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A magnetic flowmeter flowtube assembly includes a conduit with a first end and a second end. A first neck flange is coupled to the first end of the conduit and has an inside diameter with a first notch extending radially outwardly therefrom. A second neck flange is coupled to the second end and has

A magnetic flowmeter flowtube assembly includes a conduit with a first end and a second end. A first neck flange is coupled to the first end of the conduit and has an inside diameter with a first notch extending radially outwardly therefrom. A second neck flange is coupled to the second end and has an inside diameter with a second notch extending radially outwardly therefrom. A fluoropolymer liner is disposed within and extends through the first neck flange, the conduit and the second neck flange. A pair of electrodes is mounted relative to the liner to measure a voltage induced within a process fluid flowing through the liner. A first spring-energized seal ring is disposed in the first notch and a second spring-energized seal ring disposed in the second notch. A method of sealing a magnetic flowmeter having a fluoropolymer liner is also provided.

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1. A magnetic flowmeter flowtube assembly comprising: a conduit having a first end and a second end;a first neck flange coupled to the first end, the first neck flange having a first inside diameter with a first notch extending radially outwardly from the inside diameter, the first notch comprising

1. A magnetic flowmeter flowtube assembly comprising: a conduit having a first end and a second end;a first neck flange coupled to the first end, the first neck flange having a first inside diameter with a first notch extending radially outwardly from the inside diameter, the first notch comprising a first interior surface, the first interior surface comprising a first surface opposing a second surface, wherein the first and second surfaces are angled with respect to each other;a second neck flange coupled to the second end, the second neck flange having an inside diameter with a second notch extending radially outwardly therefrom, the second notch comprising a second interior surface, the second interior surface comprising a third surface opposing a fourth surface, wherein the third and fourth surfaces are angled with respect to each other;a fluoropolymer liner disposed within and extending through the first neck flange, the conduit and the second neck flange;a pair of electrodes mounted relative to the liner to measure a voltage induced within a process fluid flowing through the liner;a first spring-energized seal ring disposed in the first notch, the first spring-energized seal ring comprising a first face configured to abut the first interior surface; anda second spring-energized seal ring disposed in the second notch, the second spring-energized seal ring comprising a second face configured to abut the second interior surface. 2. The magnetic flowmeter flowtube assembly of claim 1, wherein the first spring-energized seal is constructed, at least in part, from the same material as the fluoropolymer liner. 3. The magnetic flowmeter flowtube assembly of claim 1, wherein the first spring-energized seal includes a spring that is constructed from the same material as the first neck flange. 4. The magnetic flowmeter flowtube assembly of claim 1, wherein the first spring-energized seal includes a spring that is constructed from the same material as the pair of electrodes. 5. The magnetic flowmeter flowtube assembly of claim 1, wherein the first surface is substantially perpendicular to an axis of the conduit. 6. The magnetic flowmeter flowtube assembly of claim 5, wherein the first notch also includes an outer surface that meets the first surface at a substantially right angle. 7. The magnetic flowmeter flowtube assembly of claim 6, wherein the second surface comprises an angled surface opposing the first surface, such that the notch is configured to facilitate insertion of the first spring-energized seal. 8. The magnetic flowmeter flowtube assembly of claim 1, wherein the first spring-energized seal includes a chamfered spring. 9. The magnetic flowmeter flowtube assembly of claim 1, wherein the first spring-energized seal includes an opening facing a mounting face of the first neck flange. 10. The magnetic flowmeter flowtube assembly of claim 9, wherein the second spring-energized seal includes an opening facing a mounting face of the second neck flange. 11. The magnetic flowmeter flowtube assembly of claim 1, and further comprising at least one coil disposed to generate an electromagnetic field relative to process fluid flowing through the liner. 12. The magnetic flowmeter flowtube assembly of claim 11, and further comprising transmitter electronics coupled to the pair of electrodes and the at least one coil. 13. The magnetic flowmeter flowtube assembly of claim 1, wherein the fluoropolymer liner undergoes cold flow with pressure changes. 14. The magnetic flowmeter flowtube assembly of claim 13, wherein fluoropolymer is polytetrafluoroethylene (PTFE). 15. The magnetic flowmeter flowtube assembly of claim 1, wherein the first neck flange is a first weld neck flange. 16. The magnetic flowmeter flowtube assembly of claim 1, wherein the second neck flange is a second weld neck flange. 17. The magnetic flowmeter flowtube assembly of claim 1, wherein at least one of the electrodes includes a spring-energized seal. 18. The magnetic flowmeter flowtube assembly of claim 17, wherein each of the electrodes includes a spring-energized seal. 19. A method of sealing a magnetic flowmeter having a fluoropolymer liner, the method comprising: providing a flowtube assembly having a pair of neck flanges, each neck flange having an inside diameter with a notch extending radially outwardly therefrom;inserting a spring-energized seal into each notch, wherein each notch is configured to provide a robust seat for receiving the spring-energized seal; andinserting a fluoropolymer liner into the flowtube assembly after insertion of the spring-energized seals. 20. The method of claim 19 and further comprising chemically bonding the fluoropolymer liner to the flowtube assembly. 21. The method of claim 20, wherein the fluoropolymer liner is chemically bonded to the flowtube assembly at flared portions extending axially from each of the neck flanges. 22. The method of claim 19, wherein the spring-energized seals are selected to have a material in common with at least one of the neck flanges. 23. The method of claim 19, wherein the spring-energized seals are selected to have a material in common with the fluoropolymer liner. 24. A magnetic flowmeter flowtube assembly comprising: a flowtube configured to receive a flow of process fluid, the flowtube including a first neck flange, a conduit, and a second neck flange;a fluoropolymer liner disposed within and extending through the flowtube;a plurality of electrodes disposed to measure a voltage induced within the process fluid;a first spring-energized seal interposed between the liner and the flowtube in a first notch within the first neck flange, the first notch being configured to provide a robust seat for receiving the first spring-energized seal;a second spring-energized seal interposed between the liner and the flowtube in a second notch within the second neck flange, the second notch being configured to provide a robust seat for receiving the second spring-energized seal; andwherein the first and second spring-energized seals are disposed on opposite sides, relative to process fluid flow (upstream/downstream), of the plurality of electrodes.