冷拔无缝钢管及螺旋缝钢管管道安装冷拔无缝钢管运至现场后，首先根据设备及管件位置进行排管，并在现场将每根冷拔无缝钢管的具体长度丈量好，标注具体尺寸和排列位置，以便于接口时对号入座，采用吊车下管，下管过程中采用尼龙吊带进行吊装，以管道保温层的保护。 1修口、对口修口集中在管道出厂前加工完成，为保证焊接质量，焊接前均进行全面检查、修正，使管子端面、坡口角度、钝边、圆度等，均符合对口接头尺寸的要求，个别冷拔无缝钢管需在现场做坡口处理时，采用气焊切割，清除熔渣后再用砂轮打磨平整。

After cold-drawn seamless steel pipe and spiral seamless steel pipe are installed and transported to the site, the cold-drawn seamless steel pipe is first arranged according to the position of the equipment and pipe fittings, and the specific length of each cold-drawn seamless steel pipe is measured at the site, and the specific size and arrangement position are marked so as to facilitate the seating of the joint, the crane is used to lower the pipe, and the nylon sling is used to hoist the pipe in the process of lowering the pipe for pipeline preservation. Temperature protection. 1. Repairing and counterpart repairing are mainly finished before pipeline leaving factory. In order to ensure the quality of welding, comprehensive inspection and correction are carried out before welding, so that the end face, groove angle, blunt edge and roundness of the pipe meet the requirements of the size of counterpart joints. Individual cold-drawn seamless steel pipes need to be grooved on the spot by gas welding cutting, after slag removal, grinding and leveling with grinding wheels.

对口操作程序为：检查接口接头尺寸→清膛→确定并调整钢管纵向焊缝错开位置→第一次管道找直→调整对口间隙尺寸→对口找平→管道拉线找直→点焊2焊接接口焊接采用电弧焊，一遍打底，二遍成活，每道焊缝均一次焊完，每层施焊的引熄弧点须错开。

The procedure of counterpart operation is as follows: checking the size of the joint clearing the bore determining and adjusting the staggered position of the longitudinal weld of the steel pipe first pipe straightening adjusting the gap size counterpart straightening pipe drawing line straightening spot welding welding the joint is welded by arc welding once and twice, each weld is welded once, and the arc extinguishing point of each layer is staggered.

2.01管节焊接前应先修口、清渣、管端端面的坡口角度、钝边、间隙，应符合规范规定；不得在对口间隙夹焊帮条或用加热法缩小间隙施焊。

2.01 Pipe joint shall be repaired, slag cleared, groove angle, blunt edge and clearance of end face of pipe before welding, and shall conform to the specifications; no welding strip shall be clamped in the counterpart clearance or the clearance shall be reduced by heating.

2.02对口时应使内壁齐平，采用长300mm的直尺在接口内壁周围顺序贴靠，错口的允许偏查差应为0.2倍壁厚，且不得大于2mm.

When 2.02 is in alignment, the inner wall should be flat, and the length of 300 mm should be close to the inner wall sequentially. The allowable deviation of the error should be 0.2 times the thickness of the wall and should not be greater than 2 mm.

2.03对口纵、环向焊缝的位置应符合下列规定：

2.03 The position of the longitudinal and circumferential welds of the counterpart shall conform to the following requirements:

a、纵向焊缝应在管道中心垂线上半圆的45°左右处；

A. Longitudinal welds should be at about 45 degrees of the semi-circle on the vertical line of the pipeline center.

b、有加固的冷拔钢管，加固环的对焊焊缝应与管节纵向焊缝错开，其间距不应小于100mm；加固环距管节的环向焊缝不应小于50mm；

B. For steel pipes with reinforcement, the butt weld of the reinforcement ring should be staggered with the longitudinal weld of the pipe joint, and the distance between the butt weld and the longitudinal weld should not be less than 100 mm, and the circumferential weld of the reinforcement ring should not be less than 50 mm.

c、管道任何位置不得有十字形焊缝。

C. No cross weld shall be allowed in any position of the pipeline.

2.04定位焊时，定位焊缝所有焊条号（或牌号）应与正式焊接相同，但焊条直径可选细一些。定位焊缝的焊接电流要选得比正式焊接时大一些，通常大10%－15%，以保证焊透。

In 2.04 positioning welding, all electrode numbers (or grades) of the positioning weld should be the same as those of the formal welding, but the diameter of the electrode should be smaller. The welding current of the positioning weld should be larger than that of the formal welding, usually 10%-15% larger to ensure penetration.

2.05管道的焊接：焊缝质量必须符合GB50268-97中

2.05 Pipeline Welding: Weld quality must meet GB50268-97

4.2的有关规定，焊缝应平滑，宽窄一致，根部焊透，无明显的凹凸缺陷及咬边现象，焊缝加强面应高出管面约2毫米，焊出坡口边缘2-3毫米。

4.2 Relevant regulations, the weld should be smooth, narrow and uniform, the root of the weld penetration, no obvious concave and convex defects and undercut phenomenon, the weld reinforcement surface should be about 2 mm higher than the pipe surface, the weld groove edge 2-3 mm.

2.07管道与法兰焊接时，管道应插入法兰三分之二，法兰与管道应垂直，两者的轴线重合。

When 2.07 pipeline and flange are welded, two-thirds of the flange shall be inserted into the pipeline, and the flange and the pipeline shall be vertical, and the axes of the flange and the pipeline shall coincide.

a、水平管道坡度不小于0.3%.

A. The gradient of horizontal pipeline is not less than 0.3%.

b、焊接前应检查施焊环境，焊接安装设备、焊接材料的干燥及清理，必须符合规范及焊接操作规定。

B. The welding environment should be inspected before welding. The drying and cleaning of welding installation equipment and welding materials must conform to the specifications and welding operation regulations.

c、焊接双面焊件时，应清理并检查焊缝根部背面，清理缺陷后，方可施焊背面焊缝。规定清根的焊缝应在清根后进行外观检查后方可施焊。

C. When welding double-sided welds, the back of the root of the weld should be cleaned and inspected. After clearing the defects, the back of the weld can be applied. It is stipulated that the root-clearing weld should be welded after the root-clearing and the appearance inspection.

d、管壁大于4mm的管道焊接前必须打坡口，坡口表面不得有夹层、裂缝、加工损伤、毛刺及焰切割熔渣等缺陷。焊接后药皮应敲干净，焊口应呈现均匀的鱼鳞状，不得有气孔、夹渣、裂纹、焊瘤等现象，咬肉长度应在规范要求内。

D. Pipeline whose wall is more than 4mm must be grooved before welding. No defects such as interlayer, crack, processing damage, burr and slag cutting by flame should be found on the groove surface. After welding, the coating should be knocked clean, the weld joint should be uniform fish scale, there should be no gas hole, slag inclusion, cracks, welding nodules and other phenomena, and the length of biting meat should be within the specification requirements.

2.08大于20mm的放气阀门采用法兰连接，小于或等于20mm的放气阀门采用螺纹连接。

Flanged connection is used for bleeding valves larger than 20 mm and threaded connection is used for bleeding valves smaller than or equal to 20 mm.

2.09管道转弯、穿墙及支吊架处，不应有接口和焊缝，管道穿越墙壁应预埋套管，套管直径应比管道保温外径大50mm.管道最高点设放气阀，最低点设放水阀。

2.09 There should be no joints and welds at pipeline turning, wall crossing and support and hanger. Pipeline crossing the wall should be pre-embedded with sleeves, whose diameter should be 50 mm larger than the external diameter of pipeline insulation. Ventilation valves should be set at the highest point of pipeline, and drainage valves should be set at the lowest point.