| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for effectively preventing freezing of steam piping.SOLUTION: A system (10) includes at least one first antifreezing valve (12) disposed on a prescribed place of a steam piping main pipe, and trap portions (14) respectively disposed at a downstream side of the first antifreezing valve. The trap portions respectively have a steam trap (16) connected to the steam piping main pipe in series, and a second antifreezing valve (18) connected to be communicated with a strainer of the steam trap. The first antifreezing valve and the second antifreezing valve are constituted to be opened when the inside of the steam piping main pipe has a prescribed pressure or less, or a prescribed temperature or less. |
