The Experts below are selected from a list of 375132 Experts worldwide ranked by ideXlab platform

H Paul - One of the best experts on this subject based on the ideXlab platform.

  • New High-precision Reference Pressure Transducers from 1 MPa to 50 MPa
    Metrologia, 1994
    Co-Authors: H Paul
    Abstract:

    Calibration laboratories prefer to use piston manometers (dead-weight Testers) for calibrating Pressures in the range from a few pascals up to 1 000 MPa. The high-precision Pressure transducer P31AP is an alternative that can be calibrated as a secondary Pressure standard and used as a reference Pressure transducer. When using reference Pressure transducers a simple manual or motor-driven Pressure source should be available. The Test Pressure has no longer to be produced precisely as the actual Pressure value can be measured by the reference Pressure transducer at any time. Therefore there is nothing to prevent complete computer-controlled calibration of Pressure transducers.

Ihsan Murat Gok - One of the best experts on this subject based on the ideXlab platform.

  • Application of modern well Test analysis techniques to Pressure transient Tests in Kizildere geothermal field, Turkey
    Geothermics, 2003
    Co-Authors: Mustafa Onur, Ayse Donmez Zeybek, Umran Serpen, Ihsan Murat Gok
    Abstract:

    Abstract The analyses of two build-up Tests and one interference Test in the Kizildere geothermal field, Turkey, are presented. Modern well Test analysis methods based on Pressure-derivative (logarithmic time rate of Pressure) and non-linear regression, as well as conventional log–log and semi-log straight-line methods, have been used in the interpretation of these field Pressure Tests. Pressure transient models based on both homogeneous reservoirs and fractal reservoirs without matrix participation are considered in the analysis. It is shown that the use of conventional analysis methods alone can lead to an inaccurate interpretation of these field Tests, and the use of modern analysis techniques in conjunction with conventional analysis techniques provides a more reliable and accurate interpretation of the well Test data in the Kizildere geothermal field. The information obtained (e.g., estimates of permeability thickness and fractal dimensions) from analyses of these Tests should prove useful for reservoir characterization studies in the Kizildere field, where reinjection is scheduled to begin soon. Finally, the modern interpretation methods described in this paper are recommended for analysis of well Test Pressure data from geothermal reservoirs.

Josep Roca - One of the best experts on this subject based on the ideXlab platform.

  • Instrumentation Viewpoint 835 m3 Pressure HULL DESIGN AND CONSTRUCTION OF THE mANNED
    2016
    Co-Authors: Submersible Ictineu, Alex Alcocer, Pere Fores, Gian Piero Giuffre, Carme Parareda, Adria Roca, Josep Roca
    Abstract:

    Abstract – This paper describes the design and construction of the Pressure hull of Ictineu 3, a manned submersible with a maximum operative depth of 1200m. The design and manufacturing process of a Pressure hull is a cumbersome engineering challenge because of the extreme Pressure conditions and extremely low tolerances required by the certification agency. The Pressure hull has been calculated and de-signed under the ASME PVHO-1-2007 and Germanischer Lloyd rules, and Finite Ele-ment Method (FEM) simulations have been performed. It will be Tested in an auto-clave at a Test Pressure corresponding to 1440m. The Pressure hull is composed of an stainless steel body with two acrylic spherical sectors, one is the top hatch and the other is a large front window that will provide the crew an exceptional wide field of view. The steel has been spefically selected due to its excellent mechanical properties and its high corrosion resistance

  • Pressure hull design and construction of the manned submersible ictineu 3
    Instrumentation viewpoint, 2009
    Co-Authors: Alex Alcocer, Pere Fores, Gian Piero Giuffre, Carme Parareda, Adria Roca, Josep Roca
    Abstract:

    This paper describes the design and construction of the Pressure hull of Ictineu 3, a manned submersible with a maximum operative depth of 1200m. The design and manufacturing process of a Pressure hull is a cumbersome engineering challenge because of the extreme Pressure conditions and extremely low tolerances required by the certification agency. The Pressure hull has been calculated and designed under the ASME PVHO-1-2007 and Germanischer Lloyd rules, and Finite Element Method (FEM) simulations have been performed. It will be Tested in an autoclave at a Test Pressure corresponding to 1440m. The Pressure hull is composed of an stainless steel body with two acrylic spherical sectors, one is the top hatch and the other is a large front window that will provide the crew an exceptional wide field of view. The steel has been spefically selected due to its excellent mechanical properties and its high corrosion resistance.

  • Manned Submersible Ictineu 3: Design and Construction of the Pressure Hull
    2007
    Co-Authors: Alex Alcocer, Pere Fores, Gian Piero Giuffre, Carme Parareda, Adria Roca, Josep Roca
    Abstract:

    This paper describes the design and construction of the Pressure hull of Ictineu 3, a manned submersible with a maximum operative depth of 1200m. The Pressure hull is composed of two stainless steel spheres of 1700mm and 800mm of internal diameter. The material was specifically selected for its excellent mechanical properties and its high corrosion resistance. The main sphere is equipped with a large acrylic spherical sector window that provides the crew with an exceptionally wide field of view. The Pressure hull, designed under the ASME PVHO-1-2007 and Germanischer Lloyd rules, will be Tested in an autoclave at a Test Pressure corresponding to 1440m. Finite Element Method (FEM) simulations were performed. The design and manufacturing process is a cumbersome engineering challenge because of the extreme Pressure conditions and extremely low tolerances required by the certification agency.

Z. Dibi - One of the best experts on this subject based on the ideXlab platform.

  • Characterisation and modelling of the mismatch of TCRs and their effects on the drift of the offset voltage of piezoresistive Pressure sensors
    Sensors and Actuators A-physical, 2000
    Co-Authors: Ali Boukabache, Patrick Pons, Gabriel Blasquez, Z. Dibi
    Abstract:

    Abstract Based on the assumption that each piezoresistor of a silicon Pressure sensor has its own temperature coefficients (TCRs of the first and second order), a theoretical model has been developed in order to study the thermal behaviour of the offset voltage. We first derive the expression for the drift of the output voltage of each potentiometric circuit obtained from the whole bridge, and then that for the thermal variations of the offset voltage itself. It is shown that the existence of a small difference between the temperature coefficients of the four piezoresistors can provoke thermal variations of the output voltages whose shapes can obey to a linear or a parabolic law. On the other hand, we have used an experimental procedure, on our Test Pressure sensors, allowing us to extract the piezoresistors TCRs, to measure the thermal drifts of the output voltage of each half-bridge, and those of the whole bridge. The application of the theoretical model shows that there exists a good accordance with the experimental results. The parabolic shapes of the outputs of the two half-bridges, and also that of the offset voltage, are explained by the mismatch of the TCRs of the four piezoresistors.

Mustafa Onur - One of the best experts on this subject based on the ideXlab platform.

  • Application of modern well Test analysis techniques to Pressure transient Tests in Kizildere geothermal field, Turkey
    Geothermics, 2003
    Co-Authors: Mustafa Onur, Ayse Donmez Zeybek, Umran Serpen, Ihsan Murat Gok
    Abstract:

    Abstract The analyses of two build-up Tests and one interference Test in the Kizildere geothermal field, Turkey, are presented. Modern well Test analysis methods based on Pressure-derivative (logarithmic time rate of Pressure) and non-linear regression, as well as conventional log–log and semi-log straight-line methods, have been used in the interpretation of these field Pressure Tests. Pressure transient models based on both homogeneous reservoirs and fractal reservoirs without matrix participation are considered in the analysis. It is shown that the use of conventional analysis methods alone can lead to an inaccurate interpretation of these field Tests, and the use of modern analysis techniques in conjunction with conventional analysis techniques provides a more reliable and accurate interpretation of the well Test data in the Kizildere geothermal field. The information obtained (e.g., estimates of permeability thickness and fractal dimensions) from analyses of these Tests should prove useful for reservoir characterization studies in the Kizildere field, where reinjection is scheduled to begin soon. Finally, the modern interpretation methods described in this paper are recommended for analysis of well Test Pressure data from geothermal reservoirs.