Is it feasible to construct 340 meters of prefabricated directly-buried steam pipelines with steel casing using jacking method?
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As the title indicates, it involves a 0.8MPa steam pipeline with a straight underground length of 320 meters (which needs to pass through a municipal road). Pipe jacking construction is planned, using prefabricated buried pipes with a steel sleeve structure; the inner pipe is a 20#273*7 seamless tube, while the outer pipe is a 480*7 spiral tube. 350 meters have been ordered. May I ask if it’s possible to bury such a long steam pipeline directly in the ground? Is it compliant? How to address thermal stress? How to handle the condensate?
A bellows compensator should be used, a drain well must be installed, and the design must be carried out by a qualified design institute.
How far apart should bellows compensators be installed? Where then should the hydrophobic wells be installed?
Compensators are needed approximately every 50 meters. This is a pressure pipeline, and there are many other detailed technical issues; it is necessary to engage a qualified entity for design, and the construction drawings must also be submitted to the Special Inspection Institute.
Jacketed pipe installation for heating pipelines is not the same as direct burial of steam pipelines; for specific requirements, refer to the heating design specifications
The jacking construction of heating pipelines is not the same as the direct burial installation of steam pipelines; it is necessary to refer to the heating design specifications for details.
I agree with your view; it still needs to be based on standards
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