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Thread gauge of ordinary work wear limit calculated diameter


Back to the head of canal. If the poor field conditions must demand changes in the pipe installed below the guide with a valve connected to pressure tube should be first, and then slowly bent down, and then become connected with the poor in order to avoid the pipe pressure pipe of the liquid into the conduction measurement accuracy . (3) The pressure transmitter pressure transmitter installed generally in accordance with the following installation order. Select a location: pressure sensors to take pressure pipe between the mouth and does not allow throttle valve and other parts; When measured medium is liquid, gas or solid particles in order to avoid pressure into the guide tube, for horizontal or skewed pipeline, taking pressure port should be open half plane in the pipeline, and with the vertical angle is 45. Appropriate; When measured medium is gas, in order to prevent liquid or dust into the conduction pressure tube, pressure port should be opened to take the upper half-plane in the pipeline; When measured medium is steam, taking pressure in the pipeline to open the side of the general population. (4) Commissioning and Operation of the system check the pressure leading connection system normal, no leakage of the valve sealed differential pressure transmitter with high and low pressure chamber and elbows, the inside of the mapping connection; to ensure that the transmitter \\Grounding; system discharge, off the sides of the three valve guide valve, open the balance valve, a valve will open to the maximum,[link widoczny dla zalogowanych], open drain valve, cleaning or purging pressure leading system, sewage thoroughly, toxic and hazardous media sewage , pay attention to safety; steam measurement, differential pressure transmitter zero as easily influenced by temperature, but also the difference becomes zero adjustment (zero), and when positive and negative side of the condenser is not in the same two disc level height, both sides of the guide tube surface pressure height difference will produce an additional error, we need to undertake differential migration (- subsurface migration or differential pressure transmitter zero migration); put into operation pressure transmitter, open the pressure valve the door to work, but the measurement of steam or liquid, the pressure change to take pressure away from the mouth of the vertical distance is larger, leading the liquid column pressure pipe will cause high pressure change indication at this time must be zero on the pressure change adjustments to ensure accuracy. 5 Conclusion In conclusion, differential pressure flow meters and similar compared to bend flow meter does have a lot of new advantages, not only one device structure is simple, do not ask the DC section, and because there is no insert,[link widoczny dla zalogowanych], so throttling losses greatly reduced, with energy-saving role in the current context of building a conservation-oriented society more meaningful. On the other hand, the bend sensor geometry and manufacturing processes require a higher limit is not very high accuracy. Coupled with the installation of the signal transmission unit for different media, different spatial location on the installation has different requirements, in order to ensure measurement accuracy, a certain amount of maintenance, making it subject to certain widely used, but could meet the general industrial flow measurement . Can predict that, with continued progress in theoretical research and measurement principles of continuous improvement, machinery manufacturing and processing technology continues to improve, pipe flow measurement accuracy will further improve measurement systems will further simplify the optimization, it will be very broad application prospects . About the author: Liu Jianguo,[link widoczny dla zalogowanych], male, engineer. Company: Sinopec PSTC Technology Department. Address: Xuzhou City, Jiangsu Province 221008, China Zhai Mountain Pipeline Storage and Transportation Company Technology Department. Received Time :2005-10-14 (on the next page 20) (4) only the client thread ring wear limit bite 1_ by the formula (4) that D2 = d2 + IR + a 2 a value of the various elements of the formula: 0d2 by the formula (6) by d2 = d a 2 × curse at = 18.701 (mm) from the table to look up the thread,[link widoczny dla zalogowanych], e, es = a 71/ma when P = 2, the tolerance level for six, by the table Richard outside the pitch diameter tolerance = 160 (), so,[link widoczny dla zalogowanych], and then from the table to look up in the 125-200 range corresponding to, respectively 18p. rn, 15, urn. = 18p. rnG = 15tma so the thread ring wear limit, a D2 = d2 + eleven + = 18.476 (mm) 4 In conclusion, the above calculation method can work on different specifications of the common thread gauge the diameter is calculated to wear limit of the theoretical value obtained for the majority of staff in the detection or measurement of thread personnel manual to be investigated in the non-threaded cases, to provide a convenience. References [1] Ye-Tai Fei, Xu Sen Qi, Li Zhijian ed. New thread measurement manual. Anhui Science and Technology Press, 1988. [2] JJG888-95 (cylindrical thread gauge test procedures.) Author: Qian Xiang Xin, male, assistant engineer. Company: Jiaxing City, Zhejiang Province, metrological verification tests. Address: Hongxing Road, Jiaxing, Zhejiang 314001 88. Received Time :2005-08-22

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