• 1. open-system freezing: 开敞系统冻结

• 1.Freezing Weather Precaution - Subsequent to testing a piping system, valves should be in an open position to allow complete drainage.
  结冰气候预防-检测管线系统后，阀门应该处于开启状态，做到排泄完全充分。
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• 2.FREEZING WEATHER PRECAUTION: Subsequent to testing a piping system, valves should be left in an open position to allow complete drainage.
  冰冻气候预防措施：测试管道系统后，法门应该处于开启位置，使得能够实现完全排泄。
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