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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 is Part 5 of GB/T 16507 Water-tube boilers. The following parts of GB/T 16507 have been published:
——Part 1: General requirement;
——Part 2: Materials;
——Part 3: Structure design;
——Part 4: Strength calculation of pressure parts;
——Part 5: Fabrication;
——Part 6: Inspection, testing and acceptance;
——Part 7: Safety appurtenances and instruments;
——Part 8: Installation and operation.
This document replaces GB/T 16507.5-2013 Water-tube boilers - Part 5: Fabrication. In addition to structural adjustment and editorial changes, the following main technical changes have been made with respect to GB/T 16507.5-2013:
——The definitions of "cold forming" and "hot forming" are changed (see 3.1~3.2; 3.1~3.2 of Edition 2013);
——The definition of “nominal thickness of weld” is added (see 3.4);
——The qualification requirements of boiler fabrication units and personnel are deleted (see 4.1 of Edition 2013);
——The assembly requirements of water-tube boilers are added (see 4.6);
——The provision that “Boiler fabrication shall be under supervision and inspection” is added (see 4.7);
——The requirements for fabrication supervision and inspection of tubes and their assembled devices within the scope of utility boilers are added (see 4.8);
——The scope of marking materials with steel seals is changed, and the marking methods are detailed (see 5.1~5.4; 5.1~5.4 of Edition 2013);
——The preheating requirements for hot cutting of materials are added (see Table 1 of 6.2.2);
——The heat treatment requirements for austenitic steel drum after forming are deleted [see 6.3.3 a) of Edition 2013];
——The expression of equation for tensile deformation rate is changed [see Equation (1) and Equation (2); Equation (1) and Equation (2) of Edition 2013];
——The heat treatment requirements for tube after forming are changed (see 6.4.1.2 and 6.4.4; 6.4.4 of Edition 2013);
——The equations for thinning the outside of the bend and thickening the inside of the bend are changed, and the equations for the thickness reduction ratio of the bend are added [see Equation (3), Equation (4) and Equation (5); Equation (3) and Equation (4) of Edition 2013];
——The scope of thickening requirements for the inside of bend is changed [see 6.4.2.5 b); 6.4.2.4.1 b) of Edition 2013];
——Relevant provisions on heat treatment of 07Cr2MoW2VNbB material are deleted; the requirements for heat treatment after tube forming are changed and detailed; the requirements for heat treatment of Fe-5B-2 after cold bending are supplemented in the form of table notes; and the requirements for heat treatment of austenitic steel tubes after cold forming are added (see 6.4.4.1~6.4.4.4, Table 2 and Table 3; 6.4.4.1~6.4.4.2 and Table 1 of Edition 2013);
——The requirements for thickness deviation of seal head are improved [see 6.5.1.7 c); 6.5.1.7 c) of Edition 2013], and the schematic diagram for thickness deviation of seal head are added (see Figure 7);
——The fabrication and assembly tolerances of boiler drum and start-up (steam-water) separator are integrated, and the requirements for fabrication and assembly tolerances of water storage tank are added (see 6.5.1, Table 4 and Table 5; 6.5.1~6.5.2, Table 2, Table 3 and Table 4 of Edition 2013);
——The expressions given in Figure 8, Figure 11 and Figure 12 are corrected (see Figure 8, Figure 11 and Figure 12; Figure 7, Figure 10 and Figure 11 of Edition 2013);
——The fabrication and dimensional deviation control requirements of heated surface tube, tubing, header, start-up (steam-water) separator and water-cooled wall components are detailed (see 6.5.3 and 6.5.4; 6.5.4 and 6.5.5 of Edition 2013);
——The product specimen requirements during the production of membrane tube panel are added (see 6.5.4.1);
——Requirements for expansion record and hydrostatic test after expansion are added (see 7.7.4 and 7.7.5);
——Two specifications of nominal outside diameters of tube (i.e. 14~16 and 18~25) are deleted from the tube hole dimensional deviation (see Table 9 of Edition 2013);
——Other tests specified in the contract, such as joint hardness test and fracture test, are deleted from the test items of welding procedure qualification and product welded test pieces [see 8.2.3 c), 8.2.7 and 8.9.3 c) of Edition 2013];
——The assessment requirements for test results of full-weld metal tensile specimen are changed (see 8.2.7; 8.2.5 of Edition 2013);
——The acceptance criteria of Charpy V-notch impact test of weld deposited metal and heat affected zone is added (see 8.2.8);
——The requirements for preservation of welding procedure qualification specimens are added (see 8.2.10);
——The requirements for welding records of welding operators and steel seal (or record) of welder code are added (see 8.4.2);
——The minimum preheating temperature before welding and expression of materials Fe-1, Fe-3, Fe-5A, Fe-5B-2, Fe-5C are changed (see 8.7.2.5 and Table 13; 8.7.2 of Edition 2013);
——The quality requirements for mechanical damages on the surface of straight tubes are included in the clause of "repair" (see 8.9.3; 6.4.2.4.4 of Edition 2013);
——The requirement that “No repair welding shall be allowed for iron casting used at pressure bearing parts.” is added (see 8.9.3.2);
——The specific contents of product welded test pieces are deleted, and the relevant requirements shall be implemented according to GB/T 16507.6 (see 8.10; 8.9 of Edition 2013);
——The heat treatment requirements are added if the welded tube hole must be opened on the weld and its heat affected zone due to structure design (see 9.1.5);
——The requirements for heating section length during post weld sectional heat treatment of tubing components are deleted (see 9.3.2.2 of Edition 2013);
——The limiting conditions of the temperature of furnace installed on the tubes on heating surface are changed (see 9.3.3.1; 9.3.3.2 of Edition 2013);
——The temperature rise and drop speed of post weld heat treatment is changed (see 9.3.3.2 and 9.3.3.3; 9.3.3.3 and 9.3.3.4 of Edition 2013);
——The requirements for post weld heat treatment temperature for Fe-5C materials are changed (see Table 14 of 9.3.3.2; Table 12 of 9.3.5.3 of Edition 2013);
——The note of Fe-5B-2 materials is deleted and its contents are included in footnote a of Table 14 (see Table 14 of 9.3.3.2; note of Fe-5B-2 materials in Table 12 of Edition 2013);
——The conditions for canceling post weld heat treatment of Fe-1, Fe-4 and Fe-5A materials are changed (see 9.3.6; notes of Fe-1, Fe-4 and Fe-5A materials in Table 12 of Edition 2013);
——The expression of holding time when the post weld heat treatment temperature is lower than the specified minimum holding temperature is changed (see Table 15 of 9.3.6.1; Table 13 of 9.3.5.3 of Edition 2013);
——The heat treatments not required in this document are added; the condition “When welding is required after heat treatment, no heat treatment is required after welding” is not changed (see 9.4.2);
——Requirements for painting and packing are added (see Clause 10);
——The qualification standards for depth of fusion when steel tube and steel flat are welded with gas-shielded arc welding and manual metal arc welding are changed (see Table B.1, Table B.1 of Edition 2013);
——Grouping and classification of 07Cr2MoW2VNbB material are deleted, and materials may be applied by enterprises according to their own experience (see Table C.1 of Edition 2013).
Attention is drawn to the possibility that some of the parts of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
The previous editions of this document are as follows:
——This document was firstly issued as GB/T 16507-1996 in 1996;
——In its first revision in 2013, the contents of water-tube boilers and shell boilers are divided into eight parts respectively; the contents of water-tube boilers are specified in GB/T 16507.1-2013 ~ GB/T 16507.8-2013 under the general title Water-tube boilers; the contents of shell boilers are specified in GB/T 16508.1-2013 ~ GB/T 16508.8-2013 under the general title Shell boilers. This document is GB/T 16507.5-2013 Water-tube boilers - Part 5: Fabrication.
——This is the second revision.
Introduction
GB/T 16507 Water-tube boilers is one of the general boiler construction standards that shall be developed, revised and under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (hereinafter referred to as "the Committee"). It was developed according to the basic safety requirements of the boiler safety regulations promulgated by the nation, and all the design criteria, material requirements, technical requirements for fabrication and inspection, acceptance criteria and installation requirements meet the relevant requirements of TSG 11 Regulation on safety technology for boiler. GB/T 16507 is a coordinative standard, which meets the basic requirements of Regulation on safety technology for boiler and the requirements of TSG 91 Regulation on energy conservation and environmental protection technology for boiler. GB/T 16507, which consists of the following eight parts, is designed to standardize the design, fabrication, inspection, acceptance and installation of boilers.
——Part 1: General requirements, designed to determine the general technical requirements related to water-tube boiler construction, such as the range, parameters, construction specifications, energy conservation and environmental protection of water-tube boilers.
——Part 2: Materials, designed to determine the material selection and use requirements for pressure and non-pressure elements, stressed members, steel structures and welding materials of water-tube boilers.
——Part 3: Structure design, designed to determine the basic requirements of structure design, welding connection requirements, openings and specific design requirements of various elements (components) of water-tube boilers.
——Part 4: Strength calculation of pressure parts, designed to determine the calculated wall temperature, calculation pressure, permissible design stress value and calculation method for strength design of pressure parts of water-tube boilers.
——Part 5: Fabrication, designed to determine the requirements for marking, cold and hot forming, expansion, welding and heat treatment in the fabrication process of water-tube boilers.
——Part 6: Inspection, testing and acceptance, designed to determine the inspection, test and acceptance requirements of the pressure elements of water-tube boilers and the load-bearing non-pressure elements directly connected with them.
——Part 7: Safety appurtenances and instruments, designed to determine the settings and selection requirements for safety appurtenances and instruments of water-tube boilers.
——Part 8: Installation and operation, designed to determine the requirements for installation, commissioning, quality acceptance and operation of water-tube boiler proper and tubing within the boiler range.
It is unnecessary and impossible for GB/T 16507 to cover all the technical details for the construction and installation of boilers within the application scope, so under the premise of satisfying the basic safety requirements specified in TSG 11 Regulation on safety technology for boiler, the technical contents not specially mentioned in GB/T 16507 shall not be banned.
GB/T 16507 does not restrict the adoption of advanced technical methods that meet safety requirements in actual engineering design and construction.
For the comprehension ambiguities and the resulting consequences caused by the publicizing or interpretation of this standard by other organizations without written entitlement or approval of the Committee, the Committee will not undertake any responsibility.
Water-tube boilers - Part 5: Fabrication
1 Scope
This document specifies the requirements for marking, hot and cold forming, expansion, welding and heat treatment of water-tube boilers in the fabrication process. This document is applicable to the fabrication of water-tube boiler as defined in GB/T 16507.1.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute indispensable 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 5310 Seamless steel tubes and pipes for high pressure boiler
GB/T 16507.1 Water-tube boilers - Part 1: General requirement
GB/T 16507.2 Water-tube boilers - Part 2: Materials
GB/T 16507.3 Water-tube boilers - Part 3: Structure design
GB/T 16507.4 Water-tube boilers - Part 4: Strength calculation of pressure parts
GB/T 16507.6 Water-tube boilers - Part 6: Inspection, testing and acceptance
GB/T 30583-2014 Specification for post weld heat treatment of pressure equipment
JB/T 3223 Welding material quality management specifications
NB/T 47014 Welding procedure qualification for pressure equipment
GB/T 47018 (All parts) Technical permission of welding materials for pressure equipment
NB/T 47055 Painting and packing specification of boiler
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 16507.1 and the following apply.
3.1
cold forming
plastic deformation processing conducted below the recrystallization temperature of the workpiece material
Note: In engineering practice, the plastic deformation processing conducted at room temperature is usually referred to as cold forming; and that above the room temperature to the recrystallization temperature is referred to as warm forming. For ferritic steels with reinforced creep strength 10CAMo1VNbN, 10Cr9MoW2VNbBN, 10Cr11MoW2VNbCu1BN and 11Cr9Mo1W1VNbBN, the bend-forming temperature (t) of steel tube falls below 705℃; for 07Cr2MoW2VNbB steel, the bend-forming temperature (t) of steel tube falls below 605℃.
3.2
hot forming
plastic deformation processing conducted above the recrystallization temperature of the workpiece material
Note: For ferritic steels with reinforced creep strength 10Cr9Mo1VNbN, 10C9MoW2VNbBN, 10Cr11MoW2VNBCu1BN and 11Cr3Mo1W1VNbBN, the bend-forming temperature (t) of steel tube is not below 705℃; for 07Cr2MoW2VNbB steel, the bend-forming temperature (t) of steel tube is not below 605℃.
3.3
tube forming
tube processing such as bending, upsetting, necking and flaring
3.4
nominal thickness of weld
nominal thickness of the weld
Note 1: For full-penetration butt welds, the nominal thickness means the thickness of the thinner welded part.
Note 2: For full-penetration fillet welds, the nominal thickness means the depth of the weld.
Note 3: For partial penetration groove weld and weld for material repairing, the nominal thickness means the depth of the weld. For partial or full penetration groove welds welded from both sides, the sum of the depths on both sides at a given position is taken as the total depth of the weld.
Note 4: For fillet welds, the nominal thickness means the throat height of the weld. When fillet weld and groove weld are used together, the groove weld depth or throat dimension of fillet weld (whichever is greater) shall be taken as the nominal thickness.
Note 5: If there are multiple holes on the drum to form a hole bridge, and their pitch is less than twice the average hole diameter, the nominal thickness means the sum of groove depth and the dimension of fillet weld throat.
4 Basic requirements
4.1 As for boiler pressure elements, their structure shall meet the requirements of GB/T 16507.3 and their strength calculation shall meet the requirements of GB/T 16507.4.
4.2 The design and fabrication process documents shall be consistent with the production conditions of the unit.
4.3 Appropriate process and method shall be adopted for the fabrication of pressure elements without introducing any additional stress and harmful defects that affect safety and use.
4.4 The equipment, instruments and apparatus involved in the fabrication of boiler pressure elements shall conform to the specified accuracy, and shall be verified or calibrated regularly.
4.5 The raw materials shall meet the requirements of GB/T 16507.2 and design drawings.
4.6 The water-tube boiler shall be fabricated and assembled according to the design drawings reviewed and approved by the appraisal organization approved by the nation, the process and technical requirements of the fabrication unit and the corresponding practical engineering experience.
4.7 Boiler fabrication shall be under the supervision and inspection of the supervision and inspection institutions.
4.8 As for element assembly devices such as tubing, temperature and pressure reduction device, flow meter (shell) and factory prefabricated tube section within the scope of utility boiler, fabrication supervision and inspection shall be conducted according to the requirements for boiler components or pressure tubing element assembly devices.
Foreword i
Introduction vi
1 Scope
2 Normative references
3 Terms and definitions
4 Basic requirements
5 Marking
6 Forming, processing and fabrication tolerances
7 Expansion
8 Welding
9 Heat treatment
10 Painting and packing
Annex A (Informative) Tube bending process test
Annex B (Nominative) Supplementary requirements for welding procedure qualification of boiler membrane tube panel
Annex C (Nominative) Classification and grouping of materials for welding procedure qualification of boilers
Bibliography
