User Manual

286.20 Pressure Intensifier Introduction
13
Introduction
This section describes the Model 286.20 Confining Pressure Intensifier (CPI), its
role in the typical rock mechanics test system and other system components
typically used with the Confining Pressure Intensifier. Specifications and
dimensions are also included.
The Model 286.20 Confining Pressure Intensifier is designed to provide a source
of fluid at pressures suitable for use in the confining pressure chamber of a
triaxial cell. The CPI is used to fill the triaxial cell with confining fluid,
pressurize the fluid, control the pressure, and empty the fluid from the triaxial
cell at the conclusion of a test.
Some model versions produce confining pressures up to 140 MPa (20,000 psi).
When connected to a fluid-filled triaxial cell, the maximum fluid volume that can
flow during pressurization of the external device and its specimen can be as high
as 1300 cubic centimeters (80 cubic inches). See “Specifications and
Dimensions” on page 18 for specifications for all models.
Triaxial
Cell
Open Close
Confining Fluid Input
Open Close
Confining Fluid Output
Open Close
Reservoir Fill
Fluid
Reservoir
Open Close
Intensifier Fill
Pressure
Intensifier
Low Pressure
Relief
Pressure
Transducer
Low pressure line
High pressure line
286.20
Confining
Pressure
Intensifier
r
Fluid Filter
Off
Fluid Transfer Pump Control
Air supply in
100 psi max.
Air Driven
Hydraulic
Pump
Fluid Direction
A
B
C
C
A
B
Empty
Reservoir
From fluid
supply or to
empty fluid
Fill system from
fluid supply
using pump
Fill system
from reservoir
using pump
Confining
Pressure
AB
A
B
Air Direction
Air supply into empty
traxial cell.
Bleed air into reservoir
when filling triaxial cell.
psi
bar
High Pressure
Relief
Air Pressure
Relief
815
Fluid
Resivoir
Control
Panel