1、管子下料

1. Pipe cutting

　　⑴、下料應嚴格按設計單線圖進行，切割前材料尺寸應仔細核對。

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、坡口制備要求

2. Requirements for groove preparation

　　管道連接主要是焊接方式，坡口是焊接的首要條件，必須按規范規定進行，中、低壓管道坡口型式采用V型，高壓管道采用YV(雙V)型坡口，坡口加工應平整，不得有裂紋、重皮、毛刺和氧化鐵等。

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

　　管道組對前，將接口內外表面25毫米范圍內的泥垢，油污、鐵銹等干凈，用鋼絲刷或拖布將管內雜物。對預制和安裝時未封閉的管段，應采取措施封堵管口，避免雜物進入管道內。

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、管道預制件應按規定要求編號(管線號、焊口編號和焊工號)以便于質量控制和安裝時查找。

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、預制完畢的管段，應將內部清理干凈，并及時封閉管口，保證管內清潔。特別指出，本工程所有管口在安裝前必須全部封閉，確保預制管道進入現場封堵。

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、等厚管道對接焊口的組對應做到內壁齊平

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

　　8、不等厚管道組成件組對時,當內壁錯邊量超過1.5毫米或外壁錯邊量超過3毫米

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、相鄰焊口間距要求

9. Requirements for the spacing between adjacent weld joints

　　縱焊縫近點間距應大于等于5倍管子壁厚;

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

　　支管開孔距主管環焊縫或縱焊縫的近點間距不小于3倍主管壁厚。

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、當耳柱、支架焊接在管子上時，支架或耳柱焊口不應穿越管子或管件焊口。

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、焊接組對時的點固焊及固定卡具焊縫的焊接，要求同正式焊接。

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

　　12、拆除固定卡具時，禁止用榔頭直接敲掉，應用砂輪機或氣焊火焰去掉，火焰切割于焊縫外層。與母材接觸部分用砂輪機打磨去除，若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、焊縫表面不得有裂紋、焊縫不得有未熔合、根部未焊透等缺陷。

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、焊接完成后應及時焊縫表面的渣皮，飛濺，并對管道焊縫表面質量進行自檢。

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、不銹鋼風管、配件焊接接頭焊后應進行酸洗與鈍化處理，用不銹鋼專用酸洗鈍化液(膏)處理不銹鋼接頭表面，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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