Orbit Research Associates Private Limited

The tests are performed in a triaxial cell capable of supporting up to 100 MPa for confining and deviatoric stress on geo-materials cored or manufactured in diameters ranging from 20 mm to 100 mm and heights from 40 to 200 mm. Multiple sensors can continuously monitor axial and radial deformations of the sample, as the parameters of pressure applied. The tests can be performed at room temperature, but there are also different versions of the equipment that can be heated up to 200 °C.
In addition to the axial and radial pressures that can carry many mechanical tests, the sample can be subjected to a pressure drainage, gas or liquid. It is then possible to perform permeability tests.
The unit is managed with an Industrial Control System that allows real time monitoring all measured parameters and controlling the different pressure circuits.

Self Compensated Cell
An intermediate chamber compensates the axial stress created by the confining pressure on the sample and changes in confining pressure have no influence on the axial pressure.

This unit may nevertheless be used for axisymmetric testing by sealing the chamber circuit.
A Full potential of Testing
The first tests presented below are used to measure the mechanical properties of a sample.These tests use independently or simultaneously, the opportunities provided by the axial pressure and the confining pressure. Each circuit for axial or radial stress is controlled by a High Pressure Metering Pump to a level of constant, variable, or cyclic pressure. The circuits are controlled by an industrial control system. All thesetests can be performed without drainage in the sample or a sample put under pressure by internal drainage.
 

Unconfined (uniaxial) compression tests

Hydrostatic Tests

Triaxialbasic test

Creep test

Triaxialproportional or additive

Triaxiallateral extension

Confined Tensile tests

 
The second series of tests presented to measure the permeability of a sample while subjecting it to fixed or variable mechanical stresses. As for mechanical tests, permeability tests can be performed at room temperature but also at temperatures up to 200 ° C.
 

Determination of crack porosity

Determination of Biot and Skemton coefficient.

Static permeability

Testing of dynamic permeability

Pulse test permeability

Shear test or splitting

Freetrial

 
Finally, it is also possible to use the machine as a simple Rock Stac press by removing the containment. It is thus possible to perform standard tests of fracture mechanics without drainageand room temperature.
 

Braziliantest

3-point bending

Doubletwist

Testof perforated plate

Determination ofseals closure under normal test

We offer a full range of cells to measure porosity and permeability:

Rock Top 10 serie can be used for low pressure, up to 240 (3500 psi).

Rock top 20 and Rock Top 30 series can be used for high pressure, up to 600 bar ( 9000 psi).

Can be used at room temperature or up to 150°C.

All cells include a confining pressure system, only the Rock Top 30 also include a piston with an axial force. Fluid used : water.

Samples sizes: 1 inch 1.5 inch( 38mm) 2 inches (50 mm) 4 inches (100 mm)

Manual screw closing or bolted sealing depending on the presssure range.

Body material: 1.4404 (316 L).

European comformity accordings to the European Pressure Directive 97/23

We offer followings equipment equipments :

• Geo-mechanical tests under pressure on soils, rocks, cements and concrete
• Triaxial tests in fissuring, drainage, permeation, percolation, creep…..
• Measures of displacement, dilatation, flow.

We proposes a Hassler type cell which is Easy to use, inexpensive, it makes permeability tests easy to carry out.

Features of the Hassler Cell:

• For all pressures between 0 and 600 bar.
• For all temperatures from 0 to 200°C
• Sample Ø: from 5 to 50 mm.
• Fluids: gas, liquid or supercritical fluids
• Material: 1.4404 (316L) or Hastelloy
• Sample viton jacket with probes inserted at the top in order to measure pressure drop.
• Closure through conical shutter and screwed in cylinder head.
• Internal temperature monitoring
• PED 97/23/EC Compliant

Options of the Hassler Cell:

• HPMP Pressure generator
• Confinement pressure control.
• Control of upstream and downstream draining pressures.
• Maximum pressures of up to 1500 bar.