API Pump mechanical seal thermosiphon buffer vessel is used for atmospheric pressure double mechanical sealing buffer liquid washing system PLAN52 .When the buffer liquid's temperature is raising ,Adjusting the the flow of cooling water to control the temperature between 8DegC to 16DegC. The level switch and pressure meter is monitoring the sealing operation . This program is not allowed to transport media leak to the atmosphere. The reservoir is connected to the ventilation system ,the buffer pressure is close to the atmospheric pressure. Sealing Auxiliary System is used for series sealing, providing buffer for sealing, taking away heat, reducing sealing surface temperature, improving sealing lubrication condition, creating an ideal working environment for sealing, thus greatly improving mechanical seal reliability . Provide monitoring window or detection alarm device interface, keep the media does not directly leak to the atmosphere, protect the environment.