[labnetwork] joining long PVDF pipe runs

[Robert M. Hamilton]

Iulian Codreanu,

The DI water guidelines available at Balazs Analytical 
Services are worth a read:
http://www.balazs.com/file/otherelement/pj/2_upw_guidelines_rev2.34758.pdf

Since cost/benefit it critical for most university lab 
construction it is worth considering point-of-use 
purification when or if a hypercritical need arises (such as 
ultra-low oxygen content) instead of trying to bring the 
whole delivery system up to an exotic spec.

A more direct answer to your query: the UC Berkeley NanoLab 
uses fusion-welded PVDF. Its predecessor, the Microlab, used 
glued PVC piping without issue. The Microlab regularly 
received compliments about extraordinarily high quality of 
the silicon oxide it was capable of producing.

Bob Hamilton

Robert M. Hamilton Marvel NanoLab
University of CA at Berkeley
Rm 520 Sutardja Dai Hall Berkeley,
CA 94720-1754
bob at eecs.berkeley.edu (e-mail preferred)
510-809-8600
510-325-7557 (mobile/emergencies)


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