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MRY 04 2005 7: 24AM SM LASFRJFT 3200 p• 2 3. 2005 iBE?GLASS 10, 2l7E P. 213 SECTION 5. OTHER GONS424"T , 1, VIERATLON L. ULTRAVIOLET(U,v,)RAD1AT ION AND WEATHERING Low ernpGtude vibrations sucks as those produced by well- have e undergoes Clsagges in appearassce when anchored Ceotrifigel pumps will have little effEcr on Smith fiberglass p,p g Fibercast piping, Such vibrations will he dampened and exposed Vt T db on ot;bis is sin ar degradation e sed absorbed by the relatively low modulus pigs. However, Y g care must be taken to Protect the exterior of the pipe from pends upon the ace�atctl rodegre and mn may a of surfaces thot mlght abrade and wear through the,piG W y�r�'f R period of tune. This can be a:ovmpli=ked by the outer layer of glass fibers,this•cottdition is called over a long p e at the first cd or "fiber-blooming°. These exposed glass fibers wi',1 block applying protective sleeves to the pip three supports or padding these supports with%/8-inch and reflect a significant portion of ulaaviokt radiation re ribber gasket material. salting in a slower rate of degradation. This tniriirnitP.s fir lure damage to the remaining pipe wall. Because Snaith Ebel►amplitude vibzation from pumps or other equipment Fiberrast pipe bodies are designed with significant$afety must be isolated from the piping syrtcm by'flcxi"6le can- factors,rninar fiberblaoming does not prevent the pip fromsafely performing at its published pressure rating If nectars. scMre conditions are such that exposed fibers will be abraded wltb alae,it is highly recommended that surface TL MID HAMMER be protected. Peitating the pipe with a [sod quality acrylic A,moving column of fluid has tnomeutum proPortional to or solvent-base paint is use m oc ra ra iataon its mass and velocity.When flow is abruptly stopped,the AND RODENT turn is converted into an impaise:er high- -,4.FUNGAL,RESISTANcE T$R7AL,, pressure surge. The higher the liquid velocity and longer t-►e pipe line,the larger the impulse. 4 ^, #�ysvb�,erlt, 15ra1,bec- These impulse loads can be of sufficient magni- teriel,and/or rodent attack,but fiberglass pipe offers po rude to ipulsec pipe,fittings and valves- nourishment or attraction to these annoyances, Under r stagnant conditions,some marine growths will attach to fiberglass sorfacea,but they do not attack or bore into the t Accurate determination.of impulse loads is very eornplex i e-ayd are usually easily removed,Note regarding ze- . and typically requires computer measling of the piping pipe m mussels: It was recently reported that a utility COM- system. However,the Talbot equation,given inaced iebra mussel growth in similar mesal and fiberglass Appendbti:A,may be used to calculate thcoraticalinn- nta4c lines at the same location. Only two liters of zebra Pulses assuming an Instantaneous change in velocity. Although,it is plays ically impossible to close a y2lve in- mussels war mo"e fiberglass ilSW_Japeeaclwo stautaneously,Talbot's equation is often e 'er ... . p m line, culate worst cast conditions. in the real world quic!c reacting valves,reverse flaw into check valves and sudden variations in pump flow rat's will cause water hammer surges. Engineers tyPleelly io- corpo}Ate slow operating valves,surge tants and soft- starting pumps into piping systems to minimize fluid hammer, piping systems that experience surgeconditions should be restrained to prevent excessive movement- If the system operating pressure plus the peak surge pros- sureexceeds the system pressure rating,then a higher pressure lass piping system should he employed, WA �I glr, �tlnq & Piping 1 -�,s+4gn wide 23