I have used a stainless ferrule on the Kel--F tubes. I felt that teflon on Kel-F would not make for a very good seal. It the seal slippled the Kel-F tube could slip out of hte fitting. The stainless ferrule seem to bite into the kel-f and hold it well Andrew Campbell At 03:02 PM 10/16/97 -0500, you wrote: >Carolyn and others, > > Having used lines built by others, but never having built one >myself, I need to take advantage of your experience... > > For the Kel-F vessels, are you using stainless steel or teflon >ferulles [sp?] with the swagelok fittings? Thanks to all for the >information on wall thickness/internal diameter. Obviously a sturdy wall >is needed. > > In general, what type of ferulle is recommended with metal-to-metal >swagelok connections--teflon or steel? > >****************************************************************** > >>Steve, >>Our Kel-F tubes have been drilled to 5/8 internal >>diameter, i.e. 3/16 wall thickness. We are using >>Swage-lok fittings, and it is important to have a good >>wall thickness. >>Good luck with your line >>Regards, >>Carolyn Chenery >> >>NERC Isotope Geosciences Laboratory >>Kingsley Dunham Centre >>Keyworth, Nottingham UK NG12 5GG >>Tel : +44 (0)115 9363100 (Switchboard) >>Tel : +44 (0)115 9363406 (Direct Line) >>FAX: +44 (0)115 9363302 >>e-mail [log in to unmask] > > > > >******************************** >Steve Nelson >Dept. of Geology >673 WIDB >Brigham Young University >Provo. Utah 84602 > >voice: 1-801-378-8688 >FAX: 1-801-378-8143 > >"INTEL INSIDE" is a warning label >********************************* > > ********************************************** Dr. Andrew R. Campbell * Professor of Geology * Dept. of Earth and Environmental Science * New Mexico Tech * Socorro NM 87801 * Phone: 505-835-5327 * Fax: 505-835-6436 * e-mail: [log in to unmask] * http://griffy.nmt.edu/homepage.html * **********************************************