessel welding procedures) | | Sector / Industry | Energy Industry Standard (Recommended) | | Word Count Estimation | 54,586 | | Date of Issue | 2023-12-28 | | Date of Implementation | 2024-06-28 | | Administrative Organization | National Technical Committee for Standardization of Boiler and Pressure Vessels |
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