The invention relates to the technical field of maintenance and heat repair operation of high-temperature steam
heat supply network pipelines, and discloses a steam
heat supply network multi-section maintenance and heat repair
system and method based on heat preservation and pressure preservation, and the
system comprises a main steam heat source, a main pipeline, a main pipeline stop valve, a
branch pipeline, a
branch pipeline stop valve, a maintenance area, a non-maintenance area, a temporary steam heat source and the like. According to the method, the heating
pipe reheating starting construction period is greatly shortened through the
modes of sectional multi-section maintenance, section-by-section heating
pipe reheating and heat preservation and pressure preservation of non-maintenance section areas. A temporary steam heat source is used for heat preservation and pressure maintaining in a non-maintenance area,
steam condensation is avoided, meanwhile, waste of steam of a warm
pipe is avoided, heat loss of a steam
heat supply network is reduced, and the
system energy efficiency is improved. The method is easy to operate, economical, convenient to use, wide in applicability and capable of being suitable for various steam stopping and pipe heating reheating working conditions such as high-temperature steam heat
supply network maintenance.