General
Cylinder Manufacturers
OverviewA person who seeks to manufacture DOT specification or special permit cylinders outside the United States must seek an approval from the Associate Administrator to perform the chemical analyses and tests of those cylinders in accordance with 49 CFR Section 107.807.
Current...Designated Approval Agencies
Document updated to reflect what each approval holder is qualified to inspect (new manufacture or periodic inspections).Annual Report Mileage Summary Statistics
Hazardous Liquid
Gas Distribution
Gas Transmission & Gathering
Liquified Natural Gas (LNG) Facilities
-->Liquefied Natural Gas (LNG) Facilities and Total Storage Capacities
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Annual Report Mileage for Natural Gas Transmission & Gathering Systems
th { white-space: normal; } .table th, .table td { padding-left: 2px; May 1, 2026 Hazardous Liquid | Gas Distribution | Gas Transmission Gathering | Liquefied Natural Gas Annual Report Mileage for Natural Gas Transmission & Gathering SystemsYEARNUMBEROFRECORDSPIPETOTALON-...Independent Inspection Agencies Information
INDEPENDENT INSPECTION AGENCY (IIA)
49 CFR 107.803
Applicants seeking approval to requalify, repair, rebuild, reheat or manufacture DOT or UN ISO Cylinders in accordance with the 49 CFR must have an Independent Inspection Agency inspect their...
Independent Inspection Agencies - International
Independent Inspection Agencies - International