Appendix E―Guidance on Determining High Consequence Areas and on Carrying out Requirements in the Integrity Management Rule

(I)I. Guidance on Determining a High Consequence Area#

To determine which segments of an operator's transmission pipeline system are covered for purposes of the integrity management program requirements, an operator must identify the high consequence areas. An operator must use Method (1) or (2) from the definition in §3303 to identify a high consequence area. An operator may apply one method to its entire pipeline system, or an operator may apply one method to individual portions of the pipeline system. (Refer to Figure E.I.A for a diagram of a high consequence area).#

II.Guidance on Assessment Methods and Additional Preventive and Mitigative Measures for Transmission Pipelines#

(1)1. Table E.II.1 gives guidance to help an operator implement requirements on additional preventive and mitigative measures for addressing time dependent and independent threats for a transmission pipeline operating below 30 percent SMYS not in an HCA (i.e., outside of potential impact circle) but located within a Class 3 or Class 4 Location.#

(2)2. Table E.II.2 gives guidance to help an operator implement requirements on assessment methods for addressing time dependent and independent threats for a transmission pipeline in an HCA.#

(3)3. Table E.II.3 gives guidance on preventative and mitigative measures addressing time dependent and independent threats for transmission pipelines that operate below 30 percent SMYS, in HCAs.#

Table E.II.1: Preventative and Mitigative Measures for Transmission Pipelines Operating below 30 Percent SMYS Not in an HCA but in a Class 3 or Class 4 Location#

(Column 1)#

Threat#

Existing Subpart 3 Requirements#

(Column 4)#

Additional (to Subpart 3 requirements)#

Preventive and Mitigative Measures#

(Column 2)#

Primary#

(Column 3)#

Secondary#

External Corrosion#

2107(Gen. Post 1971)#

2109(Gen. Pre1971)#

2111(Examination)#

2113(Ext. coating)#

2115(CP)#

2117(Monitoring)#

2119(Elect isolation)#

2121Test stations)#

2123(Test leads)#

2125(Interference)#

2131(Atmospheric)#

2133-(Atmospheric)#

2137(Remedial)#

2905(Patrol)#

2906(Leak survey)#

2911 (Repairgen.)#

2917(Repairperm.)#

2703(Gen Operation)#

2713(Surveillance)#

For Cathodically Protected Transmission Pipeline:#

Perform semi-annual leak surveys.#

For Unprotected Transmission Pipelines or for Cathodically Protected Pipe where Electrical Surveys are Impractical:#

Perform quarterly leak surveys#

Internal Corrosion#

2127(Gen IC),#

2129(IC monitoring)#

2137(Remedial),#

2905(Patrol)#

2906(Leak survey),#

2911-(Repair gen.)#

2917(Repair perm.)#

703(A)(Materials)#

2703(Gen Operation)#

2713(Surveillance)#

Perform semiannual leak surveys.#

3rd Party Damage#

903(Gen. Design),#

911(Design factor)#

1717(Hazard prot),#

1727(Cover)#

2714(Dam. Prevent),#

2716(Public education)#

2905(Patrol),#

2907(Line markers)#

2911-(Repair gen.),#

2917(Repair perm.)#

2715(Emerg. Plan)#

Participation in state onecall system,#

Use of qualified operator employees and contractors to perform marking and locating of buried structures and in direct supervision of excavation work, AND#

Either monitoring of excavations near operator's transmission pipelines, or bimonthly patrol of transmission pipelines in class 3 and 4 locations. Any indications of unreported construction activity would require a follow up investigation to determine if mechanical damage occurred.#

Table E.II.2 Assessment Requirements for Transmission Pipelines in HCAs (Reassessment intervals are maximum allowed.)#

ReAssessment Requirements (see Note 3)#

At or above 50 Percent SMYS#

At or above 30 Percent SMYS#

up to 50 Percent SMYS#

Below 30 Percent SMYS#

Baseline Assessment Method (see Note 3)#

Max Re-Assessment Interval#

Assessment Method#

Max Re-Assessment Interval#

Assessment Method#

Max Re-Assessment Interval#

Assessment Method#

Pressure Testing#

7#

CDA#

7#

CDA#

Ongoing#

Preventative & Mitigative (P&M) Measures (see Table E.II.3), (see Note 2)#

10#

Pressure Test or ILI or DA#

Repeat inspection cycle every 10 years#

15 (see Note 1)#

Pressure Test or ILI or DA (see Note 1)#

Repeat inspection cycle every 15 years#

20#

Pressure Test or ILI or DA#

Repeat inspection cycle every 20 years#

In-Line Inspection#

7#

CDA#

7#

CDA#

Ongoing#

Preventative & Mitigative (P&M) Measures (see Table E.II.3), (see Note 2)#

10#

ILI or DA or Pressure Test#

Repeat inspection cycle every 10 years#

15 (see Note 1)#

ILI or DA or Pressure Test (see Note 1)#

Repeat inspection cycle every 15 years#

20#

ILI or DA or Pressure Test#

Repeat inspection cycle every 20 years#

Direct Assessment#

7#

CDA#

7#

CDA#

Ongoing#

Preventative & Mitigative (P&M) Measures (see Table E.II.3), (see Note 2)#

10#

DA or ILI or Pressure Test#

Repeat inspection cycle every 10 years#

15 (see Note 1)#

DA or ILI or Pressure Test (see Note 1)#

Repeat inspection cycle every 15 years#

20#

DA or ILI or Pressure Test#

Repeat inspection cycle every 20 years#

Note 1: Operator may choose to utilize CDA at year 14, then utilize ILI, Pressure Test, or DA at year 15 as allowed under ASME B31.8S#

Note 2: Operator may choose to utilize CDA at year 7 and 14 in lieu of P&M#

Note 3: Operator may utilize "other technology that an operator demonstrates can provide an equivalent understanding of the condition of line pipe"#

Table E.II.3#

Preventative and Mitigative Measures addressing Time Dependent and Independent Threats for Transmission Pipelines that Operate below 30 Percent SMYS, in HCAs#

Threat#

Existing Subpart 3 Requirements#

Additional (to Subpart 3 requirements) Preventive and Mitigative Measures#

Primary#

Secondary#

External Corrosion#

2107(Gen. Post 1971)#

2109(Gen. Pre1971)#

2111(Examination)#

2113(Ext. coating)#

2115(CP)#

2117(Monitoring)#

2119(Elect isolation)#

2121Test stations)#

2123(Test leads)#

2125(Interference)#

2131(Atmospheric)#

2133(Atmospheric)#

2137(Remedial)#

2905(Patrol)#

2906(Leak survey)#

2911-(Repairgen.)#

2917(Repairperm.)#

2703(Gen Oper)#

2713(Surveil)#

For Cathodically Protected Trmn. Pipelines#

Perform an electrical survey (i.e., indirect examination tool/method) at least every seven years. Results are to be utilized as part of an overall evaluation of the CP system and corrosion threat for the covered segment. Evaluation shall include consideration of leak repair and inspection records, corrosion monitoring records, exposed pipe inspection records, and the pipeline environment.#

For Unprotected Trmn. Pipelines or for Cathodically Protected Pipe where Electrical Surveys are Impracticable#

Conduct quarterly leak surveys AND#

Every 1 1/2 years, determine areas of active corrosion by evaluation of leak repair and inspection records, corrosion monitoring records, exposed pipe inspection records, and the pipeline environment.#

Internal Corrosion#

2127(Gen IC)#

2129(IC monitoring)#

2137(Remedial)#

2905(Patrol)#

2906(Leak survey)#

2911-(Repairgen.)#

2917(Repairperm.)#

703(A)(Materials)#

2703(Gen Oper)#

2713(Surveil)#

Obtain and review gas analysis data each calendar year for corrosive agents from transmission pipelines in HCAs,#

Periodic testing of fluid removed from pipelines. Specifically, once each calendar year from each storage field that may affect transmission pipelines in HCAs, AND#

At least every seven years, integrate data obtained with applicable internal corrosion leak records, incident reports, safety related condition reports, repair records, patrol records, exposed pipe reports, and test records.#

3rd Party Damage#

903(Gen. Design)#

911(Design factor)#

1717(Hazard prot)#

1727(Cover)#

2714(Dam. Prevent)#

2716(Public educat)#

2905(Patrol)#

2909(Line markers)#

2911-(Repairgen.)#

2917(Repairperm.)#

2715(Emerg Plan)#

Participation in state onecall system,#

Use of qualified operator employees and contractors to perform marking and locating of buried structures and in direct supervision of excavation work, AND#

Either monitoring of excavations near operator's transmission pipelines, or bimonthly patrol of transmission pipelines in HCAs or Class 3 and 4 locations. Any indications of unreported construction activity would require a follow up investigation to determine if mechanical damage occurred.#

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:501 et seq.#

HISTORICAL NOTE: Promulgated by the Department of Natural Resources, Office of Conservation, Pipeline Division, LR 30:1289 (June 2004), amended LR 31:690 (March 2005).#