Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
NB/T 47004 consists of the following two parts under the general title Plate heat exchangers:
——Part 1: Plate-and-frame heat exchangers;
——Part 2: Welded plate heat exchangers.
This is Part 1 of NB/T 47004.
This part is developed in accordance with the rules given in GB/T 1.1-2009 Directives for standardization - Part 1: Structure and drafting of standards.
This part is modified in relation to ISO 15547-1: 2005 Petroleum, petrochemical and natural gas industries - Plate-type heat exchangers - Part 1: Plate-and-frame heat exchangers.
This part is modified in relation to ISO 15547-1, in consideration of the national conditions of China:
——the foreword and introduction are modified;
——the product scope is modified;
——the terms and definitions are modified;
——some clauses on design, fabrication, inspection and energy efficiency evaluation are added;
——the sequence of some clauses is adjusted;
——Annexes A, B and C are modified;
——the clauses on materials are added.
This part replaces NB/T 47004-2009 (JB/T 4752) Plate heat exchangers, with respect to which, the following main technical changes have been made:
——the application scope of design pressure is given;
——the materials and indexes of some plates and studs are added;
——the strength calculation of clamping stud is added;
——the deviation indexes of thickness thinning, chevron depth and gasket groove depth are increased;
——the energy efficiency evaluation method is added;
——the requirements for determination of compression set of gaskets are added;
——the fabrication deviation requirements for gasket thickness are adjusted.
In this part, Annex A is normative while Annexes B and C and informative.
This part was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
This part is drafted by Subcommittee on Heat Exchangers of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262/SC 5).
The previous edition of this part is as follows:
——NB/T 47004-2009 (JB/T 4752).
Introduction
NB/T 47004 concerning plate heat exchangers was prepared by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (hereinafter referred to as the "Committee"), for the purpose of standardizing the technical requirements related to the design, fabrication, inspection and performance determination of plate heat exchangers built or used in China.
The technical clauses of this part include technical requirements to be followed by the plate-and-frame heat exchangers during the design, fabrication, inspection, acceptance, energy efficiency evaluation, installation and use. It is unnecessary and impossible for this part to cover all the technical details for plate-and-frame heat exchangers, so under the premise of satisfying the basic safety requirements, the technical contents not specially mentioned in this part shall not be banned. This part can neither serve as the technical manual on fabricating plate heat exchangers, nor replace training, engineering experience and engineering evaluation.
This standard does not restrict the use of advanced techniques in practical engineering design and fabrication, as long as the engineering technicians can make reliable judgment and ensure the compliance with this part.
The issuing body of this document shall draw attention to that where compliance with this part is declared, the use of patent related to 10.1 “energy efficiency value” and “a quantitative evaluation method of energy efficiency for heat exchanger” may be involved.
The issuing body of this document does not propose any perspective for the authenticity, effectiveness and scope of this patent.
The patent holders have already assured the issuing body of this document that they would like to negotiate with any applicant about the patent authorization license under reasonable and nondiscriminatory terms and conditions. The patent holders’ statements have been put on records at the issuing body of this document. Their relevant information may be obtained through the following contact information:
Names of patent holders: Zhang Yanfeng (Lanzhou Guanyu Heat Transfer and Energy Saving Engineering Technology Research Co., Ltd.), Bai Bofeng (Xi'an Jiaotong University), Zhou Wenxue, Jiang Chen and Shou binan.
Address: No.8, Lanke Road, Anning District, Lanzhou City, Gansu Province.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard neither requires nor forbids the designers using computer program to realize the analysis or design of plate heat exchangers; however, when computer program is used in analysis or design, the following ones shall be confirmed in addition to that the requirements of this part shall be met:
a) the rationality of the technology assumption in the adopted program;
b) the adaptability of the adopted program to the design content;
c) the correctness of the input parameter and output result of the adopted program for engineering design.
Inquiries about the technical clauses of this standard shall be submitted to the Secretariat of the Committee in written form, and it is obliged to provide those possibly required information. All the inquiries which are not related to standard clauses directly or cannot be understood will be deemed as technological consultation. As a result, the Committee is entitled to refuse them.
For the comprehension ambiguities and the resulting consequences caused by the publicizing or interpretation of this standard by other organizations without written entitlement or approval of the Committee, the Committee will not undertake any responsibility.
Plate heat exchangers - Part 1: Plate-and-frame heat exchangers
1 Scope
1.1 This part specifies the requirements for material, design, fabrication, inspection, performance determination and energy efficiency evaluation of plate-and-frame heat exchangers (hereinafter referred to as plate heat exchangers).
1.2 This part is applicable to gasketed or semi-welded plate-and-frame heat exchangers. Other plate heat exchangers, where designed, fabricated and inspected by reference to this standard, shall be approved and agreed by the purchaser.
1.3 Design pressure applicable to this part:
a) the design pressure of gasketed plate heat exchanger is not greater than 3.0MPa;
b) the design pressure of semi-welded plate heat exchanger is not greater than 6.0MPa.
1.4 The design temperature range applicable to this part shall be determined according to the allowable service temperature of materials of gaskets and other elements.
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 normative document (including any amendments) applies.
GB/T 150.2-2011 Pressure vessels - Part 2: Materials
GB/T 699 Quality carbon structure steel
GB/T 700 Carbon structural steels (ISO 630: 1995, NEQ)
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 1220 Stainless steel bar
GB/T 1591 High strength low alloy structural steels
GB/T 2054 Nickel and nickel alloy plate and sheet
GB/T 3077 Alloy structure steels
GB/T 3274 Hot-rolled plates and strips of carbon structural steels and high strength low alloy structural steels (ISO 13976: 2005, ISO 630: 1995, NEQ)
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 3621 Titanium and titanium alloy plate and sheet
GB/T 3624 Titanium and titanium alloy tubes
GB/T 3625 Titanium and titanium alloy tube for condensers and heat exchangers
GB/T 4156 Metallic materials - Sheet and strip - Erichsen cupping test (ISO 20482: 2003, IDT)
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 8163 Seamless steel tubes for liquid service
GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB/T 14845 Titanium sheet for plate heat exchangers
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB/T 26299 Copper alloy sheet and strip for anti-corrosion
GB/T 27698.1 Test method for the performance of heat exchangers and heat exchange element - Part 1:General requirements
GB/T 27698.3 Test method for the performance of heat exchangers and heat exchange element - Part 3: Plate heat exchanger
NB/T 47008 Carbon steel and alloy steel forgings for pressure equipments
NB/T 47009 Alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments
NB/T 47013 (All parts) Nondestructive testing of pressure equipments
NB/T 47014 Welding procedure qualification for pressure equipment
NB/T 47018 Technical permission of welding materials for pressure equipment
YB/T 5354 Cold-rolled plates of corrosion-resisting alloys
3 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
3.1
plate
corrugated plate formed by precise pressing
3.2
heat transfer area per plate
the surface area of single side of a plate (the shaded part in Figure 1) involved in heat transfer, which is calculated using Equation (1):
a=φ·a1 (1)
Where,
a——the heat transfer area per plate, m2;
a1——the projected area of a plate involved in heat transfer, m2;
Figure 1
φ——the corrugation expansion coefficient, calculated using Equation (2):
(2)
Where,
t'——the surface length of the corrugated pitch (as shown in Figure 2), mm;
t——the corrugated pitch (as shown in Figure 2), mm.
Note: when the difference between the corrugated pitch in diversion zone and that in corrugated zone is large, the heat transfer area of the diversion zone and the corrugated zone shall be calculated respectively, and then added together.
Figure 2
3.3
the nominal heat transfer area per plate
rounded heat transfer area per plate
3.4
connector plate
plate that divides a plate heat exchanger into two or more heat transfer sections
3.5
end plates
plate which prevents the fluids from contacting the connector plate or cover plate
3.6
heat transfer area
rounded sum of heat transfer area per plate of all plates of a plate heat exchanger, which are in contact with medium on both sides
3.7
frame
assembly that provides the structural support and pressure sealing of a plate heat exchanger
3.8
pass plate
plate used to change the direction of medium flow in a plate heat exchanger with two or more passes
3.9
pass
a group of channels in which the medium flows in the same direction in a plate heat exchanger
3.10
channel
medium flow channel formed by adjacent plates in a plate heat exchanger
3.11
pass and channel arrangement
pass and channel arrangement in plate heat exchanger, expressed as:
(3)
Where,
M1, M2, ..., Mi——the number of passes having the same number of channels on heat medium side from the fixed cover plate;
N1, N2, ..., Ni—— the number of channels corresponding to M1, M2, ..., Mi passes;
m1, m2, ..., mi—— the number of passes having the same number of channels on cold medium side from the fixed cover plate;
n1, n2, ..., ni——the number of channels corresponding to m1, m2, ..., mi passes.
3.12
equivalent diameter
ratio of 4 times of sectional area of channels between plates to the wet perimeter
3.13
normal channel space
average distance between the channels of plate heat exchanger
3.14
plate gap
average distance b between two adjacent plates of plate heat exchanger, as shown in Figure 2
3.15
chevron depth
plate chevron forming depth h, as shown in Figure 2
3.16
plate chevron angle
angle β formed between the plate chevron and the horizontal, as shown in Figure 1
3.17
plate thickness
standard specification thickness S0 of the plate marked in the drawing
3.18
plate thickness thinning
difference between the actual plate thickness and the thickness at maximum thinning place of formed plate
3.19
port
inlet or outlet opening in the plate
3.20
plate pack
grouping of all plates contained within a frame
3.21
semi-welded plate pair
two plates welded together
3.22
plate heat exchanger
heat exchanger consisting of plate (or semi-welded plate pair), sealing gasket and support frame. Figure 3 shows the composition of a typical plate heat exchanger
Figure 3
3.23
pressure
force acting on unit area vertically. For the purpose of this part, unless otherwise specified, pressure refers to gauge pressure
3.24
operating pressure
maximum pressure possibly existing on any side of plate heat exchanger under normal operating condition
3.25
design pressure
maximum pressure set on any side of plate heat exchanger, which is used as design load conditions together with the corresponding design temperature and shall not be less than the operating pressure
3.26
design temperature
element temperature of plate heat exchanger set under normal operating pressure and corresponding design pressure
3.27
energy efficiency index (EEI) of plate heat exchanger
calculated energy efficiency of plate heat exchanger under the test conditions specified in this standard
3.28
the minimum allowable values of energy efficiency of plate heat exchanger
the minimum allowable energy efficiency of plate heat exchanger under the test conditions specified in this standard
4 General requirements
4.1 General
The design, fabrication, inspection, performance determination and energy efficiency evaluation of plate heat exchanger shall meet the requirements of this part, the relevant national laws and regulations and safety technical codes as well as the relevant standards, codes and regulations agreed or designated by the purchaser; besides, it shall also meet the requirements of drawings.
4.2 Qualification
4.2.1 The design organization and fabrication organization of plate heat exchanger shall establish and improve various management systems.
4.2.2 The fabrication organization of plate heat exchanger and its sealing gasket shall have the basic conditions for the production of plate heat exchanger and sealing gasket, and should obtain the corresponding safety registration certificate and energy saving registration certificate of plate heat exchanger.
4.3 General requirements
4.3.1 Expression for model of plate heat exchanger
Example 1: the plate heat exchanger with M-shaped plate, port diameter of 200mm, design pressure of 1.6MPa and design temperature of 100℃ is expressed as: M20-1.6/100.
Example 2: the plate heat exchanger with V-shaped plate, nominal heat transfer area per plate of 1.3m2, design pressure of 1.0MPa and design temperature of 120℃ is expressed as: V13-1.0/120.
4.3.2 The purchaser should confirm the requirements of various clauses in Annex B.
4.3.3 The supplier and the purchaser should jointly complete the requirements of various clauses in Annex C.
4.4 Allowable stress of stud
The safety factor of steel stud is selected according to Table 1.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Materials
6 Design
7 Drawings and quality certificates
8 Fabrication
9 Inspection and performance determination
10 Energy efficiency evaluation
11 Marking, transportation, packaging and storage
Annex A (Normative) Plate heat exchanger gasket
Annex B (Informative) Plate heat exchanger checklist
Annex C (Informative) Plate heat exchanger data sheets
