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The
OFITE Model 250 Compressive Strength Tester accurately determines the
compressive strength of a well cement. The most common means of
determining the compressive strength of a cement involves applying a
force to the sample at a constant rate until the sample fails. The
maximum loading at which the cement fails is defined as the cement's
compressive strength. Unfortunately, data obtained from this type
of testing is typically inconsistent and widely varied because manually
operated hydraulic presses have been used for testing purposes and
maintaining a constant loading rate is very difficult, even for the most
experienced operator. The OFITE Model 250 incorporates an
electronically actuated proportional control valve that automatically
maintains the desired loading rate. Operator inconsistencies are
virtually eliminated and data obtained with the OFITE Compressive
Strength Tester is consistent and highly reproducible.
Method of Operation:
A cement slurry is prepared according to the guidelines outlined in API
Specification 10 and placed into typical 2" × 2" × 2"
cement molds. The molds are then placed into a curing chamber
(autoclave) and allowed to cure at either simulated well conditions or at
temperatures and pressures classified by a schedule within API
Specification 10. The cement specimens are allowed to cure for a
predetermined amount of time and then removed from the curing chamber.
The sample is then placed onto the platen of the Model 250. From
this point on, all operation is controlled by software running on a
supplied PC. Pressure is increased at the specified loading rate
until the specimen fails. The software graphs the test data and
stores it for later recall.
Features and Specifications:
- Maximum press capacity of 40,000 lbs
- Self-aligning hardened platens
- Microprocessor controller
- Loading rates variable from 200 to 4,000 PSI/min
- Safety head and rupture disk prevent over pressurization
- Digital-instrumentation incorporates high pressure alarms
- Proportional control valve accurately controls load rate
- Safety shield protects operator
- Control stand remotely located from hydraulic press
- Dual switch procedure ensures operator safety
Instrument Requirements:
115 Volt, 50/60 Hz, requires 1 KVA
230
Volt, 50/60 Hz, requires 1 KVA
Crated Size: 56 x 50 x 32 inches (142.2 x 127 x 81.3 cm)
Crated Weight: Approximately 1,000 lbs (454 kg)
Components:
#120-75-5 Contactor (230 Volt)
#120-75-5-1 Contactor (115 Volt)
#130-75-71 Monitor
#130-75-74 Desktop Computer
#130-76-11 Terminal
#130-76-48 Power Supply
#130-79-04 DAQ Card for Desktop Computer
#130-79-06 Cable
#130-79-09 50-Channel Connector Board
#130-79-10 8-Channel Relay Board
#130-79-14 Printer
#152-37 AC Power Cord, 3-Conductor (115 Volt)
#152-38 AC Power Cord, 3-Conductor (230 Volt)
#165-01 On-Off Switch
#171-48-3 Plug Receptacle
#900-190 Stainless Steel Plug for 1⁄4" Swagelok Tube
Fitting
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![[Image of 120-28]](120-28.jpg)