Railworthiness Directive for Railroad Tank Cars Equipped With Certain McKenzie Valve & Machining LLC Valves

Recent FRA investigations identified several railroad tank cars transporting hazardous materials and leaking small quantities of product from the cars' liquid lines. FRA's investigation revealed that the liquid lines of the leaking tank cars were equipped with a certain type of 3<gr-thn-eq> ball valve marketed and sold by McKenzie Valve and Machining (McKenzie) (formerly McKenzie Valve & Machining Company), an affiliate company of Union Tank Car Company (UTLX). FRA further found certain closure plugs installed on the 3<gr-thn-eq> valves cause mechanical damage to the valves, which leads to the destruction of the valves' seal integrity and that the 3<gr-thn-eq> valves, as well as similarly-designed 1<gr-thn-eq> and 2<gr-thn-eq> valves provided by this manufacturer are not approved for use on tank cars. FRA is issuing this Railworthiness Directive (Directive) to all owners of tank cars used to transport hazardous materials within the United States to ensure they identify and appropriately remove and replace these valves with approved valves consistent with Federal regulations.