Selection of submerged arc welded straight seam steel pipe

(1) Pipes with high requirements for peak regulation Because the user’s gas consumption is very uneven, the pipeline pressure fluctuates frequently, the steel pipe is subjected to large alternating stress, and the pipe has been lacking in expansion under alternating stress, if selected The spiral welded steel pipe with many welds and high probability of defects will not guarantee the safe operation of the pipeline.

(2) The pipeline passes through the earthquake fault zone or passes through the local high-intensity seismic zone. Due to the frequent geological activities of these sections, longitudinal or axial alternating stress will be generated on the pipeline. There are many spiral welds and the probability of defects is higher than that of straight seam submerged arc welded steel tubes, not to mention seamless steel pipes. Under long-term stress, the probability of accidents in spiral welded steel pipes is much higher than that of submerged arc welded straight seam steel pipes. Therefore, it should be used in this area. Submerged arc welded straight seam steel pipe.

(3) For pipelines with high requirements for internal and external anti-corrosion coatings, submerged arc welded straight seam steel pipes shall be used. Spiral submerged arc welded steel pipe has many weld beads. The weld bead height is generally higher than that of submerged arc welded straight seam steel pipe. When the steel pipe is inside and outside the anticorrosion, the combination of anticorrosive material and bare pipe is not as tight as that of submerged arc welded straight seam steel pipe. The anti-corrosion effect is also good without submerged arc welded straight seam steel pipe.

(4) For important crossing projects, submerged arc welded straight seam steel pipes should be used. Since the maintenance management in the future is more difficult than the general line segment, it is especially necessary to use a submerged arc welded straight seam steel pipe with excellent performance.

(5) For pipeline weak links, such as hot elbow pipe, submerged arc welded straight seam steel pipe shall be used. Due to the change of direction, the hot and cold elbows are subjected to larger internal and external forces than the straight sections of the general line. Because of the various factors in the tanning process, the stress is not easily eliminated, which is a relatively weak link in the long-distance pipeline. Submerged arc welded straight seam steel pipes with comprehensive performance can make up for these shortcomings.

For more info, you may refer to: https://www.permanentsteel.com/product/carbon-steel-pipe.html

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