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PHMSA NTSB Recommendations

The Pipeline and Hazardous Materials Safety Administration is required by law to respond to safety recommendations issued by the National Transportation Safety Board (NTSB), an independent federal agency charged by Congress with investigating transportation incidents. Recommendations usually address a specific issue uncovered during an investigation or study and specify how to correct the situation.

Open Recommendations

The NTSB classifications for open recommendations:

OAA - Open Acceptable Action
OAAR - Open Acceptable Alternate Response
OUA - Open Unacceptable Response
ORR - Open Response Received
OAR - Open Await Response
IRR - Initial Response Received


A - Air
H - Highway
P - Pipeline
R - Rail

Currently Open Recommendations

PHMSA NTSB Safety Recommendations
Description Issue Date
H-04-023 Nurse Tank Inspections; OUA July 1, 2004
H-11-005 Cargo Tank Performance Standards; OAA September 2, 2011
H-11-006 Cargo Tank Performance Standards; OAA September 2, 2011
M-21-14 Eliminate the exceptions provided in Title 49 Code of Federal Regulations 176.905(i) for used and damaged flammable-liquid-powered vehicles transported by roll-on/roll-off vehicle carriers; OAR December 16, 2021
P-11-009 PG&E Rupture - Immediate 911 Notifications; OAAR September 26, 2011
P-11-010 PG&E Rupture - Equipping SCADA Systems; OAA September 26, 2011
P-11-011 PG&E Rupture - Installing ACVs or RCVs; OAA September 26, 2011
P-12-003 Enbridge - Engineering Assessment of Cracks; OUA July 25, 2012
P-19-14 Require overpressure protection for low pressure natural gas distribution systems that cannot be defeated by a single operator error or equipment failure; OAA October 24, 2019
P-21-01 Expand incident reporting requirements in 49 CFR Part 191 so that events that may meet the definition of "incident" are immediately reported to the National Response Center even when source of natural gas has not been determined; OAAR Feburary 8, 2021
P-21-02 As of 7/8/22, Evaluate industry's implementation of the gas distribution pipeline integrity management requirements and develop updated guidance for improving their effectiveness; OAA Feburary 8, 2021
P-21-03 Assist the Railroad Commission of Texas in conducting the audit recommended in Safety Recommendation P-21-4; OAA Feburary 8, 2021
P-21-18 In collaboration with Coastal and Marine Operators and the Council for Dredging and Marine Construction Safety, develop recommended practices and processes for pipeline operators and dredging companies to obtain and use accurate pipeline location data during planning and one-call locating activities for pipelines both in and near project locations; OAA December 21, 2021
P-21-19 In collaboration with Coastal and Marine Operators and the Council for Dredging and Marine Construction Safety, develop guidance for 2 excavators to clearly identify proposed dredging boundaries for dredging projects before notifying one-call centers by either physically marking the boundaries where practicable, or identifying the boundary with accurate location data; OAA December 21, 2021
P-21-20 Include criteria for minimum tolerance or safety zones for dredging in state pipeline safety program evaluation guidelines; OAA December 21, 2021
R-07-004 Immediate Notification to Emergency Responders; OAA April 25, 2007
R-12-007 Adoption of American Association of Railroads (AAR) center sill or draft sill attachment designs; OAA March 2, 2012
R-14-014 Commodity Flow Data and Emergency Response Plan Development; OUA August 22, 2014
P-15-017 Evaluate relationship between incident occurences; OAA February 10, 2015
R-17-001 Evaluate risks posed to train review re: separation distance; OAA March 9, 2017
R-17-002 Withdraw regulatory interpretation for positioning placarded rail cars; OAA March 9, 2017
P-17-001 Work with pipeline trade and standards organizations to modify pipeline dent acceptance; OAA June 15, 2017
P-17-002 Require operators to either (a) repair all excavated dent defects or (b) install a local leak detection system; OUA June 15, 2017
H-18-003 With FMCSA, develop and implement process to ensure cargo tank inspectors able to verify safety; OUA January 30, 2018
H-18-004 With FMCSA incorporate by reference registered inspector training requirements for cargo tanks inspectors; OAA January 30, 2018
H-18-005 With FMCSA permit suspension or revocation of registration of highway cargo tank inspectors; OAA January 30, 2018
R-19-002 Prohibit the use of those tank cars transporting poison inhalation hazard/toxic inhalation hazard materials that are constructed of nonnormalized steels and not constructed of steels meeting the highest available fracture toughness specifications; OAA February 14, 2019
P-19-001 Require that all new service regulators be installed outside occupied structures; OAAR June 10, 2019
P-19-002 Require existing interior service regulators be relocated outside occupied structures whenever the gas service line, meter, or regulator is replaced.  In addition, multifamily structures should be prioritized over single-family dwellings; OAAR June 10, 2019
H-19-018 Revise ERG for Hydrogen, and Guidance for Incident Management for Fuel Cell Technology; OAAR November 19, 2019
H-19-019 Require requalification inspections for tube trailer special permits; OAA November 19, 2019
H-19-020 Require inspections of cylinder PRD pressure ratings, and inspection and testing of PRD venting equipment; OAA November 19, 2019
H-19-021 Develop guidance with CGA for tube trailer PRD vent systems; OAA November 19, 2019
R-20-001 Railcar maximum coupling speeds and impact mass limits; OAR March 24, 2020
R-20-002 Structural integrity inspection of tank cars in high-energy coupling events; OAR March 24, 2020
R-20-003 Identify tank cars sustaining high energy coupling events; OAR March 24, 2020
R-20-004 Monitor tank cars to remove those damaged by high energy coupling from service; OAR March 24, 2020
A-20-031 Low production or prototype lithium-ion batteries ICAO proposal; IRR June 8, 2020
A-20-032 Remove cargo air transport exception for low-production or prototype batteries; IRR June 8, 2020