Surge Tank OM and Drawings.pdf

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Collection and Conveyance Facilities inch check valve and a 3-inch plug valve are provided on each of the pump discharge lines and are located in a concrete valve vault.

Water Supply Facilities

A water supply well, approximately 250 ft deep, is located on the Goat Canyon Pump

Station site. The well provides water, considered non-potable, to the Goat Canyon Pump

Station. The water supply facilities consist of a water supply well and pump, a hydropneumatic pressure tank, and associated controls. Hose bibbs are located outside of the generator building, at the sewage wet well, and both inside and outside the surge control/odor reduction area.

The well is constructed using a 10-inch PVC casing. The well screen is constructed so as to meet an allowable sediment concentration in the discharge water of less than 5 mg/L.

The well is capable of sustaining a continuous pumping rate of 75 gpm.

The well water supply pump is a submersible pump manufactured by Grundfos, Model 75S75-12. The pump is rated for 75 gpm capacity at a TDH of 260 ft. The pump is driven by a 7 1/2 hp, 3450 rpm, 3 phase, 60 Hz, 450 volt motor. The pressure tank is a vertical, steel, hydropneumatic bladder tank, as manufactured by Amtrol, Well-X-TROL, Model WX-350. The tank has a diameter of 26 inches, a height of 62 inches, and a capacity of 119 gallons. Tank accessories include a pressure switch, relief valve, and drain valve.

The well water supply operates on pressure control in the hydropneumatic tank.

When the pressure in the tank falls below 60 psig, the water supply pump is called to run.

When the pressure exceeds 80 psig, the pump deactivates.

3.13.3.2 Surge Control System

Pump discharge force main piping associated with the Goat Canyon Pump Station is subject to surge pressure during sudden flow velocity changes that may occur due to an interruption in utility power. To limit surge and associated water hammer, each of the two force mains is provided with a surge arrestor. The 12-inch force main is provided with Surge

Arrestor (SA)-1. The 16-inch force main is provided with SA-2.

The surge arrestor tanks are horizontal, steel, hydropneumatic pressure vessels, manufactured by Young Engineering and Manufacturing, Inc. SA-1 has a diameter of 6 ft-0 inches, a shell length of 8 ft-3 inches, an overall length of 11 ft-3 inches, a usable capacity of

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280 cubic feet, a design flowrate of 2,435 gpm, a maximum design pressure of 100 psi, and a maximum working pressure of 40 psi. SA-2 has a diameter of 7 ft-0 inches, a shell length of

12 ft-4 inches, an overall length of 15 ft-11 inches, a capacity of 550 cubic feet, a design flowrate of 4,000 gpm, a maximum design pressure of 100 psi, and a maximum working pressure of 24 psi. Surge tank accessories include a liquid level gauge, a safety relief valve, an air release valve, and a vacuum relief valve.

Each surge arrestor tank contains a blanket of air over a volume of water. Initial water level inside the tank is set by the relative placement (elevation) of an air relief valve on the side of the tank. Nine threaded connections are provided on the side of the tank, each at a different elevation. The higher the placement of the air relief valve, the higher the water level in the tank.

In the event of a power failure, the surge arrestors absorb and dampen out the resulting pressure surges that occur in the force mains. The surge arrestors are equipped with vacuum release valves to allow air to enter the system when negative air pressures occur within the tanks. Operating parameters are included below:

12" Force Main 16" Force Main

Surge Arrestors SA-1 SA-2

Diameter 6 ft-0" 7-0"

Length 11 ft-3" 15-11"

Maximum Parameters

Head 89 feet 54 feet

Water Level 7 feet 7.5 feet

Air Volume 256 cf 506 cf

Minimum Parameters

Head -22.9 feet -24.1 feet

Water Level 2.89 feet 2.55 feet

Air Volume 30 cf 60 cf

3.13.3.3 Odor Reduction Station

Odorous air from the pump station wetwell is continuously ventilated and treated by the Goat Canyon Pump Station (GCPS) Odor Reduction Station, located in the northeast corner of the Odor Control and Surge Arrestor Building.

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Sump Pumps

Two submersible sump pumps, S-1 and S-2, are provided at the pump station for site drainage. The below grade sump receives drainage from 4-inch PVC floor drains at the odor reduction station, surge arrestor area, the generator building, isolation valve vault, and the sewage lift pump valve vaults. In addition, a constant flow of approximately one half gallon per minute is received from the odor control facility while the facility is in operation. The pumps operate in a lead-lag mode and discharge to the station wetwell. Level control is provided by a series of float switches. The switches are Flygt Model ENM-10.

Each of the sump pumps is a submersible, vortex centrifugal pump and is manufactured by Ebara International Corporation, Model DVFU. Each pump is rated for 119 gpm capacity at a TDH of 9.9 feet. Each pump is driven by a 2 hp, 1740 rpm, 3 phase, 60

Hz, 460 volt submersible motor, as manufactured by Ebara International Corporation. A 3-inch check valve and a 3-inch plug valve are provided on each of the pump discharge lines and are located in a concrete valve vault.

3.13.4.2 Surge Control System

Surge Arrestors

Pump discharge force main piping associated with the Hollister Street Pump Station is subject to surge pressure during sudden flow velocity changes that may occur due to an interruption in utility power. To limit surge and associated water hammer, each of the two force mains is provided with a surge arrestor. The 16-inch force main is provided with Surge

Arrestor (SA)-1. The 30-inch force main is provided with SA-2.

The surge arrestor tanks are horizontal, steel, hydropneumatic pressure vessels, manufactured by Young Engineering and Manufacturing, Inc. SA-1 has a diameter of 6 ft-0 inches, a shell length of 8 ft-3 inches, an overall length of 11 ft-3 inches, a usable capacity of

280 cubic feet, a design flowrate of 3,680 gpm, a maximum design pressure of 125 psi, and a maximum working pressure of 33 psi. SA-2 has a diameter of 8 ft-6 inches, a shell length of

24 ft-4 inches, an overall length of 28 ft-8 inches, a capacity of 1500 cubic feet, a design flowrate of 16,950 gpm, a maximum design pressure of 125 psi, and a maximum working pressure of 30 psi. Surge tank accessories include a liquid level gauge, a safety relief valve, 1991-037-702 3.13-17 an air release valve, a vacuum relief valve, a solenoid valve, ball valves, check valves, exhaust silencer, air volume control panel, level gauge glass, and a pressure gauge.

Each surge arrestor tank contains a blanket of air over a volume of water. Initial water level inside the tank is controlled by level sensors. As initial water level exceeds a set elevation, compressed air is forced into the tank, thereby pushing the water level down and increasing the air blanket. As initial water level falls below a set elevation, compressed air inside the tank is released, thereby allowing the water level to rise and decreasing the air blanket.

In the event of a power failure, the surge arrestors absorb and dampen out the resulting pressure surges that occur in the force mains. The surge arrestors are equipped with vacuum release valves to allow air to enter the system when negative air pressures occur within the tanks.

Operating parameters are included below:

16" Force Main 30" Force Main

Surge Arrestors SA-1 SA-2

Diameter 6 ft-0" 28-8"

Length 11 ft-3" 15-11"

Maximum Parameters

Head 76 feet 69 feet

Water Level 8 feet 10.5 feet

Air Volume 232 cf 1389 cf

Minimum Parameters

Head -18 feet -24 feet

Water Level 4.78 feet 6.15 feet

Air Volume 75 cf 300 cf

Surge Arrestor Air Compressor/Receiver

Surge arrestor compressed air is supplied by a compressor located in the MCC Room of the MCC/Generator Building, with a capacity of 17.1 acfm at 125 psig. The compressor is mounted to a rigid steel frame which straddles an 80 gallon, steel, horizontal receiver tank, with a minimum working pressure of 150 psi.

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The compressor, which is manufactured by Ingersoll-Rand, Model 2475, is a two-cylinder, splash lubricated air compressor driven by a 5 hp, 1760 rpm, 3 phase, 60 Hz, 230/460 volt motor, manufactured by Baldor Electric Company. The compressor provides air to the two surge arrestors through an air receiver tank. Associated appurtenances include check valves, isolation valves, muffler, inlet silencer, discharge tap and pressure relief valve, manual drain valve, end caps, and pressure gauge.

3.13.4.3 Odor Reduction Station

Odorous air from the pump station wetwell is continuously ventilated and treated by the Hollister Street Pump Station (HSPS) Odor Reduction Station, located in the northeast corner of the Odor Control and Surge Arrestor Building.

Air is drawn from the wetwell via two (2) 12-inch PVC ducts. The ducts are manifolded and tie into a 12-inch intake to the scrubber unit.

The HSPS Odor Reduction Station consists of a blower, a three-stage counter-current scrubber, pH and ORP controllers, metering pumps, chemical storage tanks, recirculation pumps, a control system, and a make-up water system.

The HSPS Odor Reduction Station Process Schematic is presented in Figure 3.13-4.

Odor Reduction Scrubber

The odor scrubber removes hydrogen sulfide and other odorous compounds from the air stream via mass transfer to an aqueous solution. Mass transfer is accomplished via counter-current contact of the air stream with aqueous solution on random packing material in the scrubbing towers. The scrubber consists of three modular stages, each configured to eliminate short circuiting of the air stream and to maximize contact with a chemical solution of water, sodium hypochlorite (NaOCl), and sodium hydroxide (NaOH).

The three-stage counter current odor scrubber is a Triplex Air Scrubber System, manufactured by U.S. Filter/Davis Process. The scrubber vessels are manufactured from high density, cross linked polyethylene (HDXLPE). The towers are about 7 feet high. The towers contain a bed of media which consists of 2-inch polyethylene packing, manufactured by Jaeger Products, Inc. Above the packing in each stage is a manifold with two 2-inch teflon fog nozzles, manufactured by Bete Fog Nozzles, Inc., which distribute scrubber

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Indicator lights are provided at LCP-HSPSS to annunciate pump status. When a pump is running, its corresponding “Running” light is illuminated. LCP-HSPSS is also provided with an elapsed time meter for each pump. The sump pumps are equipped with high temperature switches installed in the motor windings to prevent operation on winding high temperature. In the event of high temperature detection, the corresponding “High

Temperature Alarm” light illuminates at LCP-HSPSS. The sump pumps are also equipped with moisture sensing elements for motor winding moisture detection. In the event of winding moisture detection; the corresponding “Moisture Detection Alarm” light illuminates at LCP-HSPSS. In the event of either condition, a sump pump failure alarm “AREA SUMP

PUMP FAILURE” is activated at the LCP-HSPS.

Surge Arrestors

The surge arrestor tanks provide surge control for the pump station 16-inch and 30-inch force mains. Tank water levels are set by adjusting the level probe switches. Prior to pump start-up, the tanks are approximately half full of water. As the pumps run, the air in the tanks is compressed. As the pumps shut down, the water in the tanks is released under pressure to prevent column separation.

Each surge arrestor is provided with an LCP. The LCPs are provided with status indicator lights, pushbutton switches for “Test”, “Silence”, and “Acknowledge”, and an

On/Off toggle switch. When liquid in the tank is within the normal operating range, as sensed by the level switches, the “In Range” light is illuminated. In the event of high liquid level, a “High Level” indicator light is illuminated at the LCP, and a “SURGE ARRESTOR

HIGH LEVEL” alarm is activated at LCP-HSPS. In the event of low liquid level, a “Low

Level” indicator light is illuminated at the LCP, and a “SURGE ARRESTOR LOW LEVEL” alarm is activated at LCP-HSPS.

Liquid level in the surge tank is controlled by the LCP by introducing or expelling compressed air. If liquid level is too high, a compressed air solenoid valve is opened, allowing compressed air in and forcing the liquid level down. If the liquid level is too low, a solenoid valve on the top of the tank is opened, causing air to be released from the tank and allowing the water level to rise.

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Surge Arrestor Air Compressor

A surge arrestor air compressor supplies make up air for surge arrestors SA-1 and

SA-2. The air compressor is provided with a field control panel. The FCP is provided with

“High Pressure”, “Low Pressure”, and “Low Low Pressure” indicator lights, a Reset pushbutton. a Hand/Off/Auto Selector Switch, and an hour meter. In the event of an air compressor failure, an “AIR COMPRESSOR FAILURE” alarm is activated at LCP-HSPS.

This condition is included in the common “HOLLISTER STREET PUMP STATION

SYSTEM FAILURE” alarm at PCC.

Odor Reduction Station

The HSPS wetwell off-gas is treated by a packaged odor reduction system which draws air from the wetwell through 12-inch PVC ducts. The odor reduction system consists of a three-stage, factory-packaged unit with counter-current flow, inducted draft blower, and sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) solution chemical feed systems. Operation of the odor reduction system is intermittent, as dictated by the Air

Pollution Control Permit. Starting and stopping the facility is manual. Once started, chemical feed control is automatic.

Circuit breakers, blower On/Off switches, recirculation pumps On/Off switches, chemical pumps Hand/Off/Auto (HOA) selector switches, panel fan On/Off switch, status indicator lights, pH/ORP controllers, an alarm bypass Override/Normal selector switch, a water seal On/Off switch, and a Phase Reset pushbutton switch are located at LCP-HSORS.

In the event of an odor reduction system failure, LCP-HSORS initiates an “ODOR

REDUCTION SYSTEM FAILURE” alarm at LCP-HSPS, provided the Alarm Bypass

Switch is in the “Normal” position. This condition is included in the common “HOLLISTER

STREET PUMP STATION SYSTEM FAILURE” alarm at PCC.

An emergency shower/eyewash is provided outside the Odor Reduction Station. The shower is provided with an in-line flow switch. A portable emergency eyewash station is provided inside the Odor Reduction Station. The portable eyewash station is provided with a local mushroom pushbutton panic switch. Activation of either alarm switch annunciates a

“SAFETY SHOWER” alarm at LCP-HSPS and a “HOLLISTER STREET PUMP STATION

SAFETY SHOWER” alarm at PCC.

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9. Well Water Supply Tank

Number: 1

Manufacturer: Amtrol, Inc.

1400 Division Road

West Warwick, RI 02893

(401) 884-6300

Model: WELL-X-TROL, WX-350

Type: Pre-pressurized, Hydro-pneumatic

Material: Steel

Diameter: 26-inches

Height: 61 7/8-inches

Capacity: 119 gallons

Pressure Range: 60 to 80 psig

Supplier: Fain Pump Company, Inc.

12029 Old Castle Road

Valley Center, CA 92082

(619) 749-4211

Local Representative: Fain Pump Company, Inc.

12029 Old Castle Road

Valley Center, CA 92082

(619) 749-4211

6.13.3.2 Surge Control System

1. Surge Arrester SA-1

Application: Surge control for 12" force main

Manufacturer: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Diameter: 6'-0"

Shell Length: 8'-3"

Overall Length: 11'-3"

Capacity: 280 cubic ft

Max. Flow: 2435 gpm

Design Head: 106.25 ft

Max. Allowed Pressure: 40 psig

Max. Working Pressure: 100 psi @ 200°F

Type: Horizontal, hydropneumatic surge tank

Materials: Carbon Steel

Inlet/Outlet Connection: 6-inches

Level Control: Manual

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Supplier: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Local Representative: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

2. Surge Arrester SA-2

Application: Surge control for 16" force main

Manufacturer: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Diameter: 7'-0"

Shell Length: 12'-4"

Overall Length: 15'-11"

Capacity: 550 cubic ft

Max. Flow: 4,000 gpm

Design Head: 68 ft

Max. Allowed Pressure: 24 psig

Max. Working Pressure: 100 psi @ 200°F

Type: Horizontal, hydropneumatic surge tank

Materials: Carbon Steel

Inlet/Outlet Connection: 8-inches

Level Control: Manual

Supplier: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Local Representative: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

6.13.3.3 Odor Reduction Station

1. Odor Reduction Blower

Manufacturer: The New York Blower Company

171 Factory Street

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Application: Surge control for 16" force main

Number: 1

Manufacturer: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Diameter: 6'-0"

Shell Length: 8'-3"

Overall Length: 11'-3"

Capacity: 280 cubic ft

Max. Flow: 3680 gpm

Design Head: 96.22 ft

Max. Allowed Pressure: 33 psig

Max. Working Pressure: 125 psi @ 200°F

Type: Horizontal, hydropneumatic surge tank

Materials: Carbon Steel

Inlet/Outlet Connection: 8-inches

Level Control: Automatic (1 phase/60 Hertz/110 volt)

Supplier: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Local Representative: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

2. Surge Arrester SA-2

Application: Surge control for 30" force main

Manufacturer: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Diameter: 8'-6"

Shell Length: 24'-4"

Overall Length: 28'-8"

Capacity: 1500 cubic ft

Max. Flow: 16,950 gpm

Design Head: 89.13 ft

Max. Allowed Pressure: 30 psig

Max. Working Pressure: 125 psi @ 200°F

Type: Horizontal, hydropneumatic surge tank

Materials: Carbon Steel

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Inlet/Outlet Connection: 18-inches

Level Control: Automatic (1 phase/60 Hertz/110 volt)

Supplier: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Local Representative: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

3. Surge Arrester Air Compressor

Manufacturer: Ingersoll-Rand

800 Beaty St. #C

Davidson, NC 28036-9000

(704) 896-4100

Model: Type T30 Model 2475, Simplex

Rating: 17.1 acfm @ 125 psig

Type: Single stage, two-cylinder, splash lubricated

Supplier: U.S. Equipment, Inc.

1810 West Venice Blvd.

Los Angeles, CA 90006

(213) 733-4733

Local Representative: U.S. Equipment, Inc.

1810 West Venice Blvd.

Los Angeles, CA 90006

(213) 733-4733

4. Surge Arrester Air Compressor Motor

Manufacturer: Baldor Electric

5711 Rs. Boreham Jr. St.

Fort Smith AR 72901-8394

(501) 646-4711

Horsepower: 5

RPM: 1760

Service: 3 phase, 60 hertz, 460 volt

Enclosure: TEFC

Temperature Rise: 35 o C @ F.L.

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Insulation: Class F

Service Factor: 1.15

NEMA Design: B

Supplier: U.S. Equipment, Inc.

1810 West Venice Blvd.

Local Representative: U.S. Equipment, Inc.

1810 West Venice Blvd.

5. Surge Arrester Air Compressor Receiver Tank

Manufacturer: Ingersoll-Rand

800 Beaty St., Suite C

Davidson, NC 28036-9000

(704) 896-4100

Capacity: 80 gallons

Type: Horizontal, steel construction

Min Working Pressure: 150 psi

Supplier: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

Monrovia, CA 91016

(626) 359-6262

Local Representative: Young Engineering Manufacturing, Inc.

132 W. Chestnut Ave.

6.13.4.3 Odor Reduction Station

1. Odor Reduction Blower

Manufacturer: The New York Blower Company

171 Factory Street

La Porte, IN 46350-2699

Model: RFE-315

Type: FRP, Radial Fume Exhauster (RFE)

Size: 315 RFE

Surge Tank Dwgs