| 摘要 |
The use of extruded plastic continuous-multi-channel (CMC) tubing for conveying water samples from different depths up out of boreholes is enhanced by the compressed-grommet sealing system as described. The rubber grommet is placed inside one of the many conduits of the tubing, and squeezed lengthwise, whereby the grommet expands laterally and seals and plugs the conduit. When forming a port in the conduit, an aperture is cut in the wall of the conduit, and plug-assemblies having the grommets are placed above and below the port. Ledges on the plug-assemblies engage the ends of the aperture, and operate in conjunction with spacer bars in the aperture to prevent the plug-assemblies being moved along the conduit by pressure in the conduit. Some of the conduits in the CMC tubing are left unplugged, for admitting probes, sensors, etc.
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