My only personal experience working with unions was in a pulp mill, in a 
different century. There’s no such thing as hidden piping in a pulp mill.

Do they sometimes leak as they get looser as they warm and cool?

Best.

Bruce Verhei 

> On Feb 13, 2018, at 21:43, Douglas Hicks <fire...@eoni.com> wrote:
> 
> I don’t know about water, but gas piping is not allowed to have unions hidden 
> in a wall. 
>  
> From: Matt Grise
> Sent: Tuesday, February 13, 2018 8:16 AM
> To: sprinklerforum@lists.firesprinkler.org
> Subject: RE: threaded union fitting - follow up
>  
> Just to follow up with this – after reviewing with the code inspector, it was 
> the plumbing code requirement they were thinking of – not applicable to 
> sprinklers. (I know you all have been on pins and needles!)
>  
> Matt
>  
>  
> From: Matt Grise 
> Sent: Thursday, February 08, 2018 1:33 PM
> To: 'sprinklerforum@lists.firesprinkler.org' 
> <sprinklerforum@lists.firesprinkler.org>
> Subject: threaded union fitting
>  
> I recently had an inspector say that all threaded union fittings must be 
> accessible (access panel provided for union behind sheet rock). I have hear 
> that this is a requirement for domestic water piping, but I have never heard 
> about this for fire sprinklers. Does this ring a bell with anyone?
>  
> Thanks!
>  
> Matt
>  
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