Thermoplastic pipes do not have to be contimuously supported unless the
temperature of operation or ambient temperature is high. It is common practice
to lay small bore plastic pipes on cable ladder to provide mechanical
protection. After all the thermoplastics are great for chemical dosing lines.
I have been involved in projects when ABS is run in diameters of DN800. Its quite common in SE Asia for water and waste water, mineral processing plants, power etc.
The difficulty of designing thermoplastics is that the coefficient of thermal expansion is much higher than legacy materials. The modulus is however lower and thus forces arising are relatively lower. Its really a nuisance but it has to be accounted for.
The mechanical strength is lower nad hence the frequency of supports rises.
Waterhammer potential reduces as the modulus is much less hence celerity is reduced thus pressure transients are lower.
You might invest in books suchas :-<a href="http://www.chipsbooks.com/plasticpi.htm">http://www.chipsbooks.com/plasticpi.htm</a>
for cpvc/pvc pipes,pipe is supported through its routing.a channel will be provided below the pipe for entire routing.please correct me,if i am wrong.
take care
kumaresan m p
"RAKESH
PATIL" To: <Mechproj@xtra.co.nz>,
<rpa@epc.ltin <PipingDesign@yahoogroups.com>
dia.com> cc:
Subject: [PipingDesign] Supporting
03/21/03 Arrangement - GRE / CPVC
08:22 PM
Please
respond to
PipingDesign
Hi All,
I am interested in knowing the basis for designing the Support Arrangement for GRE as well as CPVC / PVC Piping. It is required in our ongoing offshore project.
Kindly guide me.
regards,
rakesh
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