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
GB/T 16507.3-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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 s...