1 1 1 



5. The distillate, based on water-free oil, shall be within the following limits 

 (test to be made at, or corrected to atmospheric pressure at sea le\el) : 



Up to 210° C. not more than 5%. 



Up to 235° C. not more than 25%. 



Up to 315° C. not less than 45%, nor more than 75%. 



Up to 355° C. not less than 70% nor more than 90%,. 



6. The residue above 355° C. shall have a float-test of not more than 50 seconds 

 at 70° C. 



7. The oil shall yield not more than 2% coke residue. 



8. The foregoing tests shall be made in accordance with the staiulard methods 

 of the American Railway Engineering Association. 



TREATMENT AND INSPECTION 

 Treatment shall be by the Boulton process (boiling under \acuum). 



Treatment of Green or Freshly Cut, Water Stored and 

 Partially Air Seasoned Piling 



PERIOD OF artificial SEASONING 



After the piling is placed in the treating cylinder, it shall be immersed in creosote 

 oil and kept covered during the entire boiling period of the process, the oil level 

 being at least four (4) inches above the topmost pile. 



After filling the treating cylinder with creosote oil as above specified, connections 

 between condenser and vapor drum on treating cylinder shall be opened, steam shall 

 then be admitted through the heating coils and shall be so regulated that the tempera- 

 ture inside the treating cylinder is kept rising as fast as the condensation will permit, 

 until a temperature of 215" F. is reached. Ha\ing reached this temperature, a vacuum 

 of at least twenty (20) inches of mercury shall be produced and maintained in the 

 treating cylinder, the escaping vapors being drawn into the condenser. This operation 

 shall be continued until such time as the amount of condensation collected in the hot 

 well of the condenser does not exceed one-tenth (0.1) of a pound of water per cubic 

 foot of timber in charge per hour, at a temperature not to exceed 220° F. inside the 

 treating cylinder. This temperature shall be regarded as the absolute maximum to 

 be allowed. 



PRESSURE PERIOD 



After the period of artificial seasoning has been completed, as specified in the 

 foregoing, the temperature inside the treating cylinder shall l)e allowed to drop to 

 approximately 200° F. The treating cylinder shall then be completely filled with hot 

 creosote oil (temperature about 170° F.) from the operating tank, after which all 

 vents shall be closed and more oil pumped or forced into the treating cylinder from 

 the operating tank until the pressure gauge on the treating cylinder records a five (5) 

 pound pressure (this to insure that the cylinder is full). Creosote oil from a measuring 

 tank shall then he forced into the cylinder at a pressure not to exceed 175 pounds 

 per square inch. This operation shall be continued until such time as the piling has 

 absorbed sufficient oil to insure the final retention of the amount specified after the 

 treating cylinder has been drained. This having been accomplished, the piling may 

 be removed from the treating cylinder as soon as the temperature within the cylinder 

 has dropped below 200° F. The application of a final vacuum for a period not to exceed 

 one hour will be allowed to reco\er drip. 



