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TITLE 16ECONOMIC REGULATION
PART 1RAILROAD COMMISSION OF TEXAS
CHAPTER 9LP-GAS SAFETY RULES
SUBCHAPTER BLP-GAS INSTALLATIONS, CONTAINERS, APPURTENANCES, AND EQUIPMENT REQUIREMENTS
RULE §9.116Container Corrosion Protection System

(a) In addition to NFPA 58 §§6.6.6.1(H), 6.6.6.2(1), and 6.6.6.3(4), steel containers installed underground, partially underground, or as mounded installations on or after March 1, 2014, shall include a corrosion protection system.

(b) A corrosion protection system shall include the following:

  (1) a container coated with a material recommended for the service that is applied in accordance with the manufacturer's instructions;

  (2) a cathodic protection system that consists of one or more sacrificial anodes or an impressed current anode; and

  (3) a means to test the performance of the cathodic protection system.

(c) Cathodic protection systems installed in accordance with this section shall be monitored by every licensee servicing the container. Such licensees shall document the test results. A successful test shall be confirmed by one of the following results:

  (1) producing a voltage of -0.85 volts or more negative, with reference to a saturated copper-copper sulfate half cell;

  (2) producing a voltage of -0.78 volts or more negative, with reference to a saturated potassium chloride calomel half cell;

  (3) producing a voltage of -0.80 volts or more negative, with reference to a silver-silver chloride half cell; or

  (4) results obtained through any other method described in Appendix D of Title 49 of the Code of Federal Regulations, Part 192.

(d) Sacrificial anodes installed in accordance with subsection (b) of this section shall be tested in accordance with the following schedule:

  (1) upon installation of the cathodic protection system, unless prohibited by climatic conditions, in which case testing shall be completed within 180 days after the installation of the system;

  (2) for continued verification of the effectiveness of the system, 12 to 18 months after the initial test;

  (3) upon successful verification of test results for the tests required in paragraphs (1) and (2) of this subsection, periodic follow-up testing shall be performed at intervals not to exceed 36 months;

  (4) Systems which fail a test prescribed in paragraphs (1) and (2) of this subsection shall be repaired as soon as practical unless climatic conditions prevent such repair, in which case the repair shall be made not more than 180 days thereafter. Systems which fail a test and for which repairs have been made shall comply with the initial and follow-up testing requirements in paragraphs (1) and (2) of this subsection, and the results shall comply with subsection (c) of this section.

(e) Where an impressed current cathodic protection system is installed in accordance with subsection (b) of this section, the licensee shall inspect and test the system in accordance with the following schedule:

  (1) all sources of impressed current at intervals not exceeding two months; and

  (2) all impressed current cathodic protection installations annually.

(f) The licensee shall retain documentation of test results in accordance with §9.4 of this title (relating to Records and Enforcement).

(g) The licensee shall visually examine a container prior to its burial for damage to the coating. Damaged areas shall be repaired with a coating recommended for underground service and compatible with the existing coating.

(h) Partially underground, unmounded containers shall be installed so the aboveground portion of the container complies with NFPA 58 §6.6.1.4.

(i) Steel containers installed underground, partially underground, or as mounded installations on or after March 1, 2014, shall not be filled unless a cathodic protection system is installed in accordance with this section.

(j) Metallic piping and tubing that convey LP-gas from an underground, partially buried, or mounded storage container shall be installed with dielectric fittings to electrically isolate the container from the aboveground portion of the fixed piping system that enters a building.


Source Note: The provisions of this §9.116 adopted to be effective March 1, 2014, 39 TexReg 1119

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