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NB/T 47006-2009 English PDF (NBT47006-2009)

NB/T 47006-2009 English PDF (NBT47006-2009)

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NB/T 47006-2009: [Renamed from JB/T 4757-2009] Aluminum plate-fin heat exchanger

This standard specifies the requirements of design, manufacture, inspection acceptance, installations, application and maintenance of Aluminum plate-fin heat exchanger.
NB/T 47006-2009 (Renamed from JB/T 4757-2009)
INDUSTRY STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 27.060.30
J 75
NB/T 47006-2009
Replacing JB/T 7261-1994
Aluminum Plate-fin Heat Exchanger
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ISSUED ON: MARCH DECEMBER 01, 2009
IMPLEMENTED ON: MAY 01, 2010
Issued by: National Energy Board of the People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 General Provisions ... 8
4 Materials ... 18
5 Design ... 18
6 Fabrication, Inspection and Acceptance ... 36
7 Installation and Operation ... 50
Annex A (Normative) Test Methods of Heat Exchanger Performance ... 60
Annex B (Informative) Welded Joint Type ... 74
Annex C (Informative) Preparation Method of Heat Exchanger Type ... 81
Annex D (Informative) Application Instruction of Heat Exchanger ... 83
Aluminum plate-fin heat exchanger
1 Scope
This standard specifies the requirements of design, manufacture, inspection acceptance, installations, application and maintenance of Aluminum plate-fin heat exchanger (hereinafter referred to as heat exchange).
1.1 This standard is applicable to the heat exchanger with design pressure no greater than 8.0MPa. For the heat exchanger with design pressure greater than 8.0MPa, it may be designed and manufactured with reference to this standard when the buyer is agreed upon.
1.2 The design temperature range suitable to this standard is -269??C~200??C. 1.3 This standard is applicable to the heat exchangers applied in the situation of air separation and liquification equipment (ASU), natural gas processing (NGP) and liquification (LNG), petrochemical engineering and mechanical power devices. 1.4 The pressure parts of heat exchanger which couldn't be determined by this standard, through the assessment and ratification of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China, may be designed by adopting the following methods:
a) The stress analysis (except the unit qualified for analysis design) including finite element method;
b) Replication experimental analysis (such as experimental stress analysis and replication hydraulic test);
c) The comparable structure which has been put into service shall be adopted to carry out the comparison empirical design.
2 Normative References
The following documents are indispensable to the application of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies.
GB 150 Steel Pressure Vessels
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, ISO 6892: 1998(E), EQV)
GB/T 229 Metallic materials - Charpy Pendulum Impact Test Method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 232 Metallic Materials - Bend Test (GB/T 232-1999, ISO 7438: 1985, EQV) GB/T 1804 General tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (GB/T 1804-2000, ISO 2768-1: 1989, EQV) GB/T 2624.1-2006 Measurement of Fluid Flow by Means of Pressure Differential Devices Inserted in Circular Cross-section Conduits Running Full - Part 1: General Principles and Requirements (GB/T 2624.1-2006, ISO 5167-1: 2003, IDT)
GB/T 2624.2-2006 Measurement of Fluid Flow by Means of Pressure Differential Devices Inserted in Circular Cross-section Conduits Running Full - Part 2: Orifice Plates(GB/T 2624.2-2006, ISO 5167-2: 2003, IDT)
GB/T 2624.3-2006 Measurement of Fluid Flow by Means of Pressure Differential Devices Inserted in Circular Cross-section Conduits Running Full -Part 3: Nozzles and Venturi nozzles (GB/T 2624.3-2006, ISO 5167-3: 2003, IDT)
GB/T 2624.4-2006 Measurement of Fluid Flow by Means of Pressure Differential Devices Inserted in Circular Cross-section Conduits Running Full - Part 4: Venturi Tubes (GB/T 2624.4-2006, ISO 5167-4: 2003, IDT)
GB/T 3190 Wrought Aluminum and Aluminum Alloys - Chemical Composition Limits (GB/T 3190-2008, ISO 209: 2007(E), MOD)
GB/T 3191-1998 Extrusion Rods and Bars of Aluminum and Aluminum Alloy
GB/T 3195-2008 Aluminum and Aluminum Alloys Drawn Round Wire
Aluminum and Aluminum-alloy Foil
GB/T 3246.1 Wrought Aluminum and Aluminum Alloys Products Inspection Method for Structure
GB/T 3246.2 Wrought Aluminum and Aluminum Alloys Products Inspection Method for Macrostructure
GB/T 3880.1-2006 Wrought Aluminum and Aluminum Alloy Plates, Sheets and Strips for General Engineering - Part 1: Technical Conditions of Delivery
GB/T 3880.2-2006 Wrought Aluminum and Aluminum Alloy Plates, Sheets and Strips for General Engineering - Part 2: Mechanical Properties
GB/T 3880.3-2006 Wrought Aluminum and Aluminum Alloy Plates, Sheets and Strips for General Engineering - Part 3: Tolerances on Forms and Dimensions
GB/T 4436 Wrought Aluminum and Aluminum Alloy Tubes - Dimensions and
Deviations
GB/T 4437.1-2006 Aluminum and Aluminum Alloy Extruded Tubes - Part 1: Seamless Tubes
GB/T 6892-2006 Wrought Aluminum and Aluminum Alloys Extruded Profiles for General Engineering
GB/T 6893-2000 Aluminum and Aluminum Alloy Cold Drawn (rolled) Seamless Tubes GB/T 8063-1994 Designation of Cast Nonferrous Metals and Their Alloys (GB/T 8063-1994, ISO 2092, NEQ)
GB/T 9438-1999 Aluminum Alloy Casting (GB/T 9438-1999, ASTM B26/B26M:1992, NEQ)
GB/T 10858-2008 Aluminum and Aluminum Alloy Wires and Rods
GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product GB/T 16474 Wrought Aluminum and Aluminum Alloy-Designation System (GB/T 16474-1996, ANSI H35.1:1993, EQV)
GB/T 16475 Temper Designation System for Wrought Aluminum and Aluminum Alloy (GB/T 16475-2008, ISO 2107:2007, MOD)
JB/T 4730.2-2005 Nondestructive Testing of Pressure Equipment - Part 2: Radiographic Testing
JB/T 4730.3-2005 Nondestructive Testing of Pressure Equipment - Part 3: Ultrasonic Testing
JB/T 4730.5-2005 Nondestructive Testing of Pressure Equipment - Part 5: Penetrant Testing
JB/T 4734 Aluminum Welded Vessels
3.3.3 Heat transfer fin
It is the primary part of heat exchanger and the heat transfer process is mainly finished through the heat conduction of heat transfer fin as well as the convection heat transfer between the heat transfer fin and fluid.
3.3.4 Distributor fin
It shoulders mail the steering function for the fluid inlet and outlet, and it is generally multi-orifice heat transfer fin.
3.3.5 Side bar
It is the primary part of heat exchanger, which are dispersed over the margins of heat exchanger and acts to seal and support each layer of passage.
3.3.6 Parting sheet
It is the metal sheet between two layers of heat transfer fins, also called composite sheet; it covers a layer of brazing alloy on the surface of parent metal and when it is brazed, the alloy is melted and the heat transfer fin, side bar and sheet are welded together.
3.3.7 Cap sheet
It is the parting sheet located at the outermost side of the heat exchanger block (core), also called cover plate.
3.3.8 Dummy layer
It is the layer which is set on the top and bottom of the block (core) to connect with the ambient atmosphere for heat exchange resistance according to the requirements of strength, heat isolation and manufacture process. (And it is called the process layer). 3.3.9 Dead area
It refers to the area where the heat transfer fin or distributor fins are connected or unconnected without media flowing.
3.3.10 Layer arrangement
The layer arrangement manners may be classified into single banking, double banking and single and multiple banking.
3.4.1.6 When the heat exchanger is operated in vacuum state, the design pressure of vacuum layer shall be considered according to the bore external pressure and when the safety control device is installed, the design pressure is taken with the minimum value of 1.25 times of the maximum internal and external pressure difference and the 0.1MPa; when no safety control device is installed, it shall be taken as 0.1MPa. 3.4.2 Design temperature
3.4.2.1 The increase of internal thermal stress shall not exceed the ultimate strength of material and the maximum recommended allowable temperature difference is 50??C between the aluminum heat exchanger layers (on the same section) in the steady state; However, for the fluid with phase change and instant circulation, the recommended temperature difference shall be 20??C~30??C.
3.4.2.2 When the design temperature is not greater than 65??C, the aluminum alloy with magnesium content of more than 3% shall not be adopted.
3.4.2.3 The design temperature shall not be less than the maximum temperature attained by the parts metals under operating conditions. For the metal Temperature of below 0??C, the design temperature shall be -269??C at the lowest.
3.4.2.4 When the metal temperatures of heat exchanger parts are different under operating conditions, the maximum temperature shall be complied with to design. In any case, the metal surface temperature of parts shall not exceed the allowable service temperature of material.
3.4.2.5 The metal temperature of parts may be attained by heat transmission calculation or measured on the heat exchanger in the same applied working condition or determined according to the medium temperature. For the heat exchanger in different working condition, it shall be designed according to the harsh working conditions group; the pressure and temperature values in the working conditions shall be indicated in the drawing or corresponding technical provisions.
3.4.3 Fluid medium
The media characteristics used in the operational process shall be restricted. The fluid shall be clean and free of corrosive action to the aluminum alloy; generally the corrosion allowance is not taken into consideration. The media which can easily be scale formed, settled and block the heat exchanger shall be controlled. 3.4.4 Load
The following loads shall be taken into consideration in design:
determined according to those specified in JB/T 4734 or according to the mechanical property and safety factor as provided by the corresponding standards; for the materials of pressure parts, such as heat transfer fin and parting sheet, it shall be determined by dividing the tensile strength value as specified in GB/T 3198 and YS/T 69 by the safety factor 4~6.
3.6 Welded joint factor
The welded joint factor ?? shall be determined according to the welding method and welded joint mode of pressure parts as well as the linear scale of nondestructive test: a) For the butt joint of both sides welding and the full penetration butt joint equivalent to the both sides welding:
The 100% nondestructive test ??=0.95;
Partial nondestructive test ??=0.8.
b) The joint of single welded butt joint (stool plate is closely clung to the base metal along the seam root full length):
100 % nondestructive test ??=0.90;
Partial nondestructive test ??=0.8.
When the welded joint couldn't be carried out with nondestructive test due to structure, full penetration structure shall be adopted for the welded joint and the welded joint coefficient is generally not greater than 0.6.
3.7 Pressure test
Pressure test shall be carried out after the heat exchanger is manufactured. The manner, requirements and test pressure of pressure test shall be indicated in the drawing.
The pressure test is generally adopted with hydraulic test and the testing liquid shall be carried out according to those specified in 6.2.
For the heat exchanger which is not allowed to have residual liquid or the hydraulic test couldn't be carried out with full liquid due to structure may be adopted with the pneumatic test. The heat exchanger to carry out pneumatic test and leakage test shall be in accordance with those specified in 6.2.
3.7.1 Test pressure
Where:
pT -- The test pressure, MPa;
p -- The design pressure, MPa;
3.7.1.3 The pressure test with special requirements
For the heat exchanger which bears alternate load or is applied in special situations, the hydraulic test pressure shall be suitably raised and the specific requirements shall be carried out according to those specified in the drawing.
3.8 Drawing
The outside drawing of product provided by the manufactory shall be equipped with all the data that is required for the buyer examination and mainly includes: a) Physical dimension, material thickness, model specification, heat interchanging area, layer volume, support and weight;
b) The designation specification of material and the heat transfer fin type of applied heat transfer fin;
c) Position of nozzle and flange, connection details and types of all fluids if necessary;
d) Manufacturing and testing data, range and position of nondestructive test, test pressure and welding seam identification.
4 Materials
The materials for heat exchanger shall be taken into consideration with the operating conditions (such as design temperature, design pressure, media characteristics and operating feature), manufacture process and inspection requirements of heat exchanger as well as the economical rationality; it shall also be provided with favorable corrosion resisting property, mechanical property, welding property, shaping property and other processing properties and physical properties. For the specified, the relevant requirements as specified in JB/T 4734, GB/T 3198 and YS/T 69 shall be taken as the reference.
5 Design
Fx -- the component force on the interior section of x direction from nozzle to header, N;
Fy -- the component force on the interior section of Y direction from nozzle to header, N;
Fz -- the component force on the interior section of Z axis direction from nozzle to header, N;
h1, h2 -- the folding height of slab composite header, mm;
h -- the height of transitional short piece, mm;
H -- the height of slab composite header, mm;
L -- the longitudinal width of rectangular bottom surface for the composite header, mm;
M -- the calculated resultant moment on the interior section from nozzle to header, N???m;
Mr -- the allowable resultant moment on the interior section from nozzle to header, N???m;
Mx -- the component moment on the interior section of x direction from nozzle to header, N???m;
My -- the component moment on the interior section of Y axis direction from the nozzle to header, N???m;
Mz -- the component moment on the interior section of Z axis direction from nozzle to header, N???m;
p -- the design pressure, MPa;
Ri -- the internal radius of header body, mm;
Rp -- the calculation radius of slab-shaped header with ends, mm;
??p -- the thickness of slab-shaped header with ends ( including additional value of wall thickness ), mm;
?? -- the slope angle of oblique slab-shaped header with ends, 45 ????? ?????90??; 5.1.8 Wall thickness calculation and strength check
5.1.8.1 Wall thickness calculation of curve header with ends and header body (Figure 5.3):
When di /Di ???0.5, the calculation shall be calculated according to Formula (5.1): ??? ??? Cp
pR
i ?€??€??€? 6.0????????? (5.1)
Therein ??=0.6.
5.1.8.2 The wall thickness of header body of the header as shown in Figure 5.4~Figure 5.6 shall be calculated according to Formula (5.1). For the certain design wall thickness ?? of the header shown in Figure 5.7, each design size shall be carried out with the stress check before pressure test unless that effective stress analysis has been made or the experienced formulae is adopted.
The circular cylinder stress shall be checked according to Formula (5.2) before the pressure test:
eiT
Rp
?????? )5.0( ?€??€? (5.2)
Where:
??T -- the circular cylinder stress under test pressure, MPa;
Ri -- the interior diameter and radius of circular cylinder, mm;
pT -- the test pressure, MPa;
??e -- the effective thickness of circular cylinder, mm.
??T shall meet the following conditions:
In hydraulic test:
??T???0.9??R0.2
In pneumatic test:
??T???0.8??R0.2
b) If a certain flow velocity is required to maintain and the nozzle diameter is restricted, several nozzles may be welded on the same header;
c) To prevent or reduce the erosion to the aluminum members on the heat exchanger inlet and outlet, the flow velocity limit shall be taken into consideration;
d) When the external nozzle diameter of heat exchanger is less than 40 mm, the structure form of processing the rod into socket welding nozzle. For the tangential nozzle, the flow area between nozzle and header shall not be less than the sectional areas of nozzle.
5.8.2 Nozzle installation
When the nozzle is installed, the fluid in the pressure ports shall be discharged completely. If necessary, discharge joint shall be additionally installed on the header or connecting pipe to install outlet- check valve.
5.8.3 Nozzle load
When the nozzle of heat exchanger is added with force and force moment by the connecting pipe, the maximum force and force moment of such parts as nozzle and header shall be checked by the manufactory.
The total resultant force F and the resultant moment M shall be calculated and determined according to Formula (5.5)~(5.7).
222
zyx MMMM ?€??€??€? (5.5)
222
zyx FFFF ?€??€??€? (5.6)
And:
(M/Mr)+(F/Fr)???l (5.7)
See Figure 5.17 for the three coordinate axes positions.
d) When assembling, each seriate braze welding component shall be drawn aside with each other, but not wrap. When the design pressure p???2.5MPa, the
splicing gap of the braze welding cellular shall not be larger than 1.5mm, and the part shall not be larger than 3mm, and when the design pressure
p>2.5MPa, the splicing gap of the braze welding cellular shall not be larger than 1mm, and the part shall not be larger than 2mm. The special
requirements of splicing gap shall be noticed in the pattern.
6.1.3.2 Joint brazing procedure
The establishment of the joint brazing procedure shall be carried out according to the qualified evaluation of the joint brazing procedure.
6.1.3.3 Appearance of the block
a) The welded joint of the block shall be satiation and smooth, the phenomenon which the spelter blocked the channel shall be avoided.
b) The wing shape of the distributor fin shall be regular, and shall not come out of the parting sheet.
c) The cove of the side bar between two adjacent floors which outer flip quantity shall not excess 2mm;
d) The dislocation quantity of the upper and lower plane of the block shall be no larger than 1.5mm of each 100mm, and the total dislocation quantity shall be no larger than 8mm.
e) The total amount of the inferior fovea pleural shall not excess 1% of the block lamination gross thickness.
6.1.4 Welding
6.1.4.1 Type of welded joint
The welded joint type shall be chosen according to the medium temperature and loading conditions, when choosing the welded joint type, the generation of oversized stress concentration and obvious profile revulsion shall be avoided, the alternative welded joint type is provided in annex B.
6.1.4.2 Welding process
a) The welding procedure qualification before the construction of heat exchanger shall be carried out according to the JB/T 4734 in annex. The welding process 6.1.7.4 The welded joint of nozzle and flange, if any one of the two needs to adopt the heat treatment to improve the mechanical strength of materials, penetrant testing shall be carried out according to JB/T 4730.5, and ...

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