2. Construction Program holes of flanges shall be installed with bolts symmetrically.
e) 总体几何尺寸检查 Overall geometric dimension inspection:
? 罐壁高度的允许偏差,不应大于设计高度的0.5%。The allowable deviation of tank
wall height shall not be greater than the design height by 0.5%
? 罐壁铅垂的允许偏差,不应大于罐壁高度的0.4%,且不得大于50mm。The allowable
deviation of tank wall verticality shall not be greater than the tank wall height by 0.4% and ≤50mm.
? 罐底焊接后,其局部的凹凸变形的深度,不应大于变形长度的2%,且不应大于50mm。
After tank bottom welding, its local concave and convex deformed depth shall not be greater than the length of deformed part by 2% and ≤50mm.
3.4.5 储罐试验 Storage tank test
a) 临时给排水铺设； Temporary water supply and drainage prepared ready. b) 罐内清理；Internal cleaning of tanks
c) 接口管使用盲法兰临时封闭；Nozzles are closed temporarily with blind flange. d) 盛水试验，同时完成基础沉降观测。Water filling test, simultaneously completion of
foundation settlement observation.
? 充水试验前，所有附件及其它与罐体焊接的构件，应全部完工； All the accessories
and structure parts welded to tank shall be completed prior to water filling test. ? 充水试验用水氯离子含量不应超过25ppm，试验水温不低于5℃；For water used for
filling test, the contents of chloride ion is no more than 25ppm, the temperature of testing water is no less than 5℃.
? 充水试验检查罐底的严密性、罐壁强度及严密性、固定顶的强度、稳定性及严密
性、基础的沉降观测。Water filling test is to inspect the tightness of tank bottom, the tightness and strength of tank wall, the strength, stableness and tightness of fixed roof, and observe the foundation sedimentation.
? 罐底的严密性，应以充水试验过程中罐底无渗漏为合格。若发现渗漏，应进行补
焊。In case of no leakage occurrence during water charging, the tightness of tank bottom is qualified. If leaked, weld repair shall be done.
? 罐壁的强度及严密性试验，应以充水到设计最高液位并保持48小时后，罐壁无渗
漏、无异常变形为合格。发现渗漏时应放水，使液面比渗漏处低300mm左右，并
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Project Title：Storage Tanks for Jilin Hydrogen Peroxide Project
2. Construction Program 进行补焊。In case of no tank wall leakage and abnormal deformation occurred within 48 hours after water charged to the designed level in the tank, the strength and tightness of tank wall is tested qualified. If leaked, the water is discharged to the level lower than the leaked point by about 300mm and additional welding is executed.
? 固定顶的强度及严密性试验，罐内水位应在最高设计液位下1m进行缓慢充水升
压，当升至试验压力时，应以罐顶无异常变形，焊缝无渗漏为合格。试验后，应立即使储罐内部与大气相通，恢复到常压。引起温度剧烈变化的天气，不宜做固定顶的强度、严密性试验和稳定性试验。To test the strength and tightness of fixed roof, when the water level of tank is at the point lower than 1m of highest design level, the tank is slowly water charged. In case of test pressure reached and no tank roof deformation and welds leakage occurred, the tightness and strength is qualified. If substantial temperature changes exist due to weather variation, it is not allowed to have fixed roof strength, tightness and stableness tests.
? 固定顶的稳定性试验应充水到设计最高液位用放水方法进行。试验时应缓慢降压，
达到试验负压时，罐顶无异常变形为合格。试验后，应立即使油罐内部与大气相通，恢复到常压。The water is charged to the max design level and discharged afterwards to test the stableness of fixed roof. During test, the pressure shall be reduced gradually. If reaching negative pressure and no tank roof deformation, it is regarded as qualified. After testing, the tank is ventilated with air immediately and resumed to normal pressure.
? 充水试验中应进行基础沉降观测。在充水试验中,如基础发生不允许的沉降,应停止
充水,待处理后,方可继续进行试验。During water filling test, the foundation sedimentation shall be observed closely. During water charging, in case of over foundation sedimentation occurred, water charging shall be stopped. After proper treatment, the test can be resumed again.
? 在罐壁下部每隔10米左右，设一个观测点，点数宜为4的整倍数，且不得少于4
点。An observation point shall be set up at about every 10m at lower part of tank wall and the no. of observation points shall the multiple of 4 and not less than 4 points.
3.4.6 储罐酸洗/钝化Storage tank pickling
根据规范要求，对储罐内壁焊缝进行酸洗并用钢丝刷刷净。To conform with the specifications, the welded seams on the inner wall of tank shall be cleaned by pickling and steel brushing.
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2. Construction Program 3.4.7 储罐封闭 Internal cleaning, drying and protection inside tank
所有施工结束后应将罐内清理干净，并经业主检查认可，方可封闭。When the work is finished, the tank can only be closed after tank inside cleaned by fabricator and confirmed by owner.
3.4.8 储罐交工验收 Storage tank turn over and acceptance
交工验收时应提供所有过程资料和无损检测资料。All the in-process records and NDE report shall be included in the as-built documentation for turnover.
4、储罐焊接方法 Storage tank welding method 4.1 材料 Materials
本体母材：304L Base metal: 304L 接管和管件：304L
Nozzle and pipe fittings: 304L 法兰和锻件：304L Flange and forging: 304L 角钢、扁钢等：304L
Angle steel, flat steel and etc.: 304L
焊材：焊条E308L Φ3.2 Φ4.0 和 焊丝ER308L
Welding material: welding rod E308L Φ3.2 Φ4.0 and welding wire ER308L 4.2工艺 Welding procedure
储罐底板采用手弧双面对接焊；
Manual arc double-side butt welding is to be adopted for base plate of the storage tank; 储罐顶板采用手弧双面对接焊；
Manual arc double-side butt welding is to be adopted for roof plate of the storage tank; 储罐壁板采用手弧双面对接焊；
Manual arc double-side butt welding is to be adopted for wall plate of the storage tank; 储罐壁板与底板焊接采用手弧双面角焊；
Manual arc double-side fillet welding is to be adopted for wall plate and base plate of the storage tank;
接管与储罐采用氩弧单面坡口角焊；
Argon arc single groove fillet welding is to be adopted for nozzle and the storage tank.
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2. Construction Program 法兰与接管采用氩弧对接焊；
Argon arc butt welding is to be adopted for flanges and Nozzle. 接管与补强板采用氩弧单面坡口角焊；
Argon arc single groove fillet welding is to be adopted for nozzle and the reinforcement pad. 补强板与罐壁采用手弧角焊。
Manual fillet welding is to be adopted for the reinforcement pad and tank wall. 4.3人员资格 Welder’s qualification
操作焊工持有压力容器特种作业证，具备横、平、立、仰和管道对接焊（氩电联焊）资格。 The welder shall possess special work permit for pressure vessels and have the qualification of longitudinal fillet welding, horizontal fillet welding, vertical fillet welding, overhead welding and pipe butt welding (SMAW+GMAW).
焊缝组装人员富有制作经验，并具有相应的能力。
The weld assembly personnel shall have rich experience in fabrication, and shall be qualified and certified.
4.4 环境要求 Welding surroundings requirement
焊接环境出现下列任一情况时，须采取有效防护措施，否则禁止施焊；
In case of any one of following circumstances of welding surroundings, effective protection measures shall be taken, otherwise, welding is not permitted. a) 风速：气体保护焊时大于2m/s，其他焊接方法大于8m/s；
Wind velocity: higher than 2 m/s for gas shielded welding and higher than 8 m/s for other welding methods. b) 相对湿度大于90%；
Relative humidity is more than 90%;
c) 雨雪环境；
Rainy and snow surroundings; d) 焊件温度低于5℃。
Weldment temperature is lower than 5℃.
当环境温度低于5℃时，需采取预热措施，预热温度为≥15℃，且最高预热温度应低于150℃。预热区域为始焊处周围100mm内。
It is necessary to take preheating measures when the ambient temperature is lower than 5℃, for which the preheating temperature shall be ≥15℃ and the maximum preheating temperature shall be lower than 150℃. The preheating area shall be within 100 mm around the welding starting point.
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2. Construction Program 4.5 焊缝标识 Marking of weld
焊接完成后应立即进行标识，标识应清晰可辩。标记点距焊缝边缘为20~50mm。
Upon completion of welding, visible marking shall be made immediately. The mark point shall be 20-50mm far from the weld edge.
焊缝标识采用可擦除记号笔标记，焊口号应与焊口排版图的标识一一对应。
The weld mark shall be made with erasable marker and the crater number shall be one-to-one corresponding with marking of crater layout diagram. 标识内容：焊缝号+焊工代号。
Marking items: weld number+ welder’s ID number.
在储罐纵向焊缝中，其标记必须在焊缝开头和尾部中出现，且距环形焊缝100mm，纵向焊缝小于400mm只作一个标记。
Marking of the longitudinal weld of the storage tank must appear at the beginning and ending of the weld, 100mm far from the circular weld. One mark is enough when the longitudinal weld is less than 400mm.
对于储罐环形焊缝其标记应该标注在与纵向焊缝相交处。储罐环向焊缝每一米长或一米以下长度进行焊缝标识。
Marking of the circular weld of the storage tank shall be made at intersection of circular weld and longitudinal weld. Weld marking shall be made for the length of circular weld equal to or less than one meter.
4.6 储罐焊接方法 Welding method for tanks 4.6.1储罐底板焊接方法 Base plate welding method
在所有焊接活动中严禁在坡口外母材的任何地方起弧，以免损伤母材表面。 For prevention of damage to the base metal surface, arc strike at any area of the base metal outside the groove is strictly prohibited. a).坡口（见图一）Groove (see figure 1)
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