[Greenbuilding] [BULK] Re: [BULK] Sprinklers-and PEX

[Keith Winston]

I would disagree that collector components would be damaged, most 
collectors can withstand stagnation and get quite hot in that situation.

However, I did fail to mention in an earlier post: I was not considering 
the possibility of an open-system install (where your house water 
pressure was running through your collectors, maybe 60 psi instead of 12 
psi or so). As John mentioned, pipes are rated for both pressure and 
temperature. On solar systems, one has to install lower pressure relief 
valves (typically set at 30 psi) instead of those on a standard water 
heater that might be at 150 psi.

Warmly, Keith


Sacie Lambertson wrote:
> Hmm. when the components of a collector are made of copper I can't see these
> melting  before the PEX to which they are attached.  Don't know the rating
> on PEX of course.  Higher or lower than thinwall (PVC)?  Sacie
>
> On 9/14/07, John Salmen <terrain at shaw.ca> wrote:
>   
>> Temp ratings on pipe are a combination of temperature and pressure.
>> Standard
>> thinwall is around 120d @ 100 psi though most pipe is rated higher.
>> Pressure
>> relief and vented collectors are typically used in systems. A system
>> shutdown will more likely meltdown collector components before damaging
>> pipe.
>>
>>
>>
>>
>>     
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