JETStream 3000 series, Operation Manual, Page: 25 / 84

Bareshaft Pump
17
Monitoring Weep Holes
Weep holes are manufactured into the manifold to alert
the operator when seals have failed. If a seal fails, the
water will leak from its associated leakage hole.
There are two types of weep holes, the high pressure
face seal weep holes that are rectangular slots (Figure
11) and the low pressure uni-valve seal weep holes
that are round. There are three of each type located
along the top of the manifold.
If water is leaking from one of the rectangular weep
holes, the seal that seals the uni-valve to the stuffing
box has failed. On 15K and 20K manifolds, the O-ring
(Figure 13) on the valve makes that seal. On 40K
manifolds, there is no O-ring on the valve to seal the
manifold. The stuffing box contains a face seal to seal
this connection.
If water is leaking from the round weep holes (Figure
11), the outer O-rings (Figure 13) on the valves have
failed.
Note: The larger O-ring will leak to the rect -
angular weep hole.
Monitor the manifold for leakage during operation. If
leakage occurs, immediately replace all of the seals on
the leaking valve.
Inspect the valve seats during seal replacement and
lap the valves if necessary. Refer to “Valve Lapping”
for instructions.
Monitor the manifold for leakage during operation. If
leakage occurs, immediately replace all of the seals
on the leaking valve.
ATTENTION
On 20K manifolds, the rectangular weep holes
also communicates with the top pressure ports.
If water is observed at the rectangular weep
holes, first check the corresponding 20K port
connection. The 20K seal pill may need reposi
-
tioning or replacing.
WARNING
!
If leaks are allowed to continue, expensive dam-
age to the valves or manifold block could occur.
Figure 13: Outer O-rings.
O-rings
Figure 12: Uni-valve to Stuffing Box Seals.
15K, 20K 40K
Leak Path
O-Ring
Face Seal
Uni-valve
weep hole
Face Seal weep hole
Figure 11: Weep Holes