66 



shall be plugged with a tight-fitting creosoted plug furnished by the 

 creosoting company. Should the inspector, upon boring the piling, find 

 that the borings contain free moisture, he shall reject any such piling 

 and have same retreated under the conditions hereinbefore specified. 

 The inspector must in all cases bore every pile in the charge for pene- 

 tration and at least six (6) of these piles must be bored from two differ- 

 ent angles in order that he may satisfy himself that the piling have the 

 minimum specified penetration on all sides. 



The minimum depth of penetration with specified amounts of creo- 

 sote oil shall be as follows: 



12# of oil per cubic foot %" penetration. 



14# of oil per cubic foot 1" penetration. 



16# of oil per cubic foot 1 *4 " penetration. 



The curves shown on Diagram I are given for information and show 

 the theoretical relationship between the amount of creosote oil injected 

 per cubic foot and the average depth of penetration in inches. 



Treatment of Air Seasoned Piling 



In the treatment of air seasoned piling, where artificial seasoning 

 is unncessary, the piling shall be held in the hot oil under the same 

 conditions as specified for green and water stored piling, until such 

 time as it has been heated sufficiently to permit impregnation without 

 the use of excessive pressures- This having been accomplished, the 

 specified amount of creosote oil may then be injected as in the fore- 

 going case of green or water stored piling, and upon being removed 

 from treating cylinder, under similar conditions, this piling shall stand 

 the same detailed inspection. 



When air seasoned piling is found to be case hardened, preliminary 

 steaming will be allowed for a period not exceeding four (4) hours at 

 a pressure of not to exceed twenty (20) pounds. 



Green or Freshly Sawed Lumber and Timber 



As hereinbefore specified, this material must be treated separately 

 and must not, under any circumstances, be loaded with partially sea- 

 soned or thoroughly air seasoned material for the same cylinder 

 charge. In loading sawed lumber and timber into cylinder tram cars 

 for treatment, stickers or separators must be placed between all the 

 layers as the material is placed on the tram car, in order to insure 

 complete access of the creosote oil to all surfaces of the wood. 



The process of treatment shall be identical with that specified for 

 green or water stored piling, with the exception that the minimum and 

 absolute maximum temperatures allowed will be 180 F. and 190 F. 

 respectively. This temperature shall be maintained constantly under 



