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GB/T 16507.3-2022 English PDF (GBT16507.3-2022)

GB/T 16507.3-2022 English PDF (GBT16507.3-2022)

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GB/T 16507.3-2022: Water-tube boilers - Part 3: Structure design

This document specifies the requirements for the structure design of water-tube boiler drum, start-up (steam water) separator, water storage tank, header, desuperheater, piping, water-cooling wall, superheater, reheater, coal economizer, pipe joint, suspender, opening, door hole, rigid beam, steel structures, escalator and platform. This document is applicable to the structural design of water-tube boilers defined in GB/T 16507.1.
GB/T 16507.3-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.060.30
CCS J 98
Replacing GB/T 16507.3-2013
Water-tube boilers - Part 3: Structure design
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 8
4 Basic requirements ... 9
5 Solder connection requirements ... 11
6 Opening ... 19
7 Drum ... 23
8 Start-up (steam water) separator and storage tank ... 24
9 Header and piping ... 24
10 Desuperheater ... 25
11 Furnace (water-cooling wall) ... 25
12 Superheater and reheater ... 26
13 Coal economizer ... 27
14 Hanging-supporting devices ... 27
15 Rigid beam ... 28
16 Boiler steel structure and escalator as well as platform ... 28
Bibliography ... 30
Water-tube boilers - Part 3: Structure design
1 Scope
This document specifies the requirements for the structure design of water-tube boiler drum, start-up (steam water) separator, water storage tank, header, desuperheater, piping, water-cooling wall, superheater, reheater, coal economizer, pipe joint, suspender, opening, door hole, rigid beam, steel structures, escalator and platform. This document is applicable to the structural design of water-tube boilers defined in GB/T 16507.1.
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/T 985.1, Recommended joint preparation for gas welding, manual metal arc welding, gas-shield arc welding and beam welding
GB/T 985.2, Recommended joint preparation for submerged arc welding
GB/T 2900.48, Electrotechnical terminology of boilers
GB 4053 (all parts), Safety requirements for fixed steel ladders and platform GB/T 16507.1, Water-tube boilers - Part 1: General requirements
GB/T 16507.2, Water-tube boilers - Part 2: Materials
GB/T 16507.4, Water-tube boilers - Part 4: Strength calculation of pressure parts GB/T 22395, Specification for design of boiler steel structures
JB/T 6734, Calculation method of strength of boiler fillet welding seam JB/T 6735, Calculation method of strength of boiler hanger rod
3 Terms and definitions
The following terms and definitions defined in GB/T 2900.48 and GB/T 16507.1 apply to this document.
4 Basic requirements
4.1 The basic principles of boiler design shall comply with the provisions of GB/T 16507.1.
4.2 During the design, the calculation loads to be considered and the load calculations to be performed shall be determined according to the provisions of this document and the special requirements of GB/T 16507.1 and GB/T 16507.4.
4.3 The design shall ensure that the wall temperature of the element does not exceed the allowable temperature of the material used. In addition, factors such as the temperature difference between the inner and outer walls of the tube on the heating surface and the inner wall's resistance to steam oxidation must also be considered. The selection of materials shall meet the requirements of GB/T 16507.2.
4.4 During the design, the minimum required thickness of the pressure elements shall be determined according to the relevant strength calculation formula or stress analysis calculation formula and regulations in GB/T 16507.4. For non-pressure element bearing loads, their calculation dimensions shall be determined in accordance with relevant regulations.
4.5 The design shall ensure that the evaporation heating surface, superheater, reheater and coal economizer system work reliably under the expected operating conditions. Ensure stable hydrodynamic properties. Prevent heat transfer from deteriorating. 4.6 The structure of the furnace, cladding wall and tail flue shall have sufficient bearing capacity. Prevent permanent deformation and furnace wall collapse. There shall be good sealing.
4.7 The expansion coefficient of the flat steel in the membrane wall structure shall be similar to that of the pipe. The determination of the width of the flat steel shall ensure that the allowable temperature of the material is not exceeded during the operation of the boiler. The weld structure shall ensure the effective cooling of the flat steel. 4.8 The load-bearing structure shall have sufficient strength, rigidity, stability and corrosion resistance when bearing the design load.
4.9 The furnace wall shall have good heat insulation and sealing.
4.10 The design of each component shall ensure that it can expand freely according to the design predetermined direction during operation. The expansion center determined in the design of the suspended boiler proper shall be fixed. An expansion guiding device shall be provided to ensure that the furnace body expands in a predetermined direction. For boilers with a rated pressure of not less than 9.8 MPa, when the equipment and fixed structure cannot withstand instantaneous loads such as safety valve discharge reaction force and earthquake force, damping devices shall be installed at appropriate under various startup modes.
4.20 When the DC power station boiler adopts an external start-up (steam-water) separator to start the system, the working pressure of the isolation valve shall be determined according to the design pressure under the maximum continuous load. The strength of the start-up (steam-water) separator is designed and calculated according to the design parameters of the boiler?€?s minimum DC load. When the built-in start-up (steam-water) separator is used to start the system, the strength of each component shall be calculated according to the design parameters of the maximum continuous load of the boiler.
4.21 For control circulation boilers, low circulation ratio boilers and supercritical pressure composite circulation boilers, the layout of the boiler water circulation pump (starting circulation pump) and its inlet pipes shall prevent vaporization of the working medium in the pipe and at the pump inlet.
4.22 The pipe clamps, hangers, and clamping pipes on the heating surface shall be set reasonably and reliably. Prevent overheating, burning, straining and causing pipes to collide and rub against each other.
4.23 The boiler structure shall be convenient for installation, operation, maintenance and internal and external cleaning.
5 Solder connection requirements
5.1 The strength calculation of boiler fillet welds shall comply with the provisions of JB/T 6734.
5.2 The main welds of pressure elements and their adjacent areas shall avoid welding accessories as much as possible. If it is unavoidable, the weld of welding accessories may pass through the main weld but shall not terminate in the main weld and its adjacent area.
5.3 The distance (L) between the centerlines of the butt welds on the pipes on the heating surface of the boiler (except dissimilar steel joints) and the straight sections of the pipes shall meet the following requirements:
a) The outer diameter is less than 159mm, L???2 times the outer diameter; b) The outer diameter is not less than 159mm, L???300mm.
When the boiler structure is difficult to meet the above requirements, the heat-affected zones of the butt welds shall not overlap, and L???50mm.
5.4 The butt welds of pipes on the heating surface (except for coiled pipes and formed pipe fittings) shall be located on the straight section of the pipe. The distance from the center line of the butt weld of the pipe on the heating surface to the outer wall of the drum and header, the starting point of the pipe bending, and the edge of the pipe support is at least 50mm. For boilers with a rated working pressure of not less than 3.8MPa, the distance shall be at least 70mm (except for dissimilar steel joints limited by the structure).
5.5 The longitudinal and circumferential butt welds of the drum, start-up (steam-water) separator, water storage tank, header, pipe and pipe, and the splicing weld of the head shall adopt a full penetration structure.
5.6 The longitudinal welds of two adjacent drum sections on the drum (except for those with unequal wall thickness), and the splicing welds of the head and the longitudinal welds of adjacent drum sections shall not be connected to each other. The distance between the centerlines of the welds (external arc length) shall be at least 3 times the thickness of the thicker steel plate, and not less than 100mm.
5.7 For a boiler drum formed by pressing and welding two steel plates with unequal wall thickness, the longitudinal joints of two adjacent drum sections are allowed to be connected. However, the intersection of welds shall be qualified by radiographic inspection.
5.8 Generally, the centerlines of the steel plates on both sides of the longitudinal and circumferential seams of the drum shall be aligned. When the thickness of the steel plates on both sides of the ring seam of the drum is not equal, the edge of one side is also allowed to be aligned. When two elements or steel plates with different nominal thicknesses are butted, if the difference in nominal edge thickness of any of the two sides exceeds the edge deviation value specified in 5.9, the edge of the thick plate shall be cut to be flush with the edge of the thin plate. The chamfered surface shall be smooth. The slope is not greater than 1:3. If necessary, the width of the weld can be calculated within the slope, as shown in Figure 1.
6.3.1 The number and position of manholes, head holes, hand holes, cleaning holes, inspection holes and observation holes opened on boiler pressure elements shall meet the needs of installation, maintenance, operation monitoring and cleaning. 6.3.2 The connection between manhole ring and head hole ring of pressure elements of the boiler and drum body and head shall adopt full penetration structure. 6.3.3 The manhole cover, head hole cover and hand hole cover on the pressure elements of the boiler with a rated pressure not less than 3.8MPa shall adopt an internally closed structure or a welded structure. The manhole cover, head hole cover and hand hole cover on the pressure elements of the boiler with rated pressure less than 3.8MPa can adopt flange connection structure.
6.3.4 For boilers with a drum inner diameter not less than 800mm, manholes shall be provided on the drum body or head. When personnel cannot enter the boiler due to structural restrictions, only the head hole may be opened. For boilers with an inner diameter of the drum less than 800mm, at least one head hole shall be provided on the drum body or head.
6.3.5 The elliptical manhole on the boiler pressure element shall not be less than 280mm??380mm. The diameter of the circular manhole shall not be less than 380mm. The minimum sealing plane width of the manhole circle is 19mm. The total gap between the shoulder of the manhole cover and the manhole ring shall not be greater than 3mm (not more than 1.5mm at each point along the circumference). The depth of the groove in the cover plate shall be such that it can completely accommodate the gasket. 6.3.6 The elliptical head hole on the boiler pressure element shall not be less than 220mm??320mm. The height of the neck or hole ring shall not be greater than 100mm. The minimum sealing plane width of the head hole ring is 15mm.
6.3.7 The inner diameter of the upper hand hole of the boiler pressure element shall not be less than 80mm. The height of the neck or hole ring shall not be greater than 65mm. The minimum sealing plane width of the hand hole ring is 6mm.
6.3.8 On the boiler pressure element, the inner diameter of the cleaning hole shall not be less than 50mm. The neck height shall not be greater than 50mm.
6.3.9 Due to structural reasons, when the height of the neck or hole ring exceeds the requirements in 5.3.6~5.3.8, the size of each hole shall be enlarged appropriately. 6.3.10 When the handhole cover and the hole ring of the header are connected by non- welding, they shall not be in direct contact with the flame.
6.3.11 For pressure elements that require radiographic inspection of welds, when the radiation source needs to be placed inside the cylinder for transillumination and there is no suitable opening for use, a radiographic inspection hole shall be provided. 6.4 Furnace wall door hole
6.4.1 The oval manhole on the furnace wall is generally not less than 400mm??450mm. The diameter of the circular manhole is generally not less than 450mm. Rectangular manholes are generally not less than 300mm??400mm.
6.4.2 For boilers with slight positive pressure combustion, the furnace wall, flue and door openings of various parts shall be reliably sealed. The fire viewing hole shall be equipped with an interlock device to prevent flame from blowing out.
6.4.3 Manhole doors in furnace walls shall be fitted with strong latches. The hole cover of the monitoring hole on the furnace wall shall be guaranteed not to be washed away by the flue gas.
6.4.4 For water-tube boilers burning pulverized coal, oil, gas and other fuels that may cause deflagration with a rated evaporation capacity not greater than 75t/h, when the furnace safety automatic protection system is not installed, explosion-proof doors shall be installed in the furnace and flue. The setting of explosion-proof doors shall not endanger personal safety.
7 Drum
7.1 The nominal thickness of the drum body shall not be less than 6mm. When the heating surface tube and the drum are connected by expansion joints, the nominal thickness of the drum body shall not be less than 12mm. The net distance between the holes of expansion joints shall not be less than 19mm.
7.2 When the heating surface tube and the drum are connected by expansion joints, the wall thickness of the tube shall not be greater than 5mm; the outer diameter of the tube shall not be greater than 89mm.
7.3 The length of the shortest drum section on the drum body shall not be less than 300mm.
7.4 The head is made of a whole piece of steel plate as much as possible. When splicing is necessary, two steel plates are allowed to be spliced together. The distance from the splicing weld to the centerline of the head is not greater than 30% of the nominal inner diameter of the head. It shall not pass through the pulling-edge manhole. Splicing welds shall also not be arranged on the arc of the edge of the manhole.
7.5 The center distance between the drum suspender and the circumferential weld of the drum shall not be less than 200mm. The longitudinal cylinder welds within 180?? of the lower part of the drum body at the suspender position shall be ground flat. 7.6 For steam boilers with a rated steam pressure greater than 0.8MPa, any connecting pipes (such as water supply pipes, dosing pipes) that can cause local thermal fatigue of header of the water-cooled wall shall be provided with a regular sewage discharge device.
9.3 Corresponding hand holes or inspection holes shall be installed on the header according to the needs of manufacturing and maintenance.
9.4 Reliable anti-wear and heat insulation measures shall be taken for headers washed by flue gas.
9.5 When the two pipe fittings are butt-connected, corresponding measures shall be taken to ensure the conditions for non-destructive testing of the weld. 10 Desuperheater
10.1 For steam boilers with a rated pressure greater than 0.8MPa, the desuperheater water pipe of the spray desuperheater shall be equipped with a sleeve at the place where it passes through the desuperheater cylinder.
10.2 The space between the cylinder and the inner liner of the water spray desuperheater and between the water spray pipe and the pipe seat shall be able to expand freely. There shall be no resonance.
10.3 The length of the inner liner of the spray desuperheater shall meet the requirements of water vaporization. When the inner liner adopts a spliced structure, the spliced welds shall adopt a full penetration structure.
10.4 The structure and arrangement of spray desuperheater shall be easy to repair. An inspection hole with an inner diameter of not less than 80mm shall be provided. Inspection holes shall be located to facilitate endoscopic inspection of inner liners as well as sprinkler pipes.
10.5 The structure of the cooling water pipe of the surface desuperheater shall be able to prevent thermal fatigue cracks of the cooling water pipe.
10.6 When the two table-top desuperheaters are arranged symmetrically from left to right, the arrangement of the cooling water inlet and outlet pipes shall be able to prevent steam lock and pulsation in the desuperheater.
11 Furnace (water-cooling wall)
11.1 The water-cooling wall shall adopt membrane tube panel structure. Ensure the tightness of the furnace.
11.2 Furnace water-cooling wall shall ensure sufficient mass flow rate in its tube, so as to maintain the hydrodynamic stability of the water-cooling wall and the heat transfer protection plates, so as to prevent the tubes from being blown.
12.6 The highest point of the superheater and reheater shall be provided with a pipe seat and valve for discharging air.
12.7 A drain valve shall be installed at the lowest header (or pipeline) of the superheater system and reheater system.
12.8 Superheater and reheater tube bundles shall take measures such as positioning or fixing devices to prevent shaking and abnormal vibration during operation. No rubbing occurs.
12.9 Sufficient space for inspection and cleaning shall be left between the superheaters at all levels and the heating surface tube groups of the reheaters.
13 Coal economizer
13.1 The design of the economizer shall fully consider the protection measures of ash particle wear. When necessary, a baffle plate shall be installed between the economizer tube bundle and the surrounding walls to prevent flue gas from drifting. A reliable anti- wear device shall also be provided on the tube bundle.
13.2 Within the effective range of the soot blower, the economizer and its suspension pipes shall be equipped with anti-wear guards, so as to prevent blowing damage to the pipes.
13.3 The economizer shall be self-draining. The lowest header (or piping) shall be equipped with a drain connection seat with corresponding valves.
13.4 At the highest point of the economizer, a connection seat and a valve for discharging air shall be provided.
13.5 Between the heating surface tube groups such as the economizer arranged in the flue at the rear of the boiler, there shall be a space of sufficient height to facilitate access for maintenance and cleaning.
13.6 For drum boilers, in order to ensure the cooling of the economizer during the start and stop process, recirculation pipes shall be installed, or other protective measures shall be taken.
14 Hanging-supporting devices
14.1 The hanging-supporting device shall have sufficient strength. The strength of each stressed member shall be calculated according to the load and displacement under various operating conditions. Stiffness and stability calculations shall also be performed if necessary.
14.2 The setting of the hanging-supporting device shall meet the overall layout of the boiler and the layout requirements of the supported pressure parts.
14.3 The hanging-supporting device shall be simple and reasonable in structure and easy to install. A mature, reliable and economical str...

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