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S P E C I F I C A T I O N S F O R T U B E S E T T L E R S Y S T E M S |
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ASTM TEST METHOD |
NOMINAL VALUE |
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Specific Gravity |
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Durometer Hardness, Shore D |
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Tensile Strength, psi |
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Tensile Modulus, psi |
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Flexural Strength, psi |
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Flexural Modulus, psi |
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Deflection Temp.@ 264 psi in °F |
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Impact Strength (izod) ft - lbs / inch |
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Drop
Dart, 1/8" Sample ft - lbs / inch |
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The
tube settler module shall be built up of a number of
corrugated sheets with alternately placed flat sheets. The
individual sheets shall be solvent welded to provide strong
continuous bonds and thereby form a durable homogenous
structure with each tube being continuos and imperforate,
eliminating mixing currents that resuspend settled solids
within the tube. The corrugated sheets shall have the
inclined channel configurations molded integrally therein,
so that all the tubes shall have the same angle of
inclination when installed in the basin.
The finished (after thermoforming) thickness of the plastic
used in the modules shall not be less than twenty (20) mils,
and twenty-five mils for the corrugated and flat sheets
respectively. The edges of the plastic shall be clean,
smooth, and free from burrs caused by sawing or trimming the
parts to minimize the possibility of sludge buildup or
growth.
The completed modules shall have a minimum height
of
(19.5") (30")
and
be manufactured to the necessary widths and lengths to
minimize field modification.
The baffles shall be constructed of corrugated fiberglass
reinforced plastic with a
structural
(aluminum) (stainless steel)
frame.
The fiberglass panels shall have corrugations of 2.5" pitch
and 1/2" depth and be 8 oz. material. The panels shall have
the following nominal properties: Glass content 27%
(ASTM-2584-86), Barcol hardness 40-60 (ASTM-2583-81),
flexural strength 22,000 psi (ASTM-790-81), flexural modulus
900,000 psi (ASTM-D-790-81), tensile strength 11,000 psi
(ASTM-D-638-82A).
The
structural
(aluminum) (stainless
steel)
frame shall be fabricated of
(Type 6061-T6) (304SS)
structural shapes. The panels shall be attached by means of
304 stainless steel fasteners to provide an adequate secure
attachment.
The collection troughs shall be constructed of 1/4" minimum
thickness fiberglass reinforced plastic (FRP) consisting of
24 oz. woven roving and a 10 mil surface matt. The trough
shall have a gel coat on all exposed surfaces which is
stabilized against attack by sunlight and all chemicals
involved in the flow stream.
The FRP shall have a ultimate strength of not less than
16,000 psi, flexural strength of not less than 25,000 psi,
flexural modules of elasticity of not less than 838,000 psi,
and a glass content of not less than 30%. The above
characteristics shall be in conformance with ASTM Standards
D638 and D790.
Reinforcing
and stiffener sections shall be designed to meet the load
design characteristics.
The V-notch weir plates shall be constructed of 1/4" thick
cast acrylic material precision machined to the dimensions
shown on the contract drawings. The weir plates shall have
an ultimate tensile strength of 10,000 psi or greater,
flexural strength of not less than 15,000 psi, compressive
strength of 17,000 psi, and a modulus of elasticity of not
less than 450,000 psi. Test methods on these mechanical
characteristics shall be evaluated in accordance with
ASTM-D-638, D-695, and D-790 test methods.
The supports shall be constructed of fabricated
structural (mild
steel) (aluminum) (stainless steel)
(fiberglass)
members and shall have the proper surface preparation as
noted in the Painting Section of the contract
specifications.
All fastening hardware and expansion anchors shall be 304
stainless steel of adequate size to meet the design
requirements.
STRENGTH
The
tube modules shall be capable of supporting their own dead
weight [ 2
ft - (3.5 PSF) (5.5 PSF), 3 FT -
(5.3 PSF) (8.3 PSF)
]
and an additional live load of 10 PSF uniformly distributed.
The minimum design for the support structure shall include
all dead loads resulting from tube modules, supports,
troughs, weirs and baffles, and a uniformly distributed live
load of 10 PSF or a moveable concentrated live load of 250
lbs.
INSTALLATION
The tube settler modules, troughs, weirs and baffles shall
be provided in such configurations as shown on the contract
drawings as to minimize, if not eliminate field trimming,
cutting or modifying and are to be installed as shown on the
drawings, and in accordance with the manufacturer's
recommendations. Care shall be exercised by the contractor
in unloading, transporting and placing tube modules. Tube
modules shall remain in their containers and protected from
environmental extremes until they are installed. Installers
may walk on the tube modules to facilitate installation but
planking should be used to protect edges of the modules from
breakage.
SUBMITTED
MATERIALS
The contractor shall submit detailed drawings showing the
configuration of the tube settler modules and the manner in
which they are to be installed. The installation drawings
shall include detailed instructions to the installer
regarding any field trimming or other modifications required
to fit to the sedimentation basins. Shop drawings shall be
fully dimensioned for construction.
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