Sounding Rods & Tubes

bar CPT tubes
Thread types The GeoMil sounding tubes have a standardized OD of 36 mm and an ID of 16 mm and provide high precision tapered threads.

The steel quality is chosen with utmost care and next to the high grade steel composition, the sophistictated and manifold tempering and squeezing procedures guarantee for unsurpassed material quality and straightness. For the raw material, GeoMil only accepts and processes hollow tubes, drawn over mandrill but not welded or drilled from solid material.

Machining the threads follows a fully automatic and robotised sequence (see picture), allowing us to ensure a constant quality and conformity with the most stringent standards regarding dimensions, straightness and thread tolerances (e.g. the NEN-5140). On request, we send a tube certificate when suppling the tubes.

Next to the three GeoMil thread types "Speedlock", "Heavy" and "Standard", any third party thread type can be machined as well.

All GeoMil tubes can be delivered from stock for the standard lengths of 1 000 mm, 500 mm and 300 mm. Bulk quantities and/or special lengths can be produced within a couple of days.

For connecting tubes, friction reducers or cones coming with different thread types (also non-GeoMil) we provide respective cross-overs and adapters in various lengths.

Please see the data sheet for additional information and listing available sounding tubes, casing tubes, cross-overs and friction reducers. 		Certificate, click to enlarge
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bar Speedlock™ thread
Speedlock The GeoMil Speedlock™ thread for CPT sounding tubes forms a dual lead rope thread provding a tensional strength, approximately 30% stronger than the conventional standard thread. Demolition tests, carried out in 2005, also revealed that forces acting perpendicular on the tube string (like they occur during tube bending or aprupt cone deviation when the CPT cone slides along an obstacle) must reach more than 65kN before the threaded tube ends fail. (about 50% higher than for standard threaded tubes).

You can watch a short video (3MB) to get an impression.

The strong Speedlock™ thread is also less susceptible to dirt and only 2½ turns are required to screw or unscrew the tubes. Adding and removing tubes during sounding is thus faster and less straining.

In short, working with Speedlock™ tubes is faster, safer, more economic and simply smart.
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bar Standard & Heavy thread
Heavy Standard and Heavy threads form conventional single lead tapered threads requiring 7 turns to be fastened.

Due to the slightly enlarged wall thickness the Heavy threads tensional strength is about 20% stronger than for the Standard type.

The Heavy thread is very much preferred for off-shore soundings, where the the extra turns for fastening can form an advantage over the Speedlock™ type.

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