[labnetwork] joining long PVDF pipe runs

[Schweiger, Dennis]

Iulian,

Our new system here is fully fused, butt joints.  All of the cleanroom is PVDF, supply and return.  In the mechanical spaces (primarily the subfab area), the return side is butt fused poly-propylene.  Wherever we transitioned from PVDF to poly-pro on the return side, we used a gasketed flange connection.  There was quite a bit of cost savings going that route. 

Dennis Schweiger
Facilities Manager

Lurie Nanofabrication Facility
University of Michigan
1301 Beal Ave.
Ann Arbor, MI 48109-2122

734.647.2055 Ofc
877.471.6208 Fax
586.531.3030 Cell

"People can be divided into 3 groups - those that make things happen, those that watch things happen, and those that wonder what happened."

-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Iulian Codreanu
Sent: Thursday, July 05, 2012 8:34 AM
To: Fab Network
Subject: [labnetwork] joining long PVDF pipe runs

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
--
iulian Codreanu, Ph.D.
Director, Penn NanoFab
200 South 33rd Street
Room 376 GRW Bldg
Philadelphia, PA 19104-6314
P: 215-898-9308
F: 215-573-2068
www.seas.upenn.edu/~nanofab


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