How to maintain the orifice flowmeter? After being put into operation, it should pay attention to maintenance and regular inspection, and find that abnormal phenomena should be dealt with in time.
How to maintain the orifice flowmeter? After being put into operation, it should pay attention to maintenance and regular inspection, and find that abnormal phenomena should be dealt with in time.
(1) Pay attention to whether the pipeline of the inspection device is leaking. Once the leak is found, force the union nut hard and replace the gasket if necessary.
(2) Generally, the pipeline is drained once every 1-2 months. When draining, close the balance valve and open the drain valve. After the discharge medium is cleaned, close the drain valve. After the pressure guiding line is cooled to the normal temperature, reopen the balancing valve.
(3) The instruments of each unit of the device are specially adjusted according to the design method before leaving the factory, and the user shall not arbitrarily adjust it according to the routine, otherwise the design intention of the device may be completely destroyed and the measurement error may be caused. Conditional users are required to fully understand the adjustment principle of this device. Please contact our factory at that time, and you can view the theoretical calculation data and master the adjustment method. The user is not allowed to arbitrarily move without knowing the adjustment method of the device, and the user should be responsible for the consequences. Our factory can carry out consulting services on this device.
The company's products mainly include LG standard and non-standard throttling devices, vortex flowmeters, electromagnetic flowmeters, metal tube float flowmeters, turbine flowmeters and other products. Products are widely used in chemical, sewage, oil and gas, metallurgy, pulp and paper, food and beverage, pharmaceutical and other industries. With first-class technology, first-class management, manufacturing first-class products, creating first-class services, building first-class brands, and building first-class enterprises, we operate in accordance with international standards, national standards, industry standards and strict internal control standards. , fine processing, lean manufacturing, lean detection, to provide users with high precision, high reliability, high stability, high security products and quality services.
1. Orifice flowmeter throttle assembly assembly: the orifice plate is placed in the negative ring chamber groove (the flange is pressed without positive and negative ring chamber, the hole is directly installed in the flange ring groove, the orifice plate and the two flanges The asbestos pad is lined between them. The orifice of the orifice plate is in the same direction as the fluid. Then, under the strict concentricity of the pipe, flange and orifice plate, the clamping flange can be tightened with the bolt clamp), and the bell mouth is turned to the negative ring. Room; add a 1-2mm thick asbestos pad between the positive ring chamber and the orifice plate. The positive and negative ring chambers are pressed tightly. The asbestos pad should not protrude into the pipe; then the ring chamber clamping flange on the 10D long measuring pipe section is aligned. Ring chamber with a 2mm thick asbestos pad in the middle; the ring chamber clamping flange on the 5D long measuring pipe section is aligned with the negative ring chamber, and a 2mm thick asbestos pad is placed in the middle to place the positive and negative ring chamber on the clamping flange. Position the pin bolt (see 13 in Figure 3), adjust the pipe, flange, ring chamber, orifice plate are strictly concentric; the two condensation tanks are vertically downward and keep the height equal; the water hole on the orifice plate is under Tube wall; finally tighten the clamping flange with bolts, check that there is no leakage. If the cleaning orifice plate is replaced and the ring chamber is removed, the clamping flange bolt is removed, and the ring chamber is lifted upwards to remove the ring chamber and the orifice plate (the flange can be removed by loosening the clamping flange bolt). board). The flow direction of the fluid is as shown by the arrow in Fig. 4, that is, the fluid enters the throttling assembly from the upstream measuring pipe section (10D long) of the throttle member, and flows out from the downstream measuring pipe section (5D long) through the positive and negative ring chambers. (Flange pressure, the fluid directly passes through the flange and the orifice plate into the downstream measuring pipe).
2. Orifice flowmeter throttling assembly and user pipe connection: according to the measured size of the assembled throttling assembly and the connecting flange (see L in Figure 3, must be measured), cut a section on the user pipeline The installed throttle assembly has a strict dimensional fit with the user's piping. Referring to Figure 3, the user pipeline cut length can generally be 30 mm less than the measured dimension L (as a mounting clearance, for reference only). The connecting flange and the user pipe are welded between the two flanges to seal the asbestos pad and clamped.
3. The installation position of the orifice flowmeter throttling assembly: the straight pipe section must be long enough before and after the throttle (L1 and L2 in Fig. 4), then the fluid flow into the throttle is turbulent flow velocity distribution, otherwise The abnormal flow velocity distribution of the vortex or the swirling flow directly affects the measurement accuracy, so in principle, the longer the straight pipe section before and after the throttle piece, the better. However, due to the limitation of the user's installation site, the straight pipe section is generally not too long, and most of the user's pipe sections will have many types of bending and other types of local resistance parts (see Table 1), so it is necessary to make appropriate position selection on site to ensure The measurement accuracy of the device, otherwise the measurement results will cause additional errors. According to the distribution of the local resistance of the user pipe line and the diameter ratio β of the designed throttle, the appropriate length of the straight pipe is selected from Table 1. For example, a user pipe laying is the third type in Table 1, β = 0.5, then L1 = 20D (number outside the parentheses) is selected as the best, the additional relative error is zero, such as taking L1 = 10D (number in parentheses) to cause ±0.5% additional error. According to the above principle, the user selects a long straight pipe as much as possible to install the flow device.
4. Laying of the positive and negative pressure guiding lines of the orifice flowmeter: The user-prepared Ф16×3 seamless steel pipe is used as the pressure guiding pipe, take the appropriate length, and bend the two guiding pressures of the device into appropriate angles, and connect them by fire welding. Note that the positive and negative ring chambers are connected with the positive and negative pressure chambers of the differential pressure transmitter (flange pressure is taken, and the two flanges in the direction of the fluid are respectively connected with the positive and negative pressure chambers of the differential pressure transmitter). As shown in Figure 3, for the user pipe above the instrument cabinet, the two pressure-conducting pipelines should be laid balanced, with a horizontal inclination of not less than 1 to 12, to prevent accumulation of air bubbles in the pressure-conducting pipeline to affect the normal pressure; regardless of the user Whether the pipeline is horizontal or vertical (1 in Figure 5), the two condensing tanks are equal in height, and the two pressure guiding tubes are parallel downward. If it is laid outdoors, the pressure guiding tube should be insulated to prevent freezing and cracking in winter. Loss of pressure guiding effect. It is used when the user pipe route is laid lower than the instrument cabinet. It is still ensured that the two condensation tanks are parallel downward, and the pressure guiding tube welded at the lower end thereof must have a "U"-shaped elbow of 0.7-1 m height and then be connected to the pressure guiding pipeline connected to the instrument cabinet. As shown in (4) of Fig. 5, in the case of measuring compressed air, the general pipelines are all laid along the ground, so it can be directly welded to the pressure guiding pipeline and the instrument cabinet pressure guiding pipe. As shown in (2) of Fig. 5, it is used in the case of a horizontally-oriented pipeline for measuring hot water above the instrument cabinet. The two condensing tanks should be led out from the lower part of the positive and negative ring chambers, so that the pressure guiding pipes below the two condensing tanks are completely filled with water, and there is no space for collecting gas.
5. Orifice plate flowmeter Platinum thermal resistance installation: Platinum thermal resistance should be installed on the user pipeline before the 10D long measuring pipe section, to face the fluid flow direction at an angle of 60 degrees; the thermal resistance is inserted into the welding seat and tightened The top of the thermal resistor is at the center line of the pipe; the thermal resistance seat is welded to the customer line by electric welding; the platinum thermal resistance is tightened after the gasket is added, and there is no leakage. Platinum RTDs for small diameters can also be mounted vertically. This article is from:
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