【正文】 的最后一道固定口應盡量遠離機器。 The valve pocket must be cleaning and no impurity when installation, the seal surface of flanged valve shall not have the nick and fleck, installation direction shall be according to it’s structure and the flow direction of fluid. The direction of the valve rod shall be as per the requirements on the drawing. 法蘭連接的閥門和以螺紋方式連接的閥門應在關(guān)閉狀態(tài)下安裝，以焊接方式連接的閥門應 在開啟狀態(tài)下安裝，焊接宜采用氬弧焊打底。 Hangers and supports shall be installed timely when piping installed. It shall be set a reliable support temporarily. Supports and hangers shall be installed as soon as the condition is available. 管道安裝時，應及時固定和調(diào)整支吊架。兩根熱位移方向相反或位移值不等的管道，不得使用同一吊桿。 CPVC pipe with hot fusion welding. 焊接施工準備 Welding preparation 管道焊接施工前，應根據(jù)設(shè)計文件和規(guī)范、標準要求對所用各種材質(zhì)管道，進行焊接工藝評定，并依據(jù)焊接工藝評定報告編制焊接工藝技術(shù)文件。 it is acceptable that temperature at tack welding point reach the required value. 點固焊 的焊縫高度要求為焊件厚度的 70%以下，且應 ≤6mm；點固焊的焊縫長度為 10～ 30mm，點固焊點數(shù)為 2～ 5 點。 Principle of piping welding material selection: welding material must meet the requirements of chemical position, mechanical property, welding property, process fluid and welding process. 管道焊接接頭坡口形式、尺寸、管口組對要求見焊接工藝評定。 管子膨脹方向 piping expansion direction 1/2 位移值 displacement 支架中心線 center line of support 管托中心線 center line of pad 滑動支架安裝位置 slide support installation position 17 Site assembly welding process of piping is semiautomatic arc welding and manual arc welding. For joints of piping rack piping whose position is easy for welding, semiautomatic arc welding are adopted。 The sliding surface of slide and guide support shall be smooth and clean, it mustn’t be deflecting and blocking. Installation position of support shall be displaced from center of supporting surface to the converse direction of hot displacement. The displacement value is 1/2 hot displacement or per the design requirement. 15 16 固定支架的安裝 Fixing support installation 固定支架應按設(shè)計要求進行安裝，并應在管道補償器預拉伸前固定完畢。安全閥應檢驗、試驗合格，調(diào)試完畢并進行鉛封 (除必須用介質(zhì)調(diào)試的 )。 During installation of the piping for the machine set and pump, use the dial gauge set on the coupling to monitor machine displacement, which should meet the requirement in Table 2 below. After the piping passes the pressure test and purging, make a resetting inspection on the joint between the piping and the machine, and the deviation should still lie within the specified range as shown in Table 1 and Table 2. 與機器連接時機器允許位移值 表 Allowable displacement of the machine, when it is connected. Table 機器轉(zhuǎn)速 RPM (r/min) ≤6000 ?6000 位移值 Displacement (mm) ? ? 管道系統(tǒng)與機器最終連接時，應在聯(lián)軸節(jié)上架設(shè)百分表監(jiān)視機器位移，機器位移值應符合表 的規(guī)定。 Before installation of the piping of the machine set and pump, check to make sure that the specifications, material and grades of the prefabricated pipe sections, 11 fittings, valves, gaskets and fasteners, as well as the code identification of the pipe sections correspond with those indicated in the drawings. 機組、機泵的管口應將封閉物拆除，清理、檢查管密封面，核實機組、機泵管口法蘭結(jié)構(gòu)形式、等級同管道法蘭相匹配，向上的管口應加鍍鋅鐵皮盲板，防止管道安裝時異物掉入機器內(nèi)部。 should be installed in the same direction. Tightened nuts should be close against the flange, leaving no seam, and should better be flush with the end surface of the bolt. Bolts should be tightened symmetrically and then sequentially, or tightened three times: symmetrically, at intervals, and sequentially. Piping bolts and nuts should be coated with molebdenum disulphite grease, graphite oil or graphite powder before installation. 管道對接接口組對，按焊接要求對管口內(nèi)外和坡口進行處理，管口組對用平板尺測量，在距管口中心 200mm 處測量平直度，如下圖所示 : For piping butt pairing, the interior and exterior of the orifice and the groove shall be treated in accordance with welding requirement. Measure orifice pairing with a flat plate ruler, and measure the straightness at 200mm from the orifice center, as shown in the 9 figure below: 管道對接口平直度測量 Measurement of straightness of piping butt 管道對接平直度測量允許偏差 Allowable deviation for measured straightness of piping butt 管道規(guī)格 Piping specification 允許偏差 Allowable deviation 全長允許偏差 Allowable deviation over the entire length DN ? 100 mm 1 mm ≤ 10 mm DN ≥100 mm 2 mm ≤ 10 mm 管道的點固焊，應等同正式焊接，其焊接工藝、材料和控制應嚴格執(zhí)行相應管道的焊接工藝要求 (詳見管道焊接 )。 Piping must be installed in the sequential installation method in accordance with 不合格 安裝 準備 土建結(jié)構(gòu) 、 設(shè)備安裝交接 預制管段 、 管路附件檢查 、 清理 管道支撐件 、管架安裝 管道組裝 、 點固焊接 管道 焊接 管道焊縫檢查及無損檢測 管道安 裝共檢 管道試驗 、 吹掃 (清洗 )氣密 管道焊接缺陷消除 管道安裝一般程序 nonconforming Installation preparation Building structure and equipment installation/handover Check and clearance of prefabricated pipe sections and fittings Installation piping supports and brackets Piping assembly tack welding Piping welding Piping weld check and NDT Joint inspection of piping installation Piping test, purging (cleaning), tightness removal of piping welding defects Normal piping installation procedure 8 positions in the construction drawings and code identification of the prefabricated piping. Internal checks and clearance should be made again of the pipe sections, fittings and valves with damaged sealing (plastic cap, plastic cloth or block board), and they can only be assembled, connected and welded after they are proved to be in conformity. 合格的法蘭、閥門、墊片密封面安裝時不得發(fā)生損壞，若發(fā)生影響密封損壞要立即更換、修復，方可安裝連接。 Pipe rack piping Π type expansion, pipeline accessories, and the pipe section from the pipe rack to the equipment will be installed via the crane for each piece and each section. Install the pipe rack piping in position firstly, and then install expansion, accessories and pipe sections leading to the equipment one by one by using the crane