420.8 Periodic inspections.

(a)Steam traps and trap piping assemblies shall be inspected for general condition and proper operation at least six times each calendar year at intervals not exceeding ten weeks.#

(b)Blow-off valves and by-pass valves shall be checked for operability immediately prior to closing each associated main valve during a scheduled shut down of a section of the steam distribution pipeline system. Removal of condensate from a shut down section of pipeline must be accomplished prior to re-opening main valves.#

(c)Accessible expansion slip joints shall be inspected at least twice each calendar year at intervals not exceeding 30 weeks. The inspection shall include checks for leakage, proper alignment, and traverse measurement.#

(d)Inside service line valves shall be inspected at the time of periodic meter reading. Valve seals, and warning tags stating that the opening of the service valve must be made only by authorized steam corporation personnel, shall be affixed to each inside service valve. Missing or illegible tags and broken seals must be replaced as soon as possible, but no later than one week, after the condition was discovered. Broken seals, indicating possible unauthorized operation of the valve, shall be investigated to determine cause.#

(e)Manholes containing steam facilities shall be inspected for general conditions and adequacy of insulation at least once each calendar year at intervals not exceeding 15 months and shall be inspected for structural integrity at least once each ten calendar years.#

(f)System pressure telemetering recording devices shall be inspected and tested for accuracy at least twice each calendar year at intervals not exceeding 30 weeks. At a minimum, pressure recording gauges shall be installed at the interface between portions of the system which are designed for different operating pressures.#