Conserving energy by safe and environmentally acceptable practices in maintaining and procuring transmission poles: annual report ; August 1981 Public Deposited


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  • ABSTRACT Fumigants. Chioropicrin, Vapam and Vorlex continue to control Internal decay of Douglas-fir poles 11 years after application. Methylisothiocyanate (MIT), which was melted and poured into holes in Douglas-fir poles 3-years ago and goes directly from a solid to a gas in the wood, appears promising In controlling decay fungi. Now encapsulated MIT also appears promising in laboratory tests. Varying quantities of encapsulated MIT will be placed in decaying CCA-treated Douglas-fir poles 90 to 100 feet long and in service near Buffalo, NY. A high percentage of the 81 poles inspected contained decay fungi; 29 contained decay pockets or carpenter ants. Cedar sapwood. Twenty 10-foot long pole sections of well weathered cedar were installed at an OSU test site. Six chemicals, including 10% penta-chlorophenol in diesel oil will be tested for their ability to control sapwood decay. Other chemicals have been selected for laboratory evaluation. Bolt-hole protection. Twenty-eight Douglas-fir poles 18 feet long were Boulton dried In a pentachiorophenol-heavy petroleun solution. Eight bolt holes will be drilled in each pole and the poles will be installed at the OSU test site. Bolt holes will be protected with preservative powders, liquids and preservative-containing washers before installation of the hardware. Detection of Decay. Chemical color tests, a needle scratch (fracture) test and radial compression tests were applied to Douglas-fir cores decayed to weight losses up to 20%. The radial compression test was the most promising for detecting early decay (weight losses up to 10 percent). A small I ii compression testing device for field use has been developed and will be evaluated. Extent of decay. In attempts to quantify the extent of early decay in Douglas-fir and southern pine, small beams and wafers were decayed to weight losses up to 13%. Large reductions in tnoduli of elasticity and rupture occurred at small weight losses. A staining technique was developed that colors undecayed portions of cell walls green and decayed portions orange when viewed by fluorescent microscopy. Neither computer image analysis nor alkali solu-bility were satisfactory measures of early decay. Decay of Douglas-fir Poles Prior to Pressure Treatment. Fourteen 6-inch long cores were removed from about 100 poles at each of 13 air seasoning yards and the cores were cultured for fungi. Included were unpeeled poles, freshly peeled poles and poles in various stages of airseasoning. Cultures are being examined microscopically for Basidiomycetes which are being isolated, identified, and their ability to decay wood is being studied. Research is in progress to deterine how fungi are spread (soil or air) and how infection of poles occurs. To determine how and when poles are infected and to follow decay development, pole sections were placed upright or horizontally at four air seasoning yards from northern Washington to northern California. Sections will be removed or replaced periodically during the next 3 years, and the sections will be extensively sampled by removing cores to determine the presence of decay fungi. A 32% water solution of ammonium bifluoride was applied to some horizontal sections in an attempt to prevent or slow infection of poles.
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