(Calibration Instruments, Standards and Reference Sources)
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The paper briefly describes the basic Harwood apparatus, particularly the deviations from the original Bridgman model and the elaboration thereof by Birch for uses with gases at high temperature.... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
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A dead-weight piston manometer which serves as a standard for accurate measurements of pressures up to 2 GPa is described.... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
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Precision experiments with manganin wirefor the measurement of high pressures are made difficult by virtue of the temperature-resistance response of the manganin. The equilibrium time required for... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
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The paper describes a 15-atmosphere differential mercury manometer and a group of piston gages constructed and maintained at the National Bureau of Standards in connection with the determination of... (View Full Article)
(Pressure Sensing)
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When considerable mechanical power is transmitted to the inside of a pressure vessel by means of a moving shaft, controlling leakage, wear, and friction becomes more difficult as pressure drop in the... (View Full Article)
(Pressure Sensing)
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A number of improvements in the apparatus and technique have been made since the production of the prototype model of the controlled-clearance piston gauge used by Johnson and Newhall in their 1953... (View Full Article)
(Valves)
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Some tumbling barrel type mixers require that the vessel be isolated during treatment of the charge. The present paper describes a valve designed and constructed for such a purpose. The valve is... (View Full Article)
(Calibration and Testing Services)
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From the earliest days of scientific studies of lubrication, the importance of lubricant viscosity has been recognized. As increased recognition came of the magnitude of the pressures encountered,... (View Full Article)
(Pressure Sensing)
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The AIRAPT Task Group on the International Practical Pressure Scale (IPPS) was created at the 6th AIRAPT Conference and given the chance to make recommendations leading to the establishment of an... (View Full Article)
(Gas Handling Equipment)
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Changing gasoline quality is behind some of the poor performance and drivability problems drivers complain about, and it undoubtedly has caused unnecessary repairs. Auto and oil companies don't agree... (View Full Article)
(Pressure Sensing)
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Current procedures used for the calibration of ballistic pressure tranducers at BRL are described. Checks include evaluation of continuity, hysteresis, and zero return characteristics as well as... (View Full Article)
(Pressure Sensing)
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This paper presents and discusses the results obtained with the controlled-clearance balance as compared to a differential-piston type conventional balance.... (View Full Article)
(Pressure Sensing)
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Techniques for calibrating ballistic pressure transducers include the ballistic pulse method, shock-tube methods, and pressure-step techniques. A positive-going, high-pressure-step generator is useful... (View Full Article)
(Pressure Sensing)
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Here is presented a method of determining the effective area of the gage at all pressures that does not involve measurements of the effect of jacket pressure on the measured pressure.... (View Full Article)
(Materials Processing Equipment)
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Proceedings of the Fourth International Conference on High Pressure, Kyoto, 1974.... (View Full Article)
(Pressure Sensing)
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Measurements of Young's modulus as a function of pressure up to 10,000 bars at 20°C show that the glass transition temperature in natural and synthetic rubbers is raised by pressure. For natural... (View Full Article)
(Pressure Sensing)
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Reliability and accuracy of pressure measurements are of prime importance in the field of chemical engineering, the power generation industry, oil exploration, aircraft operation, and materials... (View Full Article)
(Pressure Sensing)
From this Article:
Change of effective area as a function of pressure limits accuracy of a piston gage at pressures above a few thousand atmospheres and has a significant effect in precision work at a few hundred... (View Full Article)
(Pressure Sensing)
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Out of concern for public safety, most legal jurisdictions now require unfired pressure vessel construction to comply with the ASME Boiler and Pressure Vessek Code. Because the present two divisions... (View Full Article)
(Pressure Sensing)
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This paper covers the design and the operational and performance characteristics of a precision pressure generation system utilizing a controlled-clearance type of piston gage. Programmed computer... (View Full Article)
(Calibration and Testing Services)
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This paper describes, from a historical view, the evolution of static and dynamic pressure seals based on the unsupported area and the controlled clearance principles.... (View Full Article)
(Pressure Sensing)
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The new bulk-modulus-cell high-pressure gage provides ruggedness and reliability for the ranges between 0-50,000 and 0-200,000 psi.... (View Full Article)
(Pumps)
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Excessive torque, side thrust, and friction make crank-driven pumps cumbersome and expensive at high pressures. But in hydraulically driven pumps, these effects are eliminated or minimized and higher... (View Full Article)
(Pressure Sensing)
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The problem of generating high pressure gas at a reasonable rate while keeping the gas uncontaminated is one that has bothered chemical process engineers and experimentalists for some time. With the... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
From this Article:
Previously published "accuracy charts" relating to standards in pressure measurement are revised in Fig. 1 (Ref. 1). The vertical scale represents the accuracy attainable expressed in terms of... (View Full Article)
(Calibration and Testing Services)
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Since 1948, Harwood Engineering Company, Inc. has supplied, internationally, 14 kilobar equipment for the autofrettage of weapons and industrial process equipment. Concurrently, controlled cyclical... (View Full Article)
(Tanks and Vessels)
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Various types of high-pressure apparatus utilize compound cylinders to contain pressure in the range up to about ten GPa (100 kbar). Compound construction vessels usually consist of a high strength... (View Full Article)
(Pressure Sensing)
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Reprinted from MEASUREMENTS AND DATA - November & December 1969.... (View Full Article)
(Pressure Sensing)
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High-pressure can be measured by (1) dead-weight gauges, (2) elastic deformation gauges - Bourdon gauge, stain gauge, bulk-modulus cell, or (3) change in electrical resistance of some materials.... (View Full Article)
(Calibration and Testing Services)
From this Article:
A method is shown to monitor the depth of plastic yielding, the permanent expansion of the cylinder and the amount of residual strain during hydraulic autofrettage. The significance of the residual... (View Full Article)
(Tanks and Vessels)
From this Article:
A method is presented of designing optimum proportions for cylinders in the composite design of a pressure vessel that limits catastrophic fatigue failure.... (View Full Article)
(Pumps)
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Discontinuous or fluctuating flow rates frequently present process control problems particularly where high and often even moderate pressures are involved, due principally to the compressibility of... (View Full Article)
(Pressure Sensing)
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Pressure transmissibility of selected fluids were studied in fluid filled high pressure tubing of various lengths and diameters. These tubings were always close at one end and connected at the other... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
From this Article:
The effect of piston rotation speed and fluid viscosity on the performance of free-piston gauges with a controlled clearance was studied as part of an experimental program aiming at the better... (View Full Article)
(Calibration and Testing Services)
From this Article:
A revised equation is presented for the effective piston area of controlled clearance deadweight testers from the theory of elasticity which accounts for the semi-infinite loading of the measured... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
From this Article:
In connection with the work of the National Physical Laboratory on the P-V-T relationships of gaseous mixtures, attention has been given to improvement in the accuracy of high-pressure measurements... (View Full Article)
(Pressure Sensing)
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This paper shows the effects of fluid pressure to 140 ksi on four different types of foil stain gages. Linear pressure-strain curves were obtained for these gages mounted on flat surfaces of tungsten,... (View Full Article)
(Pressure Sensing)
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The mercury melting line has been determined for pressures up to 1200 MPa. The change of electrical resistance in the mercury sample was used for detecting the equilibrium between the solid and liquid... (View Full Article)
(Calibration Instruments, Standards and Reference Sources)
From this Article:
The errors which must be considered for accurate measurements of pressure with piston gages are discussed. A new design of piston gage is described which permits the operator to control the clearance... (View Full Article)