FIELD: construction engineering.
SUBSTANCE: invention relates to pipeline transport and it can be used at repairs of main lines. Prior to replacing defective section of main line transporting combustible or explosive liquids and gases, section to be repaired is emptied, defective spool is cut out with provision of isolation of combustible and explosive gases and liquids from welding site by placing overlapping members at ends of pins adjoining section under repair, and new spool is welded in place. Prior to welding new spool placed between overlapping members, inert gas is fed into space of new spool and pressure in built exceeding pressure in adjoining sections of pipeline under repair.
EFFECT: improved safety at repairs.
2 dwg
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