A Course In the Design of ABS Piping Our Objectives Presented by Geoffrey D Stone FIMechE C.Eng http://waterhammer.hopout.com.au/ Provide an insight into what piping designers need & expect Define the role of the supplier & designer Learn some fundamentals of piping design Discover failure analysis techniques Share experiences of problems A Course In the Design of ABS Piping What We Shall Look at This Week ABS Material Properties Thermoplastic Pipe Design Waterhammer Analysis Typical Applications of ABS Pressure Pipe Some Anticipated Events Stages of the Design Process Representation-Drawings & Specification Calculation-Engineering & Assumptions Visualisation-Presentation of Information Validation-Testing & Commissioning Role of the ABS Pipe Supplier What the Customer Expects Avoid the following: Material Properties Accept design risk for a sale Design Criteria Accept MTO risk
Fifth level Click to edit Master text styles Second level Third level Fourth level Fifth level Polytetrefluoroethylene Properities Thermoplastic polymer Hydrophobic Non-stick White solid Melting point - 327 °C Chemical resistance Inert Polytetrefluoroethylene Applications Electrical and electronic industry Metal finishing, paints and coatings Optical devices Automotive uses Cabling materials Food indusrty Polytetrefluoroethylene Safety PTFE is not dangerous in low-temperatures While PTFE is stable and nontoxic, it begins to deteriorate after the
appearance rather than redesigning the entire body/chassis of the car). Again, this word is mostly used by the auto trade and automotive journalists. Furthermore, the fascia is used to describe the single panel that conceals the bumper, front or rear, and ties the bumper element visually with the sides of the vehicle--often including an inlet for cooling. 93% [citation needed] of fascias are made of TPO (thermoplastic olefin elastomer). This material is high gloss, has thin wall capability, improved paintability, and a low coefficient of thermal expansion. · Fender (wing or mudguard): A curved piece of metal or plastic above the wheels of a bicycle, motorcycle or car that prevents dirt from getting on the rider. (kere tiib, porikaitse, poritiib) Fender is the American English term for the part of an automobile, motorcycle or
-CH -O - CH- CH3 - OH HO - CH3 H+ OHtekivad alkoholi molekulid Amorfsed polümeerid lagunevad paremini, kui kristalliinsed: tärklis, PVA (polüvinüülalkohol), PEG, tselluloosi derivaadid, polüestrid. Keskonna saaste seisukohalt peaks tarbeplastid olema ajas kergesti ja kiiresti lagunevad. Polümeerid, mis sisaldavad - C = O rühmi lagunevad hüdrolüüsi, bio-ja fotodegradatsiooni teel. Tärklise lisamine kiirendab/ hõlbustab teiste polümeeride degradatsiooni. - termoplastne tärklis / thermoplastic starch: biolagunev materjal, mida segatakse (blend)ka teiste plastidega nende biolagunemise soodustamiseks ( tärklist 60-70%). Polümeeri eluiga: seda reguleerib polümeeri struktuur V kiirus ( aeg) kasutusaeg t Kasutusaja pikendamiseks lisatakse polümeeridele aineid, mis aeglustavad vananemist- inhibiitorid - vananemisel muutub polümeeride lahustuvus - polümeer võib muutuda nõrgemaks ja hakata " voolama" ( leepuvad, jäävad alus- materjalide külge jms )
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