Pl. 6x Fit top and bott --33 WF 33W Field splice SECTION G-G (ELEVATION) Sway frame (See Sec.E-E) ཧ Pl.5x2x1-6 Clip corner & 213 3.3. Fill bar 2x @ 2'-0 max. cre. 12 Field weld- SECTION A-A Min -Field weld SECTION Weld For other applicable notes see Dwg 591-D-248 For size of main material not called for on this Dwg. see All welds and other connections shown are typical for all REVISED CRANE 91,JDER CONNECTION TO OPPER COL. D. HW.R REVISED FIGURE 3. ADDED NOTE TO SEC. G-6 UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION COLORADO RIVER STORAGE PROJECT GREEN DIVISION FLAMING GORGE UNIT-UTAH WYOMING FLAMING GORGE POWER PLANT 22 Ga REV 6-22-60 WELD WE SHOWN FOR COLUMN WEB CONNECTION CHECKED W.SM. DENVER, COLORADO, THIEF STRUD ARCH. BRANCH APRIL 2,1958 591-D-247 Surface under all washers shall be Figure 120. --Powerplant structural-steel superstructure--Columns and framing connections. was based on an outside design temperature of minus 30° F. and an inside design temperature of 45° F. in all spaces except those listed below. Special, higher inside design temperatures were used in a few areas as follows: Office and control room, 72° F.; lobby, toilets, welding room and storage room,65° F. The major heating load is furnished by water to water heat-pumps which supply hot water to heat-exchanger coils installed in heating and ventilating units and air-conditioning units located throughout the powerplant. Additional heat is supplied where needed by electric natural convection, radiant glass, and unit heaters. 91. Ventilation. Ventilation is provided for the comfort and protection of personnel, the distribution and removal of heat, the relief of dampness, and the disposal of contaminated air. Fresh outside air is furnished for the powerplant as a whole at a rate which ranges from approximately two air changes per hour (33, 500 cubic feet per minute) when the outside ambient temperature is above 65° F. to a minimum of one-half air change per hour (6, 250 cubic feet per minute) when the outside ambient temperature is below 60° F. Air is circulated at the rate of 2 changes per hour for the penstock gallery, 5 changes per hour for the generator area and machine shop, 2 air changes per hour for the unwatering and pipe gallery, 6 air changes per hour for the purifer and oil storage rooms, 12 air changes per hour for the battery room, 4 air changes per hour for the electrical laboratory, and 10 air changes per hour for the welding room and toolroom. Exhaust fans are located in the building for removal of contaminated air from the toilets, welding room, battery room, oil purifier room, and oil storage room. Excess ventilating air is exhausted from the building through automatic louvers set to open under a static gage pressure of 0.5 inch of water. 92. Cooling. Cooling of the offices and control room is provided for protection of equipment and comfort of personnel. The cooling loads for the offices and control room were calculated using an outside condition of 95° F. dry bulb and 75° F. wet bulb and an inside condition of 75° F. dry bulb and 63° F. wet bulb. The cooling is furnished by a water-to-water chiller which supplies cold water to heatexchanger coils in the air-conditioning units when the outside ambient temperature is 50° F. or above. When the outside ambient temperature is below 50° F. and cooling is needed in the control room or offices, cool air from the generator room is mixed with the return air from the control room to satisfy the cooling requirements. No refrigerated cooling is provided for any spaces other than the offices and control room in the powerplant. 93. Sewage Treatment Plant. The sewage treatment plant is designed for a maximum flow of 3,000 gallons per day. Sewage from the powerplant, dam, and visitors' center building flows by gravity to collection tanks located in the powerplant from which the sewage is pumped to the sewage treatment plant shown on figure 121. Flow is by gravity through the plant to the tailrace. Sewage is treated by the activated sludge process, extended aeration type. Compartment sizes were designed by the manufacturer. A chlorination well has been provided for future chlorination of the final effluent, if required. The chlorinator would be located inside the powerplant. Design of the treatment plant was based on the following criteria: (1) Design population: Visitors--500 per maximum day; and Operating personnel--10 per shift. (2) Sewage flow: Visitors at 5 gallons each--2, 500 gallons per day; Operating personnel at 15 gallons per operator per shift--450 gallons per day; and Total--2, 950 gallons per maximum day. Power plant wall (467) El. 5620.37 EL 5621.60 EL5617.92 5619.75; *5@10" dowels from wall of aeration tank SECTION 6-6 Filets EL 5611.58 Existing mounting ring. -For supporting brackets see 467 and 473 SECTION 5-5 ·6-10° All dowels 512-6" C. influent -6-10 -6-10°. (E1.5619.25 Exposed edges of concrete shall be chomfered i All other metalwork shown on this drawing including fromes Ploce main reinforcement steel so that bottom of steel is i ELEVATION OF 'a' LINE WALL INDICATING 9-29-60 8-3-00 ELECTRICAL CONDUITS ADDED. CHANGED LOWER BLOCKOUT Ber screen- El 5617.92! €1.5620.87 6 C.I overflow €98 El 36/9.87 5@12° SECTION 3-3 El 5618.00 SECTION 2-2 SCALE OF FEET Figure 121. --Powerplant sewage treatment plant. (3) Chlorination well: Detention time--15 minutes; Residual chlorine--1.0 part per million; and Future equipment if required--a hypochlorinator activated by the sewage This sewage treatment plant was approved by the Utah State Department of Health and the U.S. Department of Health, Education, and Welfare. 94. Lighting System. (a) General. --The lighting distribution system consists of a 480-208Y/120-volt, 3-phase, 4-wire, 60-cycle alternating-current installation. The system consists of seven secondary distribution panelboards from which branch circuits supply energy to lighting fixtures, convenience outlets, and other minor power-consuming devices. The feeder to each secondary distribution panelboard, as well as each branch circuit, is provided with an automatic trip circuit breaker which provides overload and short-circuit protection. The sizes of the panelboard, feeder, and branch circuits were established by using a demand factor of 100 percent. Feeder and branch circuit sizes are designed to carry design load current with a maximum of 3 percent voltage drop from the secondary of lighting transformers KRA and K1B to the loads. Approximately 1 percent drop is allowed in the feeder from the transformers to the secondary distribution panelboards, and approximately 2 percent drop from panelboards to loads. (b) Direct-Current Emergency Lighting.--A 125-volt direct-current lighting system energized from the station battery is provided for emergency illumination of important and critical operational areas in the powerplant in event of failure of the normal alternatingcurrent system. Should failure of the alternating-current system occur, the emergency direct current will be supplied to the contactors from the 125-volt direct-current bus through circuit breaker No. 8 on direct-current control board BCA. The control circuits to the coils of the contactors (these contactors have normally closed contacts) are supplied from circuit breaker No. 1 in lighting board L1A and circuit breaker No. 4 in lighting board LRA. When the alternating current in either of these boards fails, the contactor coil in the associated lighting board deenergizes, thus closing the contacts and energizing the emergency lighting system. Upon restoration of service to the inoperative board, the contactor coil is again energized and the emergency lighting system becomes deenergized. The control system may be tested by tripping either circuit No. 1 in L1A or circuit No. 4 in LRA. The direct-current outlets behind the control board in the control room have been wired direct from the direct-current supply, bypassing the contactors and thus making them available for use at all times for testing purposes. (c) Fixtures. --In most areas of the powerplant, direct-type incandescent lamp fixtures with prismatic glass reflectors are used. Fixtures employing fluorescent lamps are provided in the control room area. (d) Alternating-Current System. --The lighting installation is a 208/120-volt, 3-phase, 4-wire system. Power for the lighting system is supplied through two 480-volt to 208/120volt, 3-phase transformers and voltage regulators connected to the 480-volt station-service switchgear DRA. One transformer is rated at 112.5 kilovolt-amperes and is designated KRA. The other transformer is rated at 75 kilovolt-amperes and is designated K1B. Output of each transformer is distributed at 208/120 volts through individual circuit breaker panelboards to branch circuit panelboards for final distribution to the lighting loads. C. Major Hydraulic Equipment 95. Turbines. (a) Operating Requirements. --On the basis of economic studies the plant nameplate capacity was set at three 36, 000-kilowatt generators. The reaction turbines were sized to match this rating at 365 feet net head, making the nameplate rating available to the power system about 90 percent of the time. Heads as low as 365 feet will be rare. The design (best efficiency) head for the turbine was set at 400 feet, which is near the weighted average operating head and is optimum for spanning the total operating range of 260 to 440 feet. Turbine speed and setting were established jointly, since they are mutually related. Within limits, a deep setting permits higher speeds and vice versa. Some of the variables to be evaluated, judged, or considered, are natural tailwater levels, cavitation factor (sigma), size of unit as affected by speed, building size, excavation required, foundation conditions, and possible retrogression of tailrace channel. At the Flaming Gorge site, the necessity for concrete fill under the plant favored a low setting. With the adopted setting of turbine centerline at elevation 5601.0 and speed at 240 revolutions per minute, if a maximum estimated retrogression of 4 feet should occur, there would be a small tailwater deficiency below normal with one unit running. (b) Design. --The design of the turbine itself was done by the manufacturer, but was controlled by detailed specifications prepared by the Bureau. Principal specified operating requirements or conditions are as follows: Rated output--50,000 horsepower at 365 feet effective head; Range of effective head--260 to 440 feet; Specified minimum tailwater--elevation 5601.6; and Design and construction details are given in invitation No. DS-5263, and are shown on the drawings of the manufacturer. Materials for the parts were specified; unit stresses and fabrication methods for main parts were controlled by reference to the ASME Boiler and Pressure Vessel Code. Principal construction features include plate steel spiral case with bolted radial joints, carbon steel runner, elbow draft tube liner with pier nose, cast steel head cover and discharge ring, self-lubricating guide bearing, stainless steel wearing rings, shaft sleeve, and facing plates, and stainless steel trim on wicket gates. Stress checks on major embedded parts and doubtful looking items were made to secure conformity with the specified stress limitations. Some of the items found to require heavying-up or redesign were stay ring bolts and shrink links, draft tube liner ribs and pier nose, head cover doweling, wicket gate lock, spiral case tie rod lugs, and wicket gate stops. There were two orders for changes issued on the turbine contract, one calling for a centralized grease system to be furnished, and the other deleting shop painting on waterbearing parts. The purpose of deleting the shop painting was to provide for a valid comparison of three types of field-applied coatings, a different type of coating being applied to each of the three turbines. A complete shop assembly of the turbine was not made, as the contractor at a late date proposed subassemblies, and claimed that the complete assembly of dispersed subcontracted components would delay delivery of the turbines, which were urgently needed in the field. He had already built templets which he insisted would eliminate any possibility of misfits. Pressure tests of the spiral case and stay ring at 345 pounds per square inch were successfully made in the subcontractor's shop, using a three-section test ring without head cover and bottom ring in place. Field erection, pressure test, and pressure embedment were specified and successfully completed in accordance with usual practice for these features. Defects requiring field correction and causing delay in installation included leakage along the inside faces of the facing plates, misalinement of head cover-stay ring bolt holes, gate stem grease passage not open, gate stem bushings misalined, stainless steel overlay improperly contoured, and undesired shop prime coat of red lead applied over improperly cleaned castings. These defects were all successfully corrected with costs appropriately backcharged to the manufacturer. |