Standard No.:	NB/T 11025-2022
English Name:	Stiffening ring
Chinese Name:	补强圈
Professional Classification:	NB    Professional Standard - Energy
Issued by:	National Energy Adminstration
Issued on:	2022-11-04
Implemented on:	2023-5-4
Status:	valid
Superseding:	JB/T 4736-2002 Reinforcing pad Formed heads for stee pressurc vessels
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

Announcement of the National Energy Administration of the People’s Republic of China [2022] No. 5 In accordance with the provisions of the Standardization Law of the People's Republic of China, and Measures for the administration of energy standardization, the National Energy Administration has approved and hereby issues 237 energy industry standards such as the Code for maintenance of wind farms (see Attachment 1), and 15 energy industry standards (English versions) such as Code for design of pumped storage power stations (see Attachment 2). Attachment: Catalogue of professional standards November 4, 2022 Attachment: Catalogue of professional standards S.N. Standard No. Standard name Standard replaced No. of the standard adopted Publishing agency Approval date Implementation date 1~40 (Omitted) 41 NB/T 11025-2022 Reinforcing pad JB/T 4736-2002 Beijing Science and Technology Publishing 2022-11-04 2023-05-04 42 NB/T 11026-2022 Plate and shell heat exchangers Beijing Science and Technology Publishing 2022-11-04 2023-05-04 43~84 (Omitted) 85 NB/T 47003.1-2022 Atmospheric pressure vessels - Part 1: Steel welded atmospheric pressure vessels NB/T 47003.1-2009 Beijing Science and Technology Publishing 2022-11-04 2023-05-04 86 NB/T 47003.2-2022 Atmospheric pressure vessels - Part 2: Silos for solid materials NB/T 47003.2-2009 Beijing Science and Technology Publishing 2022-11-04 2023-05-04 87 NB/T 47011-2022 Zirconium pressure vessels NB/T 47011-2010 Beijing Science and Technology Publishing 2022-11-04 2023-05-04 88 NB/T 47018.4-2022 Specification of welding materials for pressure equipment - Section 4: Electrodes and fluxes for submerged arc welding NB/T 47018.4-2017 Beijing Science and Technology Publishing 2022-11-04 2022-12-31 89 NB/T 47018.6-2022 Specification of welding materials for pressure equipment - Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods NB/T 47018.6-2011 Beijing Science and Technology Publishing 2022-11-04 2022-12-31 90 NB/T 47018.7-2022 Specification of welding materials for pressure equipment - Section 7: Titanium and titanium-alloy welding electrodes and rods NB/T 47018.7-2011 Beijing Science and Technology Publishing 2022-11-04 2022-12-31 91 NB/T 47018.8-2022 Specification of welding materials for pressure equipment - Section 8: Zirconium and zirconium-alloy welding electrodes and rods Beijing Science and Technology Publishing 2022-11-04 2022-12-31 92~237 (Omitted) Foreword Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents. This document replaces JB/T 4736-2002 Reinforcing pad, and the following main technical changes have been made with respect to JB/T 4736-2002: a) The application scope of reinforcing pads has been modified; b) The materials for the reinforcing pad have been added and requirements have been made for the materials added; c) The requirements for the fabrication and inspection of reinforcing pads made of non-ferrous metal materials have been added; d) Annex C "Density of materials commonly used for reinforcing pads" has been added. This document was proposed by and is under the jurisdiction of SAC/TC 262 National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China. The previous editions of this document are as follows: ——JB/T 4736-1995; ——JB/T 4736-2002; ——This is the second revision. Reinforcing pad 1 Scope 1.1 This document specifies the requirements for materials, types, and dimensions, as well as fabrication and inspection of reinforcing pads for the reinforcement of openings in the shells of pressure vessels. 1.2 The reinforcing pads specified in this document are used for structures where the openings in the shell of the pressure vessel are reinforced with reinforcing pads, and the structure with reinforcing pads for reinforcement shall be selected in accordance with those specified in GB/T 150.3. 1.3 This document is not recommended for vessels made of chromium-molybdenum steel, nor is it recommended for vessels that are designed to store substances with extreme or high toxicity hazards. 1.4 This document is not applicable to vessels that are subjected to fatigue loads. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions 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/T 150.2 Pressure Vessels - Part 2: Materials GB/T 150.3 Pressure vessels - Part 3: Design GB/T 150.4 Pressure vessels - Part 4: Fabrication, inspection and testing, and acceptance GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 197-2018 General purpose metric screw threads - Tolerances GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications JB/T 4734 Aluminium welded vessels JB/T 4745 Titanium welded vessels JB/T 4755 Copper pressure vessels JB/T 4756 Nickel and nickel alloy pressure vessels NB/T 47011 Zirconium pressure vessels NB/T 47013.3 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing NB/T 47013.4 Nondestructive testing of pressure equipment - Part 4: Magnetic particle testing NB/T 47013.5 Nondestructive testing of pressure equipment - Part 5: Penetrant testing NB/T 47014 Welding procedure qualification for pressure equipment 3 Symbols D1——the inside diameter of reinforcing pad, mm D2——the outside diameter of reinforcing pad, mm; dN——the nominal diameter of the nozzle, mm; do——the outside diameter of the nozzle, mm; δc——the thickness of reinforcing pad, mm; δn——the nominal thickness at the opening of the shell, mm; δnt——the nominal thickness of the nozzle, mm. 4 Types and dimensions 4.1 Bevel type 4.1.1 According to the requirements for the welded joint structure of the reinforcing pad, the bevel of the reinforcing pad can be divided into Types A, B, C, D, and E (see Figure 1). In addition to the types shown in Figure 1, the designers may customize the bevel type of the reinforcing pad according to the structural requirements. Figure 1 Bevel types for reinforcing pads 4.1.2 The applicable conditions for different types of bevels are as follows: a) Type A is applicable to fillet welded structures where the shell is internally beveled; b) Type B is applicable to partial-penetration structures where the shell is internally beveled; c) Type C is applicable to full-penetration structures where the shell is externally beveled; d) Type D is applicable to full-penetration structures where the shell is internally beveled; e) Type E is applicable to full-penetration structures where the shell is internally beveled. 4.2 Dimensions For steel reinforcing pads, it's advised to determine both their dimension series and weights as per Annex A, Table A.1. For reinforcing pads made of non-ferrous metals, their dimension series shall be determined with reference to Table A.1, with their weights converted based on the densities of the materials selected.

Foreword iii 1 Scope 2 Normative references 3 Symbols 4 Types and dimensions 5 Technical requirements 6 Designation Annex A (Informative) Dimension series and weight of steel reinforcing pads Annex B (Informative) Types and application scope of welded joints for reinforcing pads Annex C (Informative) Density of materials commonly used for reinforcing pads