2. Construction Program The fabricated pieces will be assembled into one piece on site, and will be lifted in place after installation of wall plates.
? 顶板预制前应绘制排版图。顶板任意相邻焊缝的间距，不得小于200mm。Before
prefabrication, the plate arrangement drawing shall be prepared. The spacing between adjacent welds of roof plates is not less than 200mm.
? 单块顶板本身的拼接，采用对接。The splicing of single roof plates themselves shall
be butt connected.
? 拱顶的顶板预制成型后，用样板检查，其间隙不得大于10mm。After the
prefabrication of the roof plate of cone roof it is checked by template and its clearance shall not be more than 10mm.
g) 构件预制 Accessory part prefabrication
? 加强圈、包边角钢等弧形构件加工成型后，用弧形样板检查，其间隙不得大于
2mm。After fabrication of such accessory parts as reinforcement ring and top angle etc., they are inspected by arc template, its clearance shall not be more than 2mm. ? 排液槽顶部与底板坡度相同。The same slope for top and bottom part of drain
channel
? 预制阶段的所有工作在车间内完成，预制完成后运输至现场，卷制成形的钢板需
要放置在与成形的钢板曲率半径相同的运输托架上运输至现场，托架与不锈钢板接触处要衬不锈钢薄板或者橡胶板。All the prefabrication work will be finished in the work shop first and then transported to the site. When transporting, the rolled plates shall be put on specially-made transport straddle with the same bending radius of that formed plate, and stainless steel sheet or rubber pad is required between the straddle and stainless steel plate.
3.4.4 储罐现场制作 Storage tank site fabrication
a) 底板安装 Base plate installation
? 基础质量符合技术验收要求后，按照储罐底板排版图，在基础上放出底板实样，
同时也定出方位角度线。并在基础侧面留下永久记号，避免在施工中破坏所需的方位角度线，造成重复施工影响进度。After the quality of foundation comply with acceptance requirement, the actual base plates are set out on the foundation as per tank
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2. Construction Program base plate arrangement drawing, determining the lines of bearing angles. Permanent marks have to be left on the side of the foundation to avoid damaging the line of required bearing angles and affecting the construction progress.
? 2).储罐底板在全部边缘板连接定位后才能进行边缘板对接缝的焊接。施工的焊接
位置必须对称布置，焊后进行打磨，并按有关规定的技术要求进行焊缝检验；After all the edge plates at the bottom tank are connected and aligned, the butt welding can be started. The welding must be done in symmetric way. After welding, the grinding is required and check for welding joint according to the specific technical requirement. ? 底板安装的质量检查和控制按照相关标准和规范执行，并按要求对其表面进行清
理，做好相应的标识；Please refer to relevant code and specification for base plate installation quality inspection and control, cleaning and marking the surface properly as per corresponding requirement.
? 底板包括贮液槽等构件全部点焊定位后必须对焊缝位置进行除污、除尘工作。符
合要求后方可按照焊接工艺、标识焊缝编号与分界线，按照下文的罐底焊接顺序，分段进行退焊或跳焊法进行底板的焊接，并在第二遍的焊接中错开分段焊接的接口处，确保焊缝熔合的整体质量，完成底板的焊接工作；(详见焊接施工程序) The welds must be saint, dust and rust eliminated properly after the all base plates including drainage sump etc are fully tack welded. When the requirements are met, mark weld number and boundary line. Refer to the tank bottom welding sequence of the bottom welding as below , use the process of back-step sequence or jumping welding for base plates connection, and stagger the previous sectional joints in the next/second welding to assure the internal fusion quality to complete the welding of base plate.
? 焊接完成后，用吊车提高底板的高度，按照图纸的要求进行RT检验，经检查符合
验收要求后，利用吊车完成底板的正式就位安装，并在已就位后底板上标出设备中心线与壁板位置的拼装线及其他附件的方位角度线，以便下一步的移植工作。The welded base plates are lifted to certain height by crane and RT testing for them as per drawing requirement. After inspection and acceptance, the base plates are formally positioned by crane and then mark the centerline and wall plate assembling lines and the bearing lines of other accessories for next steps of transplantation. 注：储罐焊接详情见焊接施工程序。
Note: See welding procedure for storage tank welding details. b) 壁板安装 Wall plate installation
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2. Construction Program ? 壁板用正装法安装，主要是由下而上的拼装壁板，来完成壁板的安装。吊装前在
底板上放出的壁板组装的方位角度线与壁板定位的位置线，在位置线内每隔一定的间距设置定位板，以便控制壁板拼装时储罐筒体的直径尺寸与圆度；Wall plates will be installed in the down-to-up way. Before lifting, bearing lines and position lines for assembling and locating of wall plates are set out in the completed base plates, and the positioning plate is set up at regular spacing between the position lines to control the diameter and roundness of tank cylinder when installing wall plates.
? 第一层壁板的吊装位置必须正确，其组成的几何尺寸略大于设计尺寸，垂直度必
须控制在+3mm以内，同时用斜支撑固定壁板上部，调整壁板垂直焊缝间隙并与上口平整，符合要求后点焊定位并在垂直焊缝处加焊弧形加强板，尽量减少焊接时的壁板变形，在壁板外部上口安装连接夹板；相邻两壁板上口水平的允许偏差,不应大于2mm。在整个圆周上任意两点水平的允许偏差，不应大于6mm，壁板的铅垂允许偏差，不应大于3mm；组装焊接后，在底圈罐壁1米高处，内表面任意点半径的允许偏差，应符合下表：The first circle of wall plates must be correctly lifted in place and its completed dimensions are slightly greater than design dimensions. Its verticality must be controlled within +3mm, and meanwhile brace the top of fixed wall plates, adjust the clearance of vertical welds and flush with upper opening. After meeting the requirement, provide tack welding and arc stiffening plates welded at vertical welds to minimize wall plate deformation due to welding. Install connection plate at outside top of wall plates. The allowable horizontal deviation of upper opening of adjacent two wall plates is not more than 2mm. The allowable horizontal deviation at any two points of one circle shall not be more than 6mm. The allowable vertical deviation of wall plates shall not be more than 3mm; After fit up and welding, at 1 meter height of the lowest circle of wall plates, the allowable radius deviation of inner wall at any point shall comply with following table:
底圈壁板1m高处内表面任意点半径的允许偏差 Allowable radius deviation of inner wall at any point at 1m height of the lowest circle of wall plate 罐直径D（m） 半径允许偏差（mm） D≤12.5 12.5＜D≤45
? 第一层壁板的焊接施焊，必须在第二层壁板连接、点焊定位后，才可进行第一层
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±13 ±19 2. Construction Program 的垂直焊缝焊接，施焊程序详见焊接程序。After 2nd circle of wall plates are tack welded, the vertical welds of first circle of wall plates can be welded. Welding Procedure give detailed description.
? 第二层以上壁板吊装安装按照排版组装图的位置就位，在下层板锁紧夹板的相应
位置上，安装卡板，并用直槽钢加楔子锁紧来完成临时连接，然后调整垂直度、环向焊缝和径向焊缝的间隙与错边，合格后才能点焊固定，在垂直焊缝位置要装防变形胎具。必须在上层壁板拼装点焊固定后，方可进行下层壁板的垂直焊缝施焊，待下层的垂直焊缝完成后才能进行该层环向焊缝施焊工作；The wall plates above second circle is lifted and positioned as per plate arrangement drawing. Install the clip plate at the corresponding position where to install the locking clamping plate of the lower plates and connected temporarily by straight channel steel and wedge for locking and connection. Then adjust its verticality, the clearance of circumferential welds and radial welds, and misalignment. After being qualified, it can be fixed by tack welding. The arc plate is installed at vertical welds to prevent deforming. Start welding the vertical joints of lower circle of wall plates only after tack welding of upper circle of wall plates. Start welding the circumferential joints only after welding of the vertical welds of upper circle of plates.
? 按上述方法完成最上部壁板的调整点焊固定后，先完成局部与上口包边角钢连接
部的焊缝焊接（因为安装包边角钢后，该部分焊缝被覆盖，必须先进行焊接），然后拼装包边角钢和进行该层壁板的垂直焊缝和环向焊缝的焊接工作，进而完成整个壁板的安装焊接工作；On completion of tack-welding of the top circle of wall plates as per the above stated method, first weld the local portion with top angle (this part of welds will be covered after installation of top angle, therefore they must be welded first), then assemble top angle and start welding of vertical and circumferential welds of this circle of wall plates to finally end all installation and welding of whole wall plates. ? 焊缝表面清理后进行焊缝的各项检验检查工作，同时做好检查位置的标识标记工
作；Various tests and inspections are carried out after cleaning the welds surfaces and make marking at inspected and tested places.
? 壁板安装时可采取搭设脚手架或者挂架的方法。The scaffolding or temporary
platform can be adopted for installation of wall plates.
c) 罐顶安装 Roof plate installation
? 吊装前的准备，通过计算与放大样，取得顶板高度的准确数据，确定安装用中心
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Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program 支撑钢架与其他同心支撑架的高度与位置，并安装就位完。同时把储罐中心十字线移植到中心架与包边角钢上，划出具体位置线；Preparation before lifting: determine the accurate height of roof plates by calculation and plates layout/actual plate arrangement, determine the height and position of steel central support frame and other concentric steel support frame to complete installation and positioning. Meanwhile transfer the tank central cross-line onto the central frame and rolled angle steel to mark out the actual position lines for roof plate installation.
? 罐顶安装焊接检查合格后，按设计图示方位进行按管嘴开孔定位，经工程师和QC
检查人员复核后方可进行开孔/安装接管/补强板/人孔等附件，然后拆除顶板安装的临时支撑架，清理储罐内部不需用的杂物，确保施工环境安全；After qualified installation and welding inspection for roof plates, the nozzles are oriented as per design drawing. After checking by engineer and QC inspector, make openings, install nozzles, reinforcement pads, manholes etc. Afterwards, dismantle the temporary supports for roof plate installation; clean the wastes inside the storage tanks for safe construction conditions.
d) 附件及盘梯安装 Accessories and circular ladder installation
? 设计图示方位在罐体上进行开孔定位，经工程师和QC检查人员复核确认后方可进
行开孔工作，安装罐壁的接管、补强板、支架等附件；Fix the orientation of openings as per design drawing. The holes can be made only after engineer and QC inspector’s review and confirmation, then install the accessories such as nozzles, reinforcement pads, supports etc.
? 接管补强板气密性检查应符合要求；Air tightness test for reinforcement pads of
nozzle shall comply with the relevant requirement.
? 开孔接管的中心位置偏差,不得大于10mm；接管外伸长度的允许偏差应为±5mm；
The central position deviation of opening of nozzle shall not be greater than 10mm. The allowable deviation of extruding length of nozzle shall be ±5mm.
? 开孔补强板的曲率，应与罐体曲率一致；The curvature of reinforcement pad at
opening shall be consistent with that of tank.
? 开孔接管法兰的密封面应平整，不得有焊瘤和划痕，法兰的密封面应与接管的轴
线垂直，倾斜不应大于法兰外径的1%，且不得大于3mm，法兰的螺栓孔，应跨中安装。The sealing face of flange for pipe connection shall be level without overlaps and scratch. The sealing face of flanges shall be vertical to the axis of connection pipe with inclining not be greater than the flange outside diameter by 1% and 3mm. The bolt
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Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project