New York Codes, Rules and Regulations › Title 16 - DEPARTMENT OF PUBLIC SERVICE › Chapter III - GAS UTILITIES › Subchapter C - Safety › Part 255 - Transmission And Distribution Of Gas › Requirements for Corrosion Control › Section 255.465 - External corrosion control: monitoring

Current through Register Vol. 46, No. 28, July 10, 2024
(a) Pipe-to-soil electrical potential tests
					 or other acceptable electrical tests shall be conducted over each pipeline 100
					 feet (30.5 meters), or longer that is under cathodic protection at least once
					 each calendar year, but with intervals not exceeding 15 months, to determine
					 whether the cathodic protection meets the requirements of section
					 255.463 
					 of this Part. These should also be conducted for pipelines shorter than 100
					 feet (30.5 meters). However, if tests at those intervals are impractical for
					 separately protected short sections of mains or transmission lines, not in
					 excess of 100 feet (30.5 meters), or separately protected service lines, these
					 pipelines may be surveyed on a sampling basis. At least 10 percent of these
					 protected structures, distributed over the entire system must be surveyed each
					 calendar year, with a different 10 percent checked each subsequent year, so
					 that the entire system is tested in each 10-year period.
(b) Each cathodic protection rectifier or
					 other impressed current power source must be inspected six times each calendar
					 year, but at intervals not exceeding 21/2 months, to ensure that it is
					 operating.
(c) Each reverse current
					 switch, each diode, and each interference bond whose failure would jeopardize
					 structure protection must be electrically checked for proper performance six
					 times each calendar year, but at intervals not exceeding 21/2 months. Each
					 other interference bond must be checked at least once each calendar year, but
					 at intervals not exceeding 15 months.
(d) Each operator shall take prompt remedial
					 action to correct any deficiencies indicated by the monitoring.
(e) After the initial evaluation required by
					 sections
					 255.455(b)-(c) and
					 255.457(b) 
					 of this Part, each operator must, not less than every three years, at intervals
					 not exceeding 39 months, reevaluate its unprotected pipelines and cathodically
					 protect them in accordance with this Part in areas in which active corrosion is
					 found. The operator must determine the areas of active corrosion by electrical
					 survey. However, on distribution lines and where an electrical survey is
					 impractical on transmission lines, areas of active corrosion may be determined
					 by other means that include review and analysis of leak repair and inspection
					 records, corrosion monitoring records, exposed pipe inspection records, and the
					 pipeline environment.
(f) The
					 operator shall determine the areas of active corrosion by electrical survey, or
					 where electrical survey is impractical, by using the required leakage survey
					 (see section
					 255.723[b] 
					 of this Part) in conjunction with an analysis of the corrosion and leak history
					 records, or by other approved means.