WHEN FIELD MACHINING SEAL RINGS, GATE BUSHINGS, OR THE FACING
PLATE IN THE HEADCOVER, THE HEADCOVER, MUST BE DOWELED IN PLACE
AND HELD WITH AT LEAST 50 PERCENT OF THE FLANGE BOLTS TORQUED IN
PLACE.
PLATE IN THE HEADCOVER, THE HEADCOVER, MUST BE DOWELED IN PLACE
AND HELD WITH AT LEAST 50 PERCENT OF THE FLANGE BOLTS TORQUED IN
PLACE.
9.
WICKET GATE REPAIR
The following materials are recommended for rebuilding cast steel wicket gates:
a. Journals - On wicket gate bearing journals turning in greased bronze
bushings rebuild with 309 stainless steel or Nitronic 60 stainless steel weld wire
or rod.
bushings rebuild with 309 stainless steel or Nitronic 60 stainless steel weld wire
or rod.
b. Sealing Surfaces, top and bottom - On the top and bottom sealing surfaces
of the gate, material selection will be partially determined by the facing plate
material.
of the gate, material selection will be partially determined by the facing plate
material.
If the facing plate material is bronze or aluminum bronze use Nitronic 60 or
similar gall resistant stainless steel to provide high wear resistance.
similar gall resistant stainless steel to provide high wear resistance.
If the facing plate material is steel or stainless steel use either Nitronic 60 or
Nickel Aluminum Bronze, UNS C95500.
Nickel Aluminum Bronze, UNS C95500.
c. Sealing Surfaces, heel and toe - Nitronic 60 or an equally gall resistant
stainless steel is recommended for rebuilding leading and trailing edge gate
seal surfaces.
stainless steel is recommended for rebuilding leading and trailing edge gate
seal surfaces.
As an alternative, leading edge surfaces may be austenitic stainless steel, UNS
S30900, and trailing edge seal surfaces may be Nickel Aluminum Bronze, UNS
C95500.
S30900, and trailing edge seal surfaces may be Nickel Aluminum Bronze, UNS
C95500.
The following general procedures are recommended:
a. Machine surfaces to sound metal not less than 0.125 inch deeper than the
finished dimension.
finished dimension.
b. Rebuild surfaces using welding techniques for maximum bond strength.
c. Remachine the surfaces to the manufacturer's original contour and surface
finish.
finish.
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