The plumber cuts the pipes and supporting pipe fittings according to the drawing requirements, and then the welder positions and welds them. The work done by the plumber is called pipeline assembly. The plumber cuts and connects the pipeline components according to the design and specification requirements and the actual conditions on site.
Different pipeline connection methods are different
For example, sockets are glued Connection, hot-melt connection, flange connection, clamp connection, welding, threaded connection, threaded connection, etc.
What are the quality objectives and control of the pipeline group?
1. Quality Objective?
1.1. The difference between the ellipses and perimeters of the two tubes. ?
1.2. There should be no debris inside the pipe, especially the inner wall 50mm away from the pipe mouth must be cleaned. 1.3. There is no visual debris inside the steel pipe. 1.4. The nozzle group should comply with the provisions of Table 1:?
2. Construction methods and operating technical requirements:?
2.1. The debris in the anti-corrosion pipe should be removed before the nozzle group is aligned. . There should be no dirt within 50mm of the pipe end. The plumber shall inspect and accept the quality of the pipe mouth bevel
. Except for joints and elbows (pipes), internal mouthpieces should be used for pipe groups. When matching, the number of pipelayers should not be less than 2. The slings used to lift pipes should meet the strength requirements and not damage the anti-corrosion layer. The lifting point should be placed at the bisector of the drawn pipe length. ?
2.2. In longitudinal slope sections, stabilization measures should be taken for pipes and construction equipment according to geological conditions. The construction methods
should be determined according to the topography, topography and geological conditions. In rocky areas in mountainous areas, it is advisable to assemble them under the ditch. Before assembling, the bent pipes should be prepared according to the measured angle, and installed by matching the seats. ?
2.3. If there are wrong edges in the nozzle assembly, they should be evenly distributed on the entire circumference. It is strictly prohibited to use hammering method to force the alignment. Root pass
After welding, it is prohibited to correct the misalignment of the pipe interface. When using the internal mouthpiece, the moving mouthpiece should be disassembled after the root welding is completed, and the pipe should be kept balanced when moving. When using an external mouthpiece, it should be loaded and unloaded according to the requirements of the "Welding Procedure Regulations"
2.4. When using an internal mouthpiece, remove the mouthpiece after the root welding is completed. When using a pneumatic internal mouthpiece, the air compressor supply pressure
and flow rate must meet the requirements of the mouthpiece; when using an external mouthpiece, it can be disassembled after more than 2/3 of the root welding is completed. The root weld is divided into multiple sections and evenly distributed. The lifting equipment can be evacuated after the root weld is completed.