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SPECIFICATION
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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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