CONTENT 目录

　 1. Purpose 目的

　 2. Reference

　Documents 参考文件 3

　general description 一般规定

　 4

　Pipelines installation 管线安装

　 attached 附录

　1

　Pipe Spool Prefabrication And testing Layout 管线分段预制及试验图

　2

　Distribution of lifting points for spools 管段吊装吊点分布图

　1. Purpose: This document is prepared for the prefabrication, hydro test and installation by section of U/G FW piping for HDPE/PP plant .Performed of golden joints is required in order not to have a wet pipe inside trenches with problem of water removal and to shorten the

　duration between excavation and backfilling of pipe trench for easy HSE management. 目 目的：本文适用于 HDPE/PP 装置 FW 系统埋地管线进行分段预制、试压和安装。考虑埋地管线试压后排水、吹干，同时为了缩短管沟从开挖到回填之间的时间，便于现场 HSE 管理，必须应用黄金接口。

　2 Reference

　Documents 参考文件 NH-HDPE+PP-WPR-206 Procedure For Underground System Excavation and Backfilling

　地下工程开挖和回填程序 NH-HDPE+PP-WPR-208 Procedure for Process Piping Construction 工艺管线施工程序 NH-HDPE+PP-WPR-211 Procedure for Hydrostatic Testing and Flushing of Piping

　 管线水压试验及冲洗程序 NH-HDPE+PP-WPR-230 Pipeline coating procedure 管线缠绕及涂层补口程序 NH-HDPE+PP-QCPR-307 Pipelines welding procedure 管道焊接程序 NH-HDPE+PP-QCPR-322 Procedure for Dimensional Control 尺寸控制程序 NH-HDPE+PP-QPL-302 Piping Quality Plan 管线质量计划 GB50235-97 Code for construction and acceptance of industrial metallic piping

　工业金属管道工程施工及验收规范 GB50236-98 Code for construction and acceptance of field equipment ,industrial pipe welding engineering 现场 、工业管道焊接工程施工及验收规范 3

　general description 一般规定 3.1 Handling and off loading pipe at job site.管线在现场预制 3.2 Pipes will be lay down on sands bags. As following dwg.管线布在沙袋上，如下图

　 3.3 The lines would assembled as per attached sketch in 9 subsections named A~I 管线按附图预制，共 9 段 A~I。

　3.4 Even 4 golden joint are required . the subsection would be tested as per sketch named A~I有 4 个黄金接口，管段 A~I 按附图试压 3.5 Lines named A~I would be tested on the ground . applying 1.5 times design pressure. Hydrotest battery limit per subsection named A~I shall be reported on relevant test packages 管段 A~I 在地面试压，试验压力为设计压力的 1。5 倍。管段 A~I 的试压分界见相关试压包 3.6 Before hydrotest pipes shall be restrained using sand bags to ensure that impressure movement / deformation don’t occur

　试压前，用沙袋固定管段，确保管段泄压时不移动和变形。

　3.7hydro tests shall be in accordance with NH-HDPE+PP-WPR-211 Procedure for Hydrostatic

　Testing and Flushing of Piping. 管段试压按管线水压试验及冲洗程序 NH-HDPE+PP-WPR-211 进行。

　3.8 no additional caps shall be utilized .All battery limit are on valves . so only blind flanges will be installed and marked-up on test package . Blind flanges thickness would be as per attached table 试压分界定在阀门法兰处，不须加额外的封头，加法兰盲板就行。法兰盲板的厚度见下表。

　 附：FW 系统试压盲板厚度选用表(单位 mm)

　Attachment: Table of FW System Blind Plates to Be Used for Hydro Test (Unit: mm) 序号No. 公称直径 Nominal Diameter of pipe 厚度等级

　 Schedule No. 内径 Inner diameter 插入式盲板Thickness of Inserted blind plate 平堵头 Thickness of Flat plug 备注 1 150 Sch 40 154.08 10 14

　2 200 Sch 30 205.02 12 18

　3 250 Sch 30 257.50 14 22

　4 300 Sch 30 307.14 18 26

　5 350 Sch 30 336.54 20 28

　6 400 Sch 30 387.34 22 32

　 3.9 All joints after hydro test except 4 golden joint will wrapped as per specification. 试压后，除 4 个黄金口外，所有的接口都防腐。

　3.10 holidays test shall be performed just before to lift pipe for installation on the trench . 电火花试验在吊管下沟前完成。

　4 Pipelines installation 管线安装 Subsection B . C . D after hydro test and drying by air blowing (using compressor ) .Pipelines will be cutted on G.S location as per attached sketch . Both bevels will be provide.管段 B、C、D 试压吹干后，按附图在黄金口处切开，加工两边坡口。

　Pipelines will be installed under trenches using 2 cranes if the pipe length is within 60 m . or 3 cranes when exceed . For distribution sketch of lifting points, see the attached drawing. 管线在 60 米以内，用两台吊车吊装，超过时用三台吊车。吊点分布示意见附图

　In order to facilitate installation, adjustment

　 and holiday test, the bottom of the pipe trench,

　where sand bags are to be laid in every 4m,

　shall be about 100mm lower than the bottom of pipes. 为便于安装调整和电火花试验检查，管沟底应比管底低约 100 毫米，在沟底每隔 4 米铺设一个沙袋。

　When both locations of pipe are laid down in the trenches .fit-up and weld will be completed . 下管后，进行组对焊接 X-ray(100%) shall be performed on the 4 golden joints 黄金接口进行 100%的 X 射线探伤。

　Manual derusting of welding joints to be primed

　and wrapped shall be performed to

　St3(using

　electric wire brush) grade. Primer P19 and polyethylene/butyl rubber coating adhesive tape T-380 shall be applied. The total thickness will be 3.2mm min. 补口处进行手工除锈，达到 St3 级标准。选用 P19 型底涂漆及 T-380 聚乙烯/丁基橡胶绝缘防腐胶带，防腐层总厚最小为 3.2 毫米。

　 100% holiday test shall be made to

　wrapping layer, and the test voltage

　 V=7843×3.2 1/2 =14030 v. 防腐层进行 100%的电火花试验，试验电压为 V=7843×3.2 1/2 =14030 伏。

　Sand layer, which must be 100mm

　 higher than the top of the pipe, shall be backfilled in two layers with the first layer backfilled to the pipe center. Both layers shall be sprinkled with water

　 Method statement for prefabrication, pressure test and installation by spools of underground FW system 埋地 FW 系统分段预制、试压和安装方法 28/01-04

　号 编号 Ref. No:

　NH- HDPE+PP-WPR-241 Plant:

　PP+HDPE Contractor:

　 TCM REV：D Client:

　 CSPC Subcontractor:

　CP6CC Page 5 of 5

　and compacted, and then backfilled with soil. . 沙层回填必须高过管顶 100 毫米，分二层进行，第一层至管中心，每层均要浇水使沙层密实，然后填土. To complete installation if valves won’t be available . flanged spool will be erected to keep pipes

　alignment and protected。安装时如阀门未到，用自制法兰短节代替。