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107 results about "Nominal size" patented technology

In manufacturing, a nominal size or trade size is a size "in name only" used for identification. The nominal size may not match any dimension of the product, but within the domain of that product the nominal size may correspond to a large number of highly standardized dimensions and tolerances. For example, dimensional lumber sizes such as "2 by 4" refers to a board whose finished dimensions are closer to 1 ¹⁄₂ inches by 3 ¹⁄₂ inches. A "3 ¹⁄₂-inch" floppy disk's standard dimension is 90 mm, or 3.54 inches, and is advertised to hold "1.44 megabytes" although its capacity is 1,474,560 bytes. A "³⁄₄-inch pipe" in the Nominal Pipe Size system has no dimensions that are exactly 0.75 inches. A screw thread has a number of dimensions required to assure proper function but is referred to by a nominal size and a thread design family, for example "¹⁄₄ inch, 20 threads per inch, Unified National Coarse". In the UK, pipe is available that is quoted in both metric size and imperial size. The metric size is larger than the imperial size.

Multitube reactor, vapor phase catalytic oxidation method using the multitube reactor, and start up method applied to the multitube reactor

A multitube reactor, wherein tubes having smaller tolerance between a nominal size and actual sizes are used as reaction tubes to stably perform a high yield reaction for a long period, a catalyst is filled into the reaction tubes so that the catalyst layer peak temperature portions of the reaction tubes are not overlapped with the connection sites thereof with baffles to effectively prevent hot spots from occurring and stably perform a reaction for a long period without the clogging of the reaction tubes, a heat medium and raw material gas are allowed to flow in the direction of a countercurrent and a specified type of catalyst is filled into the reaction tubes so that activity is increased from the inlet of the raw material gas to the outlet thereof to prevent the autooxidation of products so as to prevent equipment from being damaged due to the reaction, and, at the time of starting, gas with a temperature of 100 to 400° C. is led to the outside of the reaction tubes to increase the temperature of the reaction tubes and, a heat medium, which is solid at the room temperature, is heated to circulate to the outside of the reaction tubes to efficiently start up the reactor without affecting the activity of the catalyst.
Owner:MITSUBISHI CHEM CORP

Multitube reactor, vapor phase catalytic oxidation method using the multitube reactor, and start up method applied to the multitube reactor

A multitube reactor, wherein tubes having smaller tolerance between a nominal size and actual sizes are used as reaction tubes to stably perform a high yield reaction for a long period, a catalyst is filled into the reaction tubes so that the catalyst layer peak temperature portions of the reaction tubes are not overlapped with the connection sites thereof with baffles to effectively prevent hot spots from occurring and stably perform a reaction for a long period without the clogging of the reaction tubes, a heat medium and raw material gas are allowed to flow in the direction of a countercurrent and a specified type of catalyst is filled into the reaction tubes so that activity is increased from the inlet of the raw material gas to the outlet thereof to prevent the autooxidation of products so as to prevent equipment from being damaged due to the reaction, and, at the time of starting, gas with a temperature of 100 to 400° C. is led to the outside of the reaction tubes to increase the temperature of the reaction tubes and, a heat medium, which is solid at the room temperature, is heated to circulate to the outside of the reaction tubes to efficiently start up the reactor without affecting the activity of the catalyst.
Owner:MITSUBISHI CHEM CORP

Asphalt mixture mineral aggregate gradation composition design method using internal friction angle as design index

InactiveCN106351099AReduced potential for shear flow deformationImprove stabilityIn situ pavingsFilling materialsNominal size
The invention belongs to the technical field of traffic civil engineering application, and particularly relates to an asphalt mixture mineral aggregate gradation composition design method using the internal friction angle as a design index. A stage-by-stage filling theory is used; materials with the lower stage of particle diameter D1 are filled into maximum-nominal-size NMAS; by measuring the internal frictional angle phi of aggregates at different proportions, the proportion corresponding to the maximum internal frictional angle is used as an optimum composition proportion for forming the mineral stable framework; by such analogy, the optimum composition proportion relationship of each grade of coarse aggregates in the asphalt mixture can be obtained, so that a stable coarse aggregate framework structure is formed. Then, a bailey method is used for designing the fine aggregate and filling material proportion; the mineral aggregate gradation designed by the method provided by the invention realizes shearing resistance and compactness. The method has the advantages that the targeted performance is good; by aiming at the physical damage features of track damages of the asphalt pavement in Guangxi high-temperature hot and humid area, i.e., the insufficient high-temperature stability, the track-resistant asphalt mixture mineral aggregate gradation is designed; the mineral aggregate gradation has a stable framework compact structure.
Owner:GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD

Method for measuring deviation of nominal size of bore diameter of bearing inner ring

Disclosed is a method for measuring the deviation of the nominal size of the bore diameter of a bearing inner ring. The measuring device is composed of a first positioning ball (1), a positioning sleeve (2), a pressure spring (3), a cover plate (4), a measuring instrument (5), a measuring rod (6), a balancing rack (7), a second positioning ball (8), a positioning sleeve (9) and a radial moving positioning ball (10). Reference calibration is based on h=r-1/2(4r2-C3)1/2, a first standard block (11), a second standard block (12), a third standard block (13) are provided, and an original value is obtained. The distance between two points where first positioning ball and the second positioning ball contact with the bearing inner ring is equal to the chord length of the bearing inner ring with a bore diameter of 2r, a height difference h formed by the connecting line of the horizontal line of the contact point of the radial moving positioning ball and the inner ring bearing, and the distance of the two points is equal to the chord height of the bearing inner ring with a bore diameter of 2r, so that the difference between the measuring value and the original value is the deviation of the nominal size of the bore diameter of the bearing inner ring.
Owner:LUOYANG BEARING SCI & TECH CO LTD
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