Some standard content:
ICS 75.160; 25.180
Registration No.: 8136-2001
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5262-2000
Specification for fire tube type heater2000-12-25Release
State Petroleum and Chemical Industry Bureau
2001-06-01Implementation
SY/T 5262-—2000
2 Reference standards
3 Definitions
4 Basic data and furnace type selection
Process design
Strength design
Structural design
Accessories and instruments·
10 Processing, forming and assemblybzxz.net
Pressure test
Factory documents, marking, painting, packaging and transportation 13
SY/T 5262—2000
This specification is supplemented, revised and merged with SY/T5262—91 “Technical Conditions for Fire Tube Heating Furnaces” and SY/T5263—91 “Technical Regulations for Design of Fire Tube Heating Furnaces” (hereinafter referred to as the original standards) in accordance with the requirements of the Notice No. 34 of 1999 on Issuing the “1999 Petroleum and Natural Gas Industry Standard Revision Item Plan” issued by China National Petroleum Corporation. In order to meet the needs of design, manufacture, inspection and acceptance of fire-tube heating furnaces, combined with the actual on-site operation experience of fire-tube heating furnaces, the original standard content, format, etc. have been supplemented and revised to make it more advanced, applicable, instructive and coordinated with other standards. The main revisions are as follows: a) Added "Foreword" and Chapter 3 "Definition"; b) The design pressure of the shell and coil, the average heat flux density of the heating surface of the fire-tube heating furnace, the exhaust gas temperature and other parameters in the original standard have been appropriately revised:
c) Added the corresponding provisions for the strength of the pressure components and the verification calculation; d) Supplemented the "Refractory Materials" section, deleted the original standard bolt material 25* steel, nut A2, 15+ steel and steel plate material A steel:
e) Due to the update of relevant standards, this standard has made corresponding revisions to the manufacture, inspection and acceptance of fire-tube heating furnaces; 1) Chapter 12 added the test pressure requirements for atmospheric pressure water jacket furnaces. This standard will replace SY/T5262-91 and SY/T526.3-91 from the date of effectiveness. This standard was proposed by China National Petroleum Corporation. This standard is under the jurisdiction of China National Petroleum Corporation Planning and Design Institute. This standard was drafted by Daqing Oilfield Construction Design Institute. The main drafters of this standard are Yang Jingfu, Liu Feng, Xiaolin, and Jin Guohui. SY/T5262-91 was first issued in December 1991, and SY/T5263-91 was first issued in July 1991. This is the first combined revision:
This specification is entrusted to Daqing Oilfield Construction Design Institute for interpretation. 1 Scope
People's Republic of China Oil and Gas Industry Standard Specification for Fire Tube Type Heater
Specification for fire tube type heater The standard specifies the basic requirements for the design, manufacture, inspection and acceptance of fire tube type heaters. SY/T 5262—2000
Replaces SY/T 5262--91
SY/T5263—91
This specification applies to the design, manufacture, inspection and acceptance of fire-type heating furnaces used in onshore oil and gas production. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GJ150—1998 Steel pressure vessels
GB/I699—1999 High quality carbon structural steel
GB/T700—1988 Carbon structural steel
GB713·1997 Boiler steel plate
(H3/)912—1989 Carbon structural steel and low alloy structural steel hot rolled thin steel plate and steel stripGI3/T 983 1995
GB/r 985--1988
GB/P 986--1988
Stainless steel welding rod
Basic form and size of weld groove for arc welding and gas shielded weldingBasic form and size of weld groove for arc weldingGB/T3077—1999 Alloy structural steel
Seamless steel pipe for low and medium pressure boilers
GB 3087---1999
GH/1 3274—1988
Carbon structural steel and low alloy structural steel, hot rolled thick steel plate and steel stripGB/T 5117—J995
G/T 5118--1995
GB/T 5293—1999
Carbon steel welding rods
Low alloy steel welding rods
Magnetic carbon steel welding wire and flux for submerged arc welding
Seamless steel pipe for high pressure boiler
G3 5310--1995
GB 6479—1986
High-pressure seamless steel pipe for fertilizer equipment
G136654—1996Steel plate for pressure vessel
B/T8163—1999Seamless steel for conveying fluidG13/T 12459—1990
GB/[ 13401—1992
Steel butt-welding seamless pipe fittings
Steel plate butt-welding pipe fittings
Steel wire for fusion welding
GB/T 14957—1994
G3/T 14958--1994
Steel wire for gas shielded welding
GB/T 14982-1994 Refractory slurry GR51205--95 Construction and acceptance specification for steel structure 1 GB/T50235-1997 Construction and acceptance specification for industrial metal pipeline engineering JB/T1611-93 Technical conditions for boiler pipes JB/T1613-93 Technical conditions for welding of boiler pressure components State Bureau of Petroleum and Chemical Industry 2000-1225 Approved 2001-06 ~ 01 Implementation
JB/T161591
JB/T1619—93
JB/T162392
SY/T5262—2000
Technical conditions for boiler painting and packaging
Technical conditions for general assembly of shell boiler body
Deviation of center distance of boiler tube hole
JB/T1625-—93
Dimensions of welding tube hole of medium and low pressure boiler
IB2536-- 80
JB3375—91
JB470892
Painting, packaging and transportation of pressure vessels
Inspection of boiler raw materials before entering the factory
Qualification of welding process for steel pressure vessels
JB/T4709—92 Welding regulations for steel pressure vesselsJB/T4712—92
JB4726—94
Saddle support
Carbon steel and low alloy steel forgings for pressure vesselsJB4730 —94
Nondestructive testing of pressure vessels
JB/T4735—1997 Steel welded atmospheric pressure vesselsJB/T4736—-95 Reinforcement ring
JB/T4737—95 Elliptical head
SY0031—95 Safety regulations for heating furnaces used in the petroleum industrySY/T0510—1998 Steel butt-welded pipe fittings
SY/T0535-—94 Calculation method of heat and resistance of fire-type heating furnaceSY/T0540—94
Types and basic parameters of heating furnaces in the petroleum industrySY/T0599—1997Requirements for metal materials resistant to sulfide stress cracking in natural gas surface facilitiesSY/T5261—91Calculation method for strength of pressure-bearing components of fire tube heating furnaceYB/T5106-93
Clay refractory bricks
DL/T504895
5Technical specifications for construction and acceptance of electric power construction - Ultrasonic inspection of pipeline welding joints 3 Definitions
This standard adopts the following definitions.
3.1 Fire tube type heating furnacefiretubetypeheaterA heating furnace in which a fire tube is arranged in a metal cylindrical shell to transfer heat is called a fire tube type heating furnace. 3.2 Direct-heated fire tube type heating furnacedirect-heatedheaterA fire tube type heating furnace in which the heated medium is directly heated by the fire tube in the shell is called a direct-heated fire tube type heating furnace, or fire tube furnace for short. 3.3 Indirect-heatcdheater Indirect-heatcdheater A fire-tube heating furnace in which the heated medium is heated by an intermediate heat carrier in a coil (a heat transfer element made of welded steel pipes and fittings) in the shell, and the intermediate heat carrier is directly heated by the fire tube, is called an indirect-heating furnace. An indirect-heating furnace in which the intermediate heat carrier is water is referred to as a water-jacketed furnace. A water-jacketed furnace whose shell works under normal pressure is referred to as a normal-pressure water-jacketed furnace. 3.4 Firetube firetube
In a fire-tube heating furnace, the element that has the function of a combustion chamber and mainly transfers radiant heat is called a fire tube; the element that is connected to the fire tube and mainly performs convection heat exchange is called a smoke tube; the fire tube and the smoke tube are collectively referred to as a fire tube. 3.5 Working pressure workingpressure
refers to the maximum pressure that may be reached at the top of the shell of a fire tube heating furnace (or in the coil of a water-jacketed furnace) under normal working conditions. 3.6 Design pressure designpressure
refers to the pressure used to determine the thickness of the shell and pressure components of the fire-type heating furnace at the corresponding design temperature, that is, the design pressure marked on the nameplate, and its value should not be less than the working pressure. 3.7 Design temperature designtemperature2
SY/T5262-2000
refers to the highest temperature that the shell wall or component metal may reach under the corresponding design pressure during the normal operation of the fire-type heating furnace. When different temperatures may be generated in various parts during the working process, the expected different temperatures are taken as the design temperatures of the corresponding parts. 3.8 Exhaust temperature temperatureoffluegastakenfromthebaseofstack refers to the flue gas temperature at the outlet of the smoke pipe at the bottom of the smokestack. 4 Basic data and furnace type selection
4.1 Basic data
4.1.1 Medium
a) Type, composition, density, specific heat capacity, viscosity, medium flow rate (including maximum and minimum flow rates), gas-oil ratio, water content and sand content of the heated medium.
b) Operating temperature, operating pressure and allowable pressure drop of the heated medium at the inlet and outlet 4.1.2 Fuel
Type, composition, temperature, pressure, density, viscosity of the fuel and type, temperature and pressure of the fuel oil atomizer. 4.1.3 Site conditions
a) Basic wind pressure value of the use area, earthquake fortification intensity, site soil type, snow load, atmospheric pressure, atmospheric temperature, relative humidity of air, etc.
b) Environmental protection requirements and other data.
4.2 Furnace type and scope of application
4.2.1 The design pressure of the shell of the water jacket furnace should not be greater than 0.44MPa, and the design pressure of the coil should not be greater than 32MPa4.2.2 The design pressure of the shell of the fire tube furnace should not be greater than 0.66MPa. 4.2.3 The heated medium is crude oil, natural gas, water and their mixtures4.2.4 The fuel is liquid or gas.
4.3 Furnace type selection
4.3.1 If the heated medium meets one of the following conditions, a water-jacket furnace should be selected: a) Natural gas (it is preferred to use a normal pressure water-jacket furnace with a medium velocity in the coil of 15~20m/s for wet gas and 15~30m/s for dry gas). b) Heavy oil.
c) Crude oil with a large sand content.
d) Unstable flow and pressure.
e) Strong corrosiveness.
f) Oil-gas mixture.
g) Working pressure greater than 0.6MPa.
h) Heat load not greater than 1600kW.
4.3.2 If the heated medium meets the following conditions, a fire tube furnace should be selected: a) Medium working pressure p≤0.6MPa.
b) The medium is crude oil, water and its mixture. 5 Process design
5.1 Process calculation of fire tube heating furnace
a) Heat load, pressure level, nominal diameter and model compilation shall comply with the provisions of SY/T0540. b) Thermal and resistance calculation shall comply with the provisions of SY/T0535. 5.2 Heat loss and thermal efficiency (n) of fire tube heating furnace a) Shell heat loss should not be greater than 2%.
b) When the design heat load is less than 630kW: n≥75%. SY/T5262-2000
c) When the design heat load is greater than or equal to 630kW: n280%. 5.3 Excess combustion chamber gas coefficient (α)
The excess combustion chamber gas coefficient () should be selected according to the following values: a) Natural ventilation gas burner: m=1.25. b) Premixed gas burner: α1.2. c) Natural ventilation oil burner: α=1.3, d) Forced ventilation combustion burner: &=1.1～1.2c) Forced ventilation gas burner: α-1.05--1.1.5.4 Heat flux density of simple fire tube heating furnace
5.4.1 Recommended value of average heat flux density of heating surfacea) Fire screen furnace:
1) When the medium is clean water or sewage: 13--29kW/m22) When the medium is crude oil: 11~25kW/m2. h) Water-fired boiler:
The medium is clean water: 11~16kw/m2
5.4.2 Recommended value of maximum average heat flux density of heating surface a) Fire tube furnace should not be greater than 31kW/m2
h) Water jacket boiler should not be greater than 37kW/m2
5.4.3 Heat flux density value of fire tube cross section
a) The value of heat flux density of fire tube cross section is equal to the ratio of the design heat load of fire tube to the product of cross-sectional area of fire tube and thermal efficiency ().
b) When using natural ventilation burners, the heat flux density of the cross section of the fire tube should not be greater than 16800kW/m2. 5.5 Exhaust temperature
The selection of exhaust temperature should meet the following conditions: a) The flue gas temperature at the chimney outlet should not be lower than the flue gas dew point temperature; h) For gas-fired tube heating furnaces, the flue gas temperature at the chimney outlet should meet the following regulations: 1) The gas fuel does not contain sulfur and should not be lower than 120°C when the gas fuel is not moisturized; 2) When the sulfur content of the gas fuel is 0.05% to 1% (volume): The flue gas should not be lower than 150 to 205°C when the flue gas is not moisturized. The flue gas should not be lower than 120-175°C when the flue gas is insulated. 5.6 Furnace insulation
The furnace insulation layer has good thermal insulation performance and ensures that the shell heat dissipation loss should not exceed 2%. 5.7 Design
5.7.1 The flue gas velocity at the smoke outlet can be determined according to the wind speed in the installation area. The recommended values are as follows: a) 5~8m/s for natural ventilation, and not less than 3m/s at the lowest heat load: h) 12-2um/s for forced ventilation, and not less than 5m/s at the lowest heat load: 5.7.2 The required pressure to cut the smoke in the fire-type heating with natural ventilation should be 1.2 times the total resistance of the internal smoke flow. 5.7.3 In addition to meeting the requirements of overcoming the relevant requirements of the smoke flow, the smoke height should also meet the requirements of the three wastes in the country or region. Relevant provisions of emission standards
6 Materials
: Material selection rules
6.1.1 The materials used for the pressure components of the fire-type heating furnace shall comply with the relevant provisions of the standard. All non-pressure components that are in contact with the pressure components shall also be made of materials with good weldabilitySY/F5262-2000
6.1.2 The selection of steel for the fire-type heating furnace must consider the design conditions of the heating furnace (such as design pressure, design temperature, medium characteristics, etc.), the welding performance of the material, the processing technology performance and economic rationality. 6.1.3 The steel for the pressure components of the fire-type heating furnace shall be smelted by open-hearth furnace, electric furnace or oxygen converter. The technical requirements of steel shall comply with the provisions of the corresponding national standards, industry standards or relevant technical conditions. 6.1.4 The shell of the atmospheric pressure water jacket furnace shall not be made of boiling steel plate. 6.1.5 The materials of the fire-type heating furnace used in an acidic environment shall comply with the provisions of SY/T0599. 6.2 Steel plates
6.2.1 Steel plates for pressure components of fire tube heating furnaces shall comply with the provisions of Table 1. Table 1 Steel
Q235-B
Q235-C
15MnVR
GB/T 912GB/T 3274
GE/T912GB/T3274
GB 6654
GB 6654
GB6654
GB 713
GB 713
6.2.2 Steel plates used for pressure components exposed to flame radiation heat and hot flue gas shall comply with the provisions of GB713. 6.2.3 All steel plates that meet the following conditions should be used in the normalized state: Use temperature
a) 20R and 16MnR steel plates with a thickness greater than 50mm for manufacturing pressure components (flanges, flat covers, etc.). b) 15MnVR steel plates with a thickness greater than 16rmm. 6.3 Steel pipes
6.3.1 Steel pipes for pressure components of fire tube heating furnaces shall comply with the provisions of Table 2 Table 2 Steel
GB/T 8163
GB3087
GB/T 8163
GH 3087
GB 5310
GR 6479
GB 6479
GB 6479
Using temperature
SY/T5262-—2000
6.3.2 15MnV steel pipes shall be used in normalized condition. 6.3.3 Steel pipes for pressure components subjected to flame radiation heat and contact with hot flue gas shall comply with the provisions of GB3087. 6.4 Forgings
6.4.1 Forgings for fire tube heating furnaces shall comply with the provisions of Table 3. Table 3 Forging
JB4726
JB4726
JB4726
Using temperature
≤450
6.4.2 The selection of forging grade shall be indicated by the design unit on the drawing or corresponding technical documents. Carbon steel and low alloy steel forgings with a nominal thickness greater than 300mm shall be grade III or grade 6.5 Bolts and nuts
6.5.1 The steel used for bolts of fire tube heating furnace shall comply with the provisions of Table 4. Table 4 Screw
Q235-A
35CrMoA
GB/T700
GB/T699
GB/T3077
GB/T3077
Use temperature
≤300
≤350
≤500
6.5.2 The hardness of the nut should be lower than that of the bolt, which can be obtained by selecting steel of different strength grades or selecting different heat treatment states. The recommended steel for nuts matching the bolts is shown in Table 5. Table 5 Screws
6.6 Welding rods, welding wires and flux
Q235-A
30CrMaA
35CrMoA
GB/T700
GB/T 699
GB/T3077
GB/T3077
Using temperature
≤300
Steel for bolts
Q235-A,35
35CrMoA
The welding rods used for welding pressure components shall comply with the provisions of GB/T983, GB/T5117 and GB/T5118; the welding wires shall comply with the provisions of GB/T14957 and GB/T14958; the flux shall comply with the provisions of GB/T5293. 6
6.7 Refractory materials
SY/T5262—2000
The nozzle bricks and combustion channels of the fire tube heating furnace should be made of clay refractory materials. The performance of clay refractory materials should meet the requirements of YB/T5106, and the refractoriness should not be lower than 1730C: the refractory mud used for masonry of nozzle bricks or combustion channels should meet the requirements of GB/T14982.
7 Strength design
7.1 General provisions
7.1.1 Design pressure of pressure components of fire tube heating furnace a) The design pressure of the shell and fire tube of the fire tube heating furnace should be 1.1 times the working pressure, and should not be lower than the opening pressure of the safety valve. b) The design pressure of the heating coil of the water jacket furnace should be 1.051.10 times the working pressure. 7.1.2 Calculation pressure of pressure components of fire tube heating furnace When the static pressure of liquid column borne by each part or pressure component of the container is greater than or equal to 5% of the design pressure, the calculation pressure shall be the sum of the design pressure and the static pressure of liquid column for the design calculation of the part or component. 7.1.3 Design temperature of pressure components of fire tube heating furnace a) The design temperature of pressure components that are not subjected to flame radiation heat and do not contact hot flue gas shall not be lower than the maximum temperature of the medium in contact with the component.
b) The design temperature of the fire tube is the maximum temperature of the heated medium plus 90℃, and shall not be lower than 250℃. c) The design temperature of the smoke tube is the maximum temperature of the heated medium plus 50℃, and shall not be lower than 250℃. 7.1.4 Design load
The design load shall comply with the provisions of 3.5.4 of GB150-1998. 7.1.5 Thickness addition
The thickness addition shall comply with the provisions of 3.5.5 of GB150-1998. 7.1.6 Design life
Unless there are special requirements, the design life of the fire tube heating furnace is generally considered to be 10 years. 7.1.7 Minimum wall thickness
a) The minimum wall thickness of the shell of the fire tube heating furnace after processing and forming shall meet the following requirements at the same time: 1) When the corrosion allowance is not included, it should not be less than 3mm2) When the wall thickness addition is included, it should not be less than 6mm. b) The effective thickness of the standard elliptical head under internal pressure should not be less than 0.15% of the inner diameter of the head c) The wall thickness of the fire tube after processing and forming (including the thickness addition) should not be less than 6mm. 7.1.8 Welding joint coefficient
a) The welding joint coefficient (Φ) should be determined according to the welding joint type of the pressure component and the length ratio of the non-destructive test. The coefficient of the double-sided welded butt joint and the full penetration butt joint equivalent to the double-sided weld: 100% non-destructive test: Φ=1.00;
Partial non-destructive test: Φ=0.85.
Coefficient of single-sided welded butt joint (with a backing plate close to the base metal along the entire length of the weld root): 100% non-destructive testing: Φ=0.90;
Partial non-destructive testing: Φ-0.80g
b) Coefficient of single-sided welded butt joint without backing plate for atmospheric pressure water jacket furnace shell: Partial non-destructive testing: Φ=0.70;
No non-destructive testing: @=0.60.
7.1.9 Allowable stress of materials
The allowable stress of the materials used in the fire tube heating furnace shall meet the requirements of Table 6, Table 7, Table 8 and Table 9. SY/T 5262—2000
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Welding rods for welding pressure components shall comply with the provisions of GB/T983, GB/T5117, GB/T5118; welding wires shall comply with the provisions of GB/T14957, GB/T14958; flux shall comply with the provisions of GB/T5293. 6
6.7 Refractory materials
SY/T5262—2000
The nozzle bricks and combustion channels of the fire tube heating furnace should be made of clay refractory materials. The performance of clay refractory materials shall comply with the requirements of YB/T5106, and the refractoriness shall not be lower than 1730C: the refractory mud used for masonry of nozzle bricks or combustion channels shall comply with the provisions of GB/T14982.
7 Strength Design
7.1 General Provisions
7.1.1 Design pressure of pressure components of fire tube heating furnace a) The design pressure of the shell and fire tube of fire tube heating furnace shall be 1.1 times of the working pressure, and shall not be lower than the opening pressure of the safety valve. b) The design pressure of the heating coil of the water jacket furnace shall be 1.051.10 times of the working pressure. 7.1.2 Calculation pressure of pressure components of fire tube heating furnace When the static pressure of the liquid column borne by each part of the container or the pressure component is greater than or equal to 5% of the design pressure, the calculation pressure shall be the sum of the design pressure and the static pressure of the liquid column for the design calculation of the part or component. 7.1.3 Design temperature of pressure components of fire tube heating furnace a) The design temperature of pressure components that are not subjected to flame radiation heat and do not contact hot flue gas shall not be lower than the highest temperature of the medium that the component contacts.
b) The design temperature of the fire tube is the highest temperature of the heated medium plus 90℃, and shall not be lower than 250℃. c) The design temperature of the smoke pipe is the maximum temperature of the heated medium plus 50℃, and should not be lower than 250℃. 7.1.4 Design load
The design load shall comply with the provisions of 3.5.4 of GB150-1998. 7.1.5 Thickness addition
The thickness addition shall comply with the provisions of 3.5.5 of GB150-1998. 7.1.6 Design life
Unless there are special requirements, the design life of the fire tube heating furnace is generally considered to be 10 years. 7.1.7 Minimum wall thickness
a) The minimum wall thickness of the shell of the fire tube heating furnace after processing and forming shall meet the following requirements at the same time: 1) When the corrosion allowance is not included, it shall not be less than 3mm2) When the wall thickness addition is included, it shall not be less than 6mm. b) The effective thickness of the standard elliptical head under internal pressure shall not be less than 0.15% of the inner diameter of the head c) The wall thickness of the fire tube after processing and forming (including the thickness addition) shall not be less than 6mm. 7.1.8 Welding joint coefficient
a) The welding joint coefficient (Φ) shall be determined according to the welding joint type of the pressure-bearing component and the length ratio of the non-destructive test. The coefficient of the double-sided welded butt joint and the full penetration butt joint equivalent to the double-sided weld: when 100% non-destructive test: Φ = 1.00;
when local non-destructive test: Φ = 0.85.
The coefficient of the single-sided welded butt joint (with a backing plate close to the base metal along the entire length of the weld root): when 100% non-destructive test: Φ = 0.90;
when local non-destructive test: Φ-0.80g
b) The coefficient of the single-sided welded butt joint without backing plate of the atmospheric pressure water jacket furnace shell: when local non-destructive test: Φ = 0.70;
when no non-destructive test: @ = 0.60.
7.1.9 Allowable stress of materials
The allowable stress of materials used in fire tube heating furnaces shall comply with the requirements of Table 6, Table 7, Table 8 and Table 9. SY/T 5262—2000
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Welding rods for welding pressure components shall comply with the provisions of GB/T983, GB/T5117, GB/T5118; welding wires shall comply with the provisions of GB/T14957, GB/T14958; flux shall comply with the provisions of GB/T5293. 6
6.7 Refractory materials
SY/T5262—2000
The nozzle bricks and combustion channels of the fire tube heating furnace should be made of clay refractory materials. The performance of clay refractory materials shall comply with the requirements of YB/T5106, and the refractoriness shall not be lower than 1730C: the refractory mud used for masonry of nozzle bricks or combustion channels shall comply with the provisions of GB/T14982.
7 Strength Design
7.1 General Provisions
7.1.1 Design pressure of pressure components of fire tube heating furnace a) The design pressure of the shell and fire tube of fire tube heating furnace shall be 1.1 times of the working pressure, and shall not be lower than the opening pressure of the safety valve. b) The design pressure of the heating coil of the water jacket furnace shall be 1.051.10 times of the working pressure. 7.1.2 Calculation pressure of pressure components of fire tube heating furnace When the static pressure of the liquid column borne by each part of the container or the pressure component is greater than or equal to 5% of the design pressure, the calculation pressure shall be the sum of the design pressure and the static pressure of the liquid column for the design calculation of the part or component. 7.1.3 Design temperature of pressure components of fire tube heating furnace a) The design temperature of pressure components that are not subjected to flame radiation heat and do not contact hot flue gas shall not be lower than the highest temperature of the medium that the component contacts.
b) The design temperature of the fire tube is the highest temperature of the heated medium plus 90℃, and shall not be lower than 250℃. c) The design temperature of the smoke pipe is the maximum temperature of the heated medium plus 50℃, and should not be lower than 250℃. 7.1.4 Design load
The design load shall comply with the provisions of 3.5.4 of GB150-1998. 7.1.5 Thickness addition
The thickness addition shall comply with the provisions of 3.5.5 of GB150-1998. 7.1.6 Design life
Unless there are special requirements, the design life of the fire tube heating furnace is generally considered to be 10 years. 7.1.7 Minimum wall thickness
a) The minimum wall thickness of the shell of the fire tube heating furnace after processing and forming shall meet the following requirements at the same time: 1) When the corrosion allowance is not included, it shall not be less than 3mm2) When the wall thickness addition is included, it shall not be less than 6mm. b) The effective thickness of the standard elliptical head under internal pressure shall not be less than 0.15% of the inner diameter of the head c) The wall thickness of the fire tube after processing and forming (including the thickness addition) shall not be less than 6mm. 7.1.8 Welding joint coefficient
a) The welding joint coefficient (Φ) shall be determined according to the welding joint type of the pressure-bearing component and the length ratio of the non-destructive test. The coefficient of the double-sided welded butt joint and the full penetration butt joint equivalent to the double-sided weld: when 100% non-destructive test: Φ = 1.00;
when local non-destructive test: Φ = 0.85.
The coefficient of the single-sided welded butt joint (with a backing plate close to the base metal along the entire length of the weld root): when 100% non-destructive test: Φ = 0.90;
when local non-destructive test: Φ-0.80g
b) The coefficient of the single-sided welded butt joint without backing plate of the atmospheric pressure water jacket furnace shell: when local non-destructive test: Φ = 0.70;
when no non-destructive test: @ = 0.60.
7.1.9 Allowable stress of materials
The allowable stress of materials used in fire tube heating furnaces shall comply with the requirements of Table 6, Table 7, Table 8 and Table 9. SY/T 5262—2000
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