【正文】 tight. 瓜皮板預(yù)制成型后，用弧形樣板檢查，其間距不得大于 10mm； Check the domed roof plate with arc templet after formation and its gap is less than 10mm。 加強肋接頭部位必須完全焊透； Reinforce rib tie shall be perative welded。 瓜皮板自身拼接采用對接接頭，并采用雙面焊接； Weld of domed roof plates adopts butt weld. When assemble with many pieces of plates according to specification of material delivered, domed roof plates shall be formed on platform and adopts bothside welding, plates shall be smooth after welding. 瓜皮板下料前按施工圖放大樣，確認無誤后方可切割； Confirm domed roof plates and cut they according to amplified construction sample drawing before construction。 壁板坡口用坡口機加工，縱縫坡口尺寸按圖紙要求進行，環(huán)縫開單面 V 坡口。為了防止產(chǎn)生直板可加帶頭板。 2 177。 177。 包邊角鋼對接接頭與壁板縱向焊縫之間的距離不得小于 200mm； The distance between angle iron butt weld joint and shell longitudinal weld joint is not less than 200mm。 底圈壁板的縱向焊縫與罐底邊緣板對接焊縫之間的距離不得小于 200mm； The distance between longitudinal weld joint of bottom shell and butt weld joint of tank bottom baseplate is not less than 200mm。 2 A E B D C F A E B C F D 上海 SECCO90 萬噸 /年乙烯工程 26 萬噸 /年丙烯腈 (AN)裝置 儲罐安裝 \焊接施工方案 中國石化集團第五建設(shè)公司 Page 8 of 34 上海工程項目部 對角線 diagonal ∣ ADBC∣ ≤ 3 壁板預(yù)制 Prefabrication of shell plate 壁 板預(yù)制前應(yīng)繪制排板圖，并符合下列規(guī)定： Draw typesetting sketches of shell plate before prefabrication the shell and ply with following: 各圈壁板的縱向焊縫向同一方向逐圈錯開，其間距宜為板長的 1/3，且不得小于500mm； Longitudinal weld joint on each shell shall stagger in same direction。 邊緣板下料切割后尺寸允差 Allowance deviation of baseplate is specified as following: 測 量 部 位 Measure location 允許偏差 Allowance (mm) 長度 Length AB、 CD 177。 length is not less than 2020mm。 邊緣板沿罐底半徑方向的最小尺寸不得小于 700mm； The minimum size of rim plate along the direction of tank bottom radius is not less than 700mm。 Rim plat and channel plate can be cut in oxyacetylene torch if material is CS. Rim plat and channel plate can cut in plasma if material is stainless steel, Oxidation layer shall be removed after cut. 先繪制底板排板圖。切割后應(yīng)打磨表面氧化層。在存放、運輸時采取防變形措施，對罐壁板、頂板等，用胎架運輸、存放； For the transportation and storage of fabricated members shall take measures to avoid distortion. For shell and top plate shall adopt padding rack to transport and store。弧形樣板上注明儲罐位號、名稱、樣板名稱及其規(guī)格，要妥善保管。 弧形樣板用 ~ 鐵皮制作，樣板周邊光滑、整齊。 Chord length of arc templet is not less than 1m， if curvature radius less than . 直線樣板的長度不得小于 1m； Linear templet length is not less than 1m。 Bitumen sand layer surface shall be level and hard and have no nose, groove, crack. Make circles, their centers are foundation center and diameters are D/4,D/2,3D/4,and divide the circles into 8,12,24 parts, then measure Bitumen sand layer elevations at dividing points. The difference of measured elevation and calculated elevation is less than 12mm. 5. 預(yù) 制 Prefabrication of storage tank 樣板的制作 Fabrication provision of templet: 弧形樣板的弦長，當構(gòu)件的曲率半徑大于 時，不得小于 2m；當構(gòu)件的曲率半徑小于等于 時，不得小于 。其測量標高與計算標高之差不得大于 12mm。稀硫銨溶液罐的直徑 ，大于 25m，以基礎(chǔ)中 心為圓心，以 D/ D/ 3D/4 直徑作圓，將各圓周分成 1 24 等分，在等分點測量瀝青砂層的標高。 height difference between arbitrary two points in entire circle is less than 13mm。 20mm。 基礎(chǔ)中心標高允許偏差為177。 The materials that are checked and eligibility shall be classstored accordance with their materials, types and specifications. Transportation and convey of plate material and profiled material shall take measures to avoid permanent distortion and nick. 4. 基礎(chǔ)驗收 Re—check the foundation 貯罐安裝前應(yīng)辦理基礎(chǔ)交接手續(xù)，基礎(chǔ)施工單位應(yīng)提供工序交接證書，我們做基礎(chǔ)復(fù)測。所有板材、型材等的搬運、存放，都應(yīng)采取防止產(chǎn)生永久變形、劃傷和銹蝕的措施，尤其預(yù)制壁板要放在托架上。 Each of steel plate shall be checked with the appearances and has no defects, such as sediment, replicate, air vent, etc. 鋼板表面銹蝕減薄量，劃痕深度與鋼板實際負偏差之和，不得超過下表規(guī)定。 Material 304L and 316L is austenitic stainless steel, it have counteraction corrosive well in some oxidation medium (nitric acid) or some revivification medium (vitriol) and formic acid and otherwise anic acid. It’s mechanics performance characteristic is toughness very good, but intensity and rigidity low. 上海 SECCO90 萬噸 /年乙烯工程 26 萬噸 /年丙烯腈 (AN)裝置 儲罐安裝 \焊接施工方案 中國石化集團第五建設(shè)公司 Page 3 of 34 上海工程項目部 編制依據(jù) Preparation Basis 國家及行業(yè)標準、規(guī)范 standards and specification 《立式圓筒形鋼制焊接油罐施工及驗收規(guī)范》 GBJ12890 《 Code for Construction and Acceptance of Vertical Cylindrical Steel Storage Tank》 《石油化工立式圓筒形鋼制儲罐施工工藝標準》 SH/T35302020 《 Standard for Construction Technology of Vertical Cylindrical Steel Petrochemical Storage Tank》 《石油化工鋼儲罐地基充水預(yù)壓監(jiān)測規(guī)程》 SH/T31232020 《 Specification for Monitoring of Water Filling Prepressure Test of Steel Petrochemical Storage Tank Base》 《壓力容器無損檢測及第一號修改單》 JB473094 《 Pressure Vessel NDE and Revision List》 《現(xiàn)場設(shè)備、工業(yè)管道焊接工程施工及驗收規(guī)范》 GB5023698 《 Code for Construction and Acceptance of Field Equipment and Industrial Piping Welding Engineering》 《鋼制常壓焊接容器》 JB/T473595 《 Steel Welded Atmospheric Pressure》 設(shè)計交底記錄 Design make clear summary 上海 SECCO 有關(guān)技術(shù)文件 Shanghai SECCO related technical documents 焊接儲罐標準 （ SD00TSCMS0015A00） Standard for welded storage tanks 施工圖紙 construction drawings 說明 ：當在項目執(zhí)行過程中，中國政府法規(guī)、 SECCO 項目規(guī)定及標準、規(guī)范間有矛盾時，執(zhí)行的順序應(yīng)當是： SECCO 項目規(guī)定、標準和規(guī)范要求、中國政府法規(guī)。由于奧氏體不銹鋼的導(dǎo)熱系數(shù)小，僅為碳鋼的 1/3，而且線膨脹系數(shù)大，比碳鋼大 40%以上，所以焊接時容易變形。 Tools and gripper should lay a piece of stainless steel plate if contact stainless steel plate. 材質(zhì) 304L（ 00Cr19Ni10）、 316L（ 00Cr17Ni14Mo2） 是奧氏體不銹鋼，其在氧化性介質(zhì)（如硝酸），某些還原性介質(zhì)（如硫酸）和蟻酸等有機酸中均有良好的耐蝕性，同時還具有無磁性。上海 SECCO90 萬噸 /年乙烯工程 26 萬噸 /年丙烯腈 (AN)裝置 儲罐安裝 \焊接施工方案 中國石化集團第五建設(shè)公司 Page 1 of 34 上海工程項目部 目 錄 1. 概 述 General ..................................................................................... 2 Construction process ................................................................ 3 3. 材料驗收 Acceptance of the material ...............................