【正文】 The tack weld height shall be less then 70% of base material thickness, and shall be ≤6mm. The tack weld length shall be 10～ 30mm, the quantity sha。 Electrode used to tack welding shall be the same as that used to normal welding, and also the specification of electrode bake and tack welding preheat. Anyhow, the heat range can be smaller for tack welding。 Shape and size of groove and assembly specification of piping joint refer WPQR. 焊接工藝 Welding procedure 管道焊接前，必須依據(jù)焊接工藝評(píng)定 (WPQR)結(jié)果，編制專項(xiàng)焊接工藝規(guī)范 (WPS)，按照專項(xiàng)工藝規(guī)范 (WPS)的焊接工藝要求進(jìn)行焊接施焊。 Welding engineer should give welders and welding operators a detailed technical explanation before welding work starts, and request welders and welding operators master welding methods, procedure, and technical specification and quality control standards. 壓力管道施焊環(huán)境條件應(yīng)符合以下要求： Welding environment condition of pressure piping shall meet following requirement: 風(fēng)速：氬弧焊 2m/S，手工電弧焊 8m/S； 18 Wind speed: argon arc welding 2m/S, manual arc welding 8m/S. 焊接材料選用 Welding material selection 管道焊接材料選用的基本原則：焊接材料必須滿足管道材料的化學(xué)成份、力學(xué)性能、焊接性能及工藝介質(zhì)和焊接工藝要 求。 Before piping welding, welding process qualification record (WPQR) shall be done for all piping material used to per design documents, standards and codes, and then pile the welding procedure technical files according to WPQR. 管道焊接施工前，應(yīng)組織施焊人員進(jìn)行技術(shù)培訓(xùn)，并根據(jù)業(yè)主要求按相應(yīng)的標(biāo)準(zhǔn)、規(guī)范進(jìn)行焊接技能考試，需取得相應(yīng)的焊接資格。 For piping of utility system (press air, instrument air, circling water and cooling water, etc.), manual arc welding are applied. CPVC 管道采用熱镕焊。 for all other joints, manual arc welding are adopted. 裝置工藝系統(tǒng)管道全部采用手工氬氣保護(hù)焊接打底，手工電弧焊接蓋面的方法焊接。 Stress condition of hang rod shall be checked after installation. If hang rod is loose, the hang pole bolts shall be adjusted and strained tightly. 8 管 道焊接 piping welding 焊接方法及焊接施工準(zhǔn)備 Welding process and preparation 焊接方法 Welding process 管道的現(xiàn)場組裝連接焊接采用半自動(dòng)電弧焊接和手工電弧焊接兩種方法，管廊管道位置方便的連接焊縫用半自動(dòng)電弧焊接；其余，全部采用手工電弧焊接。 The rod of hanger without hot displacement shall be vertical. Hang point with hot displacement shall be set on the side converse the hot displacement direction. The displacement length is 1/2 hot displacement. Two piping whose hot displacement are converse or hot displacement value are not the same mustn’t use one hang rod。 Fixing support shall be fixed firmly. Weld quality shall be ensured when it need to be fixed by welding. It must apply double nut to fix when Ushape clip is used in order to avoid loose. 管道吊架的安裝 Piping hanger installation 無熱位移的管道，其吊桿應(yīng)垂直安裝；有熱位移的管道，吊點(diǎn)應(yīng)設(shè)在位移的相反方向，按位移值的 1/2 偏位安裝。 Fixing support installation shall be meet the requirement of design and shall be fixed before pretension of piping pensator. 固定支架應(yīng)固定牢固。 Stainless steel piping mustn’t be welded with carbon steel supports directly. It shall be used a camber or rib plate whose material is the same as the piping to isolate piping and carbon steel support. It shall be used a plate such as rubber plate or plastic plate which chlorine content is not more than 25ppm to isolate the stainless steel piping and carbon steel clip/beam rack. 滑動(dòng)和導(dǎo)向支架的安裝 Slide and guide support installation 滑動(dòng)和導(dǎo)向支架的滑動(dòng)面應(yīng)平整潔凈，不得有歪斜卡澀現(xiàn)象；支架安裝位置應(yīng)從支撐面中心向位移反方向偏移，偏移量應(yīng)為位移值的 1/2 或應(yīng)符合設(shè)計(jì)文件規(guī)定。支吊架位置應(yīng) 準(zhǔn)確，安裝應(yīng)平整牢固，與管子接觸應(yīng)緊密。 Safety valve shall be installed vertically. When installation pleted and pass the inspection, make an installation record. 支架安裝 Support installation 支吊架安裝 Hangers and support installation 管道安裝時(shí)，應(yīng)及時(shí)安裝支吊架，確因某些特殊原因無法及時(shí)安裝支吊架時(shí) ，應(yīng)臨時(shí)墊置固定牢靠，待條件具備后立即安裝支吊架。 14 Inspection and test condition of the safety valve shall be checked before installation. Safety valve shall be acceptable by inspection and testing. It must be lead sealed after adjusting (except that adjusted by fluid). 安全閥應(yīng)垂直安裝。 When casting valves are installing, the levelness and the aligent of flanges between valves and piping must be acceptable. Stress load on the connecting bolts must be equally, forced connect is forbidden. 安全閥安裝前，應(yīng)對(duì)安全閥的檢驗(yàn)、試驗(yàn)狀態(tài)進(jìn)行檢查核實(shí)。 Flanged valves and thread valves shall be installed under close condition, welded valves shall be installed under open condition. The root pass shall be welded by argon arc welding. 高溫、高壓系統(tǒng)的閥門安裝時(shí)，必須保證連接口組裝尺寸，嚴(yán)禁強(qiáng)力組對(duì)，焊接時(shí)，嚴(yán)格按焊接工藝規(guī)定 施焊。 Before install valves, installation persons shall check the size, model, and the marks of inspection and test for valves. The valves without inspection or not accepted mustn’t be installed. 閥門安裝時(shí)，閥腔內(nèi)必須清潔無物，法蘭連接閥門密封面不得有影響密封的劃痕和斑點(diǎn)，閥門安裝方向依其結(jié)構(gòu)形式與介質(zhì)流向確定，閥桿方向符合設(shè)計(jì)圖紙要求。 For the final connection between the piping system and the machine, set up a dial gauge on the coupling to monitor machine displacement, which should lie in the range as specified in Table . 機(jī)組投用時(shí)，其蒸汽和工藝系統(tǒng)管道的連接螺栓應(yīng)按要求進(jìn)行熱緊或冷緊，螺 13 栓的熱緊或冷緊按十字對(duì)稱緊固步驟進(jìn)行， 緊固的力矩值必須符合設(shè)計(jì)規(guī)定。管道經(jīng)試壓吹掃合格后，應(yīng)對(duì)管道與機(jī)器的接口進(jìn)行 復(fù)位檢驗(yàn)，偏差值仍應(yīng)符合表 和表 的規(guī)定。 The flange at the pipe end of the machine set and pump is connected to the piping flange. Keep the parallelism and axiality of the two flanges under control, and it should be possible to insert the connecting bolt freely. Hold the two flanges in position first. Then, align the connecting joint of the piping. For joint pairing purpose, set up a dial gauge on the coupling to monitor machine displacement. After pleting tack welding at the joint, dismantle the flange connection bolt, and weld the piping joint seam. The last fixing spot of the piping should be away from the 12 machine as much as possible. 機(jī)組、機(jī)泵連接管道安裝后，應(yīng)在自由狀態(tài)下檢查機(jī)組、機(jī)泵管口法蘭與管道法蘭的平行度和同軸度，法蘭的平行度和同軸度允許偏差應(yīng)符合下表 的規(guī)定。 During piping installation, there should be no foreign objects left inside the pipe sections, fittings and valves. Piping brackets and piping hangers/supports should be installed together with the piping. Large machine sets should be equipped with dial gauges to monitor machine set displacement during piping installation. 機(jī)組、機(jī)泵連接管道安裝，宜從設(shè)備管