Sub-slab soil gas sampling system
A system for sampling sub-slab soil gas having an adaptor body that includes a first barbed portion, a collar portion, a second barbed portion, an internal cavity that axially passes through the length of the adaptor body, and a coupling portion. The system further includes one or more extensions such as a fitting extension, a filter extension, a sieve extension and a length extension, each of which are threadably retainable with the coupling portion of the adaptor body.
1. A system for facilitating the sampling of a sub-slab soil gas comprising:
an adaptor body having a length and proximal and distal ends, comprising:
a first barbed portion disposed at the proximal end of the adaptor body;
a second barbed portion disposed at the distal end of the adaptor body;
a collar portion disposed between the first barbed portion and the second barbed portion;
an internal cavity having an interior surface and passing through the length of the adaptor body; and
a coupling portion comprising an internal thread disposed on the interior surface and extending longitudinally thereon from the distal end of the adaptor body; and
an extension having a length and first and second ends, comprising:
an internal cavity extending longitudinally through the extension from the first end of the extension to an outlet at the second end of the extension; and
an external thread disposed at the first end adapted for complimentary threaded retention within the coupling portion of the adaptor body.
2. The system of claim 1 wherein the extension is a fitting extension, the fitting extension further comprising a fitting portion disposed at the outlet.
3. The system of claim 1 wherein the extension is a fitting extension, the fitting extension further comprising a barbed portion disposed at the outlet.
4. The system of claim 3 further comprising:
a length extension having first and second ends coupled to and between the adaptor body and the fitting extension, the length extension further comprising:
an internal cavity having an interior surface extending longitudinally through the length extension from the first end to the second end;
an external thread disposed at the first end adapted for complimentary threaded retention within the coupling portion of the adaptor body; and
a coupling portion comprising an internal thread disposed on the interior surface and extending longitudinally thereon from the second end of the length extension, wherein the internal thread is adapted to threadably retain the external thread of the fitting extension.
5. The system of claim 3 further comprising an external engaging portion disposed between the external thread and the barbed portion of the fitting extension.
6. The system of claim 1 wherein the extension is a filter extension, the filter extension further comprising a filter element disposed at the outlet.
7. The system of claim 6 further comprising:
a length extension having first and second ends coupled to and between the adaptor body and the filter extension, the length extension further comprising:
an internal cavity having an interior surface extending longitudinally through the length extension from the first end to the second end;
an external thread disposed at the first end adapted for complimentary threaded retention within the coupling portion of the adaptor body; and
a coupling portion comprising an internal thread disposed on the interior surface and extending longitudinally thereon from the second end of the length extension, wherein the internal thread is adapted to threadably retain the external thread of the filter extension.
8. The system of claim 1 wherein the extension is a filter extension, the filter extension further comprising:
a filter element having an attachment aperture and at least one internal rib disposed within the attachment aperture; and
a barbed portion having at least one barb disposed at the outlet, wherein the barbed portion is retained within the attachment aperture of the filter element by complimentary engagement between the at least one internal rib and the at least one barb.
9. The system of claim 8 wherein the filter element comprises a sintered porous metal.
10. The system of claim 8 further comprising an external engaging portion disposed between the external thread and the barbed portion of the filter extension.
11. The system of claim 1 wherein the extension is a sieve extension, the sieve extension further comprising a plurality of lateral outlets wherein each lateral outlet intersects with the internal cavity of the sieve extension.
12. The system of claim 11 further comprising an external engaging portion disposed at the second end of the sieve extension.
13. The system of claim 12 wherein the external engaging portion has a length and a circular cross-sectional shape with two opposing parallel sides.
14. The system of claim 13 wherein the plurality of lateral outlets comprises at least one pair of outlet cavities extending laterally through the engaging portion in an intersecting “X” pattern.
15. The system of claim 13 wherein the plurality of lateral outlets comprises three pair of outlet cavities extending laterally through the engaging portion, each in an intersecting “X” pattern.
16. The system of claim 11 further comprising:
a length extension having first and second ends coupled to and between the adaptor body and the sieve extension, the length extension further comprising:
an internal cavity having an interior surface extending longitudinally through the length extension from the first end to the second end;
an external thread disposed at the first end adapted for complimentary threaded retention within the coupling portion of the adaptor body; and
a coupling portion comprising an internal thread disposed on the interior surface and extending longitudinally thereon from the second end of the length extension, wherein the internal thread is adapted to threadably retain the external thread of the sieve extension.