HG 2370-1992 Technical requirements for graphite chemical equipment HG2370-1992 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG2370-92
Technical Conditions for Chemical Equipment Made of Graphite
Published on September 15, 1992
Ministry of Chemical Industry of the People's Republic of China
Implementation on July 1, 1993
Chemical Industry Standard of the People's Republic of China
Technical Conditions for Chemical Equipment Made of Graphite
Subject Content and Scope of Application
HG2370-92
This standard specifies the technical requirements, test methods, inspection rules and requirements for marking, packaging and transportation of chemical equipment made of graphite. This standard is mainly applicable to chemical equipment and parts made of impermeable graphite. Chemical equipment made of permeable graphite can also be used as a reference. 2 Reference standards
GB150 Steel pressure vessels;
GB1431 Determination of compressive strength of carbon materials GB1804 Limit deviation of dimensions without tolerance GB3074.1 Determination of flexural strength of graphite electrodes
GB3074.4 Determination of coefficient of thermal expansion (CTE) of graphite electrodes GB6154 Determination of bulk density of carbon materials GB6155, Determination of true density of carbon materials GB8721 Determination of tensile strength of carbon materials GB/T13465.1 General test methods for mechanical properties of impermeable graphite materials GB/T13465.2 Test methods for flexural strength of impermeable graphite materials GB/T13465.3 Determination of compressive strength of impermeable graphite materials Strength test method HG5-1329 Test method for tensile strength of impermeable graphite material HG/T2059
Technical conditions for impermeable graphite pipes and fittings
HG/T2060·Test method for weight gain rate of impregnated graphite HG/T2378
HG/T2379
HG/T2380
Test method for tensile strength of graphite adhesives Test method for shear strength of graphite adhesives Test method for shrinkage of graphite phenolic adhesives Technical conditions for steel welded atmospheric pressure vessels
JB2880
3 Technical requirements
3.1 Materials
3.1.1 Graphite block
Graphite block should have no cracks on the surface and the material should be uniform. The physical and mechanical properties of unimpregnated graphite and impregnated graphite blocks shall conform to the requirements of Table 1.
Approved by the Ministry of Chemical Industry of the People's Republic of China on September 15, 1992 and implemented on July 1, 1993
True density
Volume density
Compressive strength
Tensile strength
Flexural strength
Thermal conductivity
Linear expansion coefficient||t t||Allowable temperature
HG2370-92
Graphite and impregnated graphite block physical and mechanical properties
W/(m·K)
Note: The numbers with parentheses are reference values
3.1.2 Adhesive
Unimpregnated graphite block
>2.18×103
>1.52x102
(2. 20~2. 90)× 10~6
(130℃)
The physical and mechanical properties of graphite phenolic adhesive shall meet the requirements of Table 2. Table 2 Physical and mechanical properties of graphite phenolic adhesive Item
Tensile strength of castings
Compressive strength of castings
Bond shear strength
Bond tensile strength
Linear shrinkage of thermal curing
Thermal conductivity
Linear expansion coefficient
Note: The numbers with () are reference numbers
3.1.3 Steel and cast iron
w/ (m·K)Www.bzxZ.net
Phenolic resin without graphite
>2.03×103
≥1.80×103
(105~128)
(5.10~5.70) × 10~6
(21~23)
(2.50~2.70)× 10-5
(130℃)
(130℃)
The steel shell material and pressure-bearing cast iron parts of graphite equipment shall comply with the provisions of GB150 for pressure vessels and JB2880 for atmospheric pressure vessels.
3.2 Graphite parts
3.2.1 Impregnated graphite parts
3.2.1.1 Before impregnation, the surface dust and oil of graphite parts shall be cleaned and dried, and solidification shall be carried out after impregnation. 3.2.1.2 The curing temperature after impregnation shall be 130~170℃, and shall not be lower than the design temperature. The weight gain rate of impregnated graphite block shall not be less than 14%. 3.2.1.3
3.2.2 Graphite parts splicing
HG2370-92
3.2.2.1 The bonding surface shall be free of dust, oil and residual resin, and the bonding surface shall usually be treated to a rough surface. 3.2.2.2 The bonding seam should be dense and full, with a width of no more than 1mm. 3.2.2.3 For main components (head, tube sheet, heat exchange block, cylinder, etc.), single-layer splicing should be stepped or grooved, as shown in a or b in Figure 1; for multi-layer splicing, the seams should be staggered and not overlapped. At this time, the seams in each single layer can be butt-jointed, as shown in c in Figure 1. a Stepped
b Groove type
Figure 1 Graphite parts splicing type
Multi-layer splicing
3.2.3 Graphite parts should not have defects that affect mechanical properties, such as cracks, bubbles, delamination, and falling pieces. The appearance of the equipment should be smooth, regular and clean, and the sealing surface should not have defects that affect the sealing performance. 3.2.4 The maximum allowable value of the surface roughness Ra of each component is 12.5μm, and the maximum allowable value of the sealing surface Ra is 6.3um. 3.2.5 The tolerance grade of graphite machined parts without tolerance grade is selected according to GB1804. The machined parts shall not be less than IT14, and the non-machined parts and installation dimensions shall not be less than IT15.
3.3 Equipment
3.3.1 The manufacturing of steel parts of graphite equipment shall comply with the requirements of the drawings. For pressure elements, The components shall also comply with the provisions of GB150 and the "Regulations on Safety Technical Supervision of Pressure Vessels". If they are normal pressure components, they shall comply with the relevant provisions of JB2880. 3.3.2 When adhesives are used during the assembly of equipment, the bonding seams shall comply with the provisions of Article 3.2:2. After assembly, the equipment shall be cured in accordance with the provisions of Article 3.2.1.
3.3.3 Assembly requirements
When installing graphite components and pipes, forced installation is not allowed. Graphite is a brittle material and severe vibration or impact shall be prevented during installation and use.
3.3.4 After the equipment is assembled, it is necessary to conduct a water pressure test on the whole machine. All bonding and sealing parts of the components must not leak. After the water pressure test of the equipment is completed, the water in the equipment should be drained. 4 Test method
4.1 Sampling of graphite materials
Sampling of unimpregnated graphite materials shall be carried out in accordance with GB/T13465.1. 4.2 Physical and mechanical tests of unimpregnated graphite materials
4.2.1 Linear expansion coefficient of graphite materials shall be carried out in accordance with GB3074.4. 4.2.2 Bulk density and true density of graphite materials shall be carried out in accordance with GB6154 and GB6155. 4.2.3 The tensile strength, compressive strength and flexural strength of graphite materials are tested according to GB8721, GB1431 and GB3074.1 respectively.
4.3 Physical and mechanical test of impregnated graphite materials
The tensile strength, compressive strength and flexural strength of impermeable graphite materials are tested according to HG5-1329, GB/T13465.3 and GB/T13465.2 respectively.
4.4 Physical and mechanical test of graphite adhesive
4.4.1 The shrinkage rate of graphite phenolic adhesive is tested according to HG/T2380. 4.4.2 The tensile strength and shear strength of the stone adhesive shall be tested according to the methods of HG/T2378 and HG/T2379 respectively. 4.5 Equipment pressure test
HG2370-92
4.5.1 The accuracy of the pressure gauge used in the test shall not be less than Class 1.5. The limit value of the pressure gauge dial scale shall be 1.5~2 times the maximum test pressure.
4.5.2 The test pressure shall be 1.25 times the design pressure and shall not be less than the design pressure plus 3×10\MP a, the holding time shall not be less than 30min.
4.6 The geometric dimensions of the equipment shall be measured with steel measuring tools. 5 Inspection rules
5.1 Raw material inspection
5.1.1 Graphite blocks are inspected in batches of 20t. If the batch is less than 20t, it shall be inspected in batches according to the factory batch. 5.1.2 Phenolic resin used for impregnated graphite and graphite phenolic adhesive shall be inspected in batches according to the factory batch. 6.1.3 The raw material inspection of impermeable graphite tube shall be carried out in accordance with the provisions of HG/T2059. 5.1.4 The mandatory inspection items of raw materials shall be carried out according to Table 3, and the mandatory inspection items must meet the requirements. Table 3 Mandatory inspection items of raw materials
Raw materials
Unimpregnated graphite blocks
Impregnated graphite blocks
Impermeable graphite tubes
Adhesives
5.2 Inspection of parts
Tensile strength
Compressive strength
5.2.1 Inspection of parts shall be carried out piece by piece according to the requirements of the drawings. 5.2.2 The appearance and geometric dimensions of the parts shall comply with the requirements of the drawings. 5.3 Factory inspection of equipment
5.3.1 Before leaving the factory, each equipment shall be subjected to a water pressure test. Bending strength
Line Expansion coefficient
5.3.2 The overall dimensions and nozzle orientation of the equipment shall comply with the requirements of the drawings or product standards. Bonding strength
Shear strength
5.3.3 When the design documents or users require an airtightness test, the test method and test pressure may be determined by negotiation between the manufacturer and the user or executed in accordance with the manufacturer's standards.
5.3.4 The main items of the overall water pressure test of the equipment and the mandatory inspection items of raw materials (tensile strength, bending strength, bonding strength, shear strength) must meet the requirements.
5.4 Type inspection
5.4.1 Type inspection is required if one of the following conditions is met. a.
Equipment trial production and appraisal;
Major changes have been made to raw materials, manufacturing process, structure, etc.; b.
Production is resumed after a long period of suspension;
During normal production, type inspection shall be conducted no less than once a year. 5.4.2 Type inspection items
The physical and mechanical properties of unimpregnated graphite and impregnated graphite blocks shall comply with the items specified in Table 1 of Article 3.1.1; the physical and mechanical properties of adhesives shall comply with the items specified in Table 2 of Article 3.1.2; the physical and mechanical properties of HG2370 impermeable graphite tubes shall comply with the items specified in Table 2 of Article 5.5 of HG/T2059: c.
d. Appearance and geometric dimensions of parts;
designed overall dimensions, nozzle orientation, water pressure test, etc. e.
5.4.3 There shall be no less than 2 units of each series of products to be type-tested, and the test samples shall be randomly selected from the qualified products inspected before leaving the factory. 5.4.4 During the product type-test, if any one of the physical and mechanical properties of the impregnated graphite block, adhesive and impermeable graphite tube is found to be unqualified, the sampling shall be doubled; if it is still unqualified after re-testing, it shall be judged as a defective product. 5.4.5 If any one of items d or e in the type-test items is unqualified, it is allowed to be repaired once; if it still fails to meet the requirements after repair, it shall be judged as a defective product.
6 Marking, packaging, and transportation
6.1 Marking
6.1.1 The marking should be installed in a conspicuous position, and the nameplate of the marking should at least include the following content: a.
Manufacturer name:
b. Equipment name and model;
e Weight;
d Product trademark;
Main performance parameters;
Manufacturing date and abbreviation;
g. Container category and inspection department.
6.1.2 All graphite equipment or parts under pressure must be marked with the inspection mark of the labor department. 6.2 Packaging and transportation
6.2.1 When there are no special requirements for the equipment shell, spray protective paint. 6.2.2 All pipes in the equipment are sealed with blind plates. Parts and accessories should be packed and transported together with the equipment. The steel shell of the equipment must be fixed on the bottom bracket, and the bottom bracket must be stable. There should be a certain contact surface between the bracket and the equipment. Eye-catching marks such as "fragile" and "handle with care" should be marked on obvious parts of the packaging box. 6.2.3 The factory documents should be delivered to the user together with the equipment. The factory documents mainly include: a.
Product instruction manual;
Product certificate and product quality certificate; parts list;
The equipment should have a pressure vessel inspection certificate. The equipment should be gently lifted and placed when transported, and it should not be pulled or dragged on the ground. Graphite parts should not be moved with pry bars or tied with steel wire. Additional notes:
This standard was proposed by China National Chemical Equipment Corporation, and this standard is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhou Jie.
From the date of implementation of this standard, the former standard HG5-1319-80 "Technical Conditions for Graphite Equipment" issued by the Ministry of Chemical Industry shall be invalidated. 5
People's Republic of China
Chemical Industry Standard
Technical Conditions for Graphite Chemical Equipment
HG2370-92
Editor: Chemical Industry Standard Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printing: Standardization Research Institute of the Ministry of Chemical Industry
Copyright: No Reproduction
Format: 880×12301/16 Number of Words on a Printing Sheet: 10000 First Printing in July 1993
First Edition in July 1993
Number of Printings: 1-300
Product instruction manual;
Product certificate and product quality certificate; Parts list;
The equipment to be regulated should have a pressure vessel inspection certificate. The equipment should be gently lifted and placed when transported, and should not be dragged on the ground. Graphite parts should not be moved with a pry bar or tied with steel wire. Additional notes:
This standard was proposed by China National Chemical Equipment Corporation, and this standard is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhou Jie.
From the date of implementation of this standard, the former standard HG5-1319-80 "Technical Conditions for Graphite Equipment" issued by the Ministry of Chemical Industry shall be invalidated. 5
People's Republic of China
Chemical Industry Standard
Technical Conditions for Graphite Chemical Equipment
HG2370-92
Editor: Chemical Industry Standard Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printing: Standardization Research Institute of the Ministry of Chemical Industry
Copyright: No Reproduction
Format: 880×12301/16 Number of Words on a Printing Sheet: 10000 First Printing in July 1993
First Edition in July 1993
Number of Printings: 1-300
Product instruction manual;
Product certificate and product quality certificate; Parts list;
The equipment to be regulated should have a pressure vessel inspection certificate. The equipment should be gently lifted and placed when transported, and should not be dragged on the ground. Graphite parts should not be moved with a pry bar or tied with steel wire. Additional notes:
This standard was proposed by China National Chemical Equipment Corporation, and this standard is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhou Jie.
From the date of implementation of this standard, the former standard HG5-1319-80 "Technical Conditions for Graphite Equipment" issued by the Ministry of Chemical Industry shall be invalidated. 5
People's Republic of China
Chemical Industry Standard
Technical Conditions for Graphite Chemical Equipment
HG2370-92
Editor: Chemical Industry Standard Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printing: Standardization Research Institute of the Ministry of Chemical Industry
Copyright: No Reproduction
Format: 880×12301/16 Number of Printed Sheets: 10000 First Printing in July 1993
First Edition in July 1993
Number of Prints: 1-300
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