海洋结构物阳极.doc

COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0041 9 0ISSUED FOR EPIC TENDERPMTDKHTHH06 04 03 REV DESCRIPTIONPREP CHECK DAPPR Client APPR DATE GENERAL SPECIFICATION 总体规格书总体规格书 ANODES FOR OFFSHORE STRUCTURES 海洋结构物阳极海洋结构物阳极 CACT NONE S F993 S004 COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0042 9 TABLE OF CONTENTS 1 SCOPE 3 2 STANDARDS AND CODES 3 3 GENERAL 4 4 SYSTEM DESIGN 4 4 1Environmental Conditions 4 4 2Potential 4 4 3Number of Anodes Required 4 4 4Preferred Anode Locations 5 4 5Prohibited Anode Locations 5 5 ANODES 5 5 1Electro Chemical Valve 5 5 2Closed Circuit Potential 5 5 3Construction 5 6 GUARANTEE 6 7 MATERIAL INFORMATION 7 7 1Dimensions 7 7 2Electro chemical Value 7 7 3Anode Weights 7 7 4Electric Potential 7 7 5Anode Composition 7 7 6Quality Assurance and Quality Control Procedures 8 7 7Test Procedures 8 7 8Handling 9 7 9Certificates 9 8 INSTALLATION 9 COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0043 9 1 SCOPE 适用范围适用范围 This specification describes the minimum requirements for an aluminum alloy sacrificial cathodic protection system to be installed on a fixed steel offshore platform in the South China Sea 此规格书描述的对牺牲铝合金的阴极保护法的最低需要是应用于安装在中国南海的 海洋平台上的 Site specific cathodic protection requirements are included in this specification Interpretation and application of this specification is subject to local laws codes and regulations applicable to the People s Republic of China PRC and no statement contained herein shall be construed to limit or restrict the work to such minimum requirements It shall be the responsibility of the CONTRACTOR to make himself aware of the local regulations and advise ACT OG of any specific requirements on the cathodic protection system 这篇规格书提及了需要阴极保护的详细的位置 这篇规格的译文和申请应遵从中华 人民共和国 PRC 当地的法律 法规和编码 在此没有陈述的内容应译为对施 工的最低要求 承包商有责任遵守当地的法规和业主的关于阴极保护系统的要求 2 STANDARDS AND CODES 标准和编码标准和编码 The cathodic protection system shall be in accordance with good marine practice in corrosion protection and in compliance with the following codes and standards to the extent applicable 阴极保护系统应符合良好的施工惯例 同时遵从以下可适用的编码和标准 NACE RP 01 76National Association of Corrosion Engineers Corrosion Control on Steel Fixed Offshore Platforms Associated with Petroleum Production latest edition ASTM A36American Society of Testing and Material Specification for Structural Steel ASTM A 53 82Pipe Steel Black and Hot Dipped Zinc Coated Welded and Seamless API RP 2LRecommended Practice for Planning Designing and Constructing Fixed Offshore Platforms latest edition SSPC SP 10Steel Structure Painting Council Near White Blast Cleaning Any aspect of cathodic protection not specifically addressed in this specification or for which specification requirements are ambiguous shall comply with the National Association of Corrosion Engineer s Corrosion Control on Steel Fixed Offshore Platforms Associated with Petroleum Production NACE RP 01 76 latest edition This standard and other ACT OG specifications referenced herein shall be considered complementary to this specification and similarly binding on the Contractor Vendor Manufacturer 任何在此规格书中没有提及的关于阴极保护的内容 或是含糊不清的地方应遵从美 国腐蚀工程师协会 Corrosion Control on Steel Fixed Offshore Platforms COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0044 9 Associated with Petroleum Production NACE RP 01 76 最新版本 这些 标准和其它 ACT OG 规格书涉及的应作为补充 同样对承包商 卖主 制造商有 效用 3 GENERAL 概述概述 Cathodic protection systems shall be composed of sacrificial anodes with a configuration and anodic material composition suitable for use in the South China Sea Anodes shall be a standard model or series in regular production at the manufacturer s place of business 阴极保护系统应由牺牲阳极组成 同时阳极金属应适合南中国海的海况 阳极应是 标准有序生产的 4 SYSTEM DESIGN 系统设计系统设计 A cathodic protection system utilizing sacrificial aluminum alloy anodes suitable for protection of steel in a submerged marine environment 阴极保护系统是利用牺牲铝合金阳极来保护浸没在海水中的钢铁 4 1Environmental Conditions 环境条件环境条件 Location South China Sea 位置 Seawater Depth 329 9 水深 Seawater Temperature 66 F at sea bottom 70 F at surface 水温 Design Life 15 years 设计寿命 Current Densities 16 mA ft2 seawater 2 5 mA ft2 below mudline 海流密度 Ph 7 9 to 8 4 酸碱度 Dissolved Oxygen 3 5 to 5 3 ml l 含氧量 Resistivity 18 to 22 ohm cm 电阻系数 4 2Potential 电势电势 The cathodic protection system when complete shall have a potential of 0 80 volts negative as referred to a standard silver silver chloride Ag AgCl reference cell or 0 85 volts negative to a copper copper sulfate Cu CuSo4 cell 阴极保护系统中由银或氯化银形成的负极应处于 0 80 伏的电位 而由铜或硫酸铜 形成的负极应处于 0 85 伏的电位 4 3Number of Anodes Required 阳极的数量要求阳极的数量要求 The system shall consist of Galvalum III Aluminum Alloy Anodes or equal as located on the contract drawings Factors such as anode end face geometry trapezoidal rectangular circular etc and anode length shall be considered and COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0045 9 optimized in order to provide the most efficient current distribution about the structure 系统应由铝合金组成 按照合同图纸定位 诸如阳极端点几何形状 梯形 矩形 环型等 和阳极长度等因素应被仔细考虑 从而可以给结构物提供最有效的分流 4 4Preferred Anode Locations 首选的阳极位置首选的阳极位置 Anodes shall be located to achieve maximum efficiency of current distribution and uniform structure polarization Anodes shall be located such that a uniform distribution is attained Areas requiring increased anode concentration conductor bays etc shall receive particular attention with respect to anode distribution and placement 阳极的选位应为了得到最有效的分流和平衡结构的极化电位 需要阳极集中和增加 的区域应特别考虑阳极的分配和布置 4 5Prohibited Anode Locations 不许放置阳极的位置不许放置阳极的位置 Anodes shall not be attached to the following jacket members or at the following locations 阳极不能连接在以下导管架单元或位置上 Special high strength SHS steel requires prior ACT OG approval for all cases 加强段 SHS 任何情况下均需要业主的授权 Nodal points 节点 Well conductors or pump casings 钻井隔水套管或水泵套管处 Conductor framing members less than 12 diameter 直径小于 12 米的隔水套管 Disposal pile s 支桩 Spanning between two members 两个管件间的跨距 5 ANODES 阳极阳极 5 1Electro Chemical Valve 电化学操作阀电化学操作阀 The protective quality of the anode material shall be in the range 1150 to 1250 ampere hours per pound 阳极材料的保护能力应该在 1150 到 1250 安培小时每磅之间 5 2Closed Circuit Potential 闭合电路电位 The potential of the sacrificial alloy material shall be no greater than 1 10 volts referred to the copper copper sulfate Cu CuSo4 reference cell 牺牲阳极的电位不能超过负的 1 10 伏 5 3Construction 建造建造 Anode shall be the standard offshore standoff type 阳极应按照海洋支架类型建造 COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0046 9 Size and weight Anodes shall be of weight and dimensional shape suitable for a minimum 10 year protection nominally 614 lb net weight of alloy Core The core shall consist of nominal 4 inch schedule 80 A106 GR B pipe Anode material shall completely surround the core In general the anode material is made by casting the anode around a steel core Prior to casting the melt these cores shall be de scaled degreased grit blasted and cleaned to a near white finish in accordance with SSPC SP 10 within 24 hours of casting or before rust blooming appears As most of the alloys do not at all fuse with the steel core they shall be provided with indentations or other means to mechanically key the anode material adequately The design of the core in the anode material shall be such that excessive loss of anode material caused by crumbling away of the anode from the core is unlikely before 90 depletion of the anode has been reached Steel core bar type anodes shall have sufficient exposed steel to allow for easy installation by means of welding The steel core should be of sufficient strength to support the anode material in combination with 350 psf storm forces Particular attention should be paid to the attachment details of core to the marine structure Standoff Legs shall be offset per manufacturer requirements from the core centerline Standoff legs shall be fabricated by 2 smooth bends of the core through anode end faces curvature of the core to begin no closer than one 1 inch from each anode end face Fabrication of legs by bending the anode core through the lower anode face is prohibited The free ends of the legs will be welded to the jacket member with four 4 1 4 by 6 x 6 gusset plates on each pipe standoff unless otherwise shown on the Drawings CONTRACTOR shall shape the gusset plates to fit the contour of respective tubular or doubler plates and weld all around the gusset and doubler plates Doubler plates of 1 2 ASTM A36 are required where anodes are attached to jacket members with wall thicknesses less than 3 4 and where attached to special high strength steel The plates are to be welded all around to jacket members The standoffs shall be seamless ASTM A106 GR B or API 5L GRB 6 GUARANTEE 担保担保 The CONTRACTOR shall guarantee the minimum Electro chemical value of the anode material offered in ampere hours per pound and this guarantee shall be furnished with the information shown required in 7 0 below Furthermore the CONTRACTOR shall warrant that all data calculations assumptions etc used in the subject cathodic protection system are applicable and in accordance with COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0047 9 responsible engineering practices and industry standards A listing of all pertinent design criteria assumptions and sample calculations demonstrating the effectiveness of the subject system shall be supplied with any and all proposals 7 MATERIAL INFORMATION 材料信息材料信息 CONTRACTOR shall furnish the following information relative to the anodes 承包商应提供以下阳极材料的信息 7 1Dimensions 直径直径 Dimensions of drawings of all anodes and supporting parts or accessories and as follows 所有阳极和支撑部分或附件的直径如下 Dimensional Tolerances 直径公差 The maximum deviation of anode dimensions shall not exceed 1 2 12 mm of that specified 阳极直径的最大偏差不能超过 12 mm Surface Defect Tolerances 表面缺陷公差 The anode surface should be generally free from defects affecting the anode efficiency Anodes with the following defects will be rejected 阳极的表面一般不能有影响作用的表面缺陷 以下缺陷不能被通过 Cavities exceeding 1 2 12 5 mm in the largest dimension and 1 4 6 mm in depth 最大直径超过 12 5 mm 和深度超过 6mm 的洞 Cracks exceeding 5 64 2 mm in width 12 300 mm in length and intersect each other 宽超过 2mm 长超过 300mm 的裂缝 Cracks penetrating to the core 透到中心的裂缝 Apparent slag or dirt inclusion 显眼的熔渣和污垢 7 2Electro chemical Value 电化学值电化学值 CONTRACTOR shall supply guaranteed minimum Electro chemical values in ampere hour per pound for the anodes 7 3Anode Weights 阳极重阳极重 The weight of each anode shall be within 2 of that specified and the total weight of anodes shall be within 1 2 of that required based on parameters stipulated herein 7 4Electric Potential CONTRACTOR shall supply minimum maximum and average closed circuit potential in volts for each pour COMPANY CACT OPERATORS GROUPDATE REVISION COUNTRY CHINA06 04 030 LOCATION SOUTH CHINA SEADOC NO SHEET OF CACTOPERATORS Group AREA HUIZHOU FIELDSCACT NONE S F993 S0048 9 7 5Anode Composition CONTRACTOR shall supply chemical components and percent by weight 7 6Quality Assurance and Quality Control Procedures CONTRACTOR shall provide the quality assurance and control procedures for the cathodic protection system 7 7Test Procedures ACT OG the prevailing governmental authority and their representatives shall be permitted full access to the foundry and all sub contractors facilities to witness inspections at times arranged in conjunction with the contracted anodes manufacturing It is the Contractor s responsibility to perform all inspections specified in the quality control procedures and this specification or as requested by ACT OG At ACT OG s request an inspection shall be made prior to commencement of casting to ascertain that moulds casting equipment and other components comply with the applicable codes of practices The extent of inspections specified in this Section or as otherwise specified on contract drawings are minimum standards to apply If a substandard anode is detected the subsequent number of anodes to be inspected shall be doubled from the previous inspection The inspection shall consist of the following a Weighing Each anode shall be weighed b Dimensional Measurement At least 10 of the anodes on a marine structure shall be measured to verify compliance c Surface Visual Inspection All anodes shall be visually inspected for possible defects d NDT Inspection At ACT OG s request a prescribed percentage of the anodes shall be non destructively tested NDT for defects The testing method s shall be determined by ACT OG and shall be in accordance with ACT OG s specifications At least one 1 anode from each production casting shall be tested to measure its closed circuit potential and Electro chemical efficiency If the sample fails either test two 2 additional samples from the same lot shall be re tested The anode lot w