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ICS 83.140.30 G 33 National Standard of the People’s Republic of China GB/T 18742.2-2017 Replaces GB/T 18742.2-2002 Polypropylene piping systems for hot and cold water installations Part 2: Pipes 冷热水用聚丙烯管道系统 第2部分: 管材 (ISO 15874-2: 2013, Plastics Piping Systems for Hot And Cold Water Installations — Polypropylene (PP)—Part 2: Pipes, MOD) (English Translation) Issue date: 2017-10-14 Implementation date: 2018-05-05 Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People’s Republic of China Content Foreword i 1 Scope 1 2 Normative References 1 3 Terms and Definitions, Symbols and Abbreviations 2 4 Materials 2 5 Product Classification 3 6 Selection of S Value of Pipe Series 3 7 Requirements 3 8 Experiment Method 10 9 Testing Regulations 13 10 Signs, Packaging, Transport, Storage 16 Annex A (Informative) Structural Changes of This Standard In Comparison With ISO 15874-2:2013 18 Annex B (Informative) Technical Differences Between this Part and ISO 15874-2:2013 and Their Reasons 20 Annex C (Informative) Relationship Between Tube Series S and Maximum Allowable Working Pressure (20°C, 50 Years) 23 Annex D (Informative) System Suitability 24 Foreword 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. GB/T 18742 Polypropylene Piping System for Hot and Cold Water Installations is divided into 3 parts: - Part 1: General; - Part 2: Pipes; - Part 3: Fittings. This part is part 2 of GB/T 18742. This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 18742.2-2002 "Polypropylene piping system for hot and cold water installations, Part 2: Pipes". Compared with GB/T 18742.2-2002, the main technical changes are as follows: - The polypropylene pipe material is modified to polypropylene mixed material as raw material (see Chapter 1); - Remove "industrial and civilian hot and cold water" and "pipes used in systems that do not use water as a medium" in the scope of application (see Chapter 1 of the 2002 edition); - Add notes on the content of trade (see Chapter 1); - Add and update relevant normative references (see Chapter 2); ——Revision “The raw material used for production of pipes shall be polypropylene pipe material that meets the requirements of GB/T 18742.1” shall be modified to “The polypropylene compound used for the production of pipe materials shall meet the requirements of Chapters 6 and 7 of GB/T 18742.1-2017. (See Chapter 4); - In this standard, "PP-H" is modified to "β crystal PP-H"; - Polypropylene mixed ingredients added to the pipe to increase the β-crystal PP-RCT pipe (see 5.1); ——The S6.3 series is added to the pipes according to the pipe series, and the “Relationship between Annex B pipe series S and nominal pressure PN” is revised to “The relationship between Annex C pipe series S and the maximum allowable working pressure (20°C, 50 years) "(see 5.2, Annex C); - Recalculate the selection of tube series S values and increase the choice of beta crystal PP-RCT tube series S (see Chapter 6); - Re-explanate pipe appearance requirements (see 7.2); - Increase the total wall thickness requirements of the barrier layer and the adhesive layer with a barrier layer (see 7.3.2); - Remove the size requirement for "nominal outside diameter dn 12 mm" (see 7.4.2 of the 2002 edition); - Expand the nominal outside diameter to dn 200 mm (see 7.3.2); - Increase the nominal wall thickness of the pipe series S6.3 and indicate that the pipe series S6.3 applies only to the β-crystalline PP-RCT pipe (see 7.3.2); - Increase allowable deviation of wall thickness (see 7.3.4); - Separately list the hydrostatic strength of the pipe, modify some of the hydrostatic stress valuesand increase the hydrostatic strength of the beta crystal PP-RCT pipe (see 7.4); - Increase the physical and chemical performance requirements of β-crystalline PP-RCT (see 7.5); - Increase ash content, melting temperature, oxidation induction time, oxidation induction time after 95°C/1 000 h hydrostatic test, pigment dispersion, light transmittance, oxygen permeability requirements (see 7.5); - Amend the requirements for the qualified determination of the simply supported beam impact test (see 7.5); - Modify the melt mass-flow rate and the change rate of the corresponding polypropylene compounding (see 7.5); - Remove the requirement of opaqueness, place it in Table 8 of this part and modify it to light transmittance (see 7.5); - Add note to "System suitability of mechanically connected pipes and fittings" (see 7.7.1); - Recalculate the test pressure value of the internal pressure test and increase the internal pressure test requirements for the beta crystal PP-RCT (see 7.7.2); - The "prediction method for prestressing" is deleted and "prestressing" is placed in Table 10 (see 7.7.3); - Increase pre-stress of beta-form PP-RCT (see 7.7.8); - Remove Annex A of GB/T 18742.2-2002 (see Annex A of the 2002 edition); - Add and modify test methods (see Chapter 8); - Add inspection classification (see 9.1); - Modify group batch and grouping requirements (see 9.2.1, 9.2.2); - Increase the requirements for stereotyped inspection projects (see 9.3); - Increase the factory inspection project requirements, and explain the hydrostatic test of beta-form PP-H, PP-B, PP-R, and β-crystal PP-RCT (see 9.4.1); - Revise a sampling plan for normal inspection. The qualified quality level 6.5 is changed to the acceptance quality limit (AQL) 4.0 and the "batch range" is added (see 9.4.2). - Increase control point inspection requirements (see 9.5); - Increase type inspection project requirements (see 9.6.2); - Modify type inspection time requirements (see 9.6.3); - Amend "unqualified batch" to "unqualified batch (or product)" (see 9.7); - Modify the content of the product name in the mark is modified (see 10.1.1); - Add signs to the content of the production lot, non-exposed pipes, and barriers with a barrier layer (see 10.1.1); - Remove clauses that should not mark the PN value to prevent confusion during use (see 10.1.3 of the 2002 edition); - Remove the requirement that "the quality of each package is generally not more than 25 kg, and can also be negotiated and determined according to user requirements" (see 10.2 of the 2002 edition); - Add informative Annex "This part of the structure changes compared with ISO 15874-2:2013" (see Annex A); - Add informative Annex "Technical Differences between this Part and ISO 15874-2:2013 and their causes" (see Annex B); - Add Informative Annex "System Applicability" (see Annex D). This standard uses the redrafted method to amend ISO 15874-2:2013 "Polypropylene Piping Systems for Hot and Cold Water Equipment - Part 2: Pipes" (in English). This part has more structural adjustments than ISO 15874-2:2013. A list of the comparison between the chapter number of this standard and the chapter number of ISO 15874-2:2013 is listed in Annex A. There are technical differences between this part and ISO 15874-2:2013, and a list of the corresponding technical differences and their causes are given in Annex 8. This standard uses the currently valid national standards and replaces the references in ISO 15874-2:2013. Please note that some of the contents of this document may involve patents. The issuing agency of this document does not assume responsibility for identifying these patents. This part was proposed by China National Light Industry Council and is under the jurisdiction of the National Technical Committee 15 on Plastic of Standardization Administration of China (SAC/TC 48). The previous version of the standards replaced by this standard is: - GB/T 18742.2-2002. Polypropylene Piping System for Hot and Cold Water Installations Part 2: Pipes 1 Scope This part of GB/T 18742 specifies the definition, symbols and abbreviations, materials, product classifications, tube series of polypropylene cross-standards (hereinafter referred to as “pipes”) made of polypropylene mixed ingredients and extruded. S value selection, requirements, test methods, inspection rules and signs, packaging, transport and storage. This part applies together with GB/T 18742.1, GB/T 18742.3 for hot and cold water piping systems in buildings, including drinking water and heating piping systems. Note: The purchaser has the responsibility to properly select this product according to its specific application requirements in conjunction with relevant regulations, standards or regulatory requirements. This standard does not apply to fire suppression systems. 2 Normative References The provisions of the following documents, through reference in this text, constitute the provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition referred to apply. GB/T 2828.1—2012 Count Sampling Inspection Procedures Part 1: Batch Inspection Sampling Plans Based on AQL (ISO 2859-1:1999, IDT) GB/T 2918—1998 Standard Environment for Conditioning and Testing Plastic Specimen (Idt ISO 291:1997) GB/T 3682-2000 Determination of Mass Flow Rate and Melt Volume Flow Rate of Thermoplastic Melts (Idt ISO 1133:1997) GB/T 6111—2003 Test Method For Internal Pressure Resistance Of Thermoplastic Pipes For Fluid Transport (ISO 1167:1996, IDT) GB/T 6671-2001 Determination Of Longitudinal Shrinkage Of Thermoplastic Pipes (Eqv ISO 2505:1994) GB/T 8806—2008 Plastics Piping Systems Measurement Of Dimensions Of Plastic Parts (ISO 3126:2005, IDT) GB/T 9345.1-2008 Plastics Determination Of Ash Part 1: General Methods (ISO 3451-1:1997, IDT) GB/T 10798-2001 General Wall Thickness Table For Thermoplastic Pipes (Idt ISO 4065:1996) GB/T 17219 Safety Evaluation Standard For Drinking Water Distribution Equipment And Protective Materials For Drinking Water GB/T 18251-2000 Test Method For Dispersion Of Pigments And Carbon Black In Polyolefin Pipes, Fittings And Mixes GB/T 18742.1-2017 Polypropylene Piping System for Hot and Cold Water - Part 1: General (ISO 15874-1:2013, MOD) GB/T 18742.3—2017 Polypropylene Piping System For Hot and Cold Water—Part 3: Pipe Fittings (ISO 15874-3:2013, MOD) GB/T 18743—2002 Thermoplastics Pipes For Fluid Transport Simple Beam Impact Test Methods (Eqv ISO 9854-1 To 9854-2:1994) GB/T 19466.3-2004 Plastics - Differential Scanning Calorimetry (DSC) - Part 3: Determination of Melting And Crystallization Temperature And Enthalpy (ISO 11357-3:1999, IDT) GB/T 19466.6-2009 Plastics - Differential Scanning Calorimetry (DSC) - Part 6: Determination Of Oxidation Induction Time (Isothermal OIT) And Oxidation Induction Temperature (Dynamic OIT) (ISO 11357-6:2008, MOD) GB/T 19473.2—2004 Polybutylene (PB) Piping System for Hot And Cold Water Part 2: Pipes GB/T 19993-2005 Thermoplastics Piping System For Hot And Cold Water Hot-Circulation Test Method for Pipe Fittings System GB/T 21300-2007 Plastics Pipes And Fittings Determination Of Opacity (ISO 7886:2005, IDT) ISO 17455:2005 Plastics Piping Systems Determination Of Oxygen Barrier Properties Of Multilayer Pipes (Plastics Piping Systems—Muhilayer Pipes—Determination Of The oxygen permeability of the barrier pipe) 3 Terms and Definitions, Symbols and Abbreviations For the purpose of this standard, the terms and definitions, symbols and abbreviations defined in GB/T l8742.1-2017 apply. 4 Materials Polypropylene mixed ingredients for the production of pipes should meet the requirements of Chapters 6 and 7 of GB/T 18742.1-2017. 5 Product Classification 5.1 Pipes are divided into β-type PP-H, PP-B, PP-R, and β-crystal PP-RCT pipes according to the polypropylene mixture. 5.2 Pipes are divided into S6.3, S5, S4, S3.2, S2.5, and S2 according to the pipe series. The relationship between the series S and the maximum allowable working pressure (20 °C, 50 years) is shown in Annex C. 6 Selection of S Value of Pipe Series According to different materials of pipes, the corresponding S values are determined by condition levels and design pressure, see Table 1, Table 2, Table 3, Table 4. For other pressure specifications, the corresponding S value shall be decided according to the agreement between the supply and demand sides, and the designed lifetime shall meet the requirements of 50 years. 7 Requirements 7.1 Color Generally gray, other colors can be negotiated between the supply and demand parties. 7.2 Appearance The surface color of the pipe should be uniform and there should be no obvious color difference. The inner and outer surfaces of the pipe should be smooth and flat. There should be no depressions, bubbles, impurities, and other surface defects that affect the product's performance. The end face of the pipe should be cut flat and perpendicular to the axis. 7.3 Specifications and dimensions 7.3.1 Pipe specification pipe series S, Nominal outside diameter dn × Nominal wall thickness en. Example: Tube series S5, nominal diameter 32 mm, nominal wall thickness 2.9 mm Expressed as S5 dn32×en2.9 7.3.2 The nominal outside diameter, the average outside diameter of the pipe, and the minimum wall thickness corresponding to the pipe series s (excluding the wall thickness of the barrier layer and the adhesive layer) are shown in Table 5.The total wall thickness of the barrier layer and the adhesive layer should not exceed 0.4 mm. Table 5 Pipe Series and Specifications Size In Millimeters Nominal outside diameter dn Average outside diameter Nominal wall thickness en dem,min dem,max Tube series S6.3a S5 S4 S3.2 S2.5 S2 16 16.0 16.3 — — 2.0 2.2 2.7 3.3 20 20.0 20.3 — 2.0 2.3 2.8 3.4 4.1 25 25.0 25.3 2.0 2.3 2.8 3 5 4.2 5.1 32 32.0 32.3 2.4 2.9 3.6 4.4 5.4 6.5 40 40.0 40.4 3.0 3.7 4.5 5.5 6.7 8.1 50 50.0 50.5 3.7 4.6 5.6 6.9 8.3 10 1 63 63.0 63.6 4.7 5.8 7.1 8.6 10.5 12 7 75 75.0 75.7 5.6 6.8 8.4 10.3 12.5 15.1 90 90.0 90.9 6.7 8.2 10.1 12.3 15.0 18.1 110 110.0 111.0 8.1 10.0 12.3 15.1 18.3 22.1 125 125.0 126.2 9.2 11.4 14.0 17.1 20.8 25.1 140 140.0 141.3 10.3 12.7 15.7 19.2 23.3 28.1 160 160.0 161.5 11.8 14.6 17.9 21.9 26.6 32,1 180 180.0 181.7 13.3 16.4 20.1 24.6 29.0 36 1 200 200.0 201.8 14.7 18.2 22.4 27.4 33.2 40.1 a Only applicable to beta crystal PP-RCT tubing. 7.3.3 The length of the pipe is generally 4 m or 6 m, which can also be agreed upon by the supply and demand sides. Pipe length should not have negative deviations. 7.3.4 The allowable deviation of wall thickness of the same standard of the pipe shall meet the requirements of Table 6. Foreword i 1 Scope 2 Normative References 3 Terms and Definitions, Symbols and Abbreviations 4 Materials 5 Product Classification 6 Selection of S Value of Pipe Series 7 Requirements 8 Experiment Method 9 Testing Regulations 10 Signs, Packaging, Transport, Storage Annex A (Informative) Structural Changes of This Standard In Comparison With ISO 15874-2: Annex B (Informative) Technical Differences Between this Part and ISO 15874-2:2013 and Their Reasons Annex C (Informative) Relationship Between Tube Series S and Maximum Allowable Working Pressure (20°C, 50 Years) Annex D (Informative) System Suitability ICS 83.140.30 G 33 中华人民共和国国家标准 GB/T 18742.2—2017 代替GB/T 18742.2—2002 冷热水用聚丙烯管道系统 第2部分:管材 Polypropylene(PP)piping systems for hot and cold water installations— Part 2:Pipes (ISO 15874-2:2013,Plastics piping systems for hot and cold water installations—Polypropylene(PP)—Part 2:Pipes,MOD) 2017-10-14发布 2018-05-01实施 中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会 发布 前言 GB/T 18742《冷热水用聚丙烯管道系统》分为3个部分: ——第1部分:总则; ——第2部分:管材; ——第3部分:管件。 本部分为GB/T 18742的第2部分。 本部分按照GB/T 1.1—2009给出的规则起草。 本部分代替GB/T 18742.2—2002《冷热水用聚丙烯管道系统 第2部分:管材》,与GB/T 18742.2—2002相比,主要技术变化如下: ——将聚丙烯管材料为原料修改为聚丙烯混配料为原料(见第1章); ——删除了适用范围中的“工业及民用冷热水”及“不使用水作为介质的系统所用的管材”(见2002年版的第1章); ——增加了贸易性内容的注(见第1章); ——增加和更新了相关的规范性引用文件(见第2章); ——将“生产管材所用原材料应是符合GB/T 18742.1要求的聚丙烯管材料”修改为“生产管材用聚丙烯混配料应符合GB/T 18742.1—2017的第6章、第7章的要求(见第4章); ——本部分中将“PP-H”均修改为“β晶型PP-H”; ——管材按聚丙烯混配料分增加了β晶型PP-RCT管材(见5.1); ——管材按管系列分增加了S6.3系列,将“附录B管系列S与公称压力PN的关系”修改为“附录C管系列S与最大允许工作压力的关系(20℃,50年)”(见5.2、附录C); ——重新计算了管系列S值的选择并增加了β晶型PP-RCT管材管系列S的选择(见第6章); ——对管材外观要求重新进行了表述(见7.2); ——增加了带阻隔层管材的阻隔层和黏接层总壁厚要求(见7.3.2); ——删除了“公称外径dn 12 mm”的尺寸要求(见2002年版的7.4.2); ——将公称外径尺寸扩大到dn 200 mm(见7.3.2); ——增加了管系列S6.3的公称壁厚并注明了管系列S6.3仅适用于β晶型PP-RCT管材的说明(见7.3.2); ——增加了壁厚的允许偏差(见7.3.4); ——单独列出管材的静液压强度,修改了部分静液压应力值并增加了β晶型PP-RCT管材静液压强度(见7.4); ——增加了β晶型PP-RCT管材的物理和化学性能要求(见7.5); ——增加了灰分、熔融温度、氧化诱导时间、95℃/1 000 h静液压试验后的氧化诱导时间、颜料分散、透光率、透氧率的要求(见7.5); ——修改了简支梁冲击试验合格判定要求(见7.5); ——修改了熔体质量流动速率与对应聚丙烯混配料的变化率要求(见7.5); ——删除了不透光性要求,放入本部分表8中并修改为透光率(见7.5); ——增加了“采用机械连接的管材与管件的系统适用性”的注(见7.7.1); ——重新计算内压试验的试验压力值并增加了β晶型PP-RCT管材的内压试验要求(见7.7.2); ——删除了“预应力的推算方法”,将“预应力”放入表10中(见7.7.3); ——增加了β晶型PP-RCT的预应力(见7.7.8); ——删除了GB/T 18742.2—2002中的附录A(见2002年版的附录A); ——增加和修改了试验方法(见第8章); ——增加了检验分类(见9.1); ——修改了组批和分组要求(见9.2.1、9.2.2); ——增加了定型检验项目要求(见9.3); ——增加了出厂检验项目要求,对β晶型PP-H、PP-B、PP-R、β晶型PP-RCT管材的静液压试验做了说明(见9.4.1); ——修改了正常检验一次抽样方案,合格质量水平6.5改为接收质量限(AQL)4.0,增加了“批量范围”(见9.4.2); ——增加了控制点检验要求(见9.5); ——增加了型式检验项目要求(见9.6.2); ——修改了型式检验时间要求(见9.6.3); ——将“不合格批”修改为“不合格批(或产品)”(见9.7); ——修改了标志中产品名称的内容(见10.1.1); ——标志内容中增加了生产批号、非明装管材、带阻隔层管材的标志要求(见10.1.1); ——删除了为防止使用过程中出现混乱,不应标志PN值的条款(见2002年版的10.1.3); ——删除了“每个包装质量一般不大于25 kg,也可根据用户要求协商确定”的要求(见2002年版的10.2); ——增加了资料性附录“本部分与ISO 15874-2:2013相比的结构变化情况”(见附录A); ——增加了资料性附录“本部分与ISO 15874-2:2013的技术差异及其原因”(见附录B); ——增加了资料性附录“系统适用性”(见附录D)。 本部分使用重新起草法修改采用ISO 15874-2:2013《冷热水设备用塑料管道系统 聚丙烯 第2部分:管材》(英文版)。 本部分与ISO 15874-2:2013相比在结构上有较多调整。附录A中列出了本部分章条编号与ISO 15874-2:2013的章条编号的对照一览表。 本部分与ISO 15874-2:2013相比存在技术性差异,附录8中给出了相应技术性差异及其原因的一览表。 本部分采用现行有效的国家标准,替代了ISO 15874-2:2013中的引用文件。 请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别这些专利的责任。 本部分由中国轻工业联合会提出。 本部分由全国塑料制品标准化技术委员会(SAC/TC 48)归口。 本部分主要起草单位:上海白蝶管业科技股份有限公司、浙江伟星新型建材股份有限公司、永高股份有限公司、淄博洁林塑料制管有限公司、成都川路塑胶集团有限公司、日丰企业集团有限公司、爱康企业集团(上海)有限公司、武汉金牛经济发展有限公司、金德管业集团有限公司、国机通用机械科技股份有限公司、河北宝路七星塑业有限公司、北京工商大学、上海天力实业(集团)有限公司。 本部分主要起草人:柴冈、李大治、黄剑、徐红越、朱利平、谢建玲、贾立蓉、李白千、邱强、涂向群、王士良、项爱民、吴文利。 本部分所代替标准的历次版本发布情况为: ——GB/T 18742.2—2002。 冷热水用聚丙烯管道系统 第2部分:管材 1范围 GB/T 18742的本部分规定了以聚丙烯混配料为原料,经挤出成型的圆形横截面的聚丙烯管材(以下简称管材)的定义、符号和缩略语、材料、产品分类、管系列S值的选择、要求、试验方法、检验规则和标志、包装、运输、贮存。 本部分与GB/T 18742.1、GB/T 18742.3一起适用于建筑物内冷热水管道系统,包括饮用水和采暖管道系统等。 注;选购方有责任根据其特定应用需求,结合相关法规、标准或规范要求,恰当选用本产品。 本部分不适用于灭火系统。 2规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。 GB/T 2828.1—2012计数抽样检验程序 第1部分:按接收质量限(AQL)检索的逐批检验抽样计划(ISO 2859-1:1999,IDT) GB/T 2918—1998 塑料试样状态调节和试验的标准环境(idt ISO 291:1997) GB/T 3682—2000热塑性塑料熔体质量流动速率和熔体体积流动速率的测定(idt ISO 1133:1997) GB/T 6111—2003流体输送用热塑性塑料管材耐内压试验方法(ISO 1167:1996,IDT) GB/T 6671—2001热塑性塑料管材 纵向回缩率的测定(eqv ISO 2505:1994) GB/T 8806—2008塑料管道系统 塑料部件 尺寸的测量(ISO 3126:2005,IDT) GB/T 9345.1—2008塑料 灰分的测定 第1部分:通用方法(ISO 3451-1:1997,IDT) GB/T 10798—2001热塑性塑料管材通用壁厚表(idt ISO 4065:1996) GB/T 15820—1995聚乙烯压力管材与管件连接的耐拉拔试验 GB/T 17219生活饮用水输配水设备及防护材料的安全性评价标准 GB/T 18251—2000聚烯烃管材、管件和混配料中颜料和炭黑分散的测定方法 GB/T 18742.1—2017冷热水用聚丙烯管道系统 第1部分:总则(ISO 15874-1:2013,MOD) GB/T 18742.3—2017冷热水用聚丙烯管道系统 第3部分:管件(ISO 15874-3:2013,MOD) GB/T 18743—2002流体输送用热塑性塑料管材 简支梁冲击试验方法(eqv ISO 9854-1~9854-2:1994) GB/T 19466.3—2004塑料 差示扫描量热法(DSC) 第3部分:熔融和结晶温度及热焓的测定(ISO 11357-3:1999,IDT) GB/T 19466.6—2009塑料 差示扫描量热法(DSC) 第6部分:氧化诱导时间(等温OIT)和氧化诱导温度(动态OIT)的测定(ISO 11357-6:2008,MOD) GB/T 19473.2—2004冷热水用聚丁烯(PB)管道系统 第2部分:管材 GB/T 19993—2005冷热水用热塑性塑料管道系统 管材管件组合系统热循环试验方法 GB/T 21300—2007塑料管材和管件 不透光性的测定(ISO 7886:2005,IDT) ISO 17455:2005 塑料管道系统 多层管 阻隔层氧气渗透性能的测定(Plastics piping systems—Muhilayer pipes—Determination of the oxygen permeability of the barrier pipe) 3术语和定义、符号和缩略语 GB/T l8742.1—2017界定的术语和定义、符号和缩略语适用于本文件。 4材料 生产管材用聚丙烯混配料应符合GB/T 18742.1—2017的第6章、第7章的要求。 5产品分类 5.1管材按聚丙烯混配料分为β晶型PP-H、PP-B、PP-R、β晶型PP-RCT管材。 5.2管材按管系列分为S6.3、S5、S4、S3.2、S2.5、S2。管系列S与最大允许工作压力的关系(20℃,50年)参见附录C。 6管系列S值的选择 管材按不同的材料、使用条件级别和设计压力选择对应的S值,见表1、表2、表3、表4。其他压力规格,按供需双方商定选择对应S值,使用寿命设计应满足50年的要求。 表1 β晶型PP-H管管系列S的选择 设计压力 MPa 管系列S 级别1 σD=2.88 MPa 级别2 σD=1.99 MPa 级别4 σD=3.23 MPa 级别5 σD=1.82 MPa 0.4 5 5 5 4 0.6 4 3.2 5 2.5 0.8 3.2 2.5 4 2 1.0 2.5 2 3.2 表2 PP-B管管系列S的选择 设计压力 MPa 管系列S 级别1 σD=1.66 MPa 级别2 σD=1.19 MPa 级别4 σD=1.94 MPa 级别5 σD=1.19 MPa 0.4 4 2.5 4 2.5 0.6 2.5 2 3.2 2 0.8 2 — 2 — 1.0 — — 2 — 表3 PP-R管管系列S的选择 设计压力 MPa 管系列S 级别1 σD=3.02 MPa 级别2 σD=2.12 MPa 级别4 σD=3.29 MPa 级别5 σD=1.89 MPa 0.4 5 5 5 4 0.6 5 3.2 5 3.2 0.8 3.2 2.5 4 2 1.0 2.5 2 3.2 表4 β晶型PP-RCT管管系列S的选择 设计压力 MPa 管系列S 级别1 σD=3.64 MPa 级别2 σD=3.40 MPa 级别4 σD=3.67 MPa 级别5 σD=2.92 MPa 0.4 6.3 6.3 6.3 5 0.6 5 5 5 4 0.8 4 4 4 3.2 1.0 3.2 3.2 3.2 2.5 7要求 7.1颜色 一般为灰色,其他颜色可由供需双方协商确定。 7.2外观 管材表面颜色应均匀一致,不应有明显色差。 管材的内外表面应光滑、平整,不应有凹陷、气泡、杂质和其他影响产品性能的表面缺陷。管材端面应切割平整并与轴线垂直。 7.3规格及尺寸 7.3.1管材规格用管系列S、公称外径dn×公称壁厚en表示。 示例:管系列S5、公称外径为32 mm、公称壁厚为2.9 mm 表示为S5 dn32×en2.9 7.3.2管材的公称外径、平均外径以及管系列s对应的最小壁厚(不包括阻隔层和黏接层的壁厚),见表5。阻隔层和黏接层总壁厚应不大于0.4 mm。 表5 管材管系列和规格尺寸 单位为毫米 公称外径 dn 平均外径 公称壁厚 en dem,min dem,max 管系列 S6.3a S5 S4 S3.2 S2.5 S2 16 16.0 16.3 — — 2.0 2.2 2.7 3.3 20 20.0 20.3 — 2.0 2.3 2.8 3.4 4.1 25 25.0 25.3 2.0 2.3 2.8 3 5 4.2 5.1 32 32.0 32.3 2.4 2.9 3.6 4.4 5.4 6.5 40 40.0 40.4 3.0 3.7 4.5 5.5 6.7 8.1 50 50.0 50.5 3.7 4.6 5.6 6.9 8.3 10 1 63 63.0 63.6 4.7 5.8 7.1 8.6 10.5 12 7 75 75.0 75.7 5.6 6.8 8.4 10.3 12.5 15.1 90 90.0 90.9 6.7 8.2 10.1 12.3 15.0 18.1 110 110.0 111.0 8.1 10.0 12.3 15.1 18.3 22.1 125 125.0 126.2 9.2 11.4 14.0 17.1 20.8 25.1 140 140.0 141.3 10.3 12.7 15.7 19.2 23.3 28.1 160 160.0 161.5 11.8 14.6 17.9 21.9 26.6 32,1 180 180.0 181.7 13.3 16.4 20.1 24.6 29.0 36 1 200 200.0 201.8 14.7 18.2 22.4 27.4 33.2 40.1 a 仅适用于β晶型PP-RCT管材。 7.3.3管材的长度一般为4 m或6 m,也可由供需双方商定。管材长度不应有负偏差。 7.3.4管材同一截面壁厚允许偏差应符合表6规定。 表6壁厚的允许偏差 单位为毫米 公称壁厚 en 允许偏差 公称壁厚 en 允许偏差 公称壁厚 en 允许偏差 公称壁厚 en 允许偏差 1.0 PP-B PPR (135±2)℃ β晶型PP-RCT 简支梁 冲击 β晶型PP-H 破损率不大于 试样数量的10% 试验温度 (25±2)℃ 10 GB/T 18743—2002 PP-B (0±2)℃ PP-R β晶型PP-RCT 熔体质量流动速率 ≤0.5 g/10 min且与对应聚丙烯混配料的变化率不超过20% 试验温度砝码质量 230℃ 2.16kg 3 GB/T 3682—2000 静液压状态下热稳定性 无破裂无渗漏 静液压应力: β晶型PP-H PP-B PP-R β晶型PP-RCT 试验温度 试验时间 1.9MPa 1.4MPa 1.9MPa 2.6MPa 110℃ 8 760 h 1 GB/T 6111—2003 透光率a ≤0.2% — 3 GB/T 21300—2007 透氧率b ≤0.1 g/(m3·d) ISO 17455:2005 a仅适用于明装管材。 b仅适用于带阻氧层的管材。 7.6卫生要求 用于输送饮用水的管材应符合GB/T 17219的规定。 7.7系统适用性 7.7.1管材与符合GB/T 18742.3—2017规定的管件连接后进行内压试验和热循环试验。 注:采用机械连接的管材与管件的系统适用性可参见7.7及附录D进行。 7.7.2 内压试验的结果应符合表9的要求。 表9内压试验 管系列 材料 试验压力 MPa 试验温度 ℃ 试验时间 h 试样数量 要求 S6.3 β晶型PP-RCT 0.60 95 1 000 3 无破裂 无渗漏 S5 β晶型PP-H 0.72 PP-B 0.52 PP-R 0.70 β晶型PP-RCT 0.76 S4 β晶型PP-H 0.90 PP-B 0.65 PP-R 0.88 β晶型PP-RCT 0.95 S3.2 β晶型PP-H 1.13 PP-B 0.81 PP-R 1.09 β晶型PP-RCT 1.19 S2.5 β晶型PP-H 1.44 PP-B 1.04 PP-R 1.40 β晶型PP-RCT 1.52 S2 β晶型PP-H 1.80 PP-B 1.30 PP-R 1.75 β晶型PP-RCT 1.90 7.7.3热循环试验的结果应符合表10的要求。 表10热循环试验 材料 最高试验温度 ℃ 最低试验温度 ℃ 试验压力 MPa 循环次数 预应力 MPa 试样数量 要求 β晶型PP-H 95 20 1.0 5 000 3.6 1 无破裂 无渗漏 PP-B 3.0 PP-R 2.4 β晶型PP-RCT 2.7 注:一个循环的时间为30 min,包括15 min最高试验温度和15 min最低试验温度。 8试验方法 8.1试验状态调节 应在管材下线48 h后取样。 除非另有规定,试样应按GB/T 2918—1998规定,在温度为(23±2)℃,相对湿度为(50±10)%条件下进行状态调节,时间不少于24 h,并在此条件下进行试验。 8.2颜色及外观检查 目测。 8.3尺寸测量 8.3.1 平均外径 按GB/T 8806—2008进行测量。应选取距离管材端口100 mm~150 mm处测量,小数点后第二位非零数字进位。 8.3.2壁厚 按GB/T 8806—2008的规定测量壁厚的最大值和最小值,精确到0.1 mm,小数点后第二位非零数字进位。 带阻隔层管材测量壁厚时,在管材的同一横截面上平均切取四段弧状试样,用切片机切取厚度为20 μm的样品并用盖玻片平整盖好,在倍率不低于100倍的显微镜下进行测量,计算四段阻隔层和黏接层的厚度,取平均值为阻隔层和黏接层的壁厚,精确到0.01 mm。 8.3.3长度 按GB/T 8806—2008进行测量,量具精度不低于1 mm。 8.4静液压强度 按GB/T 6111—2003进行试验。试验条件按表7的规定,试样内外的介质均为水,采用A型封头。带阻隔层管材计算试验压力时,计算公式中的最小壁厚应去除阻隔层和黏接层的厚度。 8.5灰分 按GB/T 9345.1—2008方法A进行试验,试验温度为600℃。带阻隔层管材试验前应去除阻隔层和黏接层。 8.6熔融温度 按GB/T 19466.3—2004进行试验。取第2次加热扫描DSC曲线上的峰值温度TPm为熔融温度。带阻隔层管材试验前应去除阻隔层和黏接层。 8.7氧化诱导时间 按GB/T 19466.6—2009进行试验,试验温度为210℃,试验容器为铝皿。带阻隔层管材试验前应去除阻隔层和黏接层。 8.8 95℃/1 000 h静液压试验后的氧化诱导时间 按GB/T 19466.6—2009进行试验,在完成95℃/1 000 h静液压试验后的样品中进行取样,取管材内层进行试验。带阻隔层管材试验前应去除阻隔层和黏接层。 8.9颜料分散 按GB/T 18251—2000进行试验。带阻隔层管材试验前应去除阻隔层和黏接层。 8.10纵向回缩率 按GB/T 6671—2001方法B进行试验。 8.11简支梁冲击 按GB/T 18743—2002进行试验。 8.12熔体质量流动速率 按GB/T 3682—2000进行试验。带阻隔层管材试验前应去除阻隔层和黏接层。 8.13静液压状态下的热稳定性 8.13.1试验条件 按表8规定进行试验,温度允许偏差为110 ℃。试验介质:内部为水,外部为空气。 8.13.2试验方法 按GB/T 6111—2003进行试验,采用A型封头。 8.14透光率 按GB/T 21300—2007进行试验。 8.15透氧率 按ISO 17455:2005进行试验。 8.16卫生要求 按GB/T 17219进行试验。 8.17系统适用性试验 8.17.1 内压试验 试验组件应包括管材和至少两种以上相配套的管件组合而成,试验方法按GB/T 6111—2003进行试验,采用A型封头。试验介质:试样内外均为水。 8.17.2热循环试验 按GB/T 19993—2005进行试验。 9检验规则 9.1检验分类 检验分为定型检验、出厂检验、控制点检验和型式检验。 9.2组批和分组 9.2.1组批 同一原料、同一设备和工艺且连续生产的同一规格管材作为一批,每批数量不超过100 t。如果生产10天仍不足100 t,则以10天产量为一批。 9.2.2分组 按表11规定对管材进行尺寸分组。 表11 管材的尺寸组和公称外径范围 尺寸组 公称外径范围 mm 1 16≤dn≤63 2 63 |
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GB/T 18742.2-2017, GB 18742.2-2017, GBT 18742.2-2017, GB/T18742.2-2017, GB/T 18742.2, GB/T18742.2, GB18742.2-2017, GB 18742.2, GB18742.2, GBT18742.2-2017, GBT 18742.2, GBT18742.2 |