Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7773-95
General Technical Conditions for Atmospheric Pressure Hot Water Boilers
Published on 1995-06-16
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1996-07-01
Mechanical Industry Standard of the People's Republic of China
General Technical Conditions for Atmospheric Pressure Hot Water Boilers
Subject Content and Scope of Application
JB/T 7773-95
This standard specifies the model synthesis method, parameter series, technical requirements, testing, inspection, acceptance, marking, packaging, transportation and storage of fixed atmospheric pressure hot water boilers (hereinafter referred to as atmospheric pressure boilers). This standard applies to fixed atmospheric pressure hot water boilers with water as the medium and zero gauge pressure, and does not apply to tea boilers that only provide boiling water. 2 Reference standards
GB1300
GB1576
GB2888
GB5117
GB5468
GB8163
GB10180
GB13271
GB50041
JB1615
JB1620
JB1621
JB3271
ZBJ98010
ZBJ98011
3 Terminology
Carbon cable structural steel
Welding wire
Low-pressure boiler water quality standard
Noise measurement method for fans and Roots blowers Carbon steel welding rods
Boiler smoke test method
Seamless steel pipes for conveying fluids
Industrial boiler thermal test specifications
Boiler air pollutant emission standards
Boiler room design specifications
Technical conditions for steel furnace painting and packaging
Steel structure and manufacturing technical conditions for steel furnaces
Technical conditions for manufacturing smoke boxes and window smoke for industrial boilers Technical conditions for chain grates
Reciprocating grate
Industrial boilers
Technical conditions
General technical conditions
Normal pressure boilers; boilers with openings in the body connected to the atmosphere, and a boiler with a zero gauge pressure at the boiler water level under any operating condition. Normal pressure boiler parameter series
The parameters of normal pressure boilers should generally comply with the provisions of Table 1. Approved by the Ministry of Machinery Industry on June 16, 1995
Implementation on July 1, 1996
Rated thermal power
Allowable working pressure (gauge pressure)
Rated outlet water temperature
Rated inlet water humidity
JB/T7773-95
Parameter series of atmospheric pressure boilers
Note: ①The rated outlet and inlet temperatures can be adjusted according to the local atmospheric pressure and special conditions of use, but the temperature adjustment should be 25K. The rated outlet diameter refers to the value under one atmospheric pressure. ②The parameters in brackets are not recommended.
5 Model compilation method
The product model of atmospheric pressure boilers consists of three parts, and the parts are connected by short horizontal lines. Design sequence
Design fuel code
Rated inlet water temperature
Rated outlet water temperature
Rated thermal power
Combustion equipment code
Boiler type code
Normal pressure boiler code
The first part of the model consists of four sections: normal pressure steel furnace code, steel type code, combustion equipment code, and rated thermal power. 5.1
5.1.1Normal pressure boiler code is represented by \C\. The normal pressure boiler type code is shown in Table 2.
Table 2 Codes of boiler types of atmospheric pressure boilers
Overall type of boiler
Vertical water tube
Vertical fire tube
Boiler type boiler
Water tube boiler
Vertical heat pipe
Horizontal internal combustion
Horizontal external combustion
Horizontal heat pipe
Single boiler vertical
Single boiler interlaced
Single boiler horizontal
Double boiler vertical weight||tt ||Horizontal double drum type
LS (vertical water)
LH (vertical fire)
LR (vertical heat)
WN (horizontal inside)
WW (horizontal outside)
WR (horizontal benefit)
DL (single vertical)
DZ (single vertical)
DH (single horizontal)
SZ (double vertical)
SH (double horizontal))
See Table 3 for the combustion equipment codes of atmospheric pressure boilers.
Combustion equipment
Enclosed guard grate
Moveable hand-cranked grate
Chain grate
Reciprocating guard grate
Example grate
Drawing plate lifting furnace
Chamber combustion furnace
Semi-gas furnace
Jinjiao furnace
JB/T 7773-95
Table 3 Combustion equipment code
5.1.4 Rated thermal power is expressed in Arabic numerals in MW. 5.1.5 The first part should be written continuously and connected to each other. 5.2 The second part of the model indicates the medium parameters, which is divided into two sections, connected by a slash in the middle. Code
H(wine)
L(chain)
W(forward)
A(down)
c(extraction)
s(chamber)
B(half)
F(boiling)
The first section indicates the rated outlet water temperature, and the second section indicates the rated inlet water temperature, in C. 5.3
The third part of the model consists of two sections, fuel type and design sequence, which must be written continuously. 5.3.1
The first section fuel type code is shown in Table 4.
Table 4 Fuel Type Code
Fuel Type
Type Bituminous Coal
Type Bituminous Coal
Type 1 Bituminous Coal
Type 1 Anthracite
Type 1 Anthracite
Type 1 Anthracite
5.3.2 The second paragraph shall be written in Arabic numerals to indicate the design sequence and the first paragraph in a continuous sequence. The prototype design has no second paragraph. 5.4 Model Compilation Example
CLSG0.35-95/70-W12: It indicates a vertical water tube fixed grate for a normal pressure boiler, with a rated thermal power of 0.35MW, a rated outlet water temperature of 95℃, a rated inlet water temperature of 70℃, burning Type 1 anthracite, and a second design boiler. Technical Requirements
Basic Requirements
JB/T 7773--95
Atmospheric pressure boiler products shall be manufactured according to drawings and technical documents approved by the prescribed procedures. 6.2 Performance
6.2.1 The thermal efficiency of atmospheric pressure boilers shall comply with the provisions of Table 1 of ZBJ98011. 6.2.2 The smoke emission of atmospheric pressure boilers shall comply with the provisions of Table 1 of GB13271. 6.2.3 The Class A noise of atmospheric pressure boiler combustion equipment, transmission devices and auxiliary machines shall comply with relevant environmental protection regulations. 6.3 Structure
6.3.1 Basic requirements
6.3.1.1 Atmospheric pressure boilers shall have sufficient strength, rigidity, stability and 6.3.1.2 The heating surfaces of all parts should be reliably cooled to prevent vaporization and supercooling boiling. 6.3.1.3 All parts of the atmospheric pressure boiler should be able to expand freely in the designed predetermined direction during operation. 6.3.1.4 The structure of the atmospheric pressure boiler should be easy to install, repair and clean the inside. 6.3.2 The wall thickness of the boiler shell shall not be less than 4mm, and the wall thickness of the furnace shall not be less than 6mm. 6.3.3 The minimum safe water level of the shell boiler shall be 100mm higher than the highest fire level. 6.3.4 The water inlet and outlet of the atmospheric pressure boiler shall be equipped with a thermometer, and the water level gauge shall be installed at the water level line of the boiler body, and it shall be convenient to install, inspect and clean the boiler. For observation and operation. The installation and use of the above instruments shall comply with relevant regulations. 6.3.5 A hole shall be opened at the highest point of the atmospheric pressure steel furnace body, and ensure that it is directly connected to the atmosphere. The equivalent diameter of the hole shall not be less than the value calculated by the following formula (including the diameter of the connecting pipe of the boiler body to the open water tank). D-20+88/Q
Wherein; D is the equivalent diameter of the hole. mm:
Q is the rated thermal power of the atmospheric pressure boiler, MW.
6.3.6 An over-water overflow pipe shall be installed at the highest water level of the atmospheric pressure boiler, and a drain valve shall be installed at the lowest position of the boiler shell and the lower header of each circuit. 6.3.7 Fuel gas, oil Boilers that use pulverized coal and coal should be equipped with necessary safety protection devices. 6.4 Manufacturing
6.4.1 Material requirements
6.4.1.1 The heating surface materials, welding rods and welding wires used in normal pressure boilers should have quality certificates. 6.4.1.2 The materials used in normal pressure boilers should comply with the provisions of GB700 not lower than Q235 and the provisions of GB8163. 6.4.1.3 The welding rods used in normal pressure boiler welding materials should comply with the provisions of GB5117. The welding wires should comply with the provisions of GB1300. 6.4.2 Boiler shell and furnace manufacturing
6.4.2.1 The shortest length of the boiler shell and furnace when splicing is not less than 300mm. There are no more than two directional welds in each section of the boiler shell, and the length of the outer arc between the center lines of the two welds should be no less than 300mm. 6.4.2.2 The edge deviation of the butt weld key shall not exceed 30% of the nominal plate thickness and shall not exceed 2.mm. The head should be made of a whole piece of copper plate, and generally no more than two pieces are required for splicing. 6.4.2.3
Fillet welds can be used to connect the shell and the flat tube plate. 6.4.2. 41
The push-tube hole should not be opened on the weld, etc.,
6. 4. 2. 6
The manufacturing geometric dimension deviations of boiler shell, head and furnace are shown in Table 5. Table 5 Geometric dimension deviation
Nominal size
1000~1500
Length deviation
Shell, furnace
Diagonal deviation\
Note: 1) Refers to the diagonal of the shell outer dimensions of the square box-type boiler. Joint angle
Screen body, head, furnace
Inner diameter deviation
Flatness
6.4.3 Manufacturing of heating surface pipes
JB/T 7773-95
6.4.3.1 The pipe butt edge deviation shall not exceed 10% of the nominal thickness of the pipe plus 1mm. 6.4.3.2 The pipe bending radius shall be greater than 1.5 times the outer diameter of the pipe, and the bending angle deviation shall not exceed ±1.5°6.4.3.3 The length of the heating surface pipes is allowed to be butt-jointed. When the length is less than 2m, two pipes can be butt-jointed. 6.4.4 Manifold manufacturing
When the length of the header is less than 2m, it shall not be butt-jointed. When the length is greater than 2m, two pipes can be butt-jointed, and the shortest section length shall not be less than 500mm. The butt weld edge deviation shall not exceed 10% wall thickness plus 1mm. 6.4.5 The manufacture of smoke diagrams and smoke boxes shall comply with the requirements of JB1621, and 6.4.6 The manufacture of atmospheric pressure boiler structures shall comply with the requirements of JB1620. 6.4.7 Welding
6.4.7.1 Welders shall be trained. The weld size shall comply with the requirements of the drawings and process documents. 6.4.7.2 Welding shall not be carried out when the ambient temperature is below 0℃ and in rain, snow, fog, outdoor work, etc. Before welding, the surface of the weld shall be cleaned, and the oil, rust and other debris that affect the welding quality at the weld shall be removed. 6.4.7.3 Weld quality requirements: the weld height shall not be lower than the parent material, and the transition with the parent material shall be smooth. There shall be no cracks, arc pits and undercuts exceeding 0.5mm deep on the weld key surface and the heat affected zone surface. 6.4.8 Assembly of atmospheric pressure boilers
6.4.8.1 The extension length of the tube end of the tube sheet shall not exceed 1.5mm when the smoke temperature is >600℃, and shall not exceed 5mm when the smoke temperature is ≤600℃. The maximum length of the tube extending into the inner wall of the header shall not exceed 10mm. 6.4.8.2 The flatness of the tube sheet after the assembly of the body shall not exceed the provisions of Table 5. 6.4.8.3 The inclination, offset and flange inclination of various pipe joints on the cylinder, head and header shall not exceed 2mm. 6.4.8.4 After the assembly of atmospheric pressure boilers is completed, a water pressure test shall be carried out with a test pressure of 0.2MPa. During the pressure test, the ambient air temperature shall not be lower than 5C, the water temperature shall not be lower than the dew point temperature, the pressure stabilization time shall be 5min, there shall be no water droplets and water mist on the metal wall and weld of the pressure test component, and no residual deformation shall be found, which means the water pressure test is qualified.
6.4.9 The paint and packaging of atmospheric pressure boilers shall comply with the provisions of JB1615. 7 Appraisal
7.1 New products must be appraised. Products that have not been appraised or have failed the appraisal shall not be produced. If the structure of the imported products from other factories is not changed and there are complete appraisal materials, only process appraisal is required, and product appraisal is not required. 7.2 The appraisal content includes product structure design, process performance, thermal performance, safety performance, environmental protection performance, supporting auxiliary equipment, technical data, product standardization and economic and technical analysis.
7.3 The following materials should be provided for the appraisal of new products: a.
Appraisal outline:
General drawing of boiler, drawings of main components, main process documents; design task book:
Thermal calculation book (≥0.7MW silver furnace):
Smoke and wind resistance calculation book (≥0.7MW boiler); opening equivalent diameter calculation book,
Hydrodynamic calculation book:
Thermal test report:
Smoke emission and noise test report:
Main parts quality inspection report:
Process review report:
Technical and economic analysis report:
Trial production summary report;
Standardization review report:
Installation and use instructions;
User usage report;
The above drawing file catalog.
The appraisal should be hosted by the provincial and municipal machinery departments. Test, inspection, and acceptance
JB/T7773-95
8.1 Product tests must be carried out for newly designed or significantly improved products. 8.2 Product tests should include: determination of rated thermal power and thermal efficiency of pressure boilers, determination of smoke emission concentration and blackness, and determination of indole noise.
8.3 Test methods
8.3.1 Thermal tests are carried out on rated thermal power and thermal efficiency of boilers in accordance with GB10180. 8.3.2 Determination of smoke emission and blackness of boilers is carried out in accordance with GB5468, and noise is measured in accordance with GB2888. 8.4 Inspection
8.4.1 The manufacturing quality of atmospheric pressure boilers shall be inspected in accordance with the provisions of relevant standards. 8.4.2 The quality of welding is inspected by visual inspection and weld inspection ruler. 8.4.3 The tightness of atmospheric pressure boilers is inspected by water pressure test. 8.5 Each pressure boiler must be inspected and qualified by the quality inspection department of the manufacturing unit according to the design drawings and the various provisions of this standard, and a product quality certificate must be issued before it can leave the factory.
The product quality certificate should include the following: Name, model, and main technical specifications of the atmospheric pressure boiler: 8.
Material certification of steel cylinders, furnaces, heating surface pipes, and headers: Material certification of welding materials;
Hydraulic pressure test report.
8.6 Qualified product conditions
Key product inspection items are shown in Table 6, and the qualified rate is 100%. Table 6 Inspection items
Rated thermal power
Measured thermal efficiency
Weld quality
Hydraulic pressure test
Drain test
Combustion and winding equipment rotating device test
Smoke exhaust concentration, blackness
Material, welding rod, welding wire
Auxiliary machine noise
Product completeness
Random documents
Inspection requirements
Design requirements
ZB J98 011
This standard 6.4.7Www.bzxZ.net
This standard 6.4.8.4
JB3271 or ZBJ98010
Flexible rotation, no jamming, no noise, no oil leakage GB13271
Quality certificate
This standard 8.3.2.ZBJ98011
This standard 8.7
This standard 9.2
8.7The scope of boiler supporting supply shall comply with the following provisions: a.
Atmospheric pressure boiler body;
Ancillary machine;
Atmospheric pressure boiler accessories:
Factory technical data.
JB/T7773—95
8.8 The atmospheric pressure boiler manufacturer shall be responsible for the product quality and strictly implement the relevant provisions of the "Product Quality Law of the People's Republic of China". Marking, packaging, transportation and storage
Atmospheric pressure boilers should be equipped with fixed metal signs in obvious positions, and the content should include: a.
Product model and name;
Rated thermal power:
Rated outlet water temperature, rated inlet water temperature Manufacturer name:
Factory number:
Date of manufacture.
9.2 The atmospheric pressure boiler should provide the following technical information when it leaves the factory: a.
General drawing, foundation drawing, installation drawing, piping system drawing, and wearing parts drawing of the atmospheric pressure boiler; Product installation and operation instructions:
Quality certificate;
General list of materials;
Packing and shipping list.
9.3 Avoid collision and damage when transporting atmospheric pressure boilers. 9.4
Wide pressure boilers should avoid contact with corrosive substances such as acids and alkalis. 10
Usage conditions of atmospheric pressure boilers
The installation and operation of atmospheric pressure steel furnaces should be carried out in accordance with the boiler installation and operation instructions provided by the manufacturer. The characteristics of the fuel used in atmospheric pressure boilers should comply with the fuel types specified in the design. 10.2
The water quality of atmospheric pressure boiler feed water and boiler water should comply with the provisions of GB1576. 10.4
The operators of atmospheric pressure boilers should be trained and operate in strict accordance with the operating procedures. Atmospheric pressure boilers can be installed in the basement, semi-basement or other levels of a building. 10.5
After the atmospheric pressure boiler is in operation and shut down, take reliable measures to prevent corrosion. 11 System
11.1. The system should be equipped with a device to prevent the backwater from overflowing when the pump is stopped. 11.2. The system should be equipped with an automatic or manual water replenishment device. 11.3. The system should have reliable constant pressure measures and equipment to ensure the expansion of circulating water (including cooling). 11.4. The system should have a device to prevent water hammer accidents caused by pump stop. 11.5. Reliable measures should be taken to prevent negative pressure from occurring in the system. 11.6. The circulating water system should use a hot water pump, and ensure that the boiler water level line and the center line of the water pump have a sufficient height, and minimize the resistance of the water system inlet pipe end to prevent vaporization.
11.7. The use of atmospheric pressure boilers in high-rise buildings should be subject to necessary economic analysis. 11.8. In addition to the above provisions, the system should also comply with the relevant provisions in GB50041. 7
Additional Notes:
JB/T7773-95
This standard is proposed and managed by the Shanghai Industrial Boiler Research Institute of the Ministry of Machinery and Nuclear Industry. This standard was drafted by Shanghai Industrial Boiler Research Institute, and was drafted by Taiyuan Atmospheric Pressure Boiler Research Institute, Dalian Boiler Pressure Vessel Inspection Institute, Shanxi Provincial Labor Department Walu Pressure Vessel Inspection Institute, Zhengzhou Atmospheric Pressure Boiler Factory, Fannan Chenzhou Air Conditioning Equipment General Factory, Xi'an Atmospheric Pressure Group Corporation and other units.
The main drafters of this standard are Jiang Yufang, Lu Zili, Lu Daozhi, Huang Kaoming, Zhang Ruihua, Liu Songmao, and Luo Kewan.
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