Section 13205 DOUBLE WALL HORIZONTAL ABOVEGROUND FUEL STORAGE TANKS

Section 13205

DOUBLE WALL HORIZONTAL ABOVEGROUND FUEL STORAGE TANKS

PART 1 - GENERAL

1.1 THE REQUIREMENT

The CONTRACTOR shall furnish and install a double wall horizontal aboveground fuel storage steel tank complete with accessories as specified herein and indicated on Drawings. This Specification covers insulated aboveground horizontal fuel storage tank which shall be supplied with fill system and accessories necessary for the completed unit to meet all applicable safety and code requirements. The unit shall be pre-assembled by the manufacturer such that it is ready for operation once power and control wiring are connected at the end user site. The accessories may be installed on site if deemed necessary by the manufacturer. CONTRACTOR to arrange and pay for all permits, inspections and tests as required by federal and local codes.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following Sections and divisions apply to the Work of this section. Other Sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Division 01, Additional General Requirements

2. Section 03300, Cast-in-Place Concrete

3. Section 05505, Metal Fabrications

4. Section 09800, Protective Coating

5. Section 15000, Piping, General

6. Section 15100, Valves, General

7. Section 16442, Control Panels

8. DIVISION 16, Electrical

9. DIVISION 17, Instrumentation and Control

1.3 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS

A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.

B. Comply with the latest editions of the following codes, regulations and standards.

1. NFPA 30: Flammable and Combustible Liquids

2. NFPA 31: Standard for Installation of Oil Burning Equipment

3. STI: Steel Tank Institute

4. UL: Underwriter's Laboratory.

5. ASTM C-332: Standard Specification for Lightweight Aggregates for Insulating

Concrete.

6. California Air resources Board (C.A.R.B).

1.4 WARRANTY

A. The fuel storage tank and all components specified in this section shall be warranted by the manufacturer for a minimum five (5) year period after beneficial occupancy of the Work pursuant to “Use Prior to Final Completion” of the General Conditions, against defects in workmanship and materials. Prorated warranties are not acceptable.

1.5 SUBMITTALS

A. Shop Drawings: CONTRACTOR shall submit copies of shop drawings for complete tank package including equipment datasheets, catalog cuts and electrical wiring diagrams. The catalog cuts shall include all components including all mechanical,electrical and control components. Provide layout of all piping indicating location of fittings and accessories with specific dimensions and erection drawings. Shop drawings shall include tank supports and seismic restrains based on seismic requirement for Zone 4 with calculations signed and stamped by a profissional Engineer registered in the State of California.

B. Shop Drawing Approval: CONTRACTOR shall submit shop drawings for approval and wait to receive drawing acceptance prior to product fabrication.

C. Certification: Tank shall bear the U.L. 142 label for aboveground liquid storage.

PART 2 - PRODUCTS

2.1 GENERAL

A. Materials:

1. Only new material shall be used in the manufacturing process and the manufacturer shall ensure that the material used meets all appropriate specifications and quality assurance requirements.

B. Dimensional Requirements:

1. Nominal storage capacity of the tank shall be 2,000 gallons.

2. Nominal height of the tank shall not exceed 60 inches.

3. Nominal width of the tank shall not exceed 78 inches.

4. Nominal Shell length shall shall not exceed 144 inches.

C. Loading Conditions: Tank shall meet the following design criteria.

1. Internal Load: Tank(s) shall withstand an air pressure test of 5 pounds per inch.

2. Tank shall be designed to support accessories when installed according to manufacturer's instructions and limitations.

3. Tank shall be provided with suitably designed and located lifting lugs which have a 2:1 safety factor.

D. Tank Unit Description:

1. Tank unit shall be an insulated aboveground tank (with secondary containment) used for storing flammable liquids. All accessories shall be C. A. R. B. approved components.

2. Tank unit shall be composed of a horizontal steel primary storage tank with a secondary leak containment shell of a minimum 1/4 inch thick steel plate.

3. The primary and secondary containment steel shells shall be constructed according to UL Standard 142 requirements of horizontal tank.

4. Tank shall be delivered as a complete UL-listed assembly with two factory supplied, welded-on saddles. Size and location of saddles shall be as required by tank manufacturer to comply with seismic and wide design criteria for the Project. Saddles to be set level on a solid concrete foundation in the containment pad indicated on the Drawings. The saddles shall provide a 6-inch (Nominal) space between the foundation pad and the underside of the tank

5. Provisions shall be made to enable heavy equipment to lift and move the entire unit.

6. Exterior Protective Coating:

a. Surface Preparation: Grit blast - SSPC-SP-6 Commercial Blast. b. Finish coating system minimum 7 DFT on the shell and heads.

c. Prime coat (DFT = 4 mils) Tnemec Pota-Pok Plus Series L 140, Or Equal from Carboline Coatings Company.

d. Finish coat (DFT = 3 mils) Tnemec Endura-Shield Series L 1081, Or Equal from Carboline Coatings Company.

7. Tank shall be manufactured and labeled in strict accordance with Steel Tank Institute (STI) Fireguard® Thermally Insulated, Double Wall Steel Aboveground Storage Tank standards as applied by a licensee of the STI. Tank shall be subject to the STI’s Quality Assurance program and shall be backed by the STI 30 year limited warranty.

E. Emergency Vent:

1. Primary and secondary tanks shall be furnished with a 6-inch diameter emergency vent fittings.

2. Primary tank shall be furnished with a 6-inch diameter UL listed emergency vent valve.

F. Tank Openings:

1. All tank openings (interfaces with accessories) shall be threaded fittings with thread protectors.

G. Overfill Protection Valve:

1. The fill pipe shall be fitted with a level control valve which terminates the flow when the fuel level in the tank reaches 85 to 95 percent (adjustable) full. After shut off, product shall be allowed to drain from the highest point so fill nozzle can be removed without spilling. The valve size shall be 2-inch diameter.

2. A lockable fill cap shall be provided.

H. Overfill and Leak Detection Alarm System:

1. The tank unit shall be provided with a float type sensor, part of the overfill protection valve, installed in the tank and pre-set to signal the 90 percent full level fill. The overfill system shall be UL listed and meet the requirements of NFPA 30.

2. A leak detection device shall be installed in the interstitial space. This detector shall sense leakage of fuel. The sensor shall provide signal to the alarm panel.

3. An Alarm panel shall be provided in a location clearly visible to the fuel delivery operator.

4. The panel shall be provided with a lamp (visible in sunny daylight) for each detection signal.

5. The panel shall be provided with a warning horn that sounds continuously when a signal is received from either sensor.

6. The Alarm Panel shall be weatherproof constructed to meet NEMA 4X requirements for this type of application. The panel construction, lights, switches, buttons, etc. shall meet the requirements of Section 16442, Control Panels. Identification of the panel and devices shall meet the requirements of Section 16075, Electrical Identification Nameplates and Warning Signs.

7. Operating Features of the Panel:

a. If a leak or overfill is detected, the sensor shall provide a signal to the panel where an identified lamp will light to show that a leak or overfill has occurred. Two lights are required. This same signal shall continuously sound a single common warning Horn having 80 dB output. The horn shall be silenced by manually activating a override switch. The lamp shall remain lit until the sensor causing the signal goes out of alarm.

I. Tank Insulation:

1. The interstice space between the shells shall be completely filled with a lightweight, monolithic material. The thermal insulation material shall be a composition of perlite, cement, water and special materials recommended by the tank manufacturer.

J. Tank Indicator Gauge:

1. A direct reading "E- F" tank mounted float type indicator gauge shall be provided and located such that it is clearly visible to the fuel delivery operator during filling. This gauge shall provide an indication of the nominal amount of product in the tank. Indicator readout may be in inches, or percent tank fill, or fraction of tank fill.

K. Tank Level Transmitter:

1. Provide an ultrasonic level transmitter to measure fuel tank level. The transmitter output shall be wired to the Plant PLC. The ultrasonic level transmitter shall be as specified in Section 17405, Process Instrumentation and Control, 2.16.D.

L. Combination Pressure /Vacuum Relief Valve and Vent:

1. A minimum 2-inch diameter vent shall be provided, which terminates 12 feet above grade. The normal vent pipe assembly will be shipped loose and installed by the Contractor on site. A pressure/vacuum relief valve shall limit the internal tank pressure to 1 psig and the vacuum to 1 oz psig

M. Spare Openings:

1. A 2-inch diameter capped access port shall be provided. Location of the spare opening shall be per tank manufacturer.

N. Fill Port:

1. The tank fill port shall have an adapter fitting that mate with the fill hose. The adapter fitting shall have a lockable protective cap for use when tank is not being filled.

O. Drop Tube:

1. Drop tube shall be 3-inch diameter aluminum. Tube shall extend to near bottom form submerged fill.

P. Supply Pipe Strainer:

1. The strainer shall be installed at the inlet of the supply pipe, placed at the bottom of the storage tank. Screen shall be brass with 20 mesh stainless steel screen.

2.2 WARRANTY

A. The CONTRATOR warrants to the OCSD that all fuel storage tanks furnished under this Specification shall be new, and of good material and workmanship, and agrees to replace promptly any part or parts which by reason of defective material or workmanship shall fail under normal use, free of negligence or accident, for a minimum of 12 months from date put in operation.

2.3 MANUFACTURERS

A. Highland Tank, Stoystown, PA. B. Southern Tank, Owensboro, KY. C. Or Equal.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Tank shall be installed in strict accordance with the most recent installation instructions provided by the tank manufacturer, PEI/RP200, UFC, NFPA 30, local ordinance, recognized engineering procedure, and other applicable codes.

3.2 TANK UNIT IDENTIFICATION AND INFORMATION SIGNS

A. Signs shall be provided that show the information described below as a minimum. Additional signs may be necessary to meet local county and municipal codes.

1. Manufacturers name.

2. UL listing labels.

3. Date of tank manufacture.

4. Type of product stored in tank, including the API color coded symbol for the product.

5. Working capacity and tank model number.

6. Decals per NFPA 704.

B. Rustproof signs shall be fastened to the tank with suitable rustproof brackets and fasteners. Signs must be removable for repainting the tank.

3.3 MANUFACTURER’S FIELD SERVICES

A. Furnish the services of authorized technical representatives of the Manufacturer to assist/inspect the installed equipment and to certify that the equipment has been properly installed and is ready to operate, train OCSD personnel, conduct pre-operational mechanical checkout of the equipment, place equipment into operation, optimize the performances of the equipment and perform the field performance testing.

B. At a minimum, conduct two separate site visits as follows:

1. A. Inspection of equipment installation (4 hours minimum)

2. B. Training of OCSD personnel. See Specification section 01820 for requirements.

3.4 TESTING

A. Tank shall successfully complete an air pressure test of 5 pounds per inch prior to installation.

3.5 FIELD PAINTING

A. All components shall be shop coated and refer to Section 09800, Protective Coating, for touch up requirements and procedure for compatible system.