in-basin air and liquid piping and supports.
The jet aeration system shall
be designed for continuous operation.
2.6.1
Submerged Jets
**************************************************************************
NOTE: The nozzle size will affect the performance
of the system by changing the water and air mixture.
The standard nozzle size is 40 mm (1-1/2 inches),
however, the process requirements should be checked
to determine proper nozzle size. The number and
size of nozzles is site specific and is effected by
the tank size, solids concentration, oxygen demand
requirements and other factors. Designer should
contact the equipment manufacturer for information
on nozzle sizing.
**************************************************************************
The jet aeration system shall consist of [fiberglass reinforced plastic]
[_____] jet nozzles, oriented in a common direction and attached to a
common manifold. The manifold shall consist of separate liquid and air
piping so that the air and liquid do not mix prior to reaching the mixing
chamber of the jet. The liquid portion of the manifold shall provide
uniform distribution of mixed liquor from the inlet of the manifold to each
of the jets. The jets shall consist of 2 nozzles and a mixing chamber
constructed integrally with the manifold. The primary jet shall direct the
mixed liquor into the mixing chamber where air will be introduced and
combined with the liquid. The air-liquid mixture shall then be discharged
into the secondary nozzle and, hence horizontally into the basin. The two
nozzles shall be carefully molded to maintain proper alignment and
tolerances. To reduce the likelihood of plugging, each jet nozzle shall
have a minimum intake and discharge diameter of 40 mm 1-1/2 inches. The
manifold assembly shall be constructed of [fiberglass reinforced plastic]
[epoxy coated carbon steel] [_____]. The manifold shall be designed to
withstand all normal stresses encountered in shipping, handling and
operation.
2.6.2
Recirculation Pumps
**************************************************************************
NOTE: Select the applicable pump from the following
paragraphs:
**************************************************************************
2.6.2.1
Vertical Propeller Pump
**************************************************************************
NOTE: Vertical propeller pump manufacturer design
manuals should be consulted to determine spacing of
pumps to avoid influence of the pump suctions.
Pumps should be identified on the drawings by a
number. Insert the identification number in part b.
of this paragraph; part b. should be repeated as
necessary for pumps of the same type with different
operating characteristics.
**************************************************************************
a.
General:
The pumping system shall be installed as indicated and
SECTION 11391
Page 25
Previous Page
