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SPECIFICATION HOME | DOWNLOAD WORD DOCUMENT EPOXY-COATED, FLAT PANEL (FP) BOLTED DRY STORAGE TANK SPECIFICATIONS
PART 1 - GENERAL
1.1 Scope of Work
A. Furnish and erect epoxy coated, flat panel bolted-steel storage tank, including tank structure and tank appurtenances as shown on the contract drawings and described herein.
B. All required labor, materials and equipment shall be included.
C. Tanks will be designed to be self-supporting on customer supplied foundation or structure.
1.2 Qualifications of Tank Supplier
A. Tank supplier shall have minimum five years experience in similar type projects.
B. Manufacturer shall be specialized in the design, fabrication and erection of factory applied epoxy powder coated, bolt together tank systems. The manufacturer shall fabricate and coat the tank in the same facility which it owns and operates.
C. Tank supplier shall supply certified erectors with minimum five years experience in bolted FP tank installation. The tank erectors must be employed by the tank supplier. Subcontract erectors will not be allowed.
D. The supplier shall provide turnkey responsibility for the tank design, material supply and field installation service.
E. Strict adherence to the standards of design, fabrication, erection, product, quality, and long-term performance, established in this specification will be required by the Owner and Engineer.
F. Tank supplier shall be Tank Connection, BOSS Tank or approved equal.
1.3 Submittal Drawings and Specifications
A. Construction shall be governed by the Owner’s drawings and specifications showing general dimensions and construction details, after written approval by the Engineer of detailed erection drawings prepared by the tank vendor. There shall be no deviation from the drawings and specifications, except upon written order from the Engineer.
B. The bidder is required to furnish, for the approval of the Engineer and at no increase in contract price, ____ sets of complete specifications and construction drawings for all work not shown in complete detail on the bidding drawings.
C. The approval by the Engineer of the tank vendor’s drawings shall be an approval relating only to their general conformity with the bidding drawings and specifications and shall not guarantee detail dimensions and quantities, which remains the vendor’s responsibility.
PART 2 - PRODUCTS
2.1 General Information
A. Owner / client reference B. Jobsite location – City, State, Zip Code C. Bulk material stored D. Loose density of product – pounds per cubic foot E. Maximum compacted product density – pounds per cubic foot F. Product angle of repose – degrees G. Required working capacity of each tank – cubic feet or tonnage H. Tank size - diameter and height I. Configuration – skirt support design or tank elevated on structural steel J. Hopper slope – specify degrees K. Clearance from foundation to hopper discharge L. Design loads – mass flow, funnel flow, expanded flow M. Operating pressure and vacuum – ounces per square inch N. Dust collector and/or equipment loads O. Roof live load – PSF P. Seismic zone – per IBC 2003, requires zip code Q. Standard wind design - per IBC 2003
2.2 Design Criteria
A. Standard wind design is 90 MPH wind velocity per IBC 2003. B. Seismic Design is to be based on the 2003 edition of the International Building Code. When designing a tank in a seismic zone, the load producing the higher stresses comparing wind and seismic will control the dynamic portion of design.
C. Combined live and dead roof load shall be uniformly distributed with all nozzle, manhole, and filter locations designed for a minimum of 200 lbs each. Live and dead loads to be combined minimum of 25 psf. Roof to have 1:12 slope for water drainage.
D. Shell and Hopper Design
1. Shell and hopper product pressures are calculated using the technical paper Effect of Solid Flow Properties and Hopper Configuration on Silo Loads, by Jenike, A.W. Jenike and Johanson, Inc. The analysis uses the Janssen formula for defining pressures and load imposed by funnel or mass flow. Radial tension in the shell, from the above mentioned product loads, are from the Design of Steel Bins for Storage Of Bulk Solids, Gaylord and Gaylord, Section 8-2. Loadings in the hopper, from the above mentioned product loads, are from the Design of Steel Bins For Storage of Bulk Solids, Gaylord an Gaylord, Sections 5-12, 8-6.
2. Allowable stresses for carbon steel are per the AISC Manual of Steel Construction. Allowable Stress Design, 9th Edition and ASTM for carbon steel materials. Weld joint efficiencies are per ASME Section VIII, Division I, Table UW-12.
3. Shell design is based on the critical buckling formula for a long cylinder from the book Structural Analysis Of Shells, by Baker, Kovalevsky, & Rish, pg 230. The shell material’s critical buckling stress is not allowed to exceed its yield strength.
4. Shell resistance to radial tension from dry product pressure is based on the principles of API 620, Section 3.10 with resisting seam loads based on the principles of AWWA D103.
5. Hopper resistance to tension from dry product pressure is based on the principles of API 620 Section 3.10 with resisting seam loads based on the principles of AWWA D103. The hopper to sidewall connection design is based on the principles of API 620 Section 3.12.
6. Deck sheet design under internal pressure is based on the principles of API 620 Section 3.10. The deck to sidewall connection under internal pressure is based on API 650 App. F.
7. Shell design under vacuum is based on the critical buckling formula from the book Structural Analysis of Shells, by Baker, Kovalevsky & Rish, pg. 251.
8. Sidewall panels shall be flat panel (FP) tapered design, utilizing lap joint panel connections. Formed flanged panels will not be allowed.
E. Tank shall be designed for (center fill) (off-center fill) (center discharge) (off-center discharge) of product.
F. Tank design pressure shall be 4.5 oz per square inch positive and .5 oz per square inch negative (positive pressure decreases as tank diameter increases) (design tank for atmospheric pressure).
G. Tank design to be based on a level full capacity using the maximum compacted density of the product.
H. Owner solicits recommendations that may improve the price, delivery, or performance of tanks. As an alternate, Vendor is invited to quote changes in physical dimensions, modifications to the design, fabrication, or stock of Vendor’s standard equipment that would reduce the initial cost of the equipment as specified without changing the design premise. Alter quotations shall be listed as such in the proposal specifying the alternate and the price and delivery for the alternate.
2.3 Material Specifications
A. Plates and Sheets
1. Design requirements for mild strength steel shall be ASTM A36 or ASTM A1011 Grade 30, 36, 40, or 50.
2. Design requirements for high strength steel shall be ASTM A1011 Grade 42, 50, 55, or 60.
B. Rolled Structural Shapes
1. Material shall conform to minimum standards of ASTM A36 or AISI 1010. C. Bolt Fasteners 1. Bolts shall be 1/2 inch diameter and shall be Grade 8 (150 ksi) min. 2. Anchor bolts conform to ASTM A36 or A307. 3. Other bolts shall meet or exceed ASTM A307 or ASTM325. 4. Bolt coating is JS 500 electro-plating. D. Gaskets 1. Bolted connections shall incorporate white EPDM gasket or Viton material. F. Appurtenances/Accessories 1. Standard Accessories · 3’ x 6’8” walk-in door in skirt with louver · 20” center roof dome with cover plate · Foundation anchor bolts and clips · Hardware and gasket for assembly of tank 2. Optional Accessories · Product material testing to ensure reliable flow · Double door access in skirt – 6’ (wide) x 6’8” (height) · 12’ (wide) x 14’ (height) truck drive-through openings in skirt · Hillside flange in deck for mounting filter (size & weight required) · Hopper manway (manway with bolt-on cover) (hinged style) (quick access) · Stub and flanged nozzles in deck and sidewall – specify quantity and size · Level indicator nozzles/couplings/openings – specify quantity and size · Complete fill pipe assembly (aluminum, stainless, carbon steel) · TC target box located in tank center dome · Deck manway access (20” snap lock) (20” combination manway ventilator) (20” combination manway PRV) (24” combination manway PRV) · Special hopper transition outlet – specify size · Deck perimeter guardrail with toe board (OSHA) · Outside ladder with safety enclosure and rest platform(s) (OSHA) · Spiral stairway access to top of tank (OSHA) · Maintenance platforms – specify size and location · Crossovers for access between tanks (OSHA) – specify span between tanks
PART 3 - COATING SPECIFICATION
3.1 Epoxy Coating
A. Surface Preparation
1. Following the shearing process, sheets shall be steel grit blasted on both sides to the equivalent of SSPC-SP10. Sand blasting and chemical pickling of steel sheets is not acceptable.
2. All sheets shall be powder coated immediately after steel grit blasting.
B. Cleaning
1. After fabrication and prior to application coating system, all sheets shall be thoroughly cleaned by a caustic wash and a hot rinse process followed immediately by drying.
2. Inspection of the sheets shall be made for traces of foreign matter or rust. Any such sheets shall be recleaned or grit blasted to an acceptable level of quality.
C. The color selected for the exterior coating shall be approved by the Engineer prior to commencement of coating.
D. Interior Coatings 1. Fusion 5000 FBE™ (epoxy powder) - 5 mils avg. DFT E. Exterior Coatings 1. Fusion 5000 FBE™ (epoxy powder) – Exterior primer - 3 mils avg. DFT 2. Polyurethane – Exterior finish coat (per color selection) - 2 mils avg. DFT 3.2 Factory Inspection
A. Coated sheets shall be inspected for mil thickness (Mikrotest or equal).
B. An electrical leak detection test shall be performed on the inside surface after fabrication of the sheet.
3.3 Packaging
A. All sheets that pass Factory Inspection and Quality Control checks shall be protected from damage prior to packaging for shipment.
B. Heavy paper or plastic foam sheets shall be placed between each panel to eliminate sheet-to-sheet abrasion during shipment.
C. Individual stacks of panels will be banded or bolted to special wood pallets built to roll-radius of the tank panels. This procedure eliminates contact or movement of finished panels during shipment.
D. Shipment from the factory will be by truck, hauling the tank components exclusively.
PART 4 - EXECUTION
4.1 Installation
A. Installation shall be completed using the ground jacking system insuring safer working conditions. The tank shall be erected starting from the top of the tank working toward the bottom of the tank.
4.2 Tank Supplier Warranty
A. The tank supplier shall include a warranty for the tank materials, coating system and field installation service. As a minimum, this warranty shall provide assurance against defects in material, coatings and workmanship for a period of one year.
B. Tank supplier shall provide a non-leak warranty on field installation service.
END OF SECTION
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