| 摘要 |
<p>1409079 Testing fluid-tightness of tubular bodies PONT-A-MOUSSON SA 8 Dec 1972 [30 Dec 1971 9 Oct 1972] 56711/72 Heading G1S To test the fluid-tightness of a tubular body, e.g. a pipe T, a vacuum is created within the pipe using a vacuum-creating unit 28 and 29, and an annular assembly E or Ea is placed around the pipe and moved back and forth along it, the assembly directing helium against the exterior of the pipe so that if any helium penetrates the wall of the pipe it is drawn off by a pump 33, accumulated in a chamber 31 downstream of an orifice 30 and detected as by a mass spectrograph 32. In the embodiment shown in Fig.1, the assembly E is coupled with a carriage 10 travelling on a rail 11, and helium is supplied on a pipe 15 to a central chamber 13 for direction through orifices 16 against the pipe T, excess helium passing into side recesses 14 and being extracted through a hood 24. In an alternative embodiment shown in Figs. 4 and 5, the annular assembly Ea comprises hinged sectors 51-53 of a cylindrical shell which by means of hydraulic cylinders 58, 59 can be folded around the pipe T. Helium is supplied to the space between the cylindrical shell and the pipe T by systems 44-47. Guide rollers 60-65 are provided within the shell for bearing on the exterior of the pipe T as the assembly Ea is moved along the pipe by carriage 10a. A hydraulic mechanism D is provided for raising and lowering the hinged assembly Ea. In either embodiment, an extension 19 or 19a of the annular assembly may be provided to test the fluid-tightness of an enlarged end socket c of the pipe.</p> |
