方案十八

　　What

　　Typically used to apply an anti-freezing fluid to the atmospheric side

　　of seals in services or atmospheric conditions below ( 32F).

　　Why

　　Ice formation on the atmospheric side of seals can cause seal

　　damage during startup .The anti-freezing fluid displaces water that

　　may have collected about the seal .

　　Where

　　Used primarily with singles seals in vertical pumps

　　May be used in cold climate offshore applications

　　May be used in chilled or cryogenic services

　　Reservoir is normally only open to the seal during equipment

　　commissioning and startups

　　Preventative Maintenance

　　Check level prior to startup .The isolation valve should be opened

　　prior to startup in order to flush out any collected water on the

　　atmospheric side of the seal .Flow from the reservoir should be

　　visually confirmed at the seal drive collar ,at the seal drain ,or by

　　monitoring the level gauge .Close isolation valve after the startup

　　sequence is completed to preserve anti-freezing fluid for future use .

　　If water or ice is observed collecting at the seal ,a flush from the

　　Plan 51 reservoir can be performed .