Accession Number : AD0732467

Title :   Investigation of Fuel Pump Failures with Navy Distillate Fuel.

Descriptive Note : Final rept. 24 Jun-20 Oct 71,

Corporate Author : MECHANICAL TECHNOLOGY INC LATHAM N Y

Personal Author(s) : Wilson,Donald S. ; Arwas,Elie B. ; Murray,Sylvester F. ; Gu,Alston L.

Report Date : 01 NOV 1971

Pagination or Media Count : 120

Abstract : A study was made of the probable cause or causes of the fuel pump failures that have been encountered in some Naval ships since conversion to navy distillate (ND) fuel. The study concentrated on the pumps of the USS Constellation, since this ship has suffered a very high rate of fuel pump failures. Analysis of the heavy load region of the idler bore showed that the film thicknesses in this region are very small with ND, in the range of 50 to 110 microinches. This analysis and the inspection of failed pumps showed that ultimate failures resulted from rupture of this film and subsequent high wear of the idler bores. Heavy contamination of the fuel with hard particles was at least a contributing factor in the failures. The processes whereby the various types of contamination (by solid particles, water, entrained gas, and ND-NSFO emulsions) can induce or contribute to pump failures is discussed. Materials for improved tolerance of the operating conditions are also discussed. Recommendations aimed at preventing future pump failures are provided. These include a run-in procedure necessary to burnish the surfaces in the idler bore region so that they can sustain a full, separating fluid film. Desirable revisions in start-up and operating procedures are identified. The need to reduce contamination level is stressed, however, acceptable levels should be experimentally established. (Author)

Descriptors :   (*FUEL PUMPS, NAVAL VESSELS(COMBATANT)), NAVAL VESSELS(SUPPORT), FUEL OIL, FAILURE(MECHANICS), ROTARY PUMPS, LUBRICATION

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE