بررسي دوام چوب هاي خارجي مورد مصرف در ساخت شناورهاي چوبي در مقابل عوامل مخرب دريايي در سواحل استان سيستان و بلوچستان

Investigation on durability of exotic wood species used in wooden vessel fabrication against marine borers in Omman Sea Coast

The importance of maintenance of naval construction and their intensity of destruction have taken our attention to carry out a research project on this connection. The aim of this research shoud be described as follows: 1 - Study on natural durability of the exotic wood species (Teak, Keruing, Balau, Chengal) against marine borers. 2- Study on the effect of treatment on increasing of durability of those species. Among those species, some sampling have been choosen using C.R.S. Method. Samples, were treated (impregnated) by coal tar oil (Creosot) in Gazvin impregnation plan. The treated samplings were compared with control samples of exotic wood, also beech and oak (Iranian wood species) which have been installed in sea water according to IRG/WP. During 6, 9, 19, 21, 27 months, the samplings were inspected according with recommandation of IRG/WP. During this instalation period, all the control samplings (no treated), expect chengal, have been seriously attacked by marine borers. All the treated samplings, after 20 months instalation in sea water, were completely safe.