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Bonneted Gates
Precise Flow Control
High Heads (to 500)
Proven Performance
One Source: Design,
Build, Actuate
Long Life, Low
Maintenance
Bonneted Gates
Design Features
Bonneted Slide Gates are normally used forregulating flow
through the outlet works ofdams. They are essentially a
completelyenclosed slide gate that is manufactured and
designed to be embedded (except for theactuator) in concrete.
The Bonneted SlideGate is similar to a large rectangular, orsquare,
gate valve.
Bonneted Slide Gates consist of: a verticallysliding disc or
gate, upstream anddownstream frame sections, a bonnet, abonnet
cover, upstream and downstreamtransition sections, one or more
conduit linersections, and an actuator. Quite often
the gates are used in tandem with the normoperating gate
downstream, and theemergency closure gate upstream.
There are bronze or stainless steel matinseats on the disc and
frame, and a special
type of flush-bottom closure arrangement isalso furnished.The
size of the gate depends upon the
head under which the gate will operate.Normally, the bonneted
gate is not largerthan 10' x 10'. Rodney Hunt Bonneted Gatehave
been successfully used at heads up to500'.
Bonneted Gates can be operated manuallyelectrically, or
hydraulically.
Operation
Hydraulic cylinder
Bonnet cover
Stuffingbox
FLOW
Liner Disc Transition
Stem
Bonnet
Thrust nuts
Vent pipe
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High Pressure BonnetedSlide Gate Specifications
GENERAL
DESCRIPTION
OPERATING and LOADINGCONDITIONS
DESIGN COMPUTATIONS
s specification relates to the design, manufacture andpply of
the high pressure bonneted slide gate system.The system shall
include the gate disc, frame, seats,nsition and liner sections,
bonnet, bonnet cover, rodffing box and scraper, air vent manifold,
gate positionication, transportation to the site, drawings,
installation
ocedures, operating and maintenance manuals, and aller necessary
appurtenances to provide a completeerating system. The system will
be as manufactured bydney Hunt Company or approved equal.
anufacturers shall have a minimum of 1 0 yearsperience in the
design and manufacture of equipmenthis type. Manufacturer shall
submit as a minimum aof 10 projects with bonneted gate
installations. The listall include project name, contact, telephone
number,ars of service, size and method of operation.
e gate shall have a clear waterway opening____inches
by____inches. The gate equip-ent shall be arranged as shown on the
con
ct drawings.
The gate shall be designed for a normal staticad of___feet, plus
a surge resulting fromter hammer equivalent of___feet head.The gate
hoisting system shall have sufficientust capacity to open the gate
against a staticad of___feet and to close the gate againsttatic
head of___feet and when the flowough the full gate opening
is___cfs. Thest sizing computations shall conservativelynsider: the
weight of the disc, rod, and piston;friction of the gate seats and
rod stuffing box;
d the hydrodynamic down-pull forces duringeration. An allowance
of 20% shall be addedhe sum of the above.The conduit liner and
transition pieces shall besigned to resist the forces of handling,
con-te placement, and hydrostatic head equiva-t of___feet of
water.The gate structure and leaf shall be designedwithstand in an
overloading condition thembined forces of a normal water level and
asmic acceleration of ___g (depending onsmic zone of location). The
effects ofreased pressure head shall be considered inseismic
computations.
The gate structure shall be designed to with
nd a flood condition equivalent to___feethead.
sign criteria for each component shall be submitted toEngineer
for approval prior to product computation
d drawing submittal. These criteria shall be establishedd
verified from previously designed and manufacturedtes by that
manufacturer.sign computations shall be performed in sufficienttail
to verify that all of the above criteria are compliedh. The design
computations shall be made part of thebmittal data. Acceptance of
the design criteria andmputations shall not relieve the
manufacturer of theponsibility for the adequacy of the design.
5. GATE COMPONENTSA. Gate DiscThe gate disc shall be constructed
ofstructural steel plate and shall be horizontally andvertically
reinforced to resist the specified loadingconditions. The bottom
edge of the disc shall have abullnose contour of a proven shape.
The surface of thebullnose shall have a stainless steel weld
overlay and
finished to provide a minimum 250 micro-inch finish. Apocket
shall be provided on the downstream side of thedisc to contain the
operating rod thrust nut. The thrust nutshall be attached to the
operating rod in a manner toallow adjustment during installation. A
seal shall beprovided where the operating rod penetrates the top
ofthe disc. Surfaces of the disc in sliding contact with theframe
shall be of corrosion resistant materials. The discfabrication
shall be thermally stress relieved aftercompletion of all welding
and prior to machining.
B. Seat FacingSeat facing materials shall be selected in
accordance withthe design section. Bronze seat facings shall be
cast orextruded, leaded, low zinc bronze. Stainless steel seat
facings shall be ASTM Type 344. The top horizontal seat facings
shall be radiused tofacilitate engagement. The contact surfaces of
the seat facings shall have asurface finish smoother than 63
micro-inch rms. Afterinstallation onto the disc and frame, the
seats shall bemachined to a true plane, to obtain the
tolerancesspecified under the assembly and testing section.
C. Gate Frame and BonnetThe guide slot shall be of a design to
minimizecavitation. All sliding surfaces contacting the disc shall
beof corrosion resistant materials. A bronze bar shall beprovided
at the inert to contact the disc bottom. Frameand bonnet halves
shall be flanged, bolted, pinned and
gasketed in the manufacturer's shop.
D. Transitions and Conduit Lin er SectionsA straight section of
conduit liner shall be providedimmediately upstream of the gate
disc. The straightsection shall have a minimum length of one gate
width.The maximum inward or outward slope allowed intransition
sections shall be 1:10. Transition and liner sections shall be
designed tominimize weld distortions so that the straightness
criteriaof the shop testing section can be obtained. Fluidway
surfaces shall have a roughness smootherthan 250 micro-inch rms.
Gates for operating heads inexcess of 200 feet shall have the
fluidway surface ofstainless steel.
Grout holes shall be provided to fill the voids in thepockets on
the underside of the gate assembly. The groutholes shall be
threaded for pipe plugs. After grouting iscomplete the heads of the
plugs are to be ground flushand painted. The joint between sections
shall be flanged and bolted.The flanges shall be machined to be
flat, perpendicular tothe fluidway, and parallel to their opposite
ends. Flangebolting patterns shall be concentric. The flanges
shallhave the centerlines scribed and the word "TOP"stamped. A
suitable gasket must be provided at eachflanged joint.
E. Bonnet CoverThe bonnet cover shall be attached to the top of
the gate
bonnet with stainless steel studs and
tapped holes in the bonnet flange. Dowel pins shaprovided to
assure alignment. An 0-ring type seal sprovided in a groove in the
top of the bonnet. The stuffing box and gland shall be cast
bronzestuffing box shall have "V" shaped chevron packingpacking
gland shall be adjusted from the top. A rodscraper shall be
provided on the underside of the b
cover.
F. Air Vent PipingIt shall be the responsibility of the gate
manufacturdetermine the necessity of air vent piping and
todetermine the size, location and shape of the air vepiping
system. The air vent piping shall be steel.
The gate manufacturer shall be responsible for theselection of
materials except as otherwise noted.Materials shall be used that
have provided satisfacservice in past installations.
Each gate shall be assembled in the shop completall transitions
and conduit liners, bonnets, bonnet cand stuffing boxes. Flange
bolts shall be snug but torqued. The stuffing box gland shall be
left loose wcompressing the packing. The following checks shmade
and discrepancies rectified:1. The liner, transition and frame
sections shall bechecked for mismatch offsets.2. A 3 ft. straight
edge shall be used to check thewaviness of the fluidway parallel to
the direction ofThe contact of the disc bottom to the frame shall
bchecked by the same criteria.3. The gate shall be stroked through
several operacycles to assure smooth, non-binding operation.4. An
operation test of the hydraulic and electrical
system shall be made to demonstrate proper functof the system
including the functioning and sequenall control and alarm
devices.5. The hydraulic cylinders shall be hydrostatically tin the
cylinder manufacturer's shop at a pressure oof the hydraulic power
unit design pressure.
The gate disc and all exposed steel surfaces shall blasted to
SSPC SP-10.
Hoisting Equipment
Prime:One (1 ) coat of Amerlock
400 at 5.0 mils thick Finish:One ( 1 ) coat of Amercoat 450HS,
color gray _
Immersed Equipment
Prime:One (1 ) coat of Amerlock400 at 5.0 mils thick
Finish:One (1 ) coat of Amerlock400 at 5.0 mils thick
All welding will be done in accordance with AWS D
6. MATERIALS
7. SHOP ASSEMBLY and TESTING
8. PAINTING
9. WELDING
