[labnetwork] joining long PVDF pipe runs

[Morrison, Richard H., Jr.]

Hi,

We are just finishing construction on a new cleanroom here at Draper. Our DI water piping is natural polypropylene, IR fusion welded with butt joints. We felt that this could provide us a DI system that meets the semiconductor standard. The pipe supplier is Asahi/America. The pipe is weld in an on-site cleanroom then the pieces are assembled in the air on overhead racks resting in a pipe trough. To make assembly a little easier the pipe sections are joined by clamps.

This was done to keep assembly cost reasonable and purity sufficient for our operation.

Hopes this helps.

Rick


Rick Morrison
Senior Member Technical  Staff 
Group Leader Microfabrication Operations
Draper Laboratory
555 Technology Square
Cambridge, MA  02139

W  617-258-3420
C   508-930-3461



-----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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