Model 286.
Copyright information Trademark information Contact information © 2007 MTS Systems Corporation. All rights reserved. MTS is a registered trademark 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 Confining Pressure Control System Description of Major Components Specifications and Dimensions 14 16 18 Operation 19 Control Panel 20 High Pressure Precaution 22 High Temperature Precaution 22 Confining System Operation Considerations Operating Procedures 23 27 Filling the Reservoir From An External Source 28 Filling the Pressure Intensifier From an External Container Filling the
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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 Preface This manual provides detailed information about the Model 286.20 Confining 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 Preface 286.
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.
Overview Of Typical Confining Pressure Control Overview Of Typical Confining Pressure Control System The major system components typically used with the Confining Pressure Intensifier are shown in the following figure. As shown in the figure, a separate hydraulic power supply acts as the primary power source for the Confining Pressure Intensifier.
Overview Of Typical Confining Pressure Control Pressure and displacement transducers in the CPI provide signals proportional to their respective variables, enabling the external electronic controller equipment to measure these variables and to control either the pressure produced by the CPI, or the linear displacement of the pressure intensifiers piston relative to a fixed reference.
Description of Major Components Description of Major Components The following figure and table identify and describe the major components of the Model 286.20. 1 5 2 3 6A 4 6B 7 8 9 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.
Description of Major Components 4 Pressure transducer Provides a signal which represents the level of confining fluid pressure being applied to the triaxial cell. The signal is used by the electronic controller equipment as feedback when pressure is the controlled variable. 5 Pressure relief valve Relieves pressure in the system if pressure exceeds the CPI’s pressure rating by a certain amount.
Specifications and Dimensions Specifications and Dimensions The following tables list the dimensions, weights, and specifications for the Model 286.20 Confining Pressure Intensifier. Dimensions and Weights PARAMETER ALL MODELS Height 1825 mm (72 in.) Width 600 mm (23.6 in.) Depth 845 mm (33.3 in.) Weight 454 kg (1000 lb.) Reservoir Capacity 11.4 liters (3.0 gallon) PARAMETER MODEL 286.20-08 MODEL 286.20-10 Maximum Output Pressure, MPa/PSI 80/12,000 140/20,000 Output Volume cu. cm/in.
Operation This section contains procedures for all operations involving the flow and pressurization of confining fluid. All operating controls on the Confining Pressure Intensifier (CPI) are described. In addition to the Confining Pressure Intensifier, a confining pressure system typically includes a hydraulic power supply, some type of electronic controller equipment, and a triaxial cell.
Control Panel Control Panel The following figure shows the operational controls, superimposed on the front panel hydraulic schematic. The following table describes items 1 through 8, 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. r 286.
Control Panel 3 Air Direction Two position hand-valve. Position “A” enables air to escape from the triaxial cell to the reservoir when filling the triaxial cell with confining fluid. Position “B” allows compressed air to force confining fluid from the triaxial cell to the reservoir, when emptying fluid from the triaxial cell. (If the valve handle is positioned mid-way between “A” and “B,” the valve is turned off.) 4 Confining Fluid Input Adjustable hand-valve.
High Pressure Precaution High Pressure Precaution WARNING Confining fluid can attain very high pressures. High pressure fluid can cause severe injury or death. Ensure pressure gage reads zero before opening the Confining Fluid Output valve. Follow all procedures provided by this manual. The Model 286.20 Confining Pressure Intensifier is capable of producing very high pressures.
Confining System Operation Considerations Confining System Operation Considerations The following paragraphs provide some general information about operation of the CPI. Closed-Loop Control Modes Used For Pressurizing Confining Fluid When pressurizing the confining fluid, the pressure intensifier inside the CPI operates under closed-loop control principles.
Confining System Operation Considerations Effects of Thermal Expansion of Confining Fluid When heaters are used to heat the triaxial cell, the specimen and the confining fluid, the confining fluid expands. Thermal expansion when operating in pressure control mode If the confining pressure system is being operated in the pressure control mode while the triaxial cell is being heated, pressure inside the triaxial cell normally will not increase as temperature rises.
Confining System Operation Considerations Use of Error Detectors and Limit Detectors While Pressurizing Information under heading Effects of Thermal Expansion of Confining Fluid describes two situations in which confining pressure can be, or can become, an uncontrolled variable.
Confining System Operation Considerations Effects of Air In The System The operating procedures provided in this section include instructions for removing air from the pressurized parts of the system before pressurizing the confining fluid.
Operating Procedures Operating Procedures The operating procedures, which follow, are presented in the usual order of occurrence. The first, “Filling the Reservoir From An External Source” on page 28, 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 From An External Source The following procedure will fill the reservoir from an external fluid container. The following figure shows the sequence of actions described in the procedure. Note Preliminary steps Procedure The fluid to be added must be a recommended type (see “Specifications and Dimensions” on page 18) and the same as any fluid currently in the Confining Pressure Intensifier. (Don’t mix fluid types.) A.
Operating Procedures Filling the Reservoir From An External Source r 286.20 7 - Watch level Confining Pressure Intensifier Fluid Reservoir Confining Fluid Output Reservoir Fill Open Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. traxial cell.
Operating Procedures Filling the Pressure Intensifier From an External Container Note This procedure is used only when filling the pressure intensifier for the first time. It is used after filling the reservoir for the first time and it purpose is to establish operating fluid levels in the CPI. For filling the pressure intensifier during daily operation of the CPI, see “Filling the Pressure Intensifier From The Reservoir” on page 32.
Operating Procedures Filling the Pressure Intensifier From an External Container r 286.20 Confining Fluid Output Open Fluid Reservoir 6 - Watch for bubbles and fluid level Confining Pressure Intensifier Reservoir Fill Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. traxial cell.
Operating Procedures Filling the Pressure Intensifier From The Reservoir Note Purpose of this procedure Procedure If you are filling the pressure intensifier for the first time, perform the procedure under heading “Filling the Pressure Intensifier From an External Container” on page 30. This procedure is used for normal, dayto day use prior to pressurizing operations. The purpose of this procedure is to establish three simultaneous conditions in preparation for pressurizing the confining fluid: A.
Operating Procedures Filling the Pressure Intensifier From The Reservoir r 286.20 Steps 4 through 6, 9, and 10 are performed on the test controller and not shown here Fluid Reservoir Confining Pressure Intensifier Confining Fluid Output Reservoir Fill Open Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. traxial cell.
Operating Procedures Filling the Triaxial Cell Note Preliminary step A. Procedure Before starting this procedure, decide whether the triaxial cell (or pressure vessel) will be filled from the reservoir or from an external fluid container. See Heading 2.5.5. Normal operating procedure when operating with an MTS triaxial cell, is to fill the triaxial cell from the CPI’s fluid reservoir.
Operating Procedures Filling the Triaxial Cell r 286.20 Confining Fluid Output Open Fluid Reservoir 9 - Watch for bubbles and fluid level Confining Pressure Intensifier Reservoir Fill Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. 5 - Open traxial cell.
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 CPI must be operated in pressure control mode during the heating process. Also, the Confining Fluid Output valve on the CPI’s front panel should be closed to prevent hot fluid from entering, and damaging, the reservoir.
Operating Procedures Pressurizing and Depressurizing The Confining Fluid This procedure describes how to pressurize and depressurize the triaxial cell and indicates the proper time to heat and cool the triaxial cell. Purpose of this procedure: This procedure describes how (and when): A. To make sure the pressure intensifier’s piston is properly positioned for pressurizing the triaxial cell. B. To heat and pressurize the triaxial cell. C.
Operating Procedures Procedure: to position the pressure intensifier’s piston 1. Configure the confining pressure system’s controller for the displacement control mode. (The pressure control mode will be used later while pressurizing the triaxial cell.) 2. On the triaxial cell, close the lower confining pressure valve. (Leave the triaxial cell’s upper valve open.) 3. On the CPI, open the Intensifier Fill valve. 4. Make sure the CPI’s Reservoir Fill valve is fully clockwise to the Close position. 5.
Operating Procedures 12. On the CPI’s pressure controller, perform the operations necessary to bring triaxial cell confining pressure to test level. The CPI’s confining pressure gage will provide an approximate indication of confining pressure but the readout capabilities of the CPI’s electronic controller should by used where any precision is required. cooling and depressurizing the triaxial cell 13.
Operating Procedures Pressurizing and Depressurizing The Confining Fluid r 286.20 Fluid Reservoir Confining Pressure Intensifier Confining Fluid Output Reservoir Fill Open Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. 18 - Open traxial cell.
Operating Procedures Cooling The Triaxial Cell and Confining Fluid CAUTION Temperature of fluid in the triaxial cell can exceed the temperature rating of the Confining Pressure Intensifier. This could damage the Confining Pressure Intensifier. Always allow fluid in the triaxial cell to cool to 167∞F (75∞C) or less before emptying the triaxial cell back to the reservoir of the Confining Pressure Intensifier. The CPI has a temperature rating of 167°F (75°C).
Operating Procedures Emptying the Triaxial Cell CAUTION Temperature of fluid in the triaxial cell may exceed the temperature rating of the Confining Pressure Intensifier. This could damage the Confining Pressure Intensifier Always allow fluid in the triaxial cell to cool to 167∞F (75∞C) or less before emptying the triaxial cell back to the reservoir of the Confining Pressure Intensifier. Procedure: 1. Verify that the triaxial cell has cooled to 167°F (75°C) or less. 2.
Operating Procedures Emptying the Triaxial Cell r 286.20 Confining Pressure Intensifier 7 - Watch the reservoir Fluid Reservoir 5 - Open (one turn) 8 - Watch for bubbles 8 - Close Confining Fluid Output Reservoir Fill Open Open Close Intensifier Fill Close Open Close Air Direction air into reservoir A Bleed when filling triaxial cell. 4 - Open (one turn) traxial cell.
Operating Procedures Draining the Reservoir to an External Location Procedure: 1. Connect a hose between the connector on the lower side of the Fluid Direction valve (rear side of control panel) and the external fluid container. 2. Set the Fluid Direction valve to position B. Confining fluid in the fluid reservoir will flow into the container by means of gravity. Draining the Reservoir To An External Container r 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.
