[Greenbuilding] Please remove me from the list.

[Poppy Behrens]

  Poppy Behrens 
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________________________________

From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of
John Straube
Sent: Saturday, December 31, 2011 10:48 AM
To: Nick Pyner
Cc: 'Green Building'
Subject: Re: [Greenbuilding] Legionaires disease and water temperature

 

Who on this list is casually dismissing the codes (no one I heard)? And
how many on the list dont have the codes you have in your region (e.g.,
most)?

We were discussing what the actual risks were, and you dismissed
(casually or not I cant say) the factual scientific information because,
as far as I can tell, it was not the same as what your code tells you to
do. In short, you did not seem to like the results of the "homework"
that others were presenting.

Mike O'Brien's list is supported by experience and pretty solid research
going back decades.  

Based on the information in the discussion, someone in the US, where
codes dont require 60C (140 F) and 45/50 supply (most of the US), could
now make an informed choice about setting their electric storage tank to
60C (to control Legionnaires) and use a tempering valve to reduce supply
temp to 48C (120F) to reduce scalding risk.  Even though the code does
not require it.

And some of the professionals on the list could now assemble the
information to support setting the hotwater temperature in their
instantaneous or storage gas heater to 50C in code jurisdictions where
there are rules of 60C.  Seems like you already have that in your code
for instantaneous gas, we do not have that in Ontario.

And then of course you need to give some thought to the distribution
system. As we move from copper to PEX for supply water, the risk caused
by stagnant water clearly goes up, but I have not seen the studies to
quantify this.  There are lots of good practice things to do that can
manage this risk well however.  

Dr John Straube, P.Eng.
www.BuildingScience.com


On 11-12-30 11:29 PM, Nick Pyner wrote:
> Indeed. And like I said - if

      you have codes, that is where you look



      > first. I didn't say anything about following rules blindly,

      I'm



      > currently in the business of trying to change them, but

      casually



      > dismissing them is not usually a good idea, particulalrly in

      this



      > arena.



      > 



      > Nick Pyner



      > 



      > Dee Why NSW



      > 



      > -----Original Message----- From: John Salmen



      > [mailto:terrain at shaw.ca]



      > 



      > Funny comment to make.



      > 



      > If you do something different (aka not follow the rules

      blindly) then



      > in terms of community and pushing the boundaries you do need

      to do



      > the homework



      > 



      > 

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