Section 27-712. Concrete-filled pipe piles

(a) Materials. The pipe shall
  conform to the provisions of reference standard RS 11-8. Concrete  shall
  conform  to  the  requirements of article five of subchapter ten of this
  chapter.
    (b) Minimum dimensions. (1)  Pipe  installed  open-end  and  having  a
  nominal  outside diameter of less than fourteen inches shall be at least
  one-quarter inch thick. For diameters from fourteen inches  to  eighteen
  inches,  the  minimum  thickness  shall  be 0.310 in. For diameters over
  eighteen inches, the minimum thickness shall be 0.375 in.
    (2) Steel pipe piles installed with ends closed shall have  a  minimum
  nominal wall thickness of at least 0.125 in.
    (3)  For  piles  which  receive  their  principal support by friction,
  closure or splice plates shall not project more than three-eighths of an
  inch beyond the outer limit of the pipe section.
    (c) Installation.
    (1) Pipe shells driven open-end shall be cleaned to the bottom of  the
  shell after driving.
    (2)  After driving and cleaning the pipe, open-end piles driven to end
  bearing on rock  or  hardpan  shall  be  reseated  to  full  bearing  by
  redriving,  to the resistance indicated in table 11-4. If the pipe shell
  shows two inches or more of penetration on redriving, the pipe shall  be
  recleaned  and  redriven  in  successive cycles until the penetration on
  redriving is less than two inches.
    (3) Pipe shells shall be inspected before filling with concrete, shall
  be clean, and shall meet the requirements for alignment and condition of
  the shell as specified with regard to the shells of cast-in-place piles.
  If leakage of water into the pipe occurs, the  provisions  of  paragraph
  five of subdivision (e) of section 27-713 of this article shall apply.
    (4)  Placing  of  concrete  fill  in  pipe shells shall conform to the
  requirements for placing concrete fill in cast-in-place piles.