ugg italia Online verification system flow of crud

Online verification system flow of crude oil problems and corrective measures

Factors, causing the certification process repeatability error is mainly due to excessive unit pulse Roots Flowmeter unevenness represented too much volume, piston pulse calibration device to receive too few. I plant the oil flow meter use Kaifeng Instrument Factory production of Roots Flowmeter: A 250 LL model, the accuracy class 0.2. Flow range 120mh ~ 600m'h, measuring chamber volume of about 35L (4 turn rotation of the waist can be discharged more than about 160L of crude oil.) Wheel rotating at the waist every moment of the flow is not steady, there are certain fluctuations, the sender when the gear-driven devices, due to the backlash wander, and cycle the drive shaft to reverse the effects of irregular pulse is generated (ie, round the waist flow volume represented by the unit impulse uneven degree.) The piston prover the number of pulses received less uniformity of the pulse, very strict rules. Through several experiments testing the flow meter repeatability error seriously overweight. Therefore, the calibration device with a piston flow upstream of the existing volume of 16o. 6419L LL can not be used for a 25O Roots Flowmeter. Fourth, corrective measures 1. Transformation of flow in the flowmeter chamber Q with the addition of partitions,[link widoczny dla zalogowanych], the measurement chamber from the 35L volume decreased to 32L, 5 weeks even if the flow meter rotor rotation displacement and flow calibration device close to the upstream volume of 160L, for with 5oo a / week high pulse sender device, the pulse sender added to the back wheel for direct rotation axis, which can reduce the gear Q gland, the error caused by periodic effects, increasing the transmission ratio, to improve reception pulses. 2. 21,300 volume tube measurement technology transformation. № 11 to the upper piston volume of the volume control down to 140L or so, that is, a 250 LL Roots Flowmeter displacement of the rotor rotation for 4 weeks; and change the use of 500 / week high pulse signaling device. Need to do the following: (1) changing the position of photoelectric detection switch. (2) increased a second-class standard gauges 140L. (3) volume re-test. Although the second approach feasible, but the volume control volume decrease. Reduce the number of received pulses, and after transformation can only be applied to a flow meter. Therefore, we adopt the first method wrapped by the Kaifeng Instrument Factory meter to complete the transformation. Fifth, the effect of modified and further improve measures 1. After transformation, flow meter,[link widoczny dla zalogowanych], send certified by Kaifeng, we re-test three meters, repeatability error has been greatly reduced, but there are some excessive. Extract test records, including: Model 250 LL of a flow meter number FE 100/h300m/h total number of pulses of a 1l7 basic error of the flow coefficient K E repeatability SN (times) (L / s) (times / liter )(%)( %) 253340.16552l5.77076-0.0582253240.22247l5.76883-0. O427253140.30007l57588O-0.01770.107253l40.31872l575395-0. Ol85253140.34451l5.760l2-0.0O932. Repeatability error is also excessive for some, can be taken to increase the test frequency, and the results averaged flow coefficient obtained for future operation. Practice shows that increasing the number of tests, can improve the flow coefficient (average) accuracy. Standards in foreign countries, can take this approach to determine flow volume tube with a small coefficient. China has not yet had such a standard, so use this method to determine the coefficients do not meet specifications. 3. Use a large volume of standard volume tube (1) standard volume standard volume of relatively large tubes, allow at least 10,000 pulses sent from the meter, so you can ignore the error caused by uneven flow meter pulses. (2) standard volume control, good reproducibility, high accuracy,[link widoczny dla zalogowanych], high accuracy flow meter can test. (3) the pressure in the normal work flow and temperature conditions, with crude oil was flowmeter real solution to the flow meter test site, so use the same test conditions and overcome the different working conditions caused by the error. (4) during the certification process verification system for the entire flow system and the temperature is stable, reduce the temperature difference caused by the error. (5) flow meter for checking the whole process, do not start and stop the flow, due to start and stop flow while eliminating the error caused. (6) of the original system and the turbo mixed calibration system, volume control and difficult to clean, but also easily lead to series of oil production on the unsafe. Our factory has been chosen DN300 Kaifeng Instrument Factory of the UG-based standard volume control, maximum flow rate 600 / h value of the standard volume of 3m3,[link widoczny dla zalogowanych], repeatability ≤ 0.02%,[link widoczny dla zalogowanych], is expected to be completed by the end of installation. It's put into use, will solve the online test meter.

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