AMERICAN FORESTRY 



1301 



Creosoted Water Tanks- 

 Home -Made — 



The species and condition of wood specified for the 

 creosoted water tank, shown below, permit employment of 

 the Open Tank Process either at the shops of consumers 

 or at the mills. 



Loblolly pine is available at many isolated mills, 

 which because of their location cannot economically 

 supply lumber treated by pressure process. How- 

 ever, they could equip themselves to creosote by the 

 Open Tank Process — providing they will meet the 

 necessary requirements of seasoning and framing. 



Lumber and timber, as specified, can be purchased 

 from many sources by consumers, manufactured as 

 required and creosoted by the Open Tank Process 

 with Carbosota Creosote Oil, either at the building site 

 or shops. The treating tanks, etc., required for 

 creosoting can be made portable or stationary. 



The Open Tank Process is not recommended as a 

 substitute for the empty-cell pressure processes, where 

 the latter is practical, but as a means of creosoting and 



Knowles Type Creosoted Water Tank erected at Mattoon, III., by the 

 Illinois Central R.R. (Creosoted by Empty-Cell-Rucping Process 

 5 lbs. A.R.E.A. No. 1 Coal-Tar Creosote Oil per cubic foot.) 



making this grade of lumber available for the pur- 

 pose, under conditions where the empty-cell pressure 

 process cannot be employed. 



The Open Tank Process is efficient and compara- 

 tively economical, but requires a refined, coal-tar 

 creosote oil. That means Carbosota Creosote Oil 

 which conforms to U. S. Railroad Administration 

 Specification R-828-A. 



Carbosota is merely a trade-mark which guarantees 

 an absolutely uniform, highly refined, pure, coal-tar 

 creosote oil, physically fit for non-pressure treatments, 

 and chemically of the highest preservative value. 



(Green wood cannot be effectively creosoted by non-pressure proc- 

 esses. It should be air-dry. In regions of moist, warm climate, wood 

 of some species may start to decay before it can be air-dried. Excep- 

 tion should be made in such cases, and treatment modified accordingly.) 



THE salient features of this type of tank, 

 and the several factors that warrant 

 recommending the Open Tank Process, are 

 quoted from an address by C. R. Knowles, 

 Supt. of Water Service, Illinois Central Rail- 

 road, published by the Southern Pine Associa- 

 tion, in a pamphlet entitled "Southern Pine 

 Tanks." 



" The timber used in Loblolly Pine, coming under the 

 general specifications for tank timber except that no 

 restrictions are made as to heart or sap. The timber 

 is air seasoned, and should be permitted to season 

 for three months in favorable weather." 



" A very important feature in the construction of these 

 tanks is that all timber more than i inch in thick- 

 ness is framed before treatment to secure the maxi- 

 mum life from the treated timber. The work of 

 framing the tank before treatment, is given such care- 

 ful attention that it is rarely necessary to bore a hole 

 in the treated timber during the field erection of 

 the tank." 



"In water tanks, however, there is always an inter- 

 mediate condition of moisture in which the wood 

 is dry on the outside and wet on the inside, thus 

 promoting rapid decay." 



" It is difficult to point out any portion of the tank 

 more susceptible to decay than another, although 

 decay in the tops of the staves is more noticeable, 

 and the timber probably decays more quickly here 

 than in any other part of the tank." 



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