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Independent Concrete Pipe

Elliptical Pipe

Elliptical pipe is manufactured for special applications.  Horizontal elliptical pipe is sometimes called ‘low head’ because the pipe can be placed where the available head room precludes the use of a standard round section.  Where lateral clearance is limited, a vertical elliptical pipe can be provided.  There is a major difference between horizontal and vertical elliptical pipe in the placement and amount of the reinforcement to resist vertical loading on the pipe. 

Applicable Specifications and Recommended Use

ASTM C 507 Reinforced Concrete Elliptical Culvert, Storm Drain, and Sewer Pipe
C 507 Horizontal Elliptical pipe is used for sizes 18" - 144" equivalent circular sizes with tongue and groove cement mortar or mastic compound joint.  The horizontal elliptical pipe is installed with the major axis horizontal and is used for minimum cover situations or other conditions where vertical clearance problems are encountered.  It offers the hydraulic advantage of greater capacity for the same depth of flow than most other structures of equivalent water-way area.  Loads under similar cover conditions are similar to that of circular pipe with the same span.
 
C 507 Vertical Elliptical pipe is used for sizes 36" - 144" equivalent circular sizes with tongue and groove cement mortar or mastic compound joint.  The vertical elliptical pipe is installed with the major axis vertical and is used for minimum horizontal clearances are encountered or where unusual strength characteristics are desired. Hydraulically, it provides higher flushing velocities under minimum flow conditions and carries equal flow at a greater depth than equivalent horizontal elliptical, arch, or circular pipe. Loads under similar cover conditions are similar to that of circular pipe with the same span.

Joints

Cement Mortar and Mastic Compound
All pipe, special shapes and boxes are available with tongue and groove joints that may be packed with cement mortar, filled with a preformed plastic gasket sealing compound, or a trowel applied mastic compound.  Such joints have a successful experience record and are generally used for storm sewer construction.  Properly applied mastic joint fillers provide flexibility without impairing water tightness.