[labnetwork] joining long PVDF pipe runs

[John Shott]

Iulian:

Our PVDF system is predominantly welded with occasional unions where 
needed.  The original part of our system was installed sufficiently long 
ago, that I believe the only choice at that time was the Georg Fischer 
socket fused connections.  Since that time we have had a few segments 
added ... a bit as recently as a couple of months ago.  For that we have 
used the butt-welded fusion fittings (rather than socket fused joints) 
... with occasional butt-welded unions where required for easy assembly 
and/or disassembly.

I hope that helps and, as usual, I will be looking to see what other 
folks have done.

Good luck,

John


On 7/5/2012 5:33 AM, Iulian Codreanu wrote:
> Good Morning.
>
> We are trying to determine how to best join long runs of PVDF pipe on 
> our ultrapure water system (we are trying to achieve Type E-1.1 per 
> ASTM D5127).  We are aware of the following methods:
> - fully welded system
> - systems using flanges
> - systems using unions
> - systems using GF sanitary couplings with clamps
>
> Knowing how other University Fabs do it would be very helpful in 
> making a decision (affecting water quality, cost, and schedule) and 
> thus your input will be much appreciated.
>
> Iulian