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Position: Chinese Standard in English/SY/T 0442-2018
SY/T 0442-2018   Technical standard for internal fusion-bonded epoxy coating of steel pipe (English Version)
Standard No.: SY/T 0442-2018 Status:valid remind me the status change

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Language:English File Format:PDF
Word Count: 20000 words Price(USD):500.0 remind me the price change

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Implemented on:2019-3-1 Delivery: via email in 1 business day
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Standard No.: SY/T 0442-2018
English Name: Technical standard for internal fusion-bonded epoxy coating of steel pipe
Chinese Name: 钢质管道熔结环氧粉末内防腐层技术标准
Professional Classification: SY    Professional Standard - Oil & Gas
Issued by: NEA
Issued on: 2018-10-29
Implemented on: 2019-3-1
Status: valid
Superseding:SY/T 0442-2010 Technical Standard for Internal Fusion Bonded Epoxy Coating of Steel Pipe
Language: English
File Format: PDF
Word Count: 20000 words
Price(USD): 500.0
Delivery: via email in 1 business day
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. This standard is a revision of the SY/T 0442-2010 Technical standard for internal fusion bonded epoxy coating of steel pipe according to Notice of the national energy administration on issuing the development (revision) plan of the professional standards in energy sector in 2016 (GUONENGKEJI [2016] No.238) (planned number of energy 20160197). During the revision process of this standard, the preparation team had conducted extensive investigations and summarized the domestic practical experience in the application of internal fusion-bonded epoxy coating for many years. This standard was formed by revising SY/T 0442-2010 on the basis of analysis, research and experimental verification, referring to relevant foreign standards. This standard comprises of 9 chapters and 5 annexes. The main technical contents include: generals, fabric of internal coating, materials, coating application, quality inspection, repair and re-coating, marks, storage and transportation, field joint coating and completion documents. The following technical contents have been made with respect to SY/T 0442-2010: 1 The performance requirements for epoxy powder and coatings are revised (see 3.2.3). 2 The requirements for procedure qualification trial are revised (see 4.1). 3 The requirements for coating application are revised (see 4.2). 4 The requirements for quality inspection are revised (see Clause 5). 5 The annex of cathodic disbonding resistance test method for anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. 6 The annex of test method for porosity of anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. 7 The annex of adhesion test method for anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. The National Energy Administration is in charge of the administration of this standard; the Standardization Committee on Petroleum Engineering is responsible for routine management; CNPC Engineering Technology R&D Company Limited is responsible for the explanation of specific technical contents. In the process of execution of this standard, all relevant organizations are kindly requested to, if found that this standard needs to be modified and supplemented, send opinions and suggestions to CNPC Engineering Technology R&D Company Limited (address: No.40, Jintang Highway, Tanggu, Binhai New Area, Tianjin City; post code: 300451), through combining engineering practices and carefully summarizing experience as well as accumulating documents. Contents 1 Generals 1 2 Fabric of internal epoxy coating 2 3 Materials 3 3.1 Steel pipe 3 3.2 Epoxy powder 3 4 Coating application 6 4.1 Procedure qualification trial 6 4.2 Coating application 7 5 Quality inspection 9 6 Repair and re-coating 11 6.1 Repair 11 6.2 Re-coating 11 7 Marks, storage and transportation 12 8 Field joint coating 13 9 Completion documents 14 Annex A Test method for curing time of epoxy powder 15 Annex B Test method for thermal characteristics of epoxy powder and coating 17 Annex C Test method for flexibility of coating 20 Annex D Test method for impact resistance of coating 22 Annex E Test method for autoclave 24 Explanation of wording in this standard 26 List of quoted standards 27 1 Generals 1.0.1 For the purpose of regulating the design, production and inspection of internal fusion-bonded epoxy coating, this standard is specially formulated. 1.0.2 This standard is applicable to the design, production and inspection of internal fusion-bonded epoxy coating of steel pipe transporting various oil products, natural gas and oil-gas field production water with operating temperature not exceeding 80℃. When the operating temperature exceeds 80℃, the applicability evaluation at the corresponding operating temperature shall be conducted. 1.0.3 The design, production and inspection of internal fusion-bonded epoxy coating of steel pipe shall meet the requirements of this standard, and the current relevant standards of the nation.   2 Fabric of internal epoxy coating 2.0.1 The internal epoxy coating should have fabric of one-time film formation. 2.0.2 The grade and thickness of the internal epoxy coating shall be selected according to factors such as medium corrosion, operating temperature and pressure. The minimum thickness shall meet the requirements of Table 2.0.2. Table 2.0.2 Minimum thickness of internal epoxy coating Coating grade Minimum thickness (μm) Ordinary grade ≥ 300 Reinforced grade ≥ 500   3 Materials 3.1 Steel pipe 3.1.1 The steel pipe prepared for coating application shall meet the requirements of current relevant standards of the nation or industry or ordering conditions. 3.1.2 The steel pipe manufacturer shall provide the quality certificate and certificate of approval of the steel pipe. 3.1.3 The coating factory shall inspect the appearance of steel pipes piece by piece, and the appearance shall meet the requirements of current standards of the nation or industry related to steel pipe or ordering conditions. 3.2 Epoxy powder 3.2.1 Appropriate epoxy powder shall be selected according to the characteristics of the transporting medium and construction requirements of the pipeline. 3.2.2 The epoxy powder shall have relevant technical documents like product specification, end-of-manufacturing certificate, quality certificate, end-of-manufacturing inspection report and safety data sheet provided by the manufacturer to prove that the epoxy powder meets the requirements of 3.2.3. At the time of delivery, the following contents shall at least be clearly marked on the outer package: 1) Manufacturer name and address. 2) Product name and model. 3) Production date and batch number. 4) Storage temperature and humidity. 5) Validity period, etc. 3.2.3 For each grade (type) of epoxy powder, the epoxy powder manufacturer shall provide the performance inspection report of epoxy powder and laboratory anti-corrosion coating meeting the requirements of Tables 3.2.3-1 and 3.2.3-2, and the report shall be issued by the inspection institution that has passed the national metrology certification. 3.2.4 Epoxy powder shall be sealed and kept dry and clean during shipment and storage. The coating factory shall store the epoxy powder in accordance with the temperature and humidity conditions recommended by the epoxy powder manufacturer. Table 3.2.3-1 Performance of epoxy powder No. Test item Quality index Test method 1 Appearance Uniform color, no agglomeration Visual inspection 2 Curing time (min) Complying with the value ±20% given by the powder manufacturer Annex A 3 Thermal characteristics ΔH (J/g) ≥ 45 Annex B Tg3 (℃) ≥98 and above the operating temperature of 40℃ 4 Gelatination time (s) Complying with the value ±20% given by the powder manufacturer GB/T 6554 5 Non-volatile-matter content (105℃) (%) ≥ 99.4 GB/T 6554 6 Mass loss during stoving (230℃, 5 min) (%) ≤1.0 GB/T 21782.7 7 Particle size distribution (%) 150 μm oversize powder ≤3.0 250 μm oversize powder ≤0.2 GB/T 21782.1 8 Density (g/cm3) 1.3~1.5 GB/T 4472 9 Content of magnetic material (%) ≤0.002 JB/T 6570 Table 3.2.3-2 Performance of laboratory epoxy powder coating No. Test item Quality index Test method 1 Appearance Flat, uniform color, no bubbles, no cracking or shrinkage cavity; slight orange peel pattern is allowed. Visual inspection 2 Thermal characteristics, |△Tg|(℃) ≤5 and in accordance with the characteristics given by the powder manufacturer Annex B 3 Cathodic disbonding (65℃, -1.5V, 48h or 65℃, -3.5V, 24h) (mm) ≤5 SY/T 0315 4 Bonding surface porosity (grade) 1~3 SY/T 0315 5 Section porosity (grade) 1~3 SY/T 0315 6 3° bending resistance (-30℃) No crack Annex C 7 Impact resistance (8J) No leakage point Annex D 8 Adhesion (95℃, 24h) (grade) 1~2 SY/T 0315 9 Adhesion with pull-off method (MPa) ≥ 20 GB/T 5210 10 Abrasion resistance (1kg/1,000r, CS-17 wheel) (mg) ≤35 GB/T 1768 11 Electric strength (MV/m) ≥30 GB/T 1408.1 12 Volume resistivity (Ω·m) ≥1×1013 GB/T 1410 13 Water absorption (80℃, 28d) (%) ≤15 GB/T 1034 14 Hot water soaking resistance (Tmax, 28d) Adhesion 1~2 SY/T 0315 Adhesion with pull-off method (MPa) ≥ 20 GB/T 5210 15 Resistance to salt spray (fog) (1,000h) No bubble, cracking or rust in the anti-corrosion coating GB/T 1771 16 Chemical resistance 10%HCl (90d at normal temperature) 3%NaCl (90d at normal temperature) 10%H2SO4 (90d at normal temperature) 10%NaOH (90d at normal temperature) No bubble, cracking, softening or peeling SY/T 0315 Crude oil (80℃, 90d) Oilfield sewage (80℃, 90d) Gasoline (90d at normal temperature) Kerosene (90d at normal temperature) Diesel (90d at normal temperature) No bubble, cracking, softening or peeling SY/T 0315 17 High temperature and pressure resistance test (80℃, 6.9MPa, 168h) No bubble, cracking, softening or peeling Annex E Notes: 1 Laboratory specimens, the thickness of anti-corrosion coating is 300μm~500μm. 2 Film sample used for water absorption test, the thickness should be 500μm±50μm. 3 The test medium and test temperature should be determined according to the working conditions for the corrosion test of chemical medium. 4 Additional test may also be determined according to the working conditions in high temperature and high pressure test conditions. 3.2.5 Before coating application, the epoxy powder used for the first time shall be inspected comprehensively according to corresponding items specified in Tables 3.2.3-1 and 3.2.3-2 of this standard, and the performance shall meet the specified requirements. Then, each batch of epoxy powder (no more than 30t) shall be sampled at least once for inspection. The performance of epoxy powder and its anti-corrosion coating shall be tested according to Items 2, 3, 4, 5, 6, 7, 8, 9 and 10 in Tables 3.2.3-1 and 3.2.3-2 of this standard, and the results shall meet the specified requirements.  4 Coating application 4.1 Procedure qualification trial 4.1.1 Prior to formal coating, the pre-procedure and inspection and trial plan (ITP) for the coating procedure of internal epoxy coating shall be prepared, and coating and inspection tests shall be conducted to confirm the coating quality and form the internal coating which shall meet the required application procedure specification (APS). 4.1.2 The APS shall be prepared according to this standard and engineering requirements, coating parameters recommended by the epoxy powder manufacturer and coating production line conditions. The contents shall cover all links of coating application and control of procedure parameters, and shall at least include the following main contents: 1 Complete information of raw materials, including data sheet of materials, recommended coating procedure and quality control requirements. 2 Surface treatment method and control requirements. 3 Steel pipe heating mode and temperature control requirements. 4 Coating procedure. 5 Inspection and test plan (including inspection contents, test methods, inspection frequency and control requirements). 6 Repair method for defect. 7 Marking regulations. 4.1.3 Coating shall be carried out in accordance with the pre-regulation of application procedure, and the steel pipe, coating production line and epoxy powder used shall be the same as those used in pipeline engineering. The appearance, thickness and leakage point of the steel pipe with internal epoxy coating coated in the procedure qualification trial (PQT) shall be inspected according to the performance items specified in Table 4.1.3, and the results shall meet the requirements. 4.1.4 When the steel pipe specification, coating line, raw material manufacturer or model change, the PQT shall be conducted again.
1 Generals 2 Fabric of internal epoxy coating 3 Materials 3.1 Steel pipe 3.2 Epoxy powder 4 Coating application 4.1 Procedure qualification trial 4.2 Coating application 5 Quality inspection 6 Repair and re-coating 6.1 Repair 6.2 Re-coating 7 Marks, storage and transportation 8 Field joint coating 9 Completion documents Annex A Test method for curing time of epoxy powder Annex B Test method for thermal characteristics of epoxy powder and coating Annex C Test method for flexibility of coating Annex D Test method for impact resistance of coating Annex E Test method for autoclave Explanation of wording in this standard List of quoted standards
Referred in SY/T 0442-2018:
*GB/T 1034-2008 Plastics - Determination of water absorption
*GB/T 1408.1-2016 Electrical strength of insulating materials - Test methods - Part 1: Tests at power frequencies
*GB/T 1410-2006 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
*GB/T 1768-2006 Method of test for abrasion resistance of paint films
*GB/T 1771-2007 Paints and varnishes—Determination of resistance to neutral salt spray(fog)
*GB/T 4472-2011 Detemination of density and relative density for chemical products
*GB/T 5210-2006 Paints and varnishes - Pull-off test for adhesion
*GB/T 6554-2003 Resin based reactive compounds used for electrical insulation - Part 2: Methods of test - Methods for coating pourders for electrical purposes
*GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated s
*GB/T 9274-1988 Paints and varnishes. Determination of resistance to liquids
*GB/T 13288.4-2013 Preparation of steel substrates before application of paints and related products―Surface roughness characteristics of blast-cleaned substrates―Part 4:Method for the calibration of ISO surface profile comparator and for the determination of surface prof
*GB/T 13288.5-2009 Preparation of steel substrates before application of paints and related products - Surface roughness characteristics of blast-cleaned steel substrates - Part 5: Replica tape method
*GB/T 18570.3-2005 Preparation of steel substrates before application of paints and related products—Tests for the assessment of surface cleanliness—Part3:Assessment of dust on steel surface prepared for painting(pressure-sensitive tape method)
*GB/T 18570.9-2005 Preparation of steel substrates before application of paints and related products—Tests for the assessment of surface cleanliness—Part8: Field method for the conductometric determination of water-soluble salts
*GB/T 21782.1-2008 Coating powders—Part 1:Determination of particle size distribution by sieving
*GB/T 21782.7-2008 Coating powders - Part 7:Determination of loss of mass on stoving
*JB/T 6570-2007 Conventional abrasive-Testing method for magnetic material
*SY/T 0315-97
*SY/T 0407-2012 Specification of Steel Surface Preparation Before Application of Paint
*SY/T 0457-2019 Technical specification of liquid epoxy internal coating for steel pipeline
*SY/T 4078-2014
SY/T 0442-2018 is referred in:
*GB/T 50393-2017 Technical standard for anti一corrosion engineering of steel petroleum storage tanks
Code of China
Standard
SY/T 0442-2018   Technical standard for internal fusion-bonded epoxy coating of steel pipe (English Version)
Standard No.SY/T 0442-2018
Statusvalid
LanguageEnglish
File FormatPDF
Word Count20000 words
Price(USD)500.0
Implemented on2019-3-1
Deliveryvia email in 1 business day
Detail of SY/T 0442-2018
Standard No.
SY/T 0442-2018
English Name
Technical standard for internal fusion-bonded epoxy coating of steel pipe
Chinese Name
钢质管道熔结环氧粉末内防腐层技术标准
Chinese Classification
Professional Classification
SY
ICS Classification
Issued by
NEA
Issued on
2018-10-29
Implemented on
2019-3-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
SY/T 0442-2010 Technical Standard for Internal Fusion Bonded Epoxy Coating of Steel Pipe
Language
English
File Format
PDF
Word Count
20000 words
Price(USD)
500.0
Keywords
SY/T 0442-2018, SY 0442-2018, SYT 0442-2018, SY/T0442-2018, SY/T 0442, SY/T0442, SY0442-2018, SY 0442, SY0442, SYT0442-2018, SYT 0442, SYT0442
Introduction of SY/T 0442-2018
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. This standard is a revision of the SY/T 0442-2010 Technical standard for internal fusion bonded epoxy coating of steel pipe according to Notice of the national energy administration on issuing the development (revision) plan of the professional standards in energy sector in 2016 (GUONENGKEJI [2016] No.238) (planned number of energy 20160197). During the revision process of this standard, the preparation team had conducted extensive investigations and summarized the domestic practical experience in the application of internal fusion-bonded epoxy coating for many years. This standard was formed by revising SY/T 0442-2010 on the basis of analysis, research and experimental verification, referring to relevant foreign standards. This standard comprises of 9 chapters and 5 annexes. The main technical contents include: generals, fabric of internal coating, materials, coating application, quality inspection, repair and re-coating, marks, storage and transportation, field joint coating and completion documents. The following technical contents have been made with respect to SY/T 0442-2010: 1 The performance requirements for epoxy powder and coatings are revised (see 3.2.3). 2 The requirements for procedure qualification trial are revised (see 4.1). 3 The requirements for coating application are revised (see 4.2). 4 The requirements for quality inspection are revised (see Clause 5). 5 The annex of cathodic disbonding resistance test method for anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. 6 The annex of test method for porosity of anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. 7 The annex of adhesion test method for anti-corrosion coating is deleted and replaced by the test method specified in SY/T 0315. The National Energy Administration is in charge of the administration of this standard; the Standardization Committee on Petroleum Engineering is responsible for routine management; CNPC Engineering Technology R&D Company Limited is responsible for the explanation of specific technical contents. In the process of execution of this standard, all relevant organizations are kindly requested to, if found that this standard needs to be modified and supplemented, send opinions and suggestions to CNPC Engineering Technology R&D Company Limited (address: No.40, Jintang Highway, Tanggu, Binhai New Area, Tianjin City; post code: 300451), through combining engineering practices and carefully summarizing experience as well as accumulating documents. Contents 1 Generals 1 2 Fabric of internal epoxy coating 2 3 Materials 3 3.1 Steel pipe 3 3.2 Epoxy powder 3 4 Coating application 6 4.1 Procedure qualification trial 6 4.2 Coating application 7 5 Quality inspection 9 6 Repair and re-coating 11 6.1 Repair 11 6.2 Re-coating 11 7 Marks, storage and transportation 12 8 Field joint coating 13 9 Completion documents 14 Annex A Test method for curing time of epoxy powder 15 Annex B Test method for thermal characteristics of epoxy powder and coating 17 Annex C Test method for flexibility of coating 20 Annex D Test method for impact resistance of coating 22 Annex E Test method for autoclave 24 Explanation of wording in this standard 26 List of quoted standards 27 1 Generals 1.0.1 For the purpose of regulating the design, production and inspection of internal fusion-bonded epoxy coating, this standard is specially formulated. 1.0.2 This standard is applicable to the design, production and inspection of internal fusion-bonded epoxy coating of steel pipe transporting various oil products, natural gas and oil-gas field production water with operating temperature not exceeding 80℃. When the operating temperature exceeds 80℃, the applicability evaluation at the corresponding operating temperature shall be conducted. 1.0.3 The design, production and inspection of internal fusion-bonded epoxy coating of steel pipe shall meet the requirements of this standard, and the current relevant standards of the nation.   2 Fabric of internal epoxy coating 2.0.1 The internal epoxy coating should have fabric of one-time film formation. 2.0.2 The grade and thickness of the internal epoxy coating shall be selected according to factors such as medium corrosion, operating temperature and pressure. The minimum thickness shall meet the requirements of Table 2.0.2. Table 2.0.2 Minimum thickness of internal epoxy coating Coating grade Minimum thickness (μm) Ordinary grade ≥ 300 Reinforced grade ≥ 500   3 Materials 3.1 Steel pipe 3.1.1 The steel pipe prepared for coating application shall meet the requirements of current relevant standards of the nation or industry or ordering conditions. 3.1.2 The steel pipe manufacturer shall provide the quality certificate and certificate of approval of the steel pipe. 3.1.3 The coating factory shall inspect the appearance of steel pipes piece by piece, and the appearance shall meet the requirements of current standards of the nation or industry related to steel pipe or ordering conditions. 3.2 Epoxy powder 3.2.1 Appropriate epoxy powder shall be selected according to the characteristics of the transporting medium and construction requirements of the pipeline. 3.2.2 The epoxy powder shall have relevant technical documents like product specification, end-of-manufacturing certificate, quality certificate, end-of-manufacturing inspection report and safety data sheet provided by the manufacturer to prove that the epoxy powder meets the requirements of 3.2.3. At the time of delivery, the following contents shall at least be clearly marked on the outer package: 1) Manufacturer name and address. 2) Product name and model. 3) Production date and batch number. 4) Storage temperature and humidity. 5) Validity period, etc. 3.2.3 For each grade (type) of epoxy powder, the epoxy powder manufacturer shall provide the performance inspection report of epoxy powder and laboratory anti-corrosion coating meeting the requirements of Tables 3.2.3-1 and 3.2.3-2, and the report shall be issued by the inspection institution that has passed the national metrology certification. 3.2.4 Epoxy powder shall be sealed and kept dry and clean during shipment and storage. The coating factory shall store the epoxy powder in accordance with the temperature and humidity conditions recommended by the epoxy powder manufacturer. Table 3.2.3-1 Performance of epoxy powder No. Test item Quality index Test method 1 Appearance Uniform color, no agglomeration Visual inspection 2 Curing time (min) Complying with the value ±20% given by the powder manufacturer Annex A 3 Thermal characteristics ΔH (J/g) ≥ 45 Annex B Tg3 (℃) ≥98 and above the operating temperature of 40℃ 4 Gelatination time (s) Complying with the value ±20% given by the powder manufacturer GB/T 6554 5 Non-volatile-matter content (105℃) (%) ≥ 99.4 GB/T 6554 6 Mass loss during stoving (230℃, 5 min) (%) ≤1.0 GB/T 21782.7 7 Particle size distribution (%) 150 μm oversize powder ≤3.0 250 μm oversize powder ≤0.2 GB/T 21782.1 8 Density (g/cm3) 1.3~1.5 GB/T 4472 9 Content of magnetic material (%) ≤0.002 JB/T 6570 Table 3.2.3-2 Performance of laboratory epoxy powder coating No. Test item Quality index Test method 1 Appearance Flat, uniform color, no bubbles, no cracking or shrinkage cavity; slight orange peel pattern is allowed. Visual inspection 2 Thermal characteristics, |△Tg|(℃) ≤5 and in accordance with the characteristics given by the powder manufacturer Annex B 3 Cathodic disbonding (65℃, -1.5V, 48h or 65℃, -3.5V, 24h) (mm) ≤5 SY/T 0315 4 Bonding surface porosity (grade) 1~3 SY/T 0315 5 Section porosity (grade) 1~3 SY/T 0315 6 3° bending resistance (-30℃) No crack Annex C 7 Impact resistance (8J) No leakage point Annex D 8 Adhesion (95℃, 24h) (grade) 1~2 SY/T 0315 9 Adhesion with pull-off method (MPa) ≥ 20 GB/T 5210 10 Abrasion resistance (1kg/1,000r, CS-17 wheel) (mg) ≤35 GB/T 1768 11 Electric strength (MV/m) ≥30 GB/T 1408.1 12 Volume resistivity (Ω·m) ≥1×1013 GB/T 1410 13 Water absorption (80℃, 28d) (%) ≤15 GB/T 1034 14 Hot water soaking resistance (Tmax, 28d) Adhesion 1~2 SY/T 0315 Adhesion with pull-off method (MPa) ≥ 20 GB/T 5210 15 Resistance to salt spray (fog) (1,000h) No bubble, cracking or rust in the anti-corrosion coating GB/T 1771 16 Chemical resistance 10%HCl (90d at normal temperature) 3%NaCl (90d at normal temperature) 10%H2SO4 (90d at normal temperature) 10%NaOH (90d at normal temperature) No bubble, cracking, softening or peeling SY/T 0315 Crude oil (80℃, 90d) Oilfield sewage (80℃, 90d) Gasoline (90d at normal temperature) Kerosene (90d at normal temperature) Diesel (90d at normal temperature) No bubble, cracking, softening or peeling SY/T 0315 17 High temperature and pressure resistance test (80℃, 6.9MPa, 168h) No bubble, cracking, softening or peeling Annex E Notes: 1 Laboratory specimens, the thickness of anti-corrosion coating is 300μm~500μm. 2 Film sample used for water absorption test, the thickness should be 500μm±50μm. 3 The test medium and test temperature should be determined according to the working conditions for the corrosion test of chemical medium. 4 Additional test may also be determined according to the working conditions in high temperature and high pressure test conditions. 3.2.5 Before coating application, the epoxy powder used for the first time shall be inspected comprehensively according to corresponding items specified in Tables 3.2.3-1 and 3.2.3-2 of this standard, and the performance shall meet the specified requirements. Then, each batch of epoxy powder (no more than 30t) shall be sampled at least once for inspection. The performance of epoxy powder and its anti-corrosion coating shall be tested according to Items 2, 3, 4, 5, 6, 7, 8, 9 and 10 in Tables 3.2.3-1 and 3.2.3-2 of this standard, and the results shall meet the specified requirements.  4 Coating application 4.1 Procedure qualification trial 4.1.1 Prior to formal coating, the pre-procedure and inspection and trial plan (ITP) for the coating procedure of internal epoxy coating shall be prepared, and coating and inspection tests shall be conducted to confirm the coating quality and form the internal coating which shall meet the required application procedure specification (APS). 4.1.2 The APS shall be prepared according to this standard and engineering requirements, coating parameters recommended by the epoxy powder manufacturer and coating production line conditions. The contents shall cover all links of coating application and control of procedure parameters, and shall at least include the following main contents: 1 Complete information of raw materials, including data sheet of materials, recommended coating procedure and quality control requirements. 2 Surface treatment method and control requirements. 3 Steel pipe heating mode and temperature control requirements. 4 Coating procedure. 5 Inspection and test plan (including inspection contents, test methods, inspection frequency and control requirements). 6 Repair method for defect. 7 Marking regulations. 4.1.3 Coating shall be carried out in accordance with the pre-regulation of application procedure, and the steel pipe, coating production line and epoxy powder used shall be the same as those used in pipeline engineering. The appearance, thickness and leakage point of the steel pipe with internal epoxy coating coated in the procedure qualification trial (PQT) shall be inspected according to the performance items specified in Table 4.1.3, and the results shall meet the requirements. 4.1.4 When the steel pipe specification, coating line, raw material manufacturer or model change, the PQT shall be conducted again.
Contents of SY/T 0442-2018
1 Generals 2 Fabric of internal epoxy coating 3 Materials 3.1 Steel pipe 3.2 Epoxy powder 4 Coating application 4.1 Procedure qualification trial 4.2 Coating application 5 Quality inspection 6 Repair and re-coating 6.1 Repair 6.2 Re-coating 7 Marks, storage and transportation 8 Field joint coating 9 Completion documents Annex A Test method for curing time of epoxy powder Annex B Test method for thermal characteristics of epoxy powder and coating Annex C Test method for flexibility of coating Annex D Test method for impact resistance of coating Annex E Test method for autoclave Explanation of wording in this standard List of quoted standards
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Keywords:
SY/T 0442-2018, SY 0442-2018, SYT 0442-2018, SY/T0442-2018, SY/T 0442, SY/T0442, SY0442-2018, SY 0442, SY0442, SYT0442-2018, SYT 0442, SYT0442