方案十

　　What

　　Seal flush from external clean source .

　　Why

　　Seal chamber heat removal

　　Process and solids removal from seal chamber .

　　Increase seal chamber pressure and fluid vapor margin .

　　Where

　　Dirty or contaminated fluids ,paper pulp .

　　High temperature service .

　　Polymerizing and /oxidizing fluids

　　Preventative Maintenance

　　Use throat bushing sized to hold pressure or maintain flow

　　velocity .

　　To restrict dirty process fluid ,regulate injection flow rate

　　To increase fluid vapor margin ,regulate injection pressure .

　　Injection fluid must be compatible with process fluid .

　　Regularly monitor control system for closed valves or signs of

　　plugging