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1、Specification for the ApplicationofTar Urethane (TU ) for theField Joint Coating and Repair of Three Layer Polyethylene Coated Linepipe用于3LPE管材防腐补口的TU涂料应用规范Spencer Coatings Limited,Froghall Terrace,Aberdeen,AB24 3JNTel +44 (0) 1224 788400Fax +44 (0) 1224 648116infospencercoatings.co.ukwww.spencercoa
2、tings.co.ukCONTENTS1.0Scope范围2.0Codes and Standards规范和标准3.0Field Joint Surface Preparation 补口的表面预处理4.0Field Joint Coating 补口涂敷5.03 Layer Coating Repair 3层涂层修补6.0Field Joint Coating 补口涂敷检查7.0Storage and Handling 储存与运输8.0Safety 安全9.0Acothane TU Properties TU性能10 Coating Properties涂层性能1.0Scope 范围 This
3、specification describes the requirements for preparing field joints and damaged areas on 3 Layer polyethylene coated pipes, and the application of Tar Urethane (TU) as an external protective system. Coating application shall comply with the manufacturers recommendations and be in accordance with thi
4、s specification.本规范规定了处理3LPE涂层管上的补口和损坏区域，以及使用TU作为外部防护系统时的要求。涂料施工应按照厂家的建议并应遵照本规范来执行。The coating shall normally consist of one layer of rapid cure TU applied using a wet on wet spray technique or multi-layers of longer pot-life material formulated for brush application.涂层一般包括一层有着快速固化作用的TU涂料，它使用湿喷涂技术或多
5、层耐用涂层通过刷涂涂敷。Suitable coating materials are:涂层材料： Metrotect Acothane TU Spray Grade Metrotect Acothane TU 喷涂 Metrotect Acothane TU Brushing Grade Metrotect Acothane刷涂2.0Codes and Standards 规范和标准SSPC - SP1 (Solvent Cleaning) SSPC - SP1（溶剂清洗）SSPC - AB1 (Mineral Slag and Abrasive) SSPC - AB1（矿渣及研磨剂）ASTM
6、-D4417 (Field Measurement of Surface Profile of Blast Cleaned Surfaces)ASTM-D4417 （现场测量喷砂处理过的表面粗糙度）ISO 8501-1 (Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness).ISO 8501-1（涂料及相关产品涂敷前钢基预处理-目测表面净度）DIN 30671 - 埋地钢管的热固性塑料涂层3.0 F
7、ield Joint Surface Preparation 补口的表面预处理Oil, grease and other contaminants shall be removed from the steel and adjacent polyethylene surfaces by solvent cleaning in accordance with SSPC SP1 prior to abrasive blast cleaning.根据SSPC SP1的规定，在喷砂处理之前，应当用溶剂将附着在钢材及相邻聚乙烯材料表面的油脂及其他污染物清洗掉。Steel and polyethylene
8、 surfaces to receive TU coating shall be abrasive blast cleaned to establish an anchor pattern. The temperature of the substrate shall be a minimum of 3C (5F) above the dew point during surface preparation, coating application and curing. Coating materials shall not be applied when the steel tempera
9、ture is below 0C (32F). Preheating is required if either of these two conditions are not met.应当对将要涂敷Acothane涂层的钢材及聚乙烯材料的表面进行喷砂处理，使其表面呈粗糙状。底材温度应至少在露点以上3C (5F)。在钢材温度低于0C (32F)时，不应使用涂层材料。如无法满足两个条件中任意一条，则需要进行预热处理。The abrasive blast cleaning shall be performed using compressor units equipped with separat
10、ors, filters and drains to ensure that contaminants such as oil and water are not deposited onto the surface to be coated. Burrs, slivers, scabs and weld spatter visible following blasting shall be removed and the area re-blasted. The prepared surface shall be coated prior to any visible deteriorati
11、on of the surface.应采用配备有分离、过滤及排水装置的压缩机组进行喷砂除锈处理，来确保诸如油和水一类的污染物不会沉积在将要进行涂敷的表面上。喷砂之后，应当除掉明显的毛刺、裂片、瑕疵和焊渣并对此处再次喷砂。应在有任何明显的劣化现象出现之前对处理过的表面进行涂敷。Abrasive for blast cleaning shall be clean and dry and free of contaminants. The particle size shall be capable of producing the specified surface profile. Slag a
12、nd mineral abrasives shall meet the requirements of SSPC AB1. Re-circulated abrasives or steel grit may be used if not contaminated with pipe coatings or salts.用于喷砂的研磨料应当清洁干燥且无污染。颗粒的大小应能够形成规定的表面粗糙度。矿渣和矿物研磨料应满足SSPC AB1的要求。如果没有被管材涂料或盐所污染，那么可循环的研磨料或钢砂还可以再次使用。The steel surface shall be blast-cleaned in
13、accordance with ISO 8501-1 Sa2 . Remnants of the first layer of fusion bonded epoxy, or liquid epoxy may remain adjacent to the edge of the polyethylene. The minimum anchor profile on the steel resulting from blast cleaning shall be 75mm (3.0mils). The polyethylene surface shall be roughened by abra
14、sive blast cleaning for a minimum length of 100mm from each cutback area. The polyethylene shall be further abraded with a wire brush or similar implement to achieve a hairy/stringy surface to maximize the surface area and aid adhesion. Residual blast products shall be removed from the cleaned surfa
15、ces by using clean, dry, compressed air. The use of rags to wipe clean the prepared surfaces is prohibited. All surfaces to be coated shall be free from contaminants, including moisture. All areas which are not to be coated shall be protected from abrasive blast cleaning.根据ISO 8501-1 Sa2 ，钢材表面应进行喷砂处理。熔结环氧树脂第一层的残余物或液体环氧树脂可能仍残留在邻近聚乙烯材料的边缘。喷砂清理后钢管的最低锚纹应为75微米（3.0密耳）。为使从每个削减面开始最小长度都是100毫米，应通过喷砂处理的方式对聚乙烯材料的表面进行粗糙化。应使用钢丝刷或者类似的工具对聚乙烯材料进行深度研磨以形成毛状/纤维状的表面，这样做可使表面积最大化并有助
