How should buried joints of pre-fabricated insulated pipes be handled?
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I seek advice from experts: for the underground parts of HVAC systems, prefabricated insulated pipes are used, but how should these pipes be connected after the joints have been welded? Polyurethane filling can only be used; so how can the outer high-density polyethylene shell be connected? Is there a simple and reasonable method? Urgent, urgent! Please advise, experts
The professional term for joint treatment is patching; there are specialized patching sleeves, and in most cases, foaming is used inside the sleeve on-site
You can go to a insulation materials store and purchase pre-made polyurethane pipes along with adhesive, based on the diameter of the buried pipes. After welding, simply cut the pre-made pipes to the length required at the weld site and bond them together; this is simpler and cleaner than foaming on-site. All that needs to be paid attention to is the handling of the overlaps and ensuring they are secure.