The selection of loose flanges depends on on-site installation conditions, maintenance requirements and pipeline working conditions. A one-sentence judgment is as follows:
Prioritize loose flange connections when there are on-site pipeline deviations, needs for frequent disassembly/cleaning/maintenance, butt joint of different materials, large-caliber/medium-high pressure, no hot work conditions, or later transformation requirements; for small-caliber, low-pressure, precisely centered pipelines without disassembly needs, more economical connection methods can be selected.
