1、管子下料

1. Pipe cutting

　　⑴、下料應(ying)嚴格按設計單線圖進行，切割前(qian)材料尺(chi)寸(cun)應(ying)仔細核對。

⑴. Cutting should be strictly carried out according to the design single line diagram, and the material size should be carefully checked before cutting.

　　⑵、下料時(shi)應根據管子長短合理排料，減少浪費。

When cutting, the material should be reasonably arranged according to the length of the pipe to reduce waste.

　　2、坡口(kou)制備要求

2. Requirements for groove preparation

　　管(guan)道連接主要是焊接方式，坡(po)(po)口(kou)(kou)(kou)是焊接的首要條件(jian)，必須按規(gui)范規(gui)定進行(xing)，中、低壓管(guan)道坡(po)(po)口(kou)(kou)(kou)型(xing)(xing)式采用(yong)V型(xing)(xing)，高壓管(guan)道采用(yong)YV(雙V)型(xing)(xing)坡(po)(po)口(kou)(kou)(kou)，坡(po)(po)口(kou)(kou)(kou)加工應平整，不(bu)得有裂(lie)紋、重皮、毛刺和氧(yang)化(hua)鐵等。

The main method of pipeline connection is welding, and the groove is the primary condition for welding, which must be carried out in accordance with the specifications. The groove type for medium and low pressure pipelines is V-shaped, and the YV (double V) groove type is used for high pressure pipelines. The groove processing should be flat, without cracks, double skin, burrs, and iron oxide.

　　3、焊口組對

3. Welding joint assembly

　　管道組對(dui)前(qian)，將接口內(nei)(nei)外表面25毫米(mi)范(fan)圍內(nei)(nei)的泥垢(gou)，油污(wu)、鐵銹等(deng)干凈，用鋼(gang)絲刷或(huo)拖(tuo)布(bu)將管內(nei)(nei)雜(za)物(wu)。對(dui)預制和安裝時未封(feng)(feng)閉的管段，應采取(qu)措施封(feng)(feng)堵管口，避免(mian)雜(za)物(wu)進(jin)入管道內(nei)(nei)。

Before assembling the pipeline, remove any dirt, oil stains, rust, etc. within a range of 25mm on the inner and outer surfaces of the interface, and use a wire brush or mop to remove any debris inside the pipeline. Measures should be taken to seal the pipe openings of unsealed sections during prefabrication and installation to prevent debris from entering the pipeline.

　　4、預制允許偏差

4. Prefabrication allowable deviation

　　5、管(guan)道預制件(jian)應按規定要求(qiu)編號(hao)(hao)(管(guan)線號(hao)(hao)、焊口編號(hao)(hao)和焊工號(hao)(hao))以(yi)便(bian)于質量控(kong)制和安裝時查找。

5. Prefabricated pipeline components should be numbered according to the specified requirements (pipe line number, weld joint number, and welder number) for quality control and easy retrieval during installation.

　　6、預(yu)制完畢的管(guan)(guan)段，應將內部清(qing)理(li)干凈，并及時封(feng)閉管(guan)(guan)口，保證管(guan)(guan)內清(qing)潔。特(te)別指出，本工程(cheng)所有管(guan)(guan)口在安裝前必須全(quan)部封(feng)閉，確保預(yu)制管(guan)(guan)道(dao)進入現場封(feng)堵(du)。

6. The prefabricated pipe section should be cleaned internally and the pipe opening should be closed in a timely manner to ensure cleanliness inside the pipe. It is particularly pointed out that all pipe openings in this project must be completely sealed before installation to ensure that prefabricated pipes enter the site for sealing.

　　7、等厚管道對接(jie)焊口的組對應做到(dao)內壁(bi)齊平

7. Ensure that the assembly of equal thickness pipeline butt welds is flush with the inner wall

　　8、不等(deng)厚管道組(zu)成件組(zu)對時,當內壁錯邊量超(chao)過1.5毫(hao)米或外壁錯邊量超(chao)過3毫(hao)米

8. When assembling components of unequal thickness pipelines, when the misalignment of the inner wall exceeds 1.5 millimeters or the misalignment of the outer wall exceeds 3 millimeters

　　9、相鄰焊口間距要(yao)求

9. Requirements for the spacing between adjacent weld joints

　　縱焊縫(feng)近點間距應大于等于5倍管子壁(bi)厚;

The distance between adjacent points of longitudinal welds should be greater than or equal to 5 times the wall thickness of the pipe;

　　支管開孔距(ju)主(zhu)管環焊(han)縫或(huo)縱焊(han)縫的近點間距(ju)不小于3倍主(zhu)管壁厚(hou)。

The distance between the opening of the branch pipe and the circumferential or longitudinal weld seam of the main pipe shall not be less than 3 times the wall thickness of the main pipe.

　　10、當耳(er)(er)柱、支架焊接在(zai)管子上時，支架或耳(er)(er)柱焊口(kou)不應穿越管子或管件焊口(kou)。

10. When the ear pillar or bracket is welded to the pipe, the bracket or ear pillar weld should not pass through the pipe or fitting weld.

　　11、焊(han)接組對時的點固焊(han)及固定(ding)卡具焊(han)縫(feng)的焊(han)接，要(yao)求同正式焊(han)接。

11. The requirements for spot welding and welding of fixed fixture welds during welding assembly are the same as those for formal welding.

　　12、拆除固(gu)定卡具時，禁止用(yong)榔頭(tou)直接敲(qiao)掉，應用(yong)砂(sha)輪機或氣焊火(huo)焰(yan)去掉，火(huo)焰(yan)切割于焊縫外(wai)層。與母材接觸部分用(yong)砂(sha)輪機打磨(mo)去除，若(ruo)有缺陷應作滲透檢驗合格后修復。

12. When dismantling fixed fixtures, it is prohibited to directly knock them off with a hammer. They should be removed using a grinder or gas welding flame, and flame cutting is limited to the outer layer of the weld seam. The part in contact with the base material should be removed by grinding with a grinder. If there are defects, they should be repaired after passing the penetration inspection.

　　13、焊(han)縫表面不得有(you)裂紋、焊(han)縫不得有(you)未(wei)熔(rong)合、根部未(wei)焊(han)透等缺陷。

13. There should be no cracks on the surface of the weld seam, and there should be no defects such as incomplete fusion or incomplete penetration at the root of the weld seam.

　　14、焊接(jie)完成后應及(ji)時(shi)焊縫(feng)表(biao)面的渣皮，飛濺，并對(dui)管道焊縫(feng)表(biao)面質量進行(xing)自檢(jian)。

14. After welding is completed, the slag and spatter on the surface of the weld seam should be removed in a timely manner, and the surface quality of the pipeline weld seam should be self inspected.

　　15、不(bu)銹(xiu)鋼風管(guan)、配件(jian)焊接接頭焊后(hou)應進行酸洗(xi)與(yu)鈍化處理(li)，用不(bu)銹(xiu)鋼專用酸洗(xi)鈍化液(ye)(膏)處理(li)不(bu)銹(xiu)鋼接頭表面，焊接時產生的氧化物。

15. After welding, stainless steel ducts and fittings should undergo acid pickling and passivation treatment. The surface of stainless steel joints should be treated with stainless steel specific acid pickling passivation solution (paste) to remove oxides generated during welding.

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