The table below is a summary of the NTSB recommendations regarding highway and the OHMS responses. For copies of the specific letters in WordPerfect (.wpd) or PDF format containing the NTSB/OHMS dialog, click on the link under "Latest PHMSA Response" or "Notes."
OAR - Open Acceptable Response
OAA - Open Acceptable Action
OAAR - Open Acceptable Alternative Action
OUA - Open Unacceptable Action
OUR - Open Unacceptable Response
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Require periodic nondestructive testing to be conducted on nurse tanks to identify material
flaws that could develop and grow during a tank's service and result in a tank failure.
Modify 49 Code of Federal Regulations 173.301 to clearly require that valves,
piping, and fittings for cylinders that are horizontally mounted and used to
transport hazardous materials are protected from multidirectional forces that
are likely to occur during accidents, including rollovers.
PHMSA, in cooperation with FMCSA, and industry are reviewing the requirements of this recommendation
Require that cylinders that transport hazardous materials and are horizontally mounted on a semitrailer be protected from impact with the roadway or terrain to reduce the likelihood of their being fractured and ejected during a rollover accident.
PHMSA, in cooperation with FMCSA, and industry are reviewing the requirements of this recommendation
Prohibit the carrying of hazardous materials in external piping of cargo tanks, such as loading lines that may be vulnerable to failure in an accident.
Provide cargo tank manufacturers specific written guidance about (a) the factors and assumptions that must be
considered when calculating the loads on cargo tank rollover protection devices in determining compliance with existing DOT
performance standards; and (b) acceptable means to shield and protect the top-mounted closure fittings on all bulk liquid cargo
tanks.
PHMSA in cooperation with FMCSA is working with TTMA to address the requirements of this recommendation.
