HG/T 2128-1991 Technical requirements for chemical equipment, pipes and fittings made of acid-resistant phenolic plastics
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2128-91
Technical Conditions for Chemical Equipment,
Tubes and Fittings Made of Acid-Resistant Phenolic Plastics
Issued on August 19, 1991
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1992
Chemical Industry Standard of the People's Republic of China
Technical Conditions for Chemical Equipment,
Tubes and Fittings Made of Acid-Resistant Phenolic Plastics
1 Subject Content and Scope of Application
HG/T2128—91
This standard specifies the technical conditions for the manufacture, inspection, acceptance, packaging, storage and transportation of chemical equipment, pipes and fittings made of acid-resistant phenolic plastics.
This standard applies to chemical equipment, pipes and fittings made of acid-resistant phenolic plastics with phenolic resin as adhesive and acid-resistant asbestos as filler. The allowable temperature is -30℃～130℃. The manufacture, inspection, acceptance and installation of chemical equipment, pipes and fittings made of acid-resistant phenolic plastics shall comply with this standard in addition to the requirements of the design documents.
2 Reference standards
GB1033 Test method for density and relative density of plastics Test method for water absorption of plastics
GB1034
GB1035
GB1036
GB1040
GB1041
GB1042
Test method for heat resistance (Martin) of plastics
Determination method for linear expansion coefficient of plastics
Test method for tensile strength of plastics
Compression test of plastics Test method
Test method for plastic bending
GB1043 Test method for plastic impact (simple beam type)GB1054
Test method for fiber reinforced plastic Barcol hardness HG2-
—151 Test method for shear strength of plastic adhesive material GB9342
Test method for Rockwell hardness of plastic
Determination method for solid content of unsaturated polyester resin HG5-1338
HG5-1339
HG5-1341
HG/T2106
HG/T2107
.3 Technical requirements
Test method for polymerization rate of phenolic resin
Test method for viscosity of high viscosity phenolic resin
Determination method for moisture content in phenolic resin
Acid-resistant phenolic resin Determination of acid resistance of plastics
Determination of acetone soluble matter in acid-resistant phenolic plastics3.1 Requirements for raw materials and materials
3.1.1 The acid resistance of fillers (acid-resistant asbestos) used in acid-resistant phenolic plastics shall be greater than 85% for level 4, greater than 83% for level 5, and greater than 81% for level 6.
3.1.2 The quality indicators of phenolic resins shall meet the requirements of Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on August 19, 1991 and implemented on January 1, 1992
Free phenol content, %
Polymerization speed, s
Falling ball viscosity, .min
Water content, %
Solid content in resin, %
HG/T2128-91
Resin variety
No. 1 phenolic resin
60~180
Extrusion 10~ 30 Jade plate 30~90
Note: No. 1 phenolic resin is used as an adhesive for acid-resistant phenolic plastics; No. 3 phenolic resin is used as phenolic varnish. 3.1.3 The physical and chemical properties of acid-resistant phenolic plastics shall comply with the requirements of Table 2. Table 2
Indicator name
Density, g/cm
Impact strength, milk
Flexural strength, MPa
Tensile strength, MPa||t t||Shrinkage strength, MPa
Rockwell hardness, HrR
Martin's heat resistance, ℃
Linear expansion coefficient, 1/℃
Acid resistance, %
Water content (sampling), %
3.2 Quality requirements for acid-resistant phenolic plastic soft boards 3.2.1 Appearance:
No. 3 phenolic resin index
50~100
(1.5~3. 0) ×10-5
There should be no bubbles, cracks, impurities and oil stains on the surface of the soft board b. The diameter of the concave and convex parts on the soft board surface shall not exceed 15mm, and the degree of concave and convex shall be within the thickness deviation range. There shall be no more than 6 places per square meter.
The asbestos fibers on the surface and cross section of the soft board shall be evenly distributed, and there shall be no asbestos bundles that are not impregnated with resin. c.
3.2.2 The dimensions and deviations of the acid-resistant phenolic plastic soft board are shown in Table 3. Table 3
The physical and chemical properties of the acid-resistant phenolic plastic soft board are shown in Table 4. Length × Width
1000×1000
Carnitine, %
Density, g/cm3
Water, %
Indicator Name
Solubility of resin (to acetone solution) Agent), %
HG/T212891
3.3 Quality requirements for acid-resistant phenolic plastic hardboard3.3.1 Hardboard warpage: When the board thickness is greater than 10mm, it can be no greater than 10mm within a length of 1m.3.3.2 The physical and chemical properties of the hardboard should meet the quality requirements of Table 2.3.4 Quality requirements for acid-resistant phenolic mortar
3.4.1 The surface and cross-section of the mortar should not have obvious asbestos bundles that are not impregnated by resin, and pores are not allowed.3.4.2 The acid resistance, Martin heat resistance and impact strength of the mortar should meet the relevant provisions in Table 2. The bonding shear strength of the mortar (for acid-resistant phenolic plastic)>10MPa.3.4.3
3.5 Product quality requirements
3.5.1 Hardening degree of surface paint film: After repeated wiping with an alcohol cotton ball, the cotton ball should have no obvious color change. 3.5.2
The Barcol hardness should be greater than 45.
Dimensions, deviations and allowable pressures
Diameter deviation
The dimensional deviation and allowable pressure of the equipment should comply with the requirements of Table 5. Table
Nominal diameter, mm
Machine processing (flange)
Non-machine processing
Thickness deviation, mm
End face verticality, mm
Allowable pressure, MPa
Length deviation, mm
Roundness, mm
300~350
400~450
L1000±4
Atmospheric pressureAtmospheric pressureAtmospheric pressure
L>1000±6
Within the allowable diameter deviation range
The dimensional deviation and allowable pressure of flanged pipes shall comply with the provisions of Table 6. 3.5.3.2
Nominal diameter, mm
Diameter deviation Difference
Machining (flange
Non-machining
Thickness deviation, mm
End face verticality, mm
Allowable pressure, MPa
Length deviation, mm
Roundness, mm
125~150
200~300
Within the allowable diameter deviation range
3.5.3.3 The dimensional deviation and allowable pressure of flanged pipe fittings shall comply with the provisions of Table 7. 350450
500~550
Diameter deviation
Nominal diameter, mm
Machining (flange)
Non-machining
Thickness deviation, m m
Verticality of end face, mm
Angle deviation of both end faces (degrees)
Permissible pressure, MPa
Length deviation, mm
Roundness, mm
HG/T2128-91
80~100
125~150
200~300
Within the allowable diameter deviation range
3.5.3.4 The dimensional deviation and allowable pressure of flangeless pipes and fittings shall comply with the provisions of Table 8, Table 8
Nominal diameter, mm
Diameter deviation, mmwwW.bzxz.Net
Thickness deviation, mm
Length deviation, mm
Both end faces Angle deviation (degrees)
Allowable pressure, MPa
Degrees, mm
Within the allowable diameter deviation range
350~450
500~550
3.5.3.5 Water pressure test of pressure-bearing components: The test pressure should be 1.5 times the allowable pressure, and there should be no leakage when the test pressure is maintained for 3 minutes. 3.5.-4 Appearance
The surface should be smooth and flat, without bubbles, cracks and defects that affect use. Traces of molded joints and lap joints are allowed. b.
Inspection method
4.1 Inspection of raw materials
4.1.1 The free phenol content of phenolic resin shall be determined according to the test method of HG5-1342.4.1.2 The solid content of phenolic resin is determined according to the test method of GB7193.3. 4.1.3 The polymerization speed of phenolic resin is determined according to the test method of GB5-1338. The viscosity of phenolic resin is determined according to the test method of HG5-1339. 4.1.4
, 4.1.5 The moisture content of phenolic resin is determined according to the test method of HG5-1341. The resin solubility rate (to acetone solvent) in acid-resistant phenolic plastic soft board is measured according to the test methods of ZBG94028 and HG/T2107. 4.1.6
4.2 Inspection of physical and chemical properties of products
Density is determined according to the test method of GB1033,
Impact strength is determined according to the test method of GB1043. 4.2.2
Flexural strength is determined according to the test method of GB1042. 4.2.3
The tensile strength shall be determined according to the test method of GB1040, and the compressive strength shall be determined according to the test method of GB1041.4.2.6 Hardness shall be determined according to:
HG/T2128-91
AGB3854 test method for hardness of finished products, and BGB9342 test method for hardness of materials.4.2.7 Heat resistance shall be determined according to the test method of GB1035, 4.2.8 Linear expansion coefficient shall be determined according to the test method of GB1036, 4.2.9 Acid resistance shall be determined according to the test method of HG/T2106, 4.2.10 Water absorption shall be determined according to the test method of GB1034, 4.2.11 Adhesive shear strength shall be determined according to the test method of HG2-151, 4.2 Appearance inspection
Measured by visual inspection under normal light, it shall meet the requirements of 3.5.4. 4.4 Dimensional inspection
The geometrical dimensions of the product shall be inspected according to the standard using calibrated measuring instruments. The warpage of the hard board shall be measured by placing a 1m long steel ruler on the board surface, and then the depth of the gap at the most concave part shall be measured with a depth gauge. The verticality of the end face of the product shall be checked with an angle ruler. 4.5 Inspection of pressure-bearing components
The pressure-bearing components shall be subjected to a water pressure test according to the requirements of 3.5.3.5 5 Inspection rules
5.1 The appearance quality of the product shall be inspected piece by piece 5.2 The water pressure test of the product shall be carried out piece by piece. If there is leakage, it shall be re-inspected after repair. The number of repairs shall not exceed 2 times. If there is still leakage, it is a defective product.
5.3 Product geometrical dimension inspection: non-standardized products shall be inspected piece by piece according to the drawing, and standardized products shall be inspected by batch sampling inspection method according to GB2828.
5.4 Physical and chemical properties inspection of acid-resistant phenolic plastic materials, with each batch of resin produced as a batch. Focus on testing tensile strength and impact strength, and conduct comprehensive sampling once a month. The quality should meet the requirements of Table 4. If any of the above tests fails, double the sample should be taken for re-testing. If it still fails, the batch of materials is unqualified. 6 Packaging, marking, and transportation
6.1 Packaging
6.1.1 When packaging large equipment with branches, use straw ropes to tie them and then put them in wooden crates. If there are no wooden crates, the branch pipes should be tied with wooden crates to prevent them from being damaged during transportation.
6.1.2 When packaging pipes, two small-diameter straight pipes with a diameter less than 100mm are bundled into one piece and packaged with straw ropes; pipes with a diameter greater than 100mm are bundled into one piece and packaged with straw ropes. 6.1.3 When packaging pipe fittings, two identical pieces with a diameter less than 100mm are bundled into one piece with straw ropes. For pipe fittings with a diameter greater than 100mm, each piece is bundled with straw ropes and placed in a wooden crate. When more than two pieces are placed in the same crate, soft objects are used to fill the fixed position. 6.1.4 When packaging, the product should have a packing list and a product inspection certificate. 6.2 Marking
6.2.1 Product name and specifications
6.2.2 Manufacturer name.
6.2.3 When the molded parts are pressed, the logo is pressed on them; rolled parts and extruded parts are marked on one end of the product with paint. 6.3 Purchase and transportation
6.3.1 The name, specifications, destination, factory name and manufacturer name, and total weight of the product should be clearly indicated. 6.3.2 When wooden boxes are used for packaging, the dimensions of the boxes (length × width × height), year, month, day and batch number should be clearly indicated. The boxes should be marked with signs such as "Be careful, handle with care", "Upward", and "Do not turn upside down". HG/T2128-91
Appendix A
Scope of use of chemical equipment, pipes and fittings made of acid-resistant phenolic plastic (reference part)
Scope of use of chemical equipment, pipes and fittings made of acid-resistant phenolic plastic is shown in Table 9. Table 9
Name of medium
, citric acid
Salts of the above acids
Hydrogen chloride (gas)
Sulfur dioxide
Hydrogen sulfide (gas)
Carbon tetrachloride
Formaldehyde aqueous solution
Ethylene dichloride
Sodium chloride aqueous solution
Acidic electrolyte (Cu, Zn, Ni)
Chlorosulfuric acid
Industrial benzene
Chlorine extraction mixture
Manganese sulfate electrolyte
Citric acid plant
Aluminum silicate,
Fluorosilicic acid
Mixed liquid
Mixed liquid
Medium content, %
Any concentration
Below 70
Any concentration
Any concentration
Any concentration
Industrial pure
Any concentration
Medium temperature, ℃
Medium name
Carbon dioxide gas,
Alkali dioxide
Mixed gas
Mixed liquid
Hydrochloric acid, sodium sulfate,
Peregrin
Detergent
Mixed liquid
Mixed liquid
HG/T2128-91
Continued Table 9
Medium content, %
Cr-7~9 Na*4~5
Nit5~6
Medium temperature, ℃
Chemical equipment, pipes and fittings made of acid-resistant phenolic plastic are not resistant to nitric acid, chromic acid, bromine, aniline, pyridine, strong alkali, ethanol, etc. Appendix B
Precautions for the use and installation of chemical equipment, pipes and fittings made of acid-resistant phenolic plastic (reference)
B1 General requirements for product installation
B1.1 Before installation, the equipment and pipelines must be inspected and tested according to the installation drawings or relevant design documents. The products, brackets, foundations, workbenches, etc. must be inspected and tested separately. Only after they are qualified can they be installed. B1.2 The brackets and frames should have sufficient strength and stability, and should be coated with an anti-rust layer after installation to avoid medium corrosion. During the installation of the product, collisions should be strictly prohibited. B1.3
Equipment and pipelines should not be installed in places with severe vibration. B1.4
B1.5When installing equipment and pipelines, the bolts should be tightened in sequence along the diagonal line, and no skewing is allowed. Strictly prevent uneven tightness, resulting in poor sealing or breaking the flange.
B1.6After the equipment and pipelines are installed, they must be inspected and tested for water pressure in accordance with the provisions of the documents. During the test, the pressure should rise steadily to prevent the equipment and pipelines from being damaged by the impact of the sudden increase in water pressure. The test pressure is 1.5 times the allowable pressure. After maintaining the test pressure for 10 minutes, it is reduced to the operating pressure. The inspection is qualified if there is no leakage. B2 Installation of flanged pipelines
B2.1When pipes and pipe fittings are connected by flanges, the two pipe ends must be padded with soft corrosion-resistant materials with a thickness of not less than 3mm. B2.2 The flange surface should be perpendicular to the center line of the main axis of the pipe or container. The flange surface inclination and verticality should be ensured when installing the pipe flange. The allowable deviation should not exceed 2/100 of the flange outer diameter (the flange outer diameter is less than 100mm and is calculated as 100mm) and should not exceed 10mm.
B2.3 When installing the pipeline, it should not be twisted or knocked. Generally, the support distance should not be greater than 2m, and the pipeline should not be cantilevered. B2.4
When the pipeline works under the condition of large temperature changes and long pipelines, compensation devices should be added. HG/T212891
B2.5 When the pipeline is installed near alkali and other phenolic plastics that have corrosive effects on media, appropriate protective measures should be taken. B3 Installation of socket-type pipes
B3.1 When connecting and installing pipes and fittings, the pre-bonding parts of the pipes and fittings should be machined first and kept clean. When bonding and installing, a triangular fixing frame should be provided and positioned according to the installation design. Then the pipes and fittings should be placed and positioned together with the bracket while bonding. When installing vertically, they should be bonded piece by piece from bottom to top to ensure verticality. Cantilever installation should not be performed. B3.2 When connecting and installing pipes and fittings, one-way flange connections should be used for frequently disassembled parts and turning parts. Before pre-bonding, the phenolic fiberglass flat flange should be placed first, and then the one-way flange should be bonded. Generally, two-way joints should be used for parts that are not often disassembled. B3.3 When installing pipes and pipe fittings, all one-way flange connections should be padded with soft corrosion-resistant materials with a thickness of not less than 3mm. When tightening the bolts, they should be evenly tightened in sequence along the diagonal lines without being skewed. The phenolic glass fiber reinforced plastic flat flange should be evenly placed on the one-way flange surface. It is strictly forbidden to cause poor sealing or break the flange and flat flange due to uneven tightness. B3.4 When installing pipes and pipe fittings, there should generally be a thermal compensator of corresponding specifications. B3.5 After the pipeline is installed, the bonding condition of the bonding parts should be carefully checked. And maintain at room temperature for more than 7 days, then conduct water pressure test in the whole system: the test pressure is 15 times the allowable pressure, maintain the test pressure for 10 minutes, then drop to the operating pressure for inspection, and pass if there is no leakage.
B4 Installation of towers and containers
B4.1 When installing towers and containers, the brackets and operating tables must be firm to prevent shaking and tilting. B4.2 Towers and containers should be installed stably on the foundation to prevent damage to the equipment due to local contact surfaces. Generally, elastic soft pads are placed at the bottom of towers and containers. If there are vibrating towers and containers, they should be fixed after installation to prevent movement during use. B4.3 When installing towers, there should be no bubbles or cracks in the glue seal of the interface. B4.4 The installation of towers and containers shall comply with the general provisions of product installation in addition to complying with the design drawings and relevant regulations. Appendix C
Permissible pressure of chemical equipment, pipes and fittings made of acid-resistant phenolic plastic at high and low temperatures (reference)
The allowable pressure of chemical equipment, pipes and fittings made of acid-resistant phenolic plastic at high and low temperatures is shown in Table 10 Table 10
Nominal diameter Dg, mm
80~100
125~15 0
200~300
350~450
500~550
600~800
1000~1200
Below 100℃
Atmospheric pressure
Permissible pressure, MPa
100℃130℃
Atmospheric pressure
Additional instructions:
This standard is proposed by China National Chemical Equipment Corporation. HG/T212891
This standard is under the jurisdiction of the Chemical Machinery Research Institute of the Ministry of Chemical Industry. Chongqing Guanghua Chemical Plant, Chongqing Synthetic Chemical Plant, and the Chemical Machinery Research Institute of the Ministry of Chemical Industry are responsible for drafting this standard. The main drafters of this standard are Kong Lingkun, Wang Shurong, and Chen Guangming. People's Republic of China
Chemical Industry Standard
Technical Conditions for Chemical Equipment,
Tubes and Fittings Made of Acid-Resistant Phenolic Plastics
HG/T212891
Editor Chemical Industry Standards Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Printer Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880×12301/16 Printing Sheet 4 Words 16000 First Edition December 1992 First Printing December 1992 Printing 1-500
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