卷管接长技术要求

1.5 Tack welding of longitudinal seam fit-up 纵缝装配定位焊

1.6 Fit-up inspection 装配检验

1.7 Tab welding 引弧焊

1.8 Longitudinal

root welding 纵向封底焊 1.9 Internal

welding of longitudinal seam 纵缝内侧焊接

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Root gap and high-low of longitudinal seam shall be adjusted with suitable clamping apparatus and then fastened by tack welding, the total length of which shall be long enough to achieve the fastening strength required. Each section of tack weld shall be no less than 50mm, and in line with the requirements of welding procedure.

纵缝的焊跟间隙和错皮要使用合适的夹具工具进行调整并用定位焊固定，定位焊焊缝总长要足以保证强度要求，每段定位焊长度应不小于50mm，并要满足焊接程序的要求。

Fit-up inspection shall be performed with inside arc template panel and rulers according to API 2B and related welding procedure.

根据API 2B和相关的焊接程序，利用内弧检测样板和直尺进行装配检验。

Run-on and run-off tabs shall be welded at the both ends of longitudinal weld seam of pipes rolled from plates. The tabs, which are 100mm long, shall be consistent with the pipe in groove, thickness and curvature.

在卷制管的纵缝两端要使用引弧和熄弧板，弧板长100mm，坡口、板厚和曲度与钢管一致。

See welding procedure for details. 详见焊接程序。

See welding procedure for details. 详见焊接程序。

1.10 External gouging of longitudinal seam 纵缝外侧打磨

1.11 External welding of longitudinal seam 纵缝外侧焊接

1.12 Tabs removal 弧板移除

1.13 Pipe reforming

管材修整

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Before external welding, root gouging on external side, including all the tack welds and root welds, shall be performed. Finally the groove shall be ground to remove carbon layer and other defects.

焊前必须清根，包括定位焊和封底焊，彻底清除掉碳化层和其它有害物质。

See welding procedure for details. 详见焊接程序。

Tabs shall be removed with flame cutting and ground smooth.

用火焰切割去除弧板并打磨光滑。

If the welded pipe, after self-inspection, needs to be corrected, reforming shall be performed to the prescribed radius. If the pipe is found acceptable by self-inspection, it can be submitted to inspection department for further inspection. Before reforming however, overlaps of weld (if any) shall be ground off so that the weld may transits to the base metal smoothly to the visual requirements.

如果焊接管在自检之后需要矫正，则需要对卷管进行整改以达到规定的半径。如果卷管自检合格，则需报质检部门进一步检查。在整改前，重叠的焊肉（如果有）要打磨掉，以使焊接光滑过度到母材，满足外观要求。

Note: During reforming, the upper roll shall not press too much in case the weld and base metals are damaged mechanically.

说明：整改过程中，上滚轮不要过度加压以免焊缝和母材受到机械损伤。

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1.14 Visual,

dimensional and tolerance inspection 外观、尺寸和误差

1.Visual inspection of welds as

“Specification for structural Weld and Inspection”. 外观检验依据《结构焊接检验规格书》。

2. For tubule butt welded into lengths, the butt high-low shall 检验

not exceed t/10 or 6mm whichever is less, however, mismatch in excess of 3mm is not permitted unless the joint is welded from both sides. Longitudinal welds of two adjacent pipe sections shall be staggered by at least 90? except otherwise noted.

环缝错皮不能超过t/10或6mm中的较小值，另外，除非是双面焊，否则错皮不能超过3mm。在没有特别说明的情况下，相临两段纵缝至少错开90度。

3. Length tolerance长度误差

The Length tolerance shall meet requirements of API 2B & “specification for structural fabrication of offshore platforms and structures”.

长度误差要满足API 2B和《海洋平台及结构物结构建造规格书》的要求。 4.

Out roundness椭圆度：

For pipes of external diameter up to and including 2000 mm, the out roundness, which is defined as the difference of maximum and minimum outer diameters of pipes at any point along the pipe length, shall not exceed 0.75 percent of the nominal internal diameter or 6.4 mm (1/4 in) which is lesser. For pipes of external diameter greater than 2000 mm, shall not exceed 15 mm.

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对于外管径小于等于2000毫米的钢管，椭圆度不能超过0.75％倍的内径或6.4毫米（1/4英寸）中的较小值。椭圆度是沿管长方向任意一点最大与最小外径的差值。外径超过2000毫米的钢管，椭圆度不超过15毫米。 5.

Circumference 周长

The tolerance of outer circumference of pipes at any point along the length of pipe shall be within ?0.25% of the nominal circumference when external diameter greater than 650 mm, or ?5mm when external diameter up to and including 650 mm. 当管径大于650毫米时，沿管长方向任意一点的外周长误差不能超过0.25％倍的外径理论周长；当管径小于等于650毫米时，误差不能超过?5 毫米。

6. Straightness 直线度

The maximum allowable straightness deviation in any 3m

increment of length shall be 3 mm. The maximum allowable straightness deviation in any length of 12m shall not exceed 10 mm, in any length greater than 12m shall be no more than 12 mm.

在任意3米长管段上，直线度偏差不能超过3毫米；在任意12米长管段上，直线度偏差不能超过10毫米；在12米长度以上的管段上，直线度偏差不能超过12毫米。

7.

Pipe ends管端

Bevels of pipe ends shall be in line with specific requirements. Root face shall be perpendicular to the longitudinal axis of the pipe. The deviation shall be within 1.6mm(1/16 in) in each 305mm(1ft) of diameter with the maximum of 6.4mm (1/4 in), measured with right angle square across the pipe end. 管的端部坡口要达到特定的要求，坡口的钝边要垂直于管的纵轴。沿管径每305毫米（1英尺）垂直度偏差不超过1.6 毫米(1/16英寸)，最大不超过6.4mm（1/4in），用直角尺在管端测量。

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1.15 NDT 无损检验 1.16 Defect repair

NDT inspection shall be according to “Specification for Structural weld and Inspection” 无损检验依照《结构焊接检验规格书》。

Each defect found in base metal shall been further detected of base metal 母材缺陷修复

to determine its area. For pipes that have be completed, the defects whose depth does not exceed 5 percent of nominal wall thickness and mechanical damage the depth of which does not exceed 5 percent of nominal wall thickness or 1.6mm(1/16 in) may be neglected. The defects exceeding the above limits shall be removed to the sound metal. After removal, the concave shall be smooth. The removal thickness shall not exceed 7 percent of nominal wall thickness, with the maximum of 3.2mm(1/8 in). For rolled steel plates, repair welding is permitted if the defect depth exceeds the above limits but within 20 percent of the nominal wall thickness. Repair welding shall not be allowed for defects with depth exceeding 20 percent of nominal wall thickness or defect length/width exceeding 20 percent of nominal diameter. For pipes made of plates other than rolled, repair welding is prohibited without specific approval.

母材上发现的每个缺陷都要进行进一步的检测以确定区域。对于已卷制管材，如果缺陷深度不超过5% 倍壁厚，机械损伤不超过5% 倍壁厚或1.6毫米(1/16英寸)，则缺陷可以忽略。超过上述限制的缺陷要消除，消除缺陷之后，凹面应平滑，去除厚度不能超过 7% 倍壁厚，最大不超过3.2 毫米(1/8英寸)。用于卷管的板材，如果缺陷超过上述限制，但在20% 倍壁厚以内，可以进行焊接修复。如果缺陷深度超过20% 倍壁厚或缺陷长度/宽度超过管径的20%，则不允许修复焊接。对于板材制成的管而非卷制管，未经特别批准，不得进行修复焊接。