Impact of 200 ppm HiTEC (registered trademark) 4898C Lubricity Improver Additive (LIA) on F-76 Fuel Coalescence.

摘要

As the Navy transitions to the use of low-sulfur diesel fuels, the inherent lubricity of F-76 will decrease due to the removal of sulfur containing compounds known to have good natural lubricity. As specified in MIL-DTL-16884N, F-76 must produce a wear scar diameter less than 460 micrometer when tested in accordance with (IAW) ASTM D6079 or ASTM D7688. In order to meet this requirement the addition of lubricity improver additives (LIA) may be necessary. Prior to approving a LIA for use in F-76, the LIA must show no detrimental effects on fuel properties. HiTEC(registered trademark) 4898C is a synthetic neutral LIA produced by Afton Chemical Corporation. HiTEC(registered trademark) 4898C was designed for use in low sulfur diesel fuels and as such considered a viable F-76 LIA option. However, F-76 containing 200 parts per million by volume (ppm) HiTEC(registered trademark) 4898C displayed a poor ability to separate from water when tested IAW ASTM D1401 and ASTM D7261. To further examine the effects of 200 ppm HiTEC(registered trademark) 4898C on water separability, a Navy Coalescence Test (NCT) was completed. After 80 hours of testing it was concluded that F-76 containing 200 ppm HiTEC(registered trademark) 4898C meets the acceptable performance criteria. However, due to the fuel's poor demulsification results a risk assessment is needed prior to approving the use of HiTEC(registered trademark) 4898C at a concentration of 200 ppm.