The Drive-Points attach to inexpensive 3/4' (20 mm) NPT stainless steel drive pipe. The Drive-Points are designed for single use installations, and not for removal and reuse. Solinst Drive-Point Piezometers are most often installed as permanent well points. They can also be used for temporary, short term monitoring applications.
Higher quality samples can be obtained when polyethylene or PTFE-lined tubing is attached to the stainless steel drive-point. Groundwater sampling and hydraulic head measurements can be taken within the tubing using small diameter equipment, as described here.
Solinst Drive-Point Piezometers can be driven into the ground with any direct push or drilling technology, including the Manual Slide Hammer shown at right. To avoid clogging or smearing of the screen during installation, a shielded version is also available.
For the most inexpensive wellpoint installations, the Manual Slide Hammer can be used to install the Solinst Drive- Point Piezometers. The 25lb (11Kg) slide hammer and all other equipment can easily be transported in a car or truck to most sites.
A heavy duty drive head is used, on which the slide hammer impacts, and a tubing by-pass ensures that the tubing does not get damaged during installation.
Drive-point piezometers are not suitable for all sites. The depth limitations vary, especially with soil conditions and the drive method used. Model 615 Drive-Point and Shielded Drive-Point Piezometer.
Model 615 Drive-Point Piezometers have a stainless steel, 50 mesh cylindrical filter-screen, within a 3/4' (20 mm) stainless steel drive-point body, screen support and an optional fitting for attachment of sample tubing.
The 615 N or 615 SN, designed without a tubing barb, is to be used for water level measurements. This saves money and provides better access for Water Level Meters.
The 615 or 615 S has an inner barbed fitting for 5/8' OD x 1/2' ID (16 mm x 12 mm) LDPE or PTFE-lined sample tubing. This prevents sample water from contacting the extension rods, and maintains high sample integrity, even when inexpensive galvanized steel extensions are used.
The 615 C is ideal for soil vapor sampling. Where an air-tight connection is most desirable, the compression fitting option allows users to attach 1/4' (6 mm) sample tubing directly to the top of the screened portion of the drive-point.
The 615 S and 615 SN shielded drive-points have a single use, 1-1/2' (38 mm) dia. shield to avoid smearing and plugging of the screen during installation. The strengthened connector at the top of the drive-point acts as an annular seal, which avoids contamination from higher levels in the hole.
Stainless Steel Drive-Point Piezometers
Solinst Drive-Point Piezometers are available in five different configurations; the 615 with a barbed fitting, the 615 N with no barbed fitting, the 615 C with a compression fitting, the 615 S with a barbed fitting and shield, and the 615 SN with a shield
Heavy duty couplings are available for the Model 615 Drive-Point Piezometers. The reinforced shoulder gives added support to the pipe threads, to withstand driving stresses and to give more accurate alignment. The maximum OD is 1.5' (38 mm).