(c) Design Stresses. --The maximum stresses used for design were based, in general, on the following criteria:

(1) Tensile. --The allowable design stresses in tension used for the following materials were the lower value of the percentages of the yield and ultimate strength of the material:

(2) Compression. -- The allowable design stress in compression used for the materials listed above were the same as for tension.

(3) Shear. -- The allowable design stresses in shear were not more than 0.6 of the allowable design stresses in tension.

(4) Structural steel. -- The allowable design stresses for structural steel in tension or compression were not more than 20,000 pounds per square inch. In general,

GENERAL OPERATING INFORMATION

A. PURPOSE AND OPERATION:

1. Two 16.75 x 34 foot fixed wheel gates are provided to regulate spillway
releases for controlling the water surface elevation of the reservoir.

2. Each gate will be opened, stopped or closed with unbalanced pressures
on the gate by operating valves and push buttons at the control cabinet.
Each gate is supported in the open or intermediate positions through a
cable and sheave system by oil confined above the piston.
3. Each gate shall be operated separately. Normally both motor-pumps
shall be used for opening a gate. However, one motor-pump is capable
of opening a gate in twice the normal opening time. The gates close by
gravity without the motor-pumps, and a non-adjustable flow control
valve is used to obtain a relatively constant closing rate. The control
system is designed to operate with a maximum oil pressure of 1000
psi but will normally operate at a pressure of 875 psi or less.

4. A power interruption when the gate is open, stopped, closed or closing
has no effect on the gate, but an interruption and subsequent
restoration of power when the gate is opening will cause the gate to
stop and necessitate restarting the pumps.

5. Gate position in feet is indicated for each gate in the control cabinet.

NOTE: For the electrical schematic and wiring diagrams, see inside of Electrical compartment door.

JIC HYDRAULIC SCHEMATIC

B. OPERATING INSTRUCTIONS: 1. General

a The hanger yoke must be in a vertical position for gate operation. The hanger stud is engaged for servicing only.

b. Prior to normal operation of the gates, the hydraulic valves should be set as follows:

(1). Valves J,. J. K,, K2. H. L ond M-- fully open.

(2) Valves A, A2, B1, B2, U,, U2. V. V2. W. X,. X2.Y,.Y2, Z. D. R,, R2 and N--fully closed.

(3).4-Way valve--in neutral position.

c. Oil level in tank should be at "LOW level for both gates open and "HIGH level for both gates closed.

d. The oil pressure switch, relief valves and unloading valves should

have been previously adjusted as specified under the Installation and Servicing Instructions, Paragraph D.

Place 4-way valve in NEUTRAL).

4. To stop gate No.1 or No. 2:

a. Shift 4-way valve to NEUTRAL.

b. Close valves A, and B, or A2 and B2.

c. If gate is opening, press STOP push button.

5. To reverse travel of gates:

a. Shift 4-way valve to NEUTRAL.

b. Press STOP push button if gate is opening or press RUN push button if gate is closing.

c. Shift 4-way valve to OPEN or CLOSE as required.

Figure 67. -16.75 by 34-foot fixed-wheel gate hoists control --Operating diagrams and instructions. (Sheet 1 of 2.) From drawing No. 591-D-1353.

INSTALLATION AND SERVICING INSTRUCTIONS

A. GATE AND HOIST INSTALLATION:

1. The gates should be assembled on the erection beams as shown on Dwg. 591-0-887, Invitation No. DS-5632 and the hoists and controls installed as shown on Dwgs. 591-D-1043 and 1260, Invitation No. DS-5662 and (D) 90088-A, respectively. Each hoist cylinder assembly should be installed with the piston, piston stem and sheave block supported by the hanger stud.

2. Service the hoists and control cabinet in accordance with Paragraph
B. Filling the System with Oil

3. Lower the sheave block, 1044-37,of each hoist (by opening appropriate
valves A, and 8, or A, and 8. shifting 4-way valve to OPEN position
and starting the pumps) until its top surface is 20-6" from the bottom
surface of the stem gland, 1044-15 Reeve the four hoist ropes,
1044-31, os shown on Dwgs. 591-0-1043 and 1044. Tighten the
adjusting eyebolts, 1044-2, to refusal or until the sheave block
starts to move up.

4. Operate the hoists, as outlined in Paragraph B of General Operating
Information, to raise the gates clear of the erection beams, 525-16,
and remove the beams. If one of the gates will not clear the erection
beams (indicating the structural stretch of the ropes has exceeded the
2clearance provided for beam removal), reseat the gate and tighten
the eyebolts to remove the structural stretch while maintaining the
20-6 dimension. Repeat as necessary.

5. Lower each gate until it seats on the spillway crest and adjust
eyebolts to obtain a dimension of 4 between the sheave block
and stem gland

6 Operate each gate through several complete opening and closing cycles. Readjust eyebolts to maintain the 4 dimension of Step 5.

B. FILLING THE SYSTEM WITH OIL:

1. It is assumed each hoist is installed as instructed in the preceding
Paragraph A-1.

2. Approximately 800 gallons of new, clean, light hydraulic oil is
required to fill the complete system. The oil shall have a viscosity of
about 150 SSU at 100°F. and be similar to Texaco Regal, Type A (R&O)
or conform to Military Specifications MIL-L-17672A, Grade 2110TH.
Special care should be taken to assure cleanliness and to vent all air
from the system during filling.

3. Perform the following preliminary steps:

a. Visually check the dial settings of pressure switch PS for agreement with values listed in the following Subparagraph D-3.

b. Open all hand-operated valves in the system (A,. Az. B. B2. H, J, J. K. K2. L. M. U,, U2. V1. V2. W. X1, X2. Y. Y2 and Z), except valves D. N, R, and R, which should be closed.

c. Adjust relief valve E to open at minimum pressure.

d. Fill the oil tank to the LOW level on the sight gage and maintain

this level during the filling operation.

4. To fill the hoist cylinder and hydraulic lines:

a. Crack the two air vent plugs Q in the pump suction line until air
vents then retighten plugs.

b. Shift 4-way valve to OPEN and press RUN push button to start pumps
to begin filling upper cylinder heads through lines a, and a2. After
a few minutes, close valves Z. X, and X2. When cylinder heads are
full, indicated by a pressure increase as relief valve E opens at
approximately 100 psi, close valves U, and U2. Loosen tubing connection
on pilot line g at unloading valve G, vent air and retighten.

c. Shift 4-way valve to NEUTRAL position. Close valve M and open valves

Z and N. After a few minutes, close valves w then N, open valve

M and then close valves Z. Y, and Y2 in succession.

d. Shift 4-way valve to CLOSE position and continue to fill lower parts
of cylinders through lines b, and b2. When cylinders are full as
indicated by a pressure increase, close valves V, and V2 Open then
reclose vent valves W. X,. X2.Y,, Y and Z then press STOP push button.
e. Fill oil tank to HIGH level.

5. Check and adjust relief valves E and F, unloading valve G,. and
pressure switch PS to operate at the values listed in Paragraph D.
Pressure Devices".

6. Operate each hoist separately through several cycles to remove air
and to check operation, as follows:

a. Open appropriate valves A, and B, or A, and B. Press RUN push
button and shift 4-way valve to CLOSE position to raise piston and
relieve load on hanger. Pressure switch PS will stop pumps when
piston contacts upper cylinder head. Unscrew hanger stud.
b. Shift 4-way valve to OPEN position and restart pumps to lower
piston. Check clearances as sheave block lowers. PS will stop
pumps when piston contacts lower cylinder head.

c. Shift 4-way valve to CLOSE position and restart pumps to raise
piston. After PS stops pumps at the top of the piston stroke, momen-
tarily open appropriate valves U, and V, or U, and V2 to vent any
accumulations of air in the cylinder, then reclose. Close valves
A, and B, or A, and B2.

C. POSITION INDICATOR INSTALLATION AND ADJUSTMENT: Install indicator parts and reeve cobles as shown on Dwgs 591-D-1260 and 1265

2 With the gates seated and the pistons against the upper cylinder heads, adjust the indicator cables until the pointers are inch below the CLOSED position, Bottom of counterweights, 1265-7c, should be approximately inch from stop, 1262-238.

D. PRESSURE DEVICES--FUNCTIONS, SETTINGS, AND ADJUSTMENTS:

1. Relief valve E limits maximum system pressure whereas relief valve
F functions to by-pass oil to tank when the gates are closing or the
piston is raised by hydraulic pressure.

a. Relief valve E should be adjusted as follows:

(1)Set pressure switch PS to open contacts at 1,100 psi using the calibrated adjusting screw on the switch.

(2)With valves 8, and B, closed, shift 4-way valve to CLOSE
position and press RUN push button.

(3) Adjust relief valve E to obtain a gage pressure of 1000 psi.
(4) Press STOP push button and reset pressure switch PS to open
contacts at 900 psi. (See following Subparagraph D-3).

b. Relief valve F should be adjusted as follows:

(1) Open valve N and close valve M.

(2) With valves B, and B, closed, shift 4-way valve to NEUTRAL position and press RUN push button.

(3) Adjust relief valve F to obtain a gage pressure of 100 psi.
(4) Press STOP push button. Open valve M and close valve N.

2. The unloading valve G operates when opening the gates to return
the oil from under the pistons directly to the tank, bypassing the
flow control valve and relief valve F. The valve should be
adjusted as follows:

a. With valves B, and B, closed, shift 4-way to NEUTRAL and press
RUN push button

b. Adjust relief valve F to obtain a goge pressure of approximately 600psi.
c. Adjust unloading valve G to obtain a gage pressure of 520 psi.
d. Readjust relief valve F as described in preceding subparagraph.
3. The oil pressure switch PS shuts off the pump-motors when one of
the gates is fully open. The switch should be adjusted as follows:

a With valves B, and B2 closed, close valve M and shift 4-way valve
to CLOSE position Press RUN push button

b. Using valve M as a throttle, adjust pressure switch contacts to open at
900 psi on rising pressure and close on falling pressure at 750 psi.
c Open valve M

4 The flow control valve automatically throttles the oil to maintain a
constant rate of gate closure regardless of the oil pressure developed
by a varying gate load The valve has been factory calibrated to pass
a fixed flow of 9.5 gpm

E. MAINTENANCE:

1. The service and maintenance procedures recommended by the manufacturer shall be followed for all commercial components.

2. The oil tank and cylinders shall be drained of accumulated sediment annually through drain valves D, R. and R2

3. The oil filter should be removed and cleaned immediately after the gates

are installed, and thereafter at 1-year intervals, as follows:

a. Close valve L, remove and clean filter.

b. Replace O-ring and reassemble filter.

c. Loosen the two vent plugs Q on either side of filter and crock valve L
to allow filter housing to fill with oil and air to vent. When all air is
vented, tighten vent plugs Q and reopen valve L.

4. Inspect and lubricate the position indicator mechanisms annually.

5. All wire ropes and sockets should be inspected annually for deteriorating
effects, such as corrosion, kinking, cracking of individual wires, or
loosening in the sockets, which may make replacement necessary.

6. All wire ropes should be wire brushed and lubricated annually, or more
often if found necessary. Apply Lubriplate 630AA, which has been
thinned with a volatile solvent to a consistency that will penetrate the
ropes, by brush, to the ropes.

7. The sheave bearings should be lubricated annually with Lubriplate 630AA
through button-head fittings. When wire ropes are replaced, sheave
bearings should be removed, cleaned, and repacked.

8. During the first year following installation, operate each gate through
a complete opening and closing cycle at least once a month and, if
necessary, readjust the cable eyebolts, 1044-32, to obtain a dimension
of 4 between the top of the sheave block, 1044-37, and the bottom
of the stem gland, 1044-15, with the gate seated. After the first year,
operate the gates and adjust the eyebolts annually, as required.

9. Every 3 years remove and check the oil pressure gage for accuracy and
read just oil pressure devices if necessary.

10 After approximately 5 years of service, one gate should be raised,

supported on the erection beams and the following maintenance performed:
a. Check wheels for free rotation. Lubricate bearings with a
lubricant similar to Texaco All-Temp or that which conforms to
MIL-G-10924A

b. Check seals for damage and flexibility of movement and repair or
replace as necessary.

c. Check guide shoe springs and rubbing plates for freedom of movement and damage. Repair as necessary.

d. Repair damaged areas of paint on gate and equalizer connections

e. Based on the repairs required and the condition of the gate at this
inspection, the inspection of the other gate should be scheduled and
the interval for future maintenance should be determined and
scheduled for both gates.

11. The piston packing may be replaced as follows:

a. Lower gate requiring new piston packing to fully closed position
and leave 4-way valve in CLOSE position with appropriate valves

A, and B, or A2 and B2 open. Press RUN push button. After pumps
stop place 4-way valve in NEUTRAL and close valves A, B,, J.
and K, or A2, B2. J2 and K2. Open valve U, or U2

b. Disconnect piping and remove upper cylinder head. Provide means
to catch overflow of oil when head is removed. CAUTION: Extreme
care must be taken to prevent introduction of contaminants into
cylinder or hydraulic oil.

c. Remove packing gland and old packing.

d. Install new packing and replace packing gland. Install new o-ring
for cylinder head flange and replace head. Reconnect piping.

e. Open appropriate valves A,, B,, J, K, and U, or A2, B2. J2. K2 and U2
With 4-way valve in NEUTRAL, press RUN push button. Repeatedly
shift 4-way valve to OPEN then back to NEUTRAL to fill upper
cylinder head and vent air.

f. When all air has vented, close valve U, or U2 and place gate at
desired opening.

g. Replace oil in tank, if required.

Figure 67.-16.75- by 34-foot fixed-wheel gate hoists control --Operating diagrams and instructions. (Sheet 2 of 2.) From drawing No. 591-D-1353.

structural steel stresses were based on the American Institute of Steel Construction "Specification for the Design, Fabrication and Erection of Structural Steel for Buildings," 1961.

(5) Hoist cylinders. --The allowable design stresses for the hoist cylinders were based on the recommendations of the ASME Boiler and Pressure Vessel Code -- Unfired Pressure Vessels Section, 1962.

57. General. The criteria for determining the size of the outlet works was for the conveyance system to be of sufficient capacity to be capable of returning to the river in a 12-month period, the entire annual flow of the maximum year of record (approximately 2.6 million acre-feet in 1950) excepting 40,000 acre-feet of absolute dead storage below the centerline of the outlet pipes. The invert of the river outlets was established at elevation 5740.0 which was the minimum pool required to accommodate about 200 years of sediment inflow.

The outlets were originally required to also meet the following criteria:

Required capacity, second-feet

3,000
4,050

Reservoir elevation, feet

5790

5935

To avoid excessive velocities in the outlet pipes, a criterion was established limiting the maximum discharge of each outlet to 2,000 second-feet, except in an emergency, regardless of the reservoir head.

58. Selection of Location. Details of the outlet works are shown on figures 68 and 69. The river outlets consist of two 72-inch-diameter pipes which extend through the dam to a gate structure, located at the toe of the dam, to the left of the powerplant building. The pipes reduce in size at the lower end of the elbow to 66 inches in diameter and extend to the 66-inch ring-follower emergency closure gates, located in the gate structure at the toe of dam. The pipes then extend downstream, beneath the powerplant service area, for approximately 200 feet, at which point 66-inch hollow-jet valves regulate the discharge into the river downstream of the powerplant tailrace. The downstream portions of the pipes have been encased in reinforced concrete. Overbreak in excavation, as well as poor and shattered rock, necessitated the construction of a support structure to provide a base for the concrete-encased outlet pipes. A semicircular trashrack structure protects the intakes of the two outlet pipes at the upstream face of the dam. A bulkhead gate, operated by a gantry crane at the top of the dam, will provide closure at the upstream face of the dam of either pipe for maintenance or inspection. Provisions are provided to gain access to the pipes through manholes from an adit in the dam.

59. Reinforcement. The following assumptions or procedures were used in designing the reinforcement around the outlet pipes:

(1) For pipe embedded in the mass concrete of the dam, no bursting pressure was assumed, except for the bellmouth at the intake and for a portion of the pipe at the downstream face of the dam.

(2) Temperature differential acting in combination with live load dam stresses was assumed as follows:

Varies linearly from 0° F. at upstream face to 5° F. at P.I. of top bend; 5° F. differential between P.I. of top bend and P. C. of bottom bend;

Varies linearly from 5° F. at P. C. of bottom bend to 10° F. at downstream face of dam; and

Temperature differential of 5° F. for entire length of pipe when combined with dead load dam stresses.