404 BuLiJ-TiN 92 



In the abnve pmccss, the crude dI! is first separated into five parts. 

 As heat is a]-)pHcd, the crude naphtlia is distilled first. Wlicti the grav- 

 it\- of the distillate i.s down to 4A- D.. the vahes in the piping are 

 changetl and the distillate is run into the crude kerosene stock tank. 

 When the gravity is down to 3>7° W., the distillate is ''cut" to tanks 

 holding heavy gas oil. (This is not the ga.s oil ,or tops, that is familiar 

 to pump irrigators throughout Arizona.) The crude naphtha i.s refined 

 again, yielding gasoline, and a residue which is piped to the kerosene 

 stock tanks. The kerosene stock is distilled again, yielding a distillate 

 which is treated with acid and becomes kerosene, and a residue which 

 is piped to the heav}- gas oil tanks. 



It is the crude kerosene stock wdiich approximates California tops 

 in quality. 



TWKNTV-SKVEN PLUS OIL 



Considcralile California oil of a grade called ''27-plus" has been 

 brought into Arizona for use in semi-diesel engines. One sample of 

 27-plus found at Phoenix tested 32° B. The largest refiners, however, 

 have ceased to make this oil, and it is found to be an excellent oil for 

 crackino'. Also, the semi-diesel engines have not become popular on 

 account of their higher cost, their unsuitability for farm conditions. 

 and their need of close attention. Therefore, 27-plus is not an oil of 

 importance. Its present price f.o.b. Tucson is 15 cents per gallon. It 

 appears possible that a large supply of cheap gas oil of about 34° B. 

 is to be available in the North Texas field. This oil is approximately 

 equivalent to 27-plus from California. If it is probable that such a 

 supply will be available for many years, it will tend to increase the 

 use of semi-diesel engines, in which case those engines having com- 

 pression pressures of about 250 i)ounds per square inch should be 

 preferred to the ordinary semi-diesel engines having compression pres- 

 sures less than 200 pounds. 



24 BAUMIv OIL 



Oil of 24° B. was formerly sold under the trade name of Star 

 Fuel Oil ; it is now called Calol diesel engine oil. at least by one com- 

 pany. It is the ideal oil for engines of the diesel and Hvid, or Brons. 

 types, with the exce]ition of small Bmns engines, less than 20 horse- 

 power, for which c^as oil is used. \\'hilc such engines can burn heavier 

 oil for short periods of time, it is wiser to u.se 24° oil for steady opera- 

 Footnote — A.s this V.uUctin koi's to press, tli.ri- is iiicrc.isiris cvidoiife lli.il Arizona will have 

 to look to Tcxns for fuel oils for Ui,. foiiiiiiLr .v..,ir. Priros of pctrolouin oils in 'IVxas liMve bocn 

 uriMUy rcdurr.l. wliilc in Ciliforni:! iUrrr Iins lii-cn no .l.vriMso in prims. 



