Noise abatement module

#Not applicable.

#1. Field of Invention

#This invention relates to a noise abatement system for lowering air velocity in a closed system. Specifically, the invention describes a straight pipe module suppressor, with internal vanes, which reduces the velocity of air used in an industrial airblow cleaning operation.

#FIG. 1 depicts a single inventive noise abatement module.

#FIG. 2 depicts an inlet view of the single noise abatement module of FIG. 1.

#FIG. 3 depicts an outlet view of the single noise abatement module of FIG. 1.

#The present invention comprises the module shown as noise abatement module 10, depicted in FIGS. 1, 2 and 3. Noise abatement module 10 comprises an inside tube 30 that is connected at each end to stubs 24, which are attached to flanges 40. Each flange 40 has a flange face 42 and typically flange bolt holes 44 for mating with and bolting to piping and/or other noise abatement modules 10. Circumferential about inside tube 30 is outside tube 20, defining annular inside space 33. Outside tube 20 has outside tube ends 22 that define the inlet and outlet boundaries of inside space 33 between inside tube 30 and outside tube 20.

#An insulating material 34 may be position in space 33 between inside tube 30 and outside tube 20. When used in noise abatement module 10, insulating material 34 may be supported in place by expanded material 36. Expanded material 36 is rigid enough to hold insulating material 34 in place in space 33, yet is flexible to be shaped around insulating material 34 and inside tube 30, as well as permeable to air. In the exemplary embodiment, the insulating material is a blanket of insulation, typically fiberglass or kaowool. Also in the exemplary embodiment as expanded material 36 is a sheet of wire mesh 34, wrapped around the insulation blanket 34 to hold the insulating material 34 in place between the inner wall of outside tube 20 and the outer wall of inside tube 30.

#The diameters of inside tube 30 and outside tube 20 are any that can accommodate the high velocity airflow to be suppressed. In typical applications of noise abatement module 10 being used to abate noise from industrial pipe and vessel air cleaning, inside tube 30 typically has an inner diameter of 30″ to 38″ (76.2 cm to 96.5 cm), and outside tube 20 typically has an inner diameter of 40″ to 54″ (101.6 cm to 147.2 cm).