Archived Rulemaking: Transportation of Anhydrous Ammonia in Intrastate Commerce

The Materials Transportation Bureau proposes to amend Part 173 of  Title 49 CFR to authorize the use of nonspecification cargo tanks, and of specification cargo tanks with a design pressure of 250 psig, for the transport of anhydrous ammonia m intrastate commerce under certain conditions. This action is necessary because individual states have adopted the Department's Hazardous Materials Regulations which require the use of DOT Specification MC-330 and MC-331 cargo tanks with a design pressure of 265 psig. The intended effect of this action is to allow continued use of nonspecification cargo tanks and specification cargo tanks with a design pressure of 250 psig for the transportation of anhydrous ammonia m intrastate commerce until they are taken out of service and replaced with new tanks that meet DOT requirements.