Flowserve Tandem Seal - Manual (Page 6)

6
Recommended Piping for Tandem Designs Figure 3
API Plan 52
1. Solenoid valve in drain is normally open allowing primary seal weep age to
vent through orifice.
2. If primary seal leakage becomes excessive, the pressure switch in the
secondary seal thermal convection loop will activate alarm and close
solenoid valve in the drain line.
3. Bypass line around solenoid valve is normally closed but is used to bleed
system pressure.
Pressure Alarm
and Switch
Fill Connection
Supply Tank Assembly
API Plan 11
Bypass Line From
Pump Discharge
Orifice
.031" (.8mm)
Solenoid Valve
(normally open)
1 foot
(300 mm)
minimum
Bypass Valve
(normally closed)
To Recovery
Orifice
Option
Primary
Seal
Secondary
Seal