NB/T 47006-2009 English PDF (NB/T47006-2009)

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NB/T 47006-2009: [Renamed from JB/T 4757-2009] 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
铝制板翅式热交换器
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 φ 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 φ=0.95;
Partial nondestructive test φ=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 φ=0.90;
Partial nondestructive test φ=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 ...