114 



PENETRATION 



Piling shall be accepted upon the showing of penetration of creosote oil in each 

 pile. This penetration must be based on black or very dark oil and in no case will 

 a light discoloration of the wood due to treatment be taken into consideration in 

 measuring the depth of penetration upon which the piling is to be accepted. 



The test for penetration shall be made by boring the piling midway between 

 ends with either an increment borer, or a five-eighths (^g) inch auger, the choice of 

 which shall be optional with the inspector. Each hole so bored 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 ever%' pile in the charge for penetration 

 and at least six (6) of these piles must be bored from two different angles in order that 

 he may satisfy himself that the piling has the minimum specified penetration on 

 all sides. 



The minimum depth of penetration with specified amoimts of creosote oil 

 shall be as follows ; 



12 pounds of oil per cubic foot — ^4^" penetration. 

 14 pounds of oil per cubic foot — ^g" penetration. 

 16 pounds of oil per cubic foot — 1 " penetration. 



The curves shown on fig. 43 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 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 seasoned or thoroughly air seasoned 

 material for the same cylinder charge. In loading sawed lumber and timber on 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 tempera- 

 tures will be 180° F. and 190° F. respectively. This temperature shall be maintained 

 constantly under a vacuum of at least twenty (20) inches mercury during the period 

 of artificial seasoning, until such time as the water accumulating in the hot well of 

 the condenser does not exceed one-tenth (1 10) of a pound of water per cubic foot of 

 timber in charge, per hour. 



Treatment of Air Seasoned Sawed Material 



This material, as in the case of green or freshly sawed lumber and timber, shall be 

 treated separately and in no case shall it be mixed with and treated in the same cylinder 

 charge with other material of different moisture content. In this case the period of 

 artificial seasoning may be dispensed with, but the material may be held in hot oil 

 at a temperature of 180° F. to 190° F. until it is heated sufficiently to permit proper 

 treatment. This having been accomplished, pressure may be applied until the required 

 absorption has been reached. 



