熔盐储罐焊接施工方案(修改)

目录

1.工程概况 (3)

1.Project Summary (3)

2 编制依据 (3)

2 Compilation Basis (3)

3 施工准备 (4)

3 Construction Preparation (4)

4 焊前准备 (7)

4 Weld Preparation (7)

5 施工工序 (10)

5 Construction process (10)

6 熔盐罐底板组对焊接 (11)

6 Assembly welding for tank bottom plate (11)

7 熔盐储罐壁板的焊接 (16)

7 Welding of tank shell (16)

8 拱顶的焊接 (19)

8 Welding of vault (19)

9焊缝的修补 (20)

9 Repair weld (20)

10焊接检验 (21)

10 Welding inspection (21)

11 质量保证措施 (24)

11Quality assurance measures (24)

12 HSE保证措施 (30)

12 HSE Assurance Measures (30)

13工机具及人力资源 (43)

13 Machines & Tools, and Human Resources (43)

1.工程概况

1.Project Summary

本工程为2台20000m3拱顶冷、热熔盐储罐新建工程，工程所在地位于青海省德令哈市西出口太阳能发电基地内，工程内容包括储罐罐主体制作、安装、防腐、及相关检测。

This work is for two sets of 20000m3vault hot melt salt storage tank new project, the project is located in solar energy base of west exit of Delingha City, Qinghai province, and the project contents include fabrication, installation, anti-corrosion, and relevant inspection of the main body of the storage tank.

储罐结构形式为拱顶固定顶，共由五带壁板组成，壁板材质为Sa-516 Gr.70 N，壁板厚度从下到上依次为42mm、34mm、25mm、16mm、10mm。

The storage tank structure is fixed arch roof which is constituted with five shell plates. The material of shell plate is Sa-516 Gr.70 N，the thickness of shell plate from up to down in sequence is 42mm, 34mm, 25mm, 16mm and 10mm respectively.

2 编制依据

2 Compilation Basis

2.1 中广核德令哈50MW光热项目热传储热系统施工图

2.1 Construction Plan of CGN-Delingha 50MW Solar Thermal Power Generation Project Heat Transmission and Heat Accumulation System

2.2 合同、招标文件；

2.2 Contract, bidding document;

2.3 Q/JH121.11.004-92《安全技术操作规程》

2.3 Q/JH121.11.004-92 Safety Technical Operation Process

2.4 GB50128－2014《立式圆筒形钢制焊接储罐施工及验收规范》

2.4 GB50128-2014 Vertical Cylindrical Steel Storage Tank Welding Construction and Acceptance Specification

2.5 SH/T3530-2011《石油化工立式圆筒形钢制储罐施工工艺标准》

2.5 SH/T3530-2011 Technical Standard for Construction Vertical Cylindrical Steel Storage Tanks for Petrochemical Industry

2.6 GB50341-2003《立式圆筒形钢制焊接油罐设计规范》

2.6 GB50341-2003 Code for Design of Vertical Cylindrical Welded Steel Oil Tanks

2.7 GB/T709-2006《热轧钢板和钢带的尺寸、外形、重量及其允许偏差》

2.7 GB/T709-2006 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates and Sheets

2.8 NB/T47014-2011《承压设备焊接工艺评定》

2.8 NB/T47014-2011 Welding procedure qualification for pressure equipment

2.9 NB/T47015-2011 《压力容器焊接规程》

2.9 NB/T47015-2011 Welding specification for Pressure Vessels

2.10 GB/T985-1998《气焊、手工电弧焊及气体保护焊焊缝坡口基本形式与尺寸》

2.10 GB/T985-1998 Basic forms and sizes of weld grooves for gas welding manual arc welding and gas-Shielded arc weldind

2.11 GB/T986-1998《埋弧焊焊缝坡口的基本形式与尺寸》

2.11 GB/T986-1998 Basic forms and sizes of weld grooves for submerged arc welding 2.12 JB/T4730-2005《承压设备无损检测》

2.12 JB/T4730-2005 Nondestructive Testing of Pressure Equipments

3 施工准备

3 Construction Preparation

3.1 焊工考试

3.1 Welder Examination

3.1.1 所有参加熔盐罐制作安装工程的焊工必须经过严格的审核和正规的岗前培训，持证上岗，对从事埋弧焊、气体保护焊和手工焊的焊工，应按GB50236-2011《现场设备、工艺管道焊接工程施工规范》焊工考核的有关规定进行考试。

3.1.1 All welders who will take participation in the manufacture and installation of the hot melting salt tank must receive strict reviewing and regulated pre-job training and obtain certificates before being appointed the post. The welders who take participation in the submerged welding, gas shielded welding and manual welding should take examination as per relevant regulations for assessment of welders in Field Equipment,

GB50236-2011 Process Pipeline Welding Construction Specification.

3.1.2 对于首次施焊SA-516 Gr.70 N钢板的焊工，必须考试合格，才允许进行相应的焊接工作。

3.1.2 The welder who first welds SA-516 Gr.70 N steel plate must take the examination and then be appointed to conduct the welding work after examination qualification.

3.1.3 根据现场情况，在正式开工前，完成焊工考试情况。按焊工实际焊接类型分别进行考试。考试合格后，方可进行焊接操作。

3.1.3 According to field situation, the welder examination should be completed before formal starting of the construction. The examination should be prepared in line with the actual welding type respectively which will be performed by the welder. The examination qualified welder will be awarded with welder qualification certificate and will be appointed the post in line with certificate. No welding job for welder who failed to be awarded with welder qualification certificate.

3.1.4 焊接工作进行前，焊接技术员要对所有焊工进行焊接技术交底，让焊工熟知焊接工艺方案，熟练掌握所焊部位的材质种类和所采用的工艺方法，如坡口形式、焊材选用、焊接电压电流调节、焊接速度控制等，让焊工了解焊接应力与焊接缺陷的危害与预防措施。

3.1.4 Before welding, the welding technician should deliver technical details disclosure to all welders to make each welder be familiar with the welding technology plan, to perfectly master the materials classification and applicable technology for the welding parts, such as groove shape, welding materials selection, regulation of welding voltage and current, and welding speed control, in order to make the welders understand the hazards and prevention measures of welding stress and welding defects.

3.2焊接设备

3.2 Welding device

直流电焊机、CO2气体保护焊焊机、埋弧自动平（角）焊机等。焊接设备的电流表、电压表、等仪表、仪器以及规范参数调节装置应定期进行检验。上述表、计装置失灵时，不得进行焊接。手工电弧焊、氩弧焊焊机必须集中放置在离焊接区较近的焊机棚内；自动焊根据现场需要进行放置，放置焊接设备的场地必须保持通风良好、干燥、维修方便。Welding equipment: DC welder, CO2gas shielded welding machine, automatic submerged arc flat fillet welder, etc. Ammeter, voltmeter, and other specification parameter adjusting devices shall be inspected periodically. When the aforesaid meter and metering device fail to function, welding shall not be performed. SMAW and GTAW welder must be collectively placed in the weld machine shed, near by the weld zone, the automatic weld machine to be placed according to the site needs. The weld machines shed must be kept well ventilated, dry and easy maintaining.

3.3焊接材料

Welding materials:

焊接材料应具有产品质量证明文件，符合现行国家标准的规定，且实物与证明书上的批号相符，外观检查时，焊条的药皮不得有受潮、脱落或明显的裂纹；焊丝在使用前应清除其表面的油污、锈蚀等；埋弧自动焊丝、焊剂必须放在干燥处妥善保管；低氢型焊材需按照批次、规格不同，分别取样送有资质试验室进行熔敷金属的扩散氢含量检测，

扩散氢含量以不超过4mg/100g为合格。

Welding materials shall have certificate of qualification and shall meet the stipulations of the current national standard, and lot number on the material package shall conform to the certificate; Electrode shall be free of moisture, falling or apparent crack during visual inspection; Welding wire shall be free of oil stain, rust stain and so on prior to usage; Submerged automatic arc welding wire and flux shall keep in a dry place properly;

焊接材料入库前检查其装箱单，出厂质量证明书等文件，检查焊材包装等情况及核对标识后方可入库。焊材入库后应根据焊材种类、型号、批号分类存放，存放焊材的库房应干燥、退风，库内温度应大于50℃，相对湿度不大于60%；焊材应放在焊材架上，离开地面和墙壁的距离不小于300mm，应安放湿度计并做好记录。

Before receiving welding materials, it is required to check its packing list, leave-factory quality certificate and other documents, welding material packages, and identifications. When the welding material is received, it shall be stored as per its category, type, and batch number respectively, and the welding material storage room shall be dry, ventilated, room temperature shall be larger than 50C, relative humidity shall not be larger than 60%; welding materials shall be put on the welding material support, its distance to the ground and wall shall not be less than 300mm, and humidity meter shall be installed and its reading shall be well recorded.

焊接材料设专人保管，掌握焊材库的温度、湿度状况及焊材库存量、出库量，并必须设去湿剂。

Welding materials shall be kept be designated person, temperature, humidity, inventory, distribution amount of the welding material storage room shall be mastered, and the de-wetting agent shall be used.

焊条和焊剂烘干设专职烘干员，并按厂家说明书要求进行烘烤，如无规定按下表要求烘烤。在使及过程中保持干燥，焊条烘干数量要有计划，根据工程的进展情况，适量的进行烘干。烘干时，要经常打开通风孔并打开风扇，驱除潮气，焊条、焊剂放进或取出时，干燥箱内温度不得低于200℃；烘干合格后的焊条放入恒温箱内。焊工取焊条时，必须携带焊条筒，随用随领。同一焊条筒内不准放入两种不同规格的焊条，以免用错。当湿度为80%-90%时，使用时间不超过2小时。湿度小于80%时，使用时间不超过4小时，超过这些时间，应按规定重新烘干，焊条再烘干的次数，一般不超过2次。烘干焊条要使用远红外线式焊条烘干箱和保温箱，箱内不得烘干除焊条、焊剂以外的物品，干湿温度计要定期校验。焊条烘干员应及时做好《焊条烘干记录》、《焊材发放记录》、《焊材库温湿度记录》，记录时写全焊材的使用部位、材料名称、牌号、批号等内容。对于回收的焊条，应分类存放，重新烘干，不得与未使用的焊条混放。

The designated person shall be arranged to ne responsible for drying electrode and flux, and it shall be dried as per the instruction of the manufacturer, if no stipulation is made, below table shall be followed. During usage process, it is required to keep dry, the electrode shall be dried as per the scheduled quantity, and drying operation shall be properly made as per the project progress. During drying process, vent shall be opened and fan shall be used frequently to remove moisture; when electrode and flux are used, temperature in the dryer shall not be less than 200℃; After it is dried thoroughly, the electrode shall be put into thermostat. When the welding operator takes out the electrode, quiver must be carried for placing the electrode. The same quiver shall not be placed with electrode of different specification so as to avoid misapplication. When the humidity is 80%-90%, usage time shall not be more than two hours. When the humidity is less than 80%, the usage time shall not be more than four hours, otherwise, it shall be dried again, but the drying times for the electrode shall not be more twice in general. It is required to use far-infrared electrode drying oven and incubator to dry the electrode,

beside electrode and welding flux, no other article is allowed to be dried in the oven, and dry and wet bulb thermometer shall be calibrated periodically. The electrode drying responsible person shall make Electrode Baking Record, Electrode Issue Record, and Temperature and Humidity Record of Welding Material Storage. Application position, vendor name, brand no., and furnace number of the welding material shall be recorded clearly. The recovered electrode shall be stored as per its classification and dried again, and it is forbidden to put it with the unused electrode together.

药皮受潮、脱落或有明显裂纹的焊条不得使用，焊丝在使用前应清除表面的油污、锈蚀等。

If the coating is moisture, dropped, or significant crack exists, the electrode is not allowed to use; prior to application of welding wire, grease, rust, and other defects shall be removed from its surface.

4 焊前准备

4 Weld Preparation

4.1 坡口形式

4.1 Groove Type

4.2熔盐罐各部位焊接方法

4.2Welding various parts of molten salt tanks

4.3焊接注意事项

4.3 Welding attenation

4.3.1设计图纸中除注明者外，其余角焊缝的焊脚高度均等于两相焊件中较薄件的厚度，且须为连续焊。

4.3.1Unless otherwise noted in the design drawing, other fillet weld's weld joint height shall be equal to the thinner part of the two welded parts, and continuous welding is

required.

4.3.2凡参加储罐焊接的电焊工必须经劳动部门的考试合格并有相应项目和位置焊工担任。

4.3.2Welders who engaged in the storage tank welding must pass the examination of the labor department, and the welding work shall be performed by the welder with corresponding project and position.

4.3.3定位焊应由合格焊工施焊，焊接工艺要求与正式焊接相同。引弧和熄弧不应在母材或完成的焊道上，正式焊接前应将定位焊缝两端修磨成缓坡，保证接头的质量，定位焊长度不小于50mm。

4.3.3Tack-welding shall be performed by the qualified welder, and the welding process requirements shall be identical to formal welding requirements. Run-on tab and run-off tab shall not be applied in parent material or the completed weld pass, prior to formal welding, it is required to trim and grind both ends of the tack weld into slow slope so as to ensure the joint quality, and the tack weld length shall not be less than 50mm.

4.3.4焊缝组装前应清除坡口表面及两侧各20mm范围内的泥沙、铁锈、水分和油污，并充分干燥，露出金属光泽。

4.3.4Prior to assembling weld, bevel surface and 20mm of both sides shall be free of sediment, rust, water, and grease, it shall be fully dried, and it is required to have the metallic luster.

4.3.5焊接中应保证焊道始端和终端质量，始端采用后退起弧法，终端应填满弧坑，多层焊的接头应错开。

4.3.5It is required to ensure starting and finishing end of each weld pass are qualified, the starting end adopts backward arc striking method, the finishing end shall have the crater filled fully, and joint of multilayer welding shall be staggered.

4.3.6双面焊的焊缝背面焊接前，当采用碳弧气刨清根时，应修整刨槽并磨除渗碳层。所有角接及T型接头焊缝，至少焊两遍完成，接头错开，圆滑过渡；板厚大于或等于6mm的搭接角焊缝，至少焊两遍。

4.3.6All corner joint and T joint welds shall be welded at least twice, joints shall be staggered and rounded off; if the plate thickness is larger than or equal to 6mm lapped fillet weld, it shall be welded twice at least.

4.3.7焊接环境出现下列情况之一时，必须采取有效防护措施，否则禁止施焊。

4.3.7If one of following welding condition occurs, effective preventive measures shall be taken, otherwise, it is forbidden to execute welding.

a．手工电弧焊时风速大于8m/s；

b．气体保护焊时风速大于2m/s；

c．大气相对湿度大于85%；

d．雨、雪、大雾环境。

a.When manual arc welding is performed, wind speed is larger than8m/s;

b.When gas shielded welding is made, wind speed is larger than2m/s;

c.Relative humidity of atmosphere is larger than85%;

d.Rain, snow, and fog occur.

4.3.8如出现上述现象时，应针对各条采取以下措施：搭设防风、防雨棚，对初始焊道100mm 内加热，保持焊道干燥；以上措施必须满足此条要求，否则不得施焊。 4.3.8If the above phenomena occur, following measures shall be taken correspondingly: set up wind proofing and rain proofing shed, heat the initial welding pass within 100mm, and keep the welding pass dry; the aforesaid measures must satisfy this requirement; otherwise, execution of welding is not allowed. 5 施工工序 5 Construction process

组装、焊接其余

6 熔盐罐底板组对焊接

6 Assembly welding for tank bottom plate

罐底由中幅板和边缘板组成，罐底板焊缝均采用对接焊。基础验收合格后,确定方位画出中心线，得出中点、画出垫板、边缘板安装位置线，其中边缘板安装铺设按设计直径和基础坡度长度外加收缩余量来确定半径。边缘板之间铺设间隙外侧为8-10mm，内侧为12-14mm。

Tank bottom is composed of center plate and edge plate, the tank bottom plates are all butt welded, before laying the bottom plates, its lower surface should be painted with anti-corrosion coatings, leaving 50mm range of the edge. After foundation inspection & acceptance, the position shall be determined to draw the center line, so as to find the midpoint, draw the mounting position lines of backing board and edge plate, wherein the radius of edge plate mounting and laying is determined as the design diameter and foundation slope length plus shrinkage allowance. The laying gap of edge plates is 6mm of outside and 8mm of inside.

6.1 罐底边缘板焊接

6.1 Weld tank bottom plate

6.1.1弧形边缘板的对接焊采用手工焊。先焊其外侧300mm焊缝，打底焊后进行渗透检查，以第二层开始每层错开50～70mm，焊接完成后上部磨平。为控制焊接引起的角变形，将坡口处用夹具向上提起6～8mm。

6.1.1Manual welding is applied for the butt welding of curved edge plates. First, the outside 300mm weld joint shall be carried out, with penetration inspection after backing welding. Starting from the second layer, each layer shall shift 50～70mm, after welding is completed, the upper part shall be grinded flat. To control the angular distortion caused by welding, the end bevel shall be lifted 6 ~ 8mm up with clamp.

6.1.2边缘板剩余对接焊缝的焊接，焊工应对称分布每隔600mm 隔缝跳焊600mm ，焊缝表面应光滑平整，焊接应加防变形板。

6.1.2For the welding of edge plates butt weld seam, the welder should do the skip sequence welding of 600mm in symmetrical distribution of 600mm.Weld surface should be smooth and anti-deformation plate should be added.

Anti-deformation plate

6.2中幅板焊接

6.2 Center plate welding

6.2.1 中幅板的焊接，采用CO2气体保护焊打底，埋弧自动焊盖面焊接成形。

6.2.1 The welding of center plate uses CO2 gas shielded welding for backing, with submerged automatic arc welding and cosmetic welding.

6.2.2底板中幅板按照先短后长的顺序进行焊接，初层焊道采用分段退焊法施焊。6.2.2 The plate in the bottom plate is welded according to the order of the initial length and the long post, and the primary bead is welded by subsection back welding method.

6.2.3中幅板铺设时，按照排版图从中心向四周铺设，边缘板依安装位置线铺设，垫板与相邻两块底板中的一块先点焊，底板与垫板应贴紧，其间隙不大于1mm。

6.2.3 When laying the center plates, it should be done according to the layout diagram from the center to the edges, with backing plate and one of two adjacent bottom plates spot welded first, the bottom plate and backing plate should be tightly against each other, with the gap not greater than 1mm.

6.2.4中幅板组对时,其间隙控制在6±1mm之间。底板与垫板之间的点焊应按焊接技术措施规定的次序严格执行。

6.2.4 When fitting up the center plates, the gap should be kept between 4-6mm. Spot-welding between the base plate and backing plate should be carried out according to the sequence provided in welding technical specifications strictly.

6.2.5 罐底板中幅板焊接时，按下图顺序进行：

按照上图所示焊接顺序和方向进行分段倒退跳焊，同一组内的焊缝同时焊接，分段长度要一致，焊接层数相同，焊接电流和焊接速度一致，层与层之间的焊接接头要错开，另外中幅板之间丁字口区域200mm预留不焊，待长、短缝自动焊完成后用手工焊接完成。

6.2.6 罐底板焊接时，须采取以下防变形措施：

6.2.6 When doing the tank bottom plate welding, the following anti-deformation measures should be taken:

6.2.6.1焊接短缝时，应在焊缝的两端离边缘150mm处打上背板（背板长度不小于600mm，宽度不小于150mm ）。

6.2.6.1When carrying out short seam welding, back panel (with length not less than 600mm and width not less than 150mm) shall be set at 150mm from the edges at both ends of the weld seam.

6.2.6.2焊接长缝时，用龙门板将[20号槽钢固定于焊缝两侧，离焊缝200mm并卡紧。

6.2.6.2When carrying out long seam welding, batter board is used to fix the[22 channel on both sides of the weld, 200mm from the weld, and clamped firmly.

6.3 边缘板剩余对接缝的焊接

6.3 The welding of edge plate remaining butt seams

边缘板剩余的对接缝焊接应在大角焊缝焊接完毕后，收缩缝（中幅板与边缘板的搭接焊缝）焊接之前进行，采用手工电弧焊进行焊接。焊接时由多名焊工对称均匀分布，隔一条缝焊一条，焊接方向由外向内，初层焊可采用分段跳焊法。焊接前将垫板与2块边缘板进行点固，间隙小于1mm，未焊接的焊缝不得将2块边缘板都与底板点焊。焊接时应采用背杠与卡具进行加固。

The remaining butt seam welding of edge plate shall be carried out after the full fillet weld is completed, before the welding of contraction joints (the lap welds of center plates and edge plates), using manual arc welding. A number of welders shall be symmetrical evenly distributed, separated by a weld seam, with the welding direction from outside to inside, and the primary layer welding can adopt the method of segmented wandering sequence . Before welding, the backing plate and two edge plates shall be tack welded, with the gap less than 1mm, the two edge plates and bottom plate

of non-welded seam shall not be spot welded. Fixture and back panel should be used for reinforcement in welding.

6.4 收缩缝（龟甲缝）的焊接

6.4 Welding of contraction weld (tortoise-shell seam)

收缩缝为整个底板的最后一条焊缝，收缩缝的焊接采用埋弧自动焊机焊接，焊前应将边缘板与中幅板之间的卡具松开或磨开定位焊点，焊工应沿圆周均匀分布，分段跳焊Contraction joint is the last weld of the whole base plate. The welding of contraction joint uses automatic submerged fillet arc welding machine, the fixture or the tacked spot between edge plate and center plate shall be loosened or removed before welding and the welding operator shall be evenly distributed circumferentially to carry out segmented skip welding.

6.5 罐底板真空试漏

6.5 Tank bottom plate vacuum leakage test

罐底焊接完毕，检查凹凸度，凹凸变形的深度不应大于变形长度的2% ，且不应大于50mm ，并对所有焊缝进行真空试验。试漏时，先在焊缝表面涂肥皂水，用长方形真空箱压在焊缝上，真空箱底部四周用玻璃高密度海绵密封，用胶管与真空箱泵相通，通过真空箱上盖装有的密封有机玻璃观察箱内渗漏情况，当箱内真空度达到0.053MPa 时，若焊缝表面无气泡出现，证明焊缝无泄漏，即为合格，如发现气泡应立即作好标记，必须用砂轮将缺陷表面磨开，明确渗漏原因后方可修补，坚决不可在缺陷表面进行修补，修补后重新试漏。

After tank bottom welding is completed, check the degree of unevenness, uneven deformation depth should not exceed 2% of the length of the deformation, and not greater than 50mm, and vacuum test shall be carried out on all welds. When doing the leakage test, first apply soapy water on the weld surface, place a rectangular vacuum box on the seam, with the around of box bottom sealed with glass high-density foam, using a hose to connect with vacuum box pump, observe the leakage status inside the box through the sealed plexiglass in the tank top cover, when the inside vacuum reaches 0.053MPa, if no bubbles shown on the weld surface, it proves that without leakage, the weld is qualified, if bubbles are found, it should be immediately marked, using the wheel the open to grind the defected surface, the repair can only be carried out after the cause of leakage is cleared. It is strictly forbidden to carry out the repairing just on the defected surface, and leakage re-test shall be carried out after repairing.

空箱

空泵

表

表

注：压力表Pressure gauge 焊缝Weld 真空箱Vacuum tank 胶皮管Flexible hose 真空试验示意图Schematic diagram of vacuum test

7 熔盐储罐壁板的焊接

7 Welding of tank shell

熔盐储罐壁板安装采用倒装法进行，即先安装顶圈壁板及拱顶，然后壁板依次向下安装焊接，最后安装焊接底圈壁板及大脚焊缝。根据这种安装方法，壁板立缝、环缝采取先焊外侧，然后内侧搭设临时操作平台进行焊缝清根和焊接工作。立缝内外侧均采用气电立焊，环缝外侧采用自动焊，内侧手工电弧焊。

7.1 顶圈壁板的焊接

7.1 Welding of tank top shell

顶圈壁板组对完毕后先进行纵缝焊接，焊接方法采用气电立焊，先焊接大坡口，后焊小坡口，然后利用内侧操作平台对焊缝进行清根，清根可采用磨光机或碳弧气刨，但刨后应用角向磨光机将刨槽内的渗碳层和杂物打磨干净。（10mm和16mm壁板可一次焊接成型）为了便于环缝的装配，各条纵缝的上下端各留出150mm，暂不焊接，待环缝装配后再焊接。

After the top ring wallboard is assembled, vertical seam welding shall be performed first, with welding method of manual welding, if the direction of the bevel is at the outside of the wallboard, two backing welding outside the wallboard shall be carried out first (if inside, the welding sequence would be opposite), and then clear the weld root at the back, which can use grinder or carbon arc gouging, but after gouging, angle grinder shall be used to clean the carburized layer and debris. （The shell plate of 10mm and16mm can be welded at once time.）In order to facilitate the assembly of circular seam, 150mm shall be set at the upper and lower ends of each longitudinal seam, and welded after the circular seam assembly.

7.2 其余各层壁板的焊接

7.2 The welding the remaining wallboard of each layer

7.2.1其余各层壁板焊接先焊纵缝，再焊环缝。纵缝焊接前，先焊上定位龙门板，然后拆下纵缝组对卡具，16mm 及以上的壁板纵缝为x型坡口，其余v型坡口。焊接时，先焊外侧，然后内侧清根焊接。

7.2.1For the welding of remaining layers of wallboards, longitudinal seam shall be welded first, and then circular seam, before longitudinal seam welding, the positioning batter board shall be welded, and then the longitudinal seam assembly fixtures shall be removed. 16mm and above wallboard longitudinal seam is x-shape bevel and the rest is v-shape bevel. When welding, the outside shall be welded before inside.

7.2.2壁板环缝的焊接，采用埋弧自动焊和手工焊，焊接程序：先埋弧自动焊焊接外侧，多台埋弧焊机均布同时沿同一方向进行施焊。然后反面进行清根，清根方法同前。然后用手工焊焊接内侧焊缝

7.2.2Welding procedure: first the outside weld with the SAW, then clean the root at the back, with the same method stated above. Then weld inside with SMAW.

7.2.3罐壁板厚度自下而上分别为δ= 42 、34 、25 、16 、10mm共计5圈，采用电动葫芦提升倒装法组装。拆除组装用的工卡具时，不得损伤母材。如有损伤，应按标准进行修补。钢板表面的焊疤应打磨平整。

7.2.3The thickness of tank shell from the upper to the lower is δ= 42, 34, 25, 16 and 10mm with 5 circles in total, the tank shells are installed by means of electric hoist lifting upside-down method. The tooling and clamp shall be disassembled without wearing the base material. If there is any damage, it shall be repaired as per the standards. The crater of the steel plate surface shall be ground to a smooth, uniform finish.

7.2.4组对壁板时，间隙应符合焊接工艺要求。罐壁焊接应先焊纵缝，在上下纵缝全部焊接完后，再焊环缝。环缝焊接时，应采用数台焊机均布施焊。先焊接外侧焊缝，并用电弧气刨清根后，再用手工电弧焊进行内侧焊缝的焊接。

7.2.4When the shell is assembled, clearance shall conform to the welding process requirements. When the tank shell is welded, longitudinal seam shall be welded firstly, and circumferential seam shall be welded after the top and the bottom circumferential seams finish welding. When the circumferential seam is welded, several sets of welding machine shall be used to weld uniformly. The outer welding seams will be welded at first, the back chipping will be done by means of electric arc gouging and then the inner welding seams will be welded with SMAW.

7.2.5为防止焊缝角变形，除应严格执行焊接工艺外，尚应设置必要工装，做好防变形措施。

7.2.5To avoid the deformation of welding seam angle, the welding process should be performed strictly, necessary tooling should be set up and measures for anti-deformation should be taken as well.

7.3大角焊缝的焊接

7.3Welding of Bighorn weld

7.3.1底圈壁板和底板边缘板外缘300mm焊接完成后，进行大角焊缝的焊接。焊接采

用焊条电弧焊打底，埋弧自动焊盖面的方法。焊接坡口形状如下图所示：

7.3.1The bighorn weld should weld after the last shell plate and the 300mm outside of the annular plate finishing. The weld method is GMAW and SAW. The welding groove shape as follow:

7.3.2由于底圈壁板厚度与底板边缘板厚度相差较大，且坡口为全焊透，因此焊接过程中产生的角焊缝变形也比较明显，为了防止产生较大的焊接变形量，因此在焊接过程中需要采取相应措施。焊接工装如下图所示：

7.3.2Since the large thickness difference between the last shell plate and the annular plate, and the groove is full penetration, the welding deformation of the fillet is more obvious. In order to prevent the welding deformation of the fillet, so the welding process needs to take corresponding measures. Welding tooling as shown below:

a.壁板两侧与底板边缘板用角钢做斜撑，来防止底板边缘板翘起与起鼓。

https://www.360docs.net/doc/5314195182.html,e the angle iron to be bracing between the both sides of the shell plate and the annular plate to prevent the annular to tilt.

b.底板边缘板与垫板之间点焊，且点焊焊缝应尽可能长，来防止右侧底板边缘板翘起。

b.The annular plate and the backing plate should be spot welded to prevent the right side of the annular to tilt.

c.焊接顺序为先焊大坡口一侧，后焊小坡口。

c.Weld the side of the big groove first, and then the small groove.

d.焊接由多台埋弧焊机均布同时沿同一方向进行施焊。

d.Make numbers of submerged arc welding machine weld in the same direction at the same tim

e.

8 拱顶的焊接

8 Welding of vault

8.1拱顶的安装是在罐壁顶圈壁板已安装焊接的条件下进行的。顶圈壁板焊接完成后，进行坠板的焊接。

8.1 dome is installed in the tank wall under the top ring wall installed welding carried out. After the top ring wall welding is completed, perform fall plate welding.

8.2拱顶板与加强筋预制完成后，在预制场完成拱顶板与加强筋的焊接工作。然后在临时支撑安装完成后，将拱顶板与加强筋的预制件整体吊装在临时支撑上进行预制焊接。

8.2 dome plate and stiffener prefabricated, precast yard completion in the dome plate and stiffener welding work. After the temporary support then installation is complete, the dome plate and stiffener preforms integral lifting prefabricated welded on temporary support.

8.3已安装的拱顶的焊接程序为：先焊接扇形大板间的纵向焊缝，再焊接中心板与各

扇形大板内沿间的环缝，后焊接扇形大板外沿与罐壁环形角钢圈间的环缝。拱顶的焊接拟采用二氧化碳保护焊，纵向缝施焊时宜由多名焊工采用跳焊法对称同时焊接；外沿环缝施焊时宜由多名焊工均布，同时沿同一方向焊接。

8.3 Dome welding procedures installed as follows: first longitudinal seam welded large sector between the plates, center plate and then welded in each sector girth along the board between the outer edge of the board after the welding sector with the tank wall ring angle girth ring between. Dome welding intends to use carbon dioxide arc welding, longitudinal welding seam welder when advised by a number of symmetric skip welding Simultaneous welding; seam welding at the outer edge of the ring should be evenly distributed by a number of welders, welding simultaneously in the same direction.

8.4顶板在设置短桅杆部分预留出1000*1000mm的空间，待罐顶提升高度超过桅杆高度后补设安装完成

8.4A space of 1000x1000mm should be reserved at the short mast part of the top plate. The reserved space should not be installed until the hoisting height of tank top has exceeded the height of mast.

9焊缝的修补

9 Repair weld

9.1 深度超过0.5mm划伤、电弧擦伤、焊疤等有害缺陷，应打磨平滑。打磨后的钢板厚度不应小于钢板名义厚度扣除负偏差值；缺陷深度或打磨深度超过1mm时，应进行补焊，并打磨平滑；焊道内部的超标缺陷在焊接修补时，应探测缺陷的埋置深度，确定缺陷的清除面，修补长度不应小于50mm，高强钢钢板修补长度不应小于100mm；清除的深度不应大于板厚的2/3当采用碳弧气刨时，缺陷清除后应修磨刨槽，返修的焊缝按原规定的方法进行无损检测，并达到合格标准。

9.1The depth of scratch, scuffing by electric arch, welding scar, crater defect and other defects exceeding 0.5mm should be polished and smoothened. The thickness of polished steel plate should not be less than the nominal thickness where the negative deviation is taken off. When the defect depth or the polishing depth exceeds 1mm, the make-up welding should be conducted and polished. When the unacceptable defects inside the welding beams are repaired, the submerged depth of the defects should be detected to specify the defects on the removal face, and the repairing length shall not be less than 50mm, and the repairing length for high-strength steel plate shall not be less than 100mm. The removal depth is not allowed to exceed 2/3 height of the plate thickness. When the carbon arch gouging applied, the gouging slot should be trimmed after the defects are removed. The non-destructive testing should be carried on the weld to be repaired as per the specified methods, with the goal to meet the qualification standard.

9.2 焊接修补的应按照焊接工艺进行。

Weld repairing work shall be performed as per the welding procedure.