GB/T 4219-1996 Unplasticized polyvinyl chloride (PVC-U) pipes for chemical industry GB/T4219-1996 Standard download decompression password: www.bzxz.net

GB/T 4219-1996
This standard is a revision of GB 4219-84 based on relevant international standards. Through the revision of this standard, this standard is more suitable for the application and production needs of plastic pipes for chemical industry in my country. After the revision, the specification and size series of the standard conform to ISO161/I:1978 "Thermoplastic Pipes for Fluid Transportation - Nominal Outside Diameter and Nominal Pressure - Part I: Metric Series", and the wall thickness conforms to ISO4065:1978 "Thermoplastic Pipes - Common Wall Thickness Table"; the technical requirements are in accordance with the relevant national standards, and the indicators and test methods are standardized (most of which adopt international standards). This standard mainly revise the following contents:
1. The outside diameter and deviation of the pipe, the wall thickness deviation and the pressure level are revised. 2. The pipe size change rate is revised. 3. The hoop stress of the pipe hydraulic test is revised. 4. The tensile yield stress is added.
This standard shall replace GB4219-84 from the date of entry into force. Appendix A of this standard is a reminder appendix.
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. The drafting units of this standard are: Yantai No. 1 Plastic Factory and Xiamen Zhongwang Plastic Co., Ltd. The main drafters of this standard are: Liu Shuling, Huang Jie, Wang Zheng, Yin Tongliang, Pan Qijin, Jianping. 8
1 Scope
National Standard of the People's Republic of China
Unplasticized polyvinyl chloride (PVC-U) pipes for chemical industry
GB/T 4219
Replaces GB4219-84
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of unplasticized polyvinyl chloride (PVC-U) pipes for chemical industry (hereinafter referred to as pipes) made of polyvinyl chloride resin as the main raw material and extruded. This standard is applicable to pipes for conveying certain corrosive chemical fluids with a temperature below 45°C. For certain fluids that are not suitable for conveying, see Appendix A. It can also be used to convey pressure fluids such as non-drinking water. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1033--86Test method for density and relative density of plasticsGB2828-87Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB4218-84Test method for corrosion resistance of rigid polyvinyl chloride pipes for chemical industryGB 6111--85
Determination method for the damage resistance time of thermoplastic plastic pipes under long-term constant internal pressureGB6671.186Determination of longitudinal shrinkage rate of rigid polyvinyl chloride pipes (PVC)GB 8802-88
Determination method for Vicat softening temperature of rigid polyvinyl chloride (PVC-U) pipes and fittingsGB8804.1--88Test method for tensile properties of thermoplastic pipesPolyvinyl chloride pipesGB 8805-88
GB 8806-88
GB 9646-88
GB 10798-89
GB 13020—91
3 Product classification
Method for measuring the bending of rigid plastic pipes
Method for measuring the size of plastic pipes
Test method for acetone resistance of rigid polyvinyl chloride (PVC-U) pipesUniversal wall thickness table for thermoplastic plastic pipes
Limit deviation of outer diameter and wall thickness of rigid polyvinyl chloride (PVC-U) pipes3.1 Pipes are divided into five grades according to working pressure: PNO.4, PNO.6, PNO.8, PN1.0 and PN1.6MPa. They are suitable for pipeline systems at 20℃. If the operating temperature is different, the working pressure should be calibrated according to Table 1. Table 1 Relationship between temperature and pressure
Temperature t, ℃
25<≤35
Approved by the State Bureau of Technical Supervision on April 10, 1996Coefficient corresponding to nominal pressure
Implementation on December 1, 1996
Pipe specifications and dimensions are shown in Table 2.
GB/T 4219—1996
Table 2 Pipe specifications and deviations
Nominal pressure, MPa
Pipe series
Nominal value Limit deviation Nominal value Limit deviation Nominal value Limit deviation Nominal value Limit deviation Nominal value Limit deviation 2.0
Nominal value Limit deviation
GB/T4219—1996
Table 2 (End)
Nominal pressure, MPa
Pipe series
Nominal value Limit deviation
Nominal value Limit deviation
Nominal value Limit deviation
Nominal value Limit deviation
The wall thickness is determined based on the 20℃ annular (induced) stress o, which is 6.3MPa. The pipe series (S) is derived from s/p. 16.6
If other specifications and wall thicknesses are required, they can be selected according to GB10798, and the outer diameter and wall thickness deviations are selected according to GB13020. 2
3For pipes with a ratio of e/d. less than 0.035, the outer diameter limit deviation of any part shall not be assessed. 4 Technical requirements
4.1 The specifications, dimensions and deviations of the pipes shall comply with the provisions of Table 2. The length is 4±0.02m; 6±0.02m or according to user requirements. 4.2 Color: Generally gray, but can also be determined by negotiation between the supply and demand parties. +2.8
4.3 Appearance: The inner and outer walls of the pipes shall be smooth, flat, without dents, decomposition discoloration lines and other surface defects that affect performance. The pipes shall not contain visible impurities. The pipe ends shall be cut flat and perpendicular to the axis of the pipe. 4.4 Wall thickness deviation rate: The wall thickness deviation rate of the same section of the pipe shall not exceed 14%. 4.5 The curvature shall comply with the provisions of Table 3.
Table 3 Curvature
Outer diameter of pipe, mm
Curvature, %
Not specified
4.6 Physical and chemical performance indicators of pipes shall comply with the provisions of Table 4. 40~200
Physical and chemical properties of pipes
Indicator name
Density, g/cm3
Corrosion (hydrochloric acid, nitric acid, sulfuric acid, sodium hydroxide), g/mVicat softening temperature, ℃
Hydraulic test
Longitudinal shrinkage, %
Acetone immersion
Tensile yield stress, MPa
Test method
5.1 Appearance and color
Observe directly with the naked eye, and the inside can also be illuminated by a light source. 5.2 Measurement of pipe dimensions
5.2.1 Length
Measure with a ruler with an accuracy of 1mm.
5.2.2 External diameter limit deviation
Measure according to the provisions of GB8806.
5.2.3 Wall thickness limit deviation
Measure the wall thickness deviation value according to the provisions of GB8806. 5.3 Wall thickness deviation rate
No rupture, no leakage
No delamination, no fragmentation
No cracks, no rupture
Use the wall thickness measurement results of 5.2.3 to calculate the wall thickness deviation rate of each sample in the same section. The calculation formula is: er
Where: e — wall thickness deviation rate in the same section, %; emax
emax — maximum wall thickness measured on the same section, mm; — minimum wall thickness measured on the same section, mm. emin
5.4Bending degree of pipe
Determine according to GB8805.
5.5Physical and chemical properties
5.5.1Density
Determine according to method A of GB1033.
5.5.2Corrosion
≥225
Test method
（1）
Determine according to GB4218.
5.5.3Vicat softening temperature
Determine according to GB8802.
5.5.4Hydraulic test
GB/T 4219 --- 1996
According to GB6111, the test temperature is 20±2℃, the hoop stress is 42MPa, and the test time is 1h. 5.5.5 Longitudinal shrinkage
Measured in accordance with GB6671.1.
5.5.6 Acetone immersion
Tested in accordance with GB9646.
5.5.7 Flat
5.5.7.1 Sample
Take a section of 50±2 from each of the three tubes.0mm pipe section, both ends should be cut flat and perpendicular to the axis. Condition the sample at 23±2℃ for 24h and test under the same conditions. 5.5.7.2 Test steps
Place the sample horizontally between the upper and lower pressure plates of the test equipment specified in GB8804.1, compress the sample at a speed of 10±5mm/min, and unload immediately when it is compressed to 1/2 of the outer diameter. The three samples are qualified without damage or rupture. 5.5.8 Tensile yield stress
Determine according to GB8804.1.
6 Inspection rules
6.1 Products must be inspected by the quality inspection department of the manufacturer and accompanied by a certificate of conformity before they can leave the factory. 6.2 Batch: The same specification pipes produced with the same raw materials, formula and process are regarded as a batch, and the quantity of each batch shall not exceed 100t. If the production quantity is small and the production period is less than 100t in 7 days, the production in 7 days shall be regarded as a batch. 6.3 Factory inspection:
6.3.1 The factory inspection items are corrosion, longitudinal shrinkage, flatness, hydraulic pressure, and acetone diffusion in 4.1~4.5 and 4.6. 6.3.24.1~4.5 inspections shall adopt a normal inspection one-time sampling plan according to GB2828, taking the general inspection level I and the qualified quality level 6.5, see Table 5.
Table 5 Sampling plan
Batch range N
151~280
281~500
501~1200
1201~3200
3 201~10 000
Sample size n
Qualified judgment number A.
Unqualified judgment number R.
6.3.3 Randomly select no less than three samples from the qualified samples of counting sampling and conduct the performance test in 4.6. 6.4 Type inspection: The type inspection items are all technical requirements items. 4.1~~4.5 shall be inspected according to the provisions of 5.1~~5.5, and sufficient samples shall be randomly selected from the qualified samples to conduct the performance inspection of 4.6. Generally, at least once a year. If one of the following situations occurs, type inspection shall be carried out.
a. Trial determination and identification of new products or old products for transfer to factory production; after formal production, if there are major changes in structure, materials, and processes, which may affect product performance; b.
When the product is resumed after long-term suspension of production; c.
GB/T4219—1996
d When the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes the requirement for type inspection. e.
6.5 Judgment rules: 4.1~4.5 shall be judged according to the provisions of Table 5. 4.6 When one of the performance indicators fails to meet the specified requirements, double samples may be drawn for re-testing of the item. If it is still unqualified, the batch shall be judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 The product shall have obvious markings: product name, specification (d.Xe), this standard number and manufacturer name (or trademark), factory address. 7.2 Packaging
Perform according to user requirements.
7.3 TransportationbzxZ.net
Pipes shall not be subjected to severe collision, throwing, or exposure during transportation. 7.4 Storage
Pipes shall be stored flat in a warehouse with a temperature not exceeding 40℃, and the stacking height shall not exceed 2m. Keep away from heat sources and prohibit long-term storage in the sun.
Name of chemical drugs
Acetic anhydride
Propylene alcohol
Valeracetic acid
Aniline hydrochloride
Benzaldehyde
Benzoic acid
Butyl acetate
Butylphenol
Hydrofluoric acid (gas)
Methyl methacrylate
Oleum
Perfluoric acid
Gasoline (chain hydrocarbon/benzene)
GB/T 4219—1996
Appendix A
(Suggested Appendix)
Fluids that are not suitable for transportation by rigid polyoxyethylene pipes Table A1
Sat sol
10%～90%
50%~98%
10%SOs
Saturated aqueous solution prepared at 20℃.
Note: Sat.sol
Chemical drug name
Carbon disulfide
Carbon tetranitride
Chlorine (dry)
Fluorosulfonic acid
Toluic acid
Crotonaldehyde
Cyclohexanol
Cyclohexanone
Ethylene chloride
Difluoromethane
Ethyl acetate
Ethyl acrylate
Sugar alcohol resin
Hydrofluoric acid
Hydrofluoric acid
Phenylhydrazine hydrochloride
Phosphorus chloride (trivalent)
Sulfur dioxide
Dichlorofluoroethylene
Vinyl acetate
Mixed xylene4 Storage
Pipes should be stored flat in a warehouse where the temperature does not exceed 40℃. The stacking height should not exceed 2m. Keep away from heat sources and do not store in the sun for a long time.
Name of chemical drugs
Acetic anhydride
Propylene alcohol
Valeracetic acid
Aniline hydrochloride
Benzaldehyde
Benzoic acid
Butyl acetate
Butylphenol
Hydrofluoric acid (gas)
Methyl methacrylate
Oleum
Perfluoric acid
Gasoline (chain hydrocarbon/benzene)
GB/T 4219—1996
Appendix A
(Suggested Appendix)
Fluids that are not suitable for transportation by rigid polyoxyethylene pipes Table A1
Sat sol
10%～90%
50%~98%
10%SOs
Saturated aqueous solution prepared at 20℃.
Note: Sat.sol
Chemical drug name
Carbon disulfide
Carbon tetranitride
Chlorine (dry)
Fluorosulfonic acid
Toluic acid
Crotonaldehyde
Cyclohexanol
Cyclohexanone
Ethylene chloride
Difluoromethane
Ethyl acetate
Ethyl acrylate
Sugar alcohol resin
Hydrofluoric acid
Hydrofluoric acid
Phenylhydrazine hydrochloride
Phosphorus chloride (trivalent)
Sulfur dioxide
Dichlorofluoroethylene
Vinyl acetate
Mixed xylene4 Storage
Pipes should be stored flat in a warehouse with a temperature not exceeding 40°C. The stacking height should not exceed 2m. Keep away from heat sources and prohibit long-term storage in the sun.
Name of chemical drugs
Acetic anhydride
Propylene alcohol
Valeracetic acid
Aniline hydrochloride
Benzaldehyde
Benzoic acid
Butyl acetate
Butylphenol
Hydrofluoric acid (gas)
Methyl methacrylate
Oleum
Perfluoric acid
Gasoline (chain hydrocarbon/benzene)
GB/T 4219—1996
Appendix A
(Suggested Appendix)
Fluids that are not suitable for transportation by rigid polyoxyethylene pipes Table A1
Sat sol
10%～90%
50%~98%
10%SOs
Saturated aqueous solution prepared at 20℃.
Note: Sat.sol
Chemical drug name
Carbon disulfide
Carbon tetranitride
Chlorine (dry)
Fluorosulfonic acid
Toluic acid
Crotonaldehyde
Cyclohexanol
Cyclohexanone
Ethylene chloride
Difluoromethane
Ethyl acetate
Ethyl acrylate
Sugar alcohol resin
Hydrofluoric acid
Hydrofluoric acid
Phenylhydrazine hydrochloride
Phosphorus chloride (trivalent)
Sulfur dioxide
Dichlorofluoroethylene
Vinyl acetate
Mixed xylene
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