Commissioning, Startup, Operation, and Shutdown
XHD Installation, Operation, and Maintenance Manual
60
c) Four packing rings (106)
1. Flush connection
2. Packing rings
3. Lantern ring
Figure 43: Full flush setting (1L4)
4. Install the gland halves and evenly hand-tighten the nuts .
NOTICE:
Do not overtighten gland nuts. Overtightened packing causes excessive friction between
packing and sleeve and will result in damaged components.
Table 9: Flush water requirements
The flush water requirements are listed for both the weep style and full flush packing arrangements.
Group
Size
(L5) Full Flush
GPM (liters/
min)
Full Flush (1L4)
GPM (litres/
min)
(2L3) Weep
Flush GPM
(liters/min)
Mechanical
Seal Flush
PF1
XHD50,75
10 (38)
6 (26)
0.2 (0.8)
Consult Seal
Mfg
PF2
XHD80
15 (57)
10 (38)
0.3 (1.1)
PF3
XHD125
23 (87)
18 (68)
0.6 (2.3)
PF4, PF4S
XHD150,200
37 (140)
32 (121)
1.1 (4.2)
PF5
XHD250,300
61 (231)
56 (212)
2.2 (8.3)
Pump priming
WARNING:
These pumps are not self priming and must be fully primed at all times during operation.
Loss of prime can lead to excessive heat and severe damage to the pump and seal.
Pumps that are not self-priming must be fully primed at all times during operation.
Prime the pump with the suction supply above the pump
1. Slowly open the suction isolation valve.
2. Open the air vents on the suction and discharge piping until the pumped fluid flows out.
3. Close the air vents.
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