Model 286.
Copyright information Trademark information Contact information © 2007 MTS Systems Corporation. All rights reserved. MTS and TestWare are registered trademarks of MTS Systems Corporation. MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com http://www.mts.
Contents Preface 5 About This Manual Conventions 6 7 Technical Support 8 Introduction 13 Overview of Typical Pore Pressure Intensifier System Description of Major Components Specifications and Dimensions 14 15 17 Operation 19 Functions of the Front Panel Controls High Pressure Precaution 20 22 High Temperature Precaution 22 Pore Pressure System Operation Considerations 23 Operating in Conjunction with a Confining Pressure System 23 Closed-loop Control Modes Used for Pressurizing Pore Fluid
Contents 286.
Preface Safety first! Before you attempt to use your MTS equipment in your test system, read and understand the Safety manual. Like an automobile, your test system is very useful—but if misused, it is capable of deadly force. You should not be afraid of your test system, but you should always maintain a healthy respect for it.
About This Manual About This Manual Purpose Summary Introduction Operation 6 Contents This manual provides detailed information about the Model 286.30 Pore Pressure Intensifier. The information includes an overview and operation. This manual includes the following sections. This section provides an overview of typical confining pressure control system, a description of major components, and specifications.
Conventions Conventions The following paragraphs describe some of the conventions that are used in your MTS manuals. Hazard conventions Hazard notices are embedded in this manual and contain safety information that is specific to the task to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow the directions that are given. Three different levels of hazard notices may appear in your manuals.
Technical Support Technical Support Start with your manuals The manuals supplied by MTS provide most of the information you will need to use and maintain your equipment. If your equipment includes MTS software, you should look for README files for additional product information. If you cannot find answers to your technical questions from these sources, you can use the internet, telephone, or fax to contact MTS for assistance.
Technical Support Before you contact MTS Know your site number and system number MTS can help you more efficiently if you have the following information available when you contact us for support. The site number contains your company number and identifies your equipment type (material testing, simulation, and so forth). The number is usually written on a label on your MTS equipment before the system leaves MTS. If you do not have or do not know your MTS site number, contact your MTS sales engineer.
Technical Support Know relevant software information • TestWorks 4 version; for example Version 4.09 • Names of other non-MTS applications that are running on your computer, such as screen savers, keyboard enhancers, print spoolers, and so forth If you contact MTS by phone Your call will be registered by a HELPLine agent if you are calling within the United States or Canada.
Technical Support Write down relevant information Prepare yourself in case we need to call you back. • Remember to ask for the notification number. • Record the name of the person who helped you. • Write down any specific instructions to be followed, such as data recording or performance monitoring. After you call MTS logs and tracks all calls to ensure that you receive assistance and that action is taken regarding your problem or request.
Technical Support 12 Contents 286.
Introduction This section describes the Model 286.30 Pore Pressure Intensifier, its role in the typical rock mechanics test system, and other system components typically used with the Pore Pressure Intensifier. Specifications and dimensions are also included. The Model 286.30 Pore Pressure Intensifier is designed to provide a source of fluid at pressures suitable for use in applying pore pressure to a rock specimen in a triaxial cell.
Overview of Typical Pore Pressure Intensifier System Overview of Typical Pore Pressure Intensifier System The major system components typically used with the Pore Pressure Intensifier are shown below. 815 *Feedback Signals Displacement* Pressure* Triaxial Cell Electronic Controller Equipment High Pressure Hoses Typical Load Frame (rear view) Pore Pressure Instensifier (PPI) Pressure Return Hydraulic Power Supply 286.
Description of Major Components Description of Major Components The following figure and table identify and describe the major components of the Model 286.30. 1 5 2 3 6A 4 6B 7 8 9 Pore Intensifier Major Components 286.
Description of Major Components Major Components Item Component Description 1 Cabinet Enclosure mounted on casters. Includes leveling legs for stability and a hinged rear access door. 2 Reservoir Clear acrylic container. Includes filler port with strainer which also acts as a vent for escaping gases. 3 Operator control panel The panel contains all the valves used during operation and includes a schematic of the unit as an aid during operation.
Specifications and Dimensions Specifications and Dimensions The following tables list the dimensions/weights and specifications for the Model 286.30 Pore Pressure Intensifier. Note Specifications and dimensions are subject to change without notice. Contact MTS for verification of specifications and dimensions critical to your requirements. Dimensions and Weights Parameter Parameter All Models Height 74 in. (1880 mm) Width 23.6 in. (600 mm) Depth 31.6 in.
Specifications and Dimensions 18 Introduction 286.
Operation This section contains procedures for all operations involving the flow and pressurization of pore fluid. All operating controls on the Pore Pressure Intensifier (PPI) are described. Safety considerations that should be observed while operating the Pore Pressure Intensifier are included.
Functions of the Front Panel Controls Functions of the Front Panel Controls The following figure shows the PPI’s operational controls, superimposed on the front panel hydraulic schematic. The following table describes items 1 through 5, shown in the figure. The table lists the operational effects of each individual control. However, note that performing the various operations listed in the table usually involves the manipulation of two or more of the controls. 1 4 5 3 2 20 Operation 286.
Functions of the Front Panel Controls ITEM CONTROL FUNCTION 1 Pore Fluid Output Adjustable hand-valve. Turning the valve counterclockwise toward Open allows air to be vented from the triaxial cell to the reservoir while filling the rock specimen’s pores with fluid. The valve is closed while pressurizing the pore fluid. 2 Pore Fluid Input Adjustable hand-valve.
High Pressure Precaution High Pressure Precaution WARNING Pore fluid can attain very high pressures. High pressure fluid can cause severe injury or death. Ensure pressure gage reads zero before opening the Pore Fluid Output valve. Follow all procedures provided by this manual. The Model 286.30 Pore Pressure Intensifier is capable of producing very high pressures.
Pore Pressure System Operation Considerations Pore Pressure System Operation Considerations Operating in Conjunction with a Confining Pressure System Rock mechanics studies typically involve the use of a triaxial cell, a pore pressure system and a confining pressure system. In such use, pore pressure is applied to the flat, end surfaces of a cylindrical rock specimen while confining pressure is applied to the curved, outer walls of the cylinder.
Pore Pressure System Operation Considerations Closed-loop Control Modes Used for Pressurizing Pore Fluid The pressure intensifier inside the PPI operates under closed-loop control principles. External electronic controller equipment receives signals from a pressure transducer in the PPI, and also from a linear displacement transducer, which indicates current pressure intensifier piston position relative to a reference position.
Pore Pressure System Operation Considerations Typical Calibration of Control Parameters The two control parameters, pressure and volumetric displacement (unlike the force parameter in axial testing, which usually has both tensile and compressive force directions or polarities) are uni-directional. Positive commands applied to the electronic controller equipment will cause pressure or volumetric displacement (depending on which parameter is being controlled) to increase to some positive level above zero.
Pore Pressure System Operation Considerations Effects of Thermal Expansion of Pore Fluid When heaters are used to heat the triaxial cell and the specimen and pore fluid, the pore fluid expands.
Pore Pressure System Operation Considerations Use of Error Detectors and Limit Detectors While Pressurizing Information under “Effects of Thermal Expansion of Pore Fluid” on page 26 describes two situations in which pore pressure can be, or can become, an uncontrolled variable.
Pore Pressure System Operation Considerations Effects of Air in the System, Need to Expel The operating procedures provided in this section include instructions for removing air or gases from the pressurized parts of the system whenever that is a concern.
Operating Procedures Operating Procedures The operating procedures are presented here in the usual order of occurrence. The first procedure, “Filling the Reservoir” on page 30, assumes the reservoir is to be filled for the first time, or that fluid quantity in the reservoir needs to be replenished. Subsequent procedures assume that the condition of the system is as established by the successful performance of the immediately preceding procedure.
Operating Procedures Filling the Reservoir One method of filling the reservoir is simply to remove the cap on the reservoir’s vent (top of reservoir) and to pour fluid in from the top. If the fluid source is pressurized, as with tap water or a pressurized container or one equipped with a pump, connection can be made directly to the capped port on the Reservoir Drain/Fill valve.
Operating Procedures Filling the Reservoir Close while filling through reservoir vent. Open while filling through reservoir drain/fill valve. 286.
Operating Procedures Filling the Pressure Intensifier It is necessary to perform this procedure only when the pore pressure end of the pressure intensifier contains air rather than pore fluid, for example, when using the PPI for the first time, or after overhaul or maintenance has been performed on the pressure intensifier. The figure shown at the end of this procedure shows the sequence of actions described in the procedure.
Operating Procedures Procedure: 1. Open the Intensifier Fill valve several turns counterclockwise. 2. Check that the Reservoir Return valve is fully closed. 3. Set up the PPI’s electronic controller for operation in the displacement control mode. 4. At the PPI’s controller equipment, turn on low hydraulic pressure. 5.
Operating Procedures Filling the Pressure Intensifier 2 - Close 7 - Open, two turns 9 - Close 1 - Open 6 - Close 9 - Open (closed) (closed) (Procedural steps not shown are performed on the controller equipment.) 34 Operation 286.
Operating Procedures Filling the Specimen’s Pores with Pore Fluid This procedure will cause pore fluid to flow into (and purge air from) the lines between the PPI’s pressure intensifier and the triaxial cell, the triaxial cell, the specimen’s pores, and the lines between the triaxial cell and the PPI’s Pore Fluid Output valve. (Pore fluid will be allowed to flow through the PPI’s Pore Fluid Output valve until a very small flow of pore fluid is seen entering the PPI’s reservoir.
Operating Procedures Procedure: 1. At the PPI’s control panel, open the Pore Fluid Input and Pore Fluid Output valves. 2. Set up the PPI’s electronic controller for operation in the pressure control mode. WARNING Hydraulic power will be applied during this procedure. Conditions that can be hazardous to life and equipment can exist on all systems or equipment that are connected to the same hydraulic power source.
Operating Procedures Note Perform step 6 only if the pressure intensifier reaches the end of its travel while bubbles are still being observed entering the reservoir. 6. If the pressure intensifier’s piston travels to the end of its stroke before a bubble-free flow of fluid is observed entering the reservoir, it will be necessary to stroke the actuator again to achieve the desired results. Do the following: 286.30 Pressure Intensifier A.
Operating Procedures Filling the Specimen’s Pores with Pore Fluid 5 - Close (closed) (closed) 1 - Open (closed) (Procedural steps not shown are performed on the controller equipment.) 38 Operation 286.
Operating Procedures Heating the Triaxial Cell Some users choose to heat the triaxial cell before applying test pressures to the cell. Others apply test pressures while the cell is heating. In either case, the PPI must be operated in pressure control mode during the heating process. Also, the Pore Fluid Output valve on the PPI’s front panel should be closed to prevent hot fluid from entering and damaging the reservoir.
Operating Procedures Pressurizing and Depressurizing the Pore Fluid Purpose of this procedure: Preliminary steps or conditions: This procedure describes how and when: A. to pressurize the pore fluid. B. to heat and cool the triaxial cell, if required. C. to depressurize the pore fluid at the end of the test. The pore pressure intensifier system should be in the same condition as existed after performing “Filling the Specimen’s Pores with Pore Fluid” on page 35.
Operating Procedures Procedure: First, check that the pressure intensifier piston is suitably positioned for pressurization operations Re-position the piston, if necessary 1. Observe the displacement signal to determine that the pressure intensifier’s piston is in a suitable position for performing pressurizing operations. Usually, the pressure intensifier’s piston is placed somewhere between 10% and 20% displacement before starting pressurizing operations.
Operating Procedures Pressurizing and Depressurizing the Pore Fluid 9 - Open (closed) 2C - Open 2D - Close (initially closed) (closed) 2B - Close 2E - Open 8 - Close (Procedural steps not shown are performed on the controller equipment.) Draining the Reservoir to an External Location To drain the reservoir: 1. Insert the end of the hose from the Drain/Fill valve into an external container. 2. Open the Drain/Fill valve. 42 Operation 286.
m MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com http://www.mts.
