2.7.1
Shop Hydrostatic Test
Prior to applying coatings, perform hydrostatic test at atmospheric
pressure by filling separator with water in the shop for a minimum of 4
hours. Testing shall be conducted after all seams have been cleaned and all
welds have been inspected in accordance with ASTM E 165. Acceptance
criteria, for the hydrostatic test, is no leakage after 4 hours using a
thorough visual inspection for the leaks.
2.7.2
Reduction of Solids
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NOTE: Designer shall address special influent
characteristics as part of the design when using
this specification. Special characteristics
include, but are not limited to, inflow rate, grit
content, viscosity of petroleum product, AFFF foam,
heavy metals, and reverse emulsion. Determine need
for a solid waste basin preceding the separator and
specify solid waste basin requirements when required
by site conditions.
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NOTE: If total solids are less than 100 mg/L, these
elements may be eliminated after adequate benchscale
testing has been completed to support this
conclusion. Designer shall indicate run of solids
removal line from outlet nozzle to a point above
grade.
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Inlet compartment shall reduce [suspended] [settleable] solids to
nonclogging level for parallel plates [or vertical tubes,] and provide a
uniform oily wastewater hydraulic loading across inlet face of oil
coalescing compartment, under laminar flow conditions. Equip compartment
with an inlet nozzle with wastewater sampling port, nonclogging flow
distributor and energy dissipator device, [primary solids collection
hopper,] [primary solids outlet nozzle,] [oil retention weir,] [adjustable
surface oil overflow weir with trough,] [primary oil outlet nozzles]. [The
oil-water separator shall be preceded by a solid water basin which includes
a removable solids or trash basket. Equip the solid water basin with a
hoist for servicing the trash basket. Size the basket to retain all solids
larger than 75 mm 3 inches in any dimensions. The solid waste basin shall
have a minimum storage volume of [945] [_____] liters [250] [_____] gallons.]
2.7.3
Oil Coalescing Compartment
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NOTE: The interpretation of "easily removable" has
two meanings in the industry. One is the complete
removal of the entire bundle from the separator; the
second is removal of individual 300 mm square one
foot square bundles. The designer shall adapt the
specification to the specific demands of the project.
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Equip oil coalescing compartment with easily removable and reinstallable,
parallel, corrugated plates [, or vertical tubes] arranged to optimize
SECTION 11311
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