组对焊口错边处理措施及不锈钢管切割内飞溅处理及其预防措施

For the two misaligned weld joints with an exceeding height of welding joints (No. 50 and 58，whose misalignment are within the scope stipulated in ASME B31.3) on the instrument air pipeline IA-710808, grinding will be done to these two parts of welding joints.

2. 对于不锈钢管切割时产生的内飞溅，我方将对产生的内飞溅进行打磨处理，并采取以下防内飞溅的预防措施：

For the spatters inside stainless steel pipe produced by cutting, grinding will be done and the following measures will be taken for prevention:

 对于公称直径DN≤50mm的不锈钢管采用带不锈钢专用砂轮片的切割机进

行切割，这样即可防止切割时内飞溅的产生。

Cutting of the stainless steel pipe of DN≤50mm shall be done by using the cutter equipped with disk special for stainless steel to prevent internal spatters producing.

 对于公称DN>50mm的不锈钢管用等离子切割机进行切割，并采取如下图的

方式防止切割时内飞溅的污染：

Cutting of the stainless steel pipe of DN>50mm shall be done by using plasma cutter, and pollution of internal spatters will be prevented as shown in the following sketch:

首先，在不锈钢管下料尺寸确定后，划出切割线，然后根据下料尺寸，余料尺寸以及切割坡口方向确定挡板的推入方向。挡板采用2块厚度δ=2mm，直径D1=D-3mm（D为管内径）的不锈钢板和1条Φ22的镀锌管焊制而成。但为方便切割后挡板能顺利从管内拖出来，挡板应迎着坡口方向推入，并使第1块隔板置于切割坡口前方且距切割线10mm处。管子切割后再用带不锈钢专用砂轮片的砂轮机（对于DN≥150mm的不锈钢管）或不锈钢内磨机（对于DN=100mm和DN=80mm的不锈钢管）对切口附近内飞溅进行局部打磨

焊口错边处理措施及不锈钢管切割内飞溅处理及其预防措施 编号Ref.No: Treatment & Prevention Methods for Assembly of Misaligned NH-HDPE+PP-WPR-290 Welding Joint and Spatters Inside SS Pipe Plant: PP+HDPE Contractor: TISA REV：A Client: CSPC Subcontractor: CP6CC Page 2 of 2 处理。

First of all, line out the cutting line after fixing the dimension of stainless steel pipe to be cut, and then fix the pushing direction of baffles according to the dimensions of pipe cut and remained and the bevel direction. The baffles are welded by using two stainless steel plates with a thickness of δ=2mm and a diameter of D1=D-3mm (D is the inner diameter of pipe) and oneΦ22 galvanized pipe. In order that the baffles can be pulled out of pipe after cutting, it should be pushed in the direction of beveling, and locate the first one in front of the beveling and 10mm distant from cutting line. After cutting, partial grinding will be done to internal spatters around cut by using grinder equipped with disk special for stainless steel (for stainless steel pipe of DN≥150mm) or inner grinder (for stainless steel pipe of DN=100mm and DN=80mm).

切割线cutting line切割坡口方向10mm待切割的不锈钢管＞50 2mm

3. 安全注意事项 Safety Notes

 配带好有关劳保用品，特别是防护眼镜.

Safety equipment shall be well worn, especially the safety glasses.  遵守有关机具设备的操作规程，注意用电安全.

Relevant operation instructions of tools and equipment shall be complied with and attention be paid to use of electricity safely.

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