Modular vent assembly for a sewage pumping station

Abstract

Improved modular vent assemblies for filtering and venting gases from a sewage pumping substation. A basic non-filtering vent assembly comprises a concave plastic hood with an internal enclosure, and a stop-ring mounted in the internal enclosure. A rigid grate is secured atop the main conduit, the grate comprising a rigid circular plate with evenly-spaced apertures that forms a filter screen. A plurality of holes about the perimeter of the cap allow it to be secured to the grate by insertion of detent-pins. An enhanced filtering vent assembly comprises a stainless drum with a hinged stainless cover seated atop. The drum is equipped with a central conduit positioned coaxially with the drum by a plurality of louvers. The conduit extends downward past the louvers through a rigid grate (as above) which in this case supports a fill of activated carbon material within the drum. Powered variation of both of the foregoing embodiments are also disclosed in which a blower motor is connected to the modular vent assemblies for inducting sewer gas there through. All the foregoing embodiments provide easy maintenance and replacement of the filter cartridge, do not accumulate water vapor, are not susceptible to blockage or freezing, and may be easily retrofit to most any existing pump station exhaust vent.

1 . A modular vent assembly for venting gases from a sewage pumping substation, comprising: 
 a main conduit;    an annular base for securing said main conduit to a cement foundation;    a cap formed as a concave hood, said cap having an internal enclosure, a stop-ring mounted in said internal enclosure, and a plurality of holes around its perimeter beneath said stop ring;    a rigid grate comprising a rigid circular plate defined by evenly-spaced apertures to form a filter screen, said grate spanning said main conduit and protruding outward therefrom around the main conduit, the internal stop-ring of the cap having a diameter less than that of the grate so that insertion of the cap over the grate is limited by the stop ring.    
   
   
       2 . The modular vent assembly according to  claim 1 , further comprising a plurality of removable pins inserted through said cap beneath said grate for securing said cap on said grate.  
   
   
       3 . The modular vent assembly according to  claim 2 , wherein the evenly-spaced apertures of said grate comprise approximately ½″ diameter apertures.  
   
   
       4 . The modular vent assembly according to  claim 3 , wherein the cap is formed as a concave plastic hood.  
   
   
       5 . The modular vent assembly according to  claim 1 , further comprising a blower motor, said main conduit comprises a T-junction in fluid communication with said blower motor for inducting sewer gas through said modular vent assembly.  
   
   
       6 . A modular vent assembly for venting gases from a sewage pumping substation, comprising: 
 a main conduit for connection to a sewer vent of said sewage pumping substation to vent gas therefrom;    an annular base for securing said main conduit to a cement foundation of said sewage pumping substation;    a cylindrical drum forming an internal enclosure having a top and a bottom, said main conduit passing axially up through said drum and terminating proximate the top;    a concave cover hinged at the top of said cylindrical drum for closing off the top of said drum and directing gas from the vent of said sewage pumping down through said drum;    a plurality of louvers attached axially about said main conduit and coaxially supporting said main conduit in said drum.    a rigid grate comprising a rigid circular plate defined by evenly-spaced apertures to form a filter screen, said grate substantially spanning the bottom of the cylindrical drum except to pass said main conduit; and    a supply of activated charcoal filling a majority of said drum atop said grate.    
   
   
       7 . The modular vent assembly according to  claim 6 , further comprising a latch for securing said cover onto said drum.  
   
   
       8 . The modular vent assembly according to  claim 7 , wherein said latch is a locking latch to prevent removal.  
   
   
       9 . The modular vent assembly according to  claim 6 , wherein the evenly-spaced apertures of said grate comprise approximately ½″ diameter apertures.  
   
   
       10 . The modular vent assembly according to  claim 6 , wherein the cover is formed as a concave stainless steel cover and the drum is formed of stainless steel.  
   
   
       11 . The modular vent assembly according to  claim 5 , wherein the plurality of louvers further comprises four louvers arranged at 90 degree intervals about the main conduit.  
   
   
       12 . The modular vent assembly according to  claim 5 , further comprising a blower motor, said main conduit further comprising a T-junction in fluid communication with said blower motor for inducting sewer gas through said modular vent assembly.  
   
   
       13 . The modular vent assembly according to  claim 12 , wherein said blower motor inducts sewer gas through said modular vent assembly at a velocity of less than 100 feet per minute to ensure a minimum carbon exposure time of one second.  
   
   
       14 . A modular vent assembly for venting gases from a sewage pumping substation, comprising: 
 a skid having vibration damping feet;    a blower motor mounted on said skid    a main conduit formed with a T-junction with a coupling through said skid to a sewer vent of said sewage pumping substation to vent gas there from, and a second coupling attached to said blower motor;    a cylindrical drum forming an internal enclosure having a top and a bottom, said main conduit passing axially up through said drum and terminating proximate the top;    a plurality of legs supporting said drum on said skid;    a concave cover hinged at the top of said cylindrical drum for closing off the top of said drum and directing gas from the vent of said sewage pumping down through said drum;    a plurality of louvers attached axially about said main conduit and coaxially supporting said main conduit in said drum.    a rigid grate comprising a rigid circular plate defined by evenly-spaced apertures to form a filter screen, said grate substantially spanning the bottom of the cylindrical drum except to pass said main conduit; and    a supply of activated charcoal filling a majority of said drum atop said grate.    
   
   
       15 . The modular vent assembly according to  claim 14 , further comprising a locking latch for securing said cover onto said drum.  
   
   
       16 . The modular vent assembly according to  claim 14 , further comprising a plurality of vibration-damping feet attached underneath said skid.  
   
   
       17 . The modular vent assembly according to  claim 14 , wherein the evenly-spaced apertures of said grate comprise approximately ½″ diameter apertures.  
   
   
       18 . The modular vent assembly according to  claim 14 , wherein the plurality of louvers further comprises four louvers arranged at 90 degree intervals about the main conduit.  
   
   
       19 . The modular vent assembly according to  claim 14 , wherein said blower motor inducts sewer gas through said modular vent assembly at a velocity of less than 100 feet per minute to ensure a minimum carbon exposure time of one second.