08-10-1992 Council Packet - Laserfiche WebLink

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mkit' fi*.- P e. ’ i:^ vr: ,r--' fe--p:< 'i--- •n I- fte Efe-. ^:v polystyrene to be coated or encapsulated. Sane requirements nay fjvoWe only the shoreline so it is »tici^ing r«tri^ons on Se of exposed polystyrene will be inposed on all bodies of water wit^ a few years, of the current problems in the C of E coating recrements is thU/the approval of a particular coating is at the ^scretion of ea^ reservoir manager. What nay be approved on one b^y of rater ray approved on the next one. Hopefully a toughness and longevity test for f^ protection will be developed in the near future for use by all specifiers and \]sers jathouoh I have been deeply involved in the design, nanuracrure ^ tol Lsr 25 years, it hjs be® ^ t^ l®t th^ years that I have intensified my research on flotaUon ferial s aM «naseM\ts Water absorption, foam densities, and encasements have ativlied with over 125 samples of foam tested and many encasements matured and is fdiscussi® of so^ of .sy test resu ts flotation dioices vdiioh will help guide the design of flotation in the X990s. wood as a flotation material is the oldest float material^ i^®^‘^i„'“«ter ^“northwest part of this country having a nv® sVwBAt-B«<ian decay and being eaten by various marine organisms. If its lx*.e spanks cotpatible with the floating dock design life, then the wood ray mee the p jject requirements. Air is still a good flotation material but is only as good as its ^tal encasonents are at the mercy of good welds ^ by to cenbat corrosion. Both welds and the metal need t ai«o coatings unless the metal is of significant tMctoess. thicknSs and usable encasements for air but must be designed with strength to resist collapse from ice, puncture, debris, or str^ flotation frJniraroDer comer radius and/or materials. Here again, this type f lota tim liTb^dSi^eS ™?aS^?Se Ufe of the floating dock structure with proper aiSlysis of^ter quality and its effect on the encasement material. p«lvurathane continues to be used by a few float manufacturers. This material Si^ pSi^rly Ltmulatrf ®d «p®ded with the use ^“y «Strolled t«*>eratur« so as to have ®ly a However, *d»® poured or injected with honoimde devi^ control, the material will usually have nrnny voi^. Hus type foam ruse always be protected as it will erode away very easily. was that when polyureth®e is <,y with tte repeated freeze polyurethane turns to slush ^ 1^® all <-3„%et into the and thaw cycles. This material should not oe usea it -Oe- i