Longitudinal Flow of Liquids in Southern Pine Poles

Rates of flow of several 1.5 percent water-soluble preservatives in southern pine poles was investigated by using an end-cap fitted to the butt end of the pole and sealed so that the preservatives could be forced longitudinally through the pole under high pressure. Green southern pine poles were treated by cutting a 1- to 2-inch disk from the butt-end, fitting the end-cap in place, and forcing the preservative into the pole at various butt pressures. After several runs a second disk was removed following initial application of pressure and the pressure was reapplied. Flow rate and pressure data showed that the rates obtained after cutting of the first disk were 20 to 30 times greater than the rates normally obtained in the Boucherie process. Reapplication of pressure after cutting the second disk, however, resulted in rates as high as 400 times that obtained in the Boucherie process. Factors of flow rate, pressure drop along the pole, treating time between felling and treating, and preservative distribution were investigated.

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