Tank outlet fitting with flange

Abstract

An integral metallic fitting for affixing to a liquid retention tank orifice that serves to drain the tank as needed via a bottom wall orifice. The fitting comprises a tubular conduit for liquids outflow of a first diameter, a threaded segment covering the first depending end of the conduit suited for interruptible locking with a separate drain line, and a hollow core, flanged other end provided with an annular ridge disposed about the core which projects into the tank orifice and which ridge is hermetically bonded to the tank wall for safe draining.

1 . An integral fitting for a liquid retention tank adapted for sealing engagement with a tank outflow orifice that is normally provided in a tank lower wall comprising: 
 (a) a generally tubular, rigid conduit means dimensioned to allow flow of viscous fluids therethrough, said conduit means having a first diameter;    (b) an externally threaded, first segment abutting a first longitudinal end of the conduit means, with such threading being adapted for an interruptible locking engagement with a separate drain line;    (c) a hollow core and flanged second segment integral with a second longitudinal end of the conduit means, the second segment also dimensioned to engage and substantially overlap the tank lower wall about the outlet orifice thereof, with the hollow core of the second segment having a second diameter substantially the same as the first diameter of the conduit means; and,    (d) an annular ridge, centrally located upon the upper surface of the second segment, such ridge being dimensioned so as to project a predetermined height into the tank orifice, so as to seat firmly therein and thereby to effect a substantially flush contact with the lower wall of the tank, further with the interface of the annular ridge sidewalls and the orifice sidewalls being adapted to effect their permanent engagement during tank usage.    
   
   
       2 . The fitting of  claim 1  wherein the annular ridge element of the fitting is provided with an outer edge, peripheral chamfer, which chamfer serves upon insertion of the fitting in the orifice periphery to establish an annular channel in the tank bottom wall between the orifice sidewalls and the sidewalls of the ridge, such channel further being adapted to mechanical inter-bonding of the bottom wall and annular ridge.  
   
   
       3 . The fitting of  claim 2  wherein a mechanical bonding of tank lower sidewall and fitting sidewalls is effected by a welding bead, provided in the annular channel established between the outflow orifice and the annular ridge element sidewalls.  
   
   
       4 . The fitting of  claim 1  wherein the first longitudinal end of the conduit means is oriented in the depending configuration and the second longitudinal end of said means is oriented in the upward direction while positioned in the tank lower wall.  
   
   
       5 . The fitting of  claim 1  wherein the inner periphery of annular ridge is substantially coincident with the periphery of the hollow core of the externally threaded, first segment.  
   
   
       6 . The fitting of  claim 1  wherein the tank orifice and an associated fitting are located at plural sites in a bottom wall of the liquids retention tank.