This item is being balloted in response to concerns raised during recent balloting of the specification for dimethyl ether (DME), D7901. Recent technical papers have demonstrated that DME has very poor lubricity in a modified, high pressure HFRR test. However, while the OEM and FIEM developing an engine and fuel system specifically for DME are not in a position to document a specific lubricity requirement at this time, they do want to have a statement to the effect that a lubricity additive will likely be required in DME in order to allow DME to be fit for purpose and operate satisfactorily in purpose-built engines. The task force discussed the options of adding a lubricity additive and of developing a fuel pumping and injection system that did not require a lubricity additive to be used. The following proposed statement is being balloted into D7901 to address the lubricity issue.
Keywordsdimethyl ether; DME;
Ballot Item Approved as D7901-2014A and Pending Publication