Flowserve PSS III Seal Durametallic - Manual (Page 6)

Notes for Figure 3:
• Recommendations are for use in water or other similar viscosity liquids.
• These recommendations apply to products having a maximum tempera-
ture of 71°C (160°F).
• Use Plan 13 on vertical equipment to vent the seal area even when
operating in zone B
Cooling Recommendations for PSS III Figure 3
If the seal runs hot, check for proper seal setting, see Step 7, and check the flush
line for obstructions.
If you encounter special problems during installation contact your nearest
Flowserve Sales and Service Representative.
Operational Recommendations
Do not start up the equipment dry . Vent air from the stuffing box before startup.
Circulate clean product, Plan 11, or a clean fluid from an external source, Plan 32,
through the seal chamber whenever the equipment is in operation unless operating
in Zone B of Figure 3 where no flush is required.
6
3600
2700
1800
900
RPM
By-pass flush Plan 11,
or External Flush
Plan 32 Required
for Proper Seal Cooling
Not Recommended,
Exceeds PSS III
Speed Limitations
Seal Size
Zone A
Zone C
(1.500 to
2.000")
38.1 to
50.8 mm
(2.125 to
3.000")
54.0 to
76.2 mm
(3.125 to
4.000")
79.4 to
101.6 mm
(4.125 to
5.000")
104.8 to
127.0 mm
(5.125 to
6.000")
130.2 to
152.4 mm
3000
Flush Recommended to Keep Stuffing Box Clean
No Flush Required for Cooling of Seal, Vent Required
Can be Run Dead-Ended Plan 02
Zone B