| Nitrogen displacement welding technology for standard operating procedures, strict control of high safety level index, wide application, often containing condensate pipeline in natural gas fire operation, but the technology is still insufficient:condensate gas pipeline replacement caused by volatilization not clean again, prolong replacement, replacement of the hot work cycle cost increase. To avoid this phenomenon, especially for the natural gas ignition technology freeze plugging water condensate oil pipe line, R&D "bearing range≤2.2MPa, pressure time≥5h, heated easily broken and dissolved, the residue can be separated, does not affect the normal operation of the pipeline" separation device within the frozen plugging agent, sealing device and sealing technology technology, and the technology of nitrogen displacement welding gas field the effective combination of application, eventually reaching the effectively shorten the replacement cycle, reduce the displacement welding hot work operation cost, ensure safety, and "natural gas condensate pipeline freezing and blocking technology in the application of nitrogen displacement welding" has passed the safety qualification Department of safety evaluation. |
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