Section 27-949. Protection of standpipe system

(a)  All  parts  of the
  standpipe systems that may be exposed to frost shall be  protected  from
  freezing by any one of the following methods:
    (1)  The piping shall be frostproofed with insulation having a thermal
  conductance of 0.1 Btu/hr. per square foot of surface per degree F at  a
  mean  temperature of seventy to seventy-five degrees F. Insulation shall
  be protected to prevent water infiltration,  and  when  exposed  to  the
  weather  the insulation shall be covered with a forty-five pound roofing
  felt jacket or equivalent.
    (2) Steam or electric tracers may be  used  in  conjunction  with  the
  insulation.
    (b) Tanks subject to freezing temperatures shall be protected.