Flat Tank Covers – Formed
[tab_item title=”PART 1 GENERAL”]1.1 SCOPE
Provide Aluminum Flat Cover – Formed and all accessories as specified herein and on the contract drawings.
1.2 RELATED SECTIONS
Responsible for all related Sections found in Divisions 1 – 16.
A submittal shall be provided to the engineer and approved prior to fabrication. Submittal for approval includes:
Submittal drawings to show size, location, and spacing of all parts; each connection type and fastener.
Operation & Maintenance Manual.
All Structural Calculations shall be sealed by a Professional Engineer.
1.4 QUALITY ASSURANCE
The manufacturer shall have five years experience on similar projects.
Manufacturer and Contractor to coordinate installation to provide a successful install.
Contractor required to use skilled workmen familiar with this type of erection.
The cover system shall be guaranteed for a period of one year against defective material and fabrication.[/tab_item]
[tab_item title=”PART 2 PRODUCTS”]
RPS Engineering, Inc. of Elgin , Illinois , (800) 931-1950; approved other.
2.2 GENERAL REQUIREMENTS
The cover is a clear-span structure supported by the specified tank structure.
Individual panels alternately mate with adjacent panel, and overlap the support structure.
No more than the adjacent panels need removal to remove any one panel.
Each panel is one welded assembly; comprised of a formed panel, stiffeners on underside, and non-skid surface (optional).
Handles, bolts and hinges that pose no tripping hazard.
Dead load of individual removable panels not to exceed 150 lbs.
All dissimilar surfaces are separated by gasket or sealant.
All mating and bearing surfaces are gasketed, forming a mostly air-tight system.
The cover must be sealed enough to allow the odor control system to work properly, but allow for air intake. A safety intake should also be present.
No appreciable water ponding allowed.
2.3 DESIGN REQUIREMENTS
Aluminum Association Specifications for Aluminum Structures shall be the reference standard for determining allowable loads and stress limitations for the aluminum cover. Specify the following loading criteria:
Live Load (20 – 50 psf) typical or as specified
Snow Load (20 – 40 psf) typical or as specified
Wind Load (90 – 100 mph) typical or as specified
Seismic Zone, Design Response Spectrum, Importance Factor as specified by governing code
Cover panels designed to sustain each load:
Uniform Loads: (20 – 100 psf) typical over the total panel or as specified
Concentrated Load: 250 lbs over 1 sq. ft. area of the panel anywhere or as specified
Load Combinations: Per Governing Code
ASCE 8-90 gives safety factors for stainless steel bolts and anchors.
ASTM F593 gives minimum strength of material for stainless steel bolts and anchors.
Design the cover for thermal expansion and contraction over the ambient temperature of range of -30° F to +140° F.
Extrusions: 6061-T6, 6063-T52, 6005A-T6
Plate: 3003, 5052, 6061, 7075
Sheet: 3003, 5052, 6061, 7075
Composite: Clear acrylic composite
Fasteners: 316 Series Stainless Steel
Anchors: 316 Series Stainless Steel
Hardware: 300 Series Stainless Steel
Gaskets: Neoprene or approved other
Sealant: Silicone, Silpruf or approved other
Doors, Hatches, Vents, Flanged Connections: 3003, 5052, 6061, Stainless
[tab_item title=”PART 3 EXECUTION”]
3.1 FIELD MEASUREMENTS
Contractor shall field verify all dimensions prior to fabrication of cover.
3.2 DELIVERY, STORAGE AND HANDLING
Contractor shall be responsible for unloading, storing and handling cover.
Contractor shall be responsible for installing the cover per manufacturer’s directions. Only competent workmen familiar with this type of erection shall be used. The cover shall be erected level and plumb, and to be true within the specified construction tolerances; no cumulative dimensional error is allowed.
Prior to installation, the erector shall check all design dimensions as shown on drawings. Any discrepancies between the field dimensions and design dimensions shall be brought to the attention of RPS Engineering. No installation shall proceed until site conditions are remedied to the point that the cover will be installed correctly. Any remedies are not the responsibility of the cover manufacturer.
The erector shall furnish all equipment to install the cover in place. All bolted and anchored connections for the cover shall be made by means of bolting material specified and as noted on the drawings.
The cover shall not be modified in any manner without first consulting RPS Engineering.
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