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A different o ring

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A different o ring

Home › Forums › General Questions › A different o ring

Viewing 10 posts - 1 through 10 (of 10 total)
  • Author
    Posts
  • 13 July 2016 at 23:33 #246554
    Windy
    Participant
      @windy30762

      A query about O rings on my fuel and water pumps on the flash steamer water pump 0.25"Ø with silicone O rings no problems as regards resistance after a run they are not pressurizing then.

      0.1875"Ø fuel pump with Viton O ring after it has run there is resistance.

      The pumps are running at 2300 stroke per minute and fuel a mixture of paraffin and petrol.

      Before blast off pumps have little resistance.

      Silicone is not suitable for petrol and paraffin so is there are any other O ring material that would be slippy i.e. little resistance and seal the sliding rams.

      Pumps

      13 July 2016 at 23:33 #24641
      Windy
      Participant
        @windy30762
        14 July 2016 at 04:09 #246559
        Hopper
        Participant
          @hopper

          Teflon seal rings?

          14 July 2016 at 04:11 #246560
          Colin Whittaker
          Participant
            @colinwhittaker20544

            Nitrile and Viton were the two commonest O'rings we used to handle downhole mud pressures of many thousands of psi in the oil business. Not sue that you'll get the slipperiness that you require though.

            Colin

            14 July 2016 at 07:51 #246570
            David Jupp
            Participant
              @davidjupp51506

              As suggested by Hopper, PTFE – if you can get them in the required size.

              PTFE encapsulated rings may also be possible.

              PTFE 'O' rings are not that flexible, so can be a bit tricky to fit.

              14 July 2016 at 09:13 #246580
              Windy
              Participant
                @windy30762

                Thanks for the replies have look at the following link and concerned what pressures the Teflon will seal to and are the groove dimensions the same as for Viton or silicon.

                Are there any other types of material that is not on this link

                **LINK**

                14 July 2016 at 09:24 #246583
                MichaelR
                Participant
                  @michaelr

                  This UK site Here gives a lot of info on their O rings, it may be worth a look.

                  14 July 2016 at 09:24 #246584
                  David Jupp
                  Participant
                    @davidjupp51506

                    I have direct experience of PTFE O rings sealing to 25,000 psi on hydrocarbon duty (though that was in a check valve where there wasn't any measurable extrusion gap), PTFE or Viton were both options in the same groove. Same valve design is sold for 60,000psi duty. As mentioned the PTFE rings are quite stiff, so should not be particularly problematic handling higher pressures.

                    14 July 2016 at 11:43 #246596
                    Windy
                    Participant
                      @windy30762
                      Posted by MichaelR on 14/07/2016 09:24:14:

                      This UK site Here gives a lot of info on their O rings, it may be worth a look.

                      Very helpful

                      Paul

                      17 July 2016 at 18:53 #247009
                      Tim Stevens
                      Participant
                        @timstevens64731

                        Would it be silly to think of a PTFE piston running in your existing Viton seal?

                        Regards, Tim

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