Installation steps and description of the Selba flowmeter The main purpose of the Sylvan flowmeter is very wide. It can measure any gas and liquid, and has very good accuracy and stability, especially it can be repeated. Measurements further improve the accuracy of the measurement. The Selba flowmeter is a measuring tool that is very convenient to install and is not easily damaged. These characteristics are one of the reasons that many people like it, and its use in the industrial field* is extensive.
Although there are a lot of people, the steps of using the Selba flowmeter are not very clear. The following is a brief introduction to some of the steps involved.
First, before using the Selba flowmeter, be sure to determine the specific location and installation requirements of the installation. Only when you have a good understanding can you ensure the quickness and use of the installation;
Second, the step of drilling is very important. When measuring with a flowmeter, it is necessary to drill the object to be measured. The position of the hole is different, and the objects to be measured are different.
The third step is to weld the Selba flowmeter to the welding object. After installing the flowmeter to a fixed position, the horizontal position can be well measured, but some small debris must not be prevented from flowing before welding. Inside the flowmeter, it will cause damage to the flowmeter.
The installation of the Selba flowmeter should be based on the positioning of the flowmeter, the flow direction of the liquid, the length of the upstream and downstream visual segments, the diameter of the piping, the environmental impact (temperature, electromagnetic radiation, corrosion), vibration, valve installation. , pipeline support and other factors. Generally, the flow diameter and the pipe diameter are consistent and concentric. The length of the upstream straight pipe section usually depends on the upstream resistance parts (contraction pipe, expansion pipe, elbow, valve). Generally, the length of the upstream straight pipe section should be 20D and the downstream 5D (where D is Pipe diameter). When the upstream resistance member is a valve or a shut-off valve, it must be ensured that the length of the upstream straight pipe section is not less than 40D. The installation of the flowmeter should avoid high temperature, corrosion, electromagnetic radiation, and vibration sources. When the vibration is strong, support should be considered to reduce the amplitude. When the Selba flowmeter is used for control loop measurement, it is recommended to install the flowmeter downstream of the regulator valve.
Typically, to avoid vibration or some unpredictable cause, a choke, expansion section or tank is installed upstream of the flow meter to partially absorb the vibration and shock of the fluid, which is especially important in the control loop. If the vibration in a certain direction is predicted, the speedometer should be prevented from being installed in the direction where the vortex lift direction is consistent with the vibration direction.
When the Sylvan flowmeter is installed in a horizontal pipe, the ultrasonic probe should be placed in the middle of the horizontal pipe (ie, the vortex generator is in the vertical position). This is because the bubbles tend to accumulate above the pipe, and large foreign objects flow along the bottom of the pipe. They will all hinder the passage of the ultrasonic waves. Installation in the above manner effectively avoids the above phenomenon and brings benefits to the measurement.
Ensuring that the inner diameter of the pipe is the same as the diameter of the flowmeter is the basic requirement for the manufacturer to use the flowmeter. However, in actual use, it is indicated that due to the different standards of flowmeters of foreign manufacturers, the standard inner diameter of the pipeline and the inner diameter of China's national standard pipeline are different under the same nominal diameter. In addition, when the engineering diameter is the same, the wall thickness of the pipe is different because the pressure level requirements are different. Users often overlook the problem of pipe matching when selecting and installing a speed meter, and thus easily cause additional errors.
Features and uses of the Selba flowmeter The Sylvan flowmeter is an ideal product to replace the orifice plate because of its simple installation, low pressure loss, high strength, no wear and no leakage. The Selba flowmeter can be widely used in industrial and mining enterprises to measure the flow of blast furnace gas, compressed air, steam and other liquids and gases.
1. The unique internal secondary average structure provides high precision (±1% reading) and high repeatability (±0.1%).
2. The outer impact tube is made of a single piece of material and is processed without welding. Compared with the similar products welded by the double body structure, it has natural strength and is also convenient to use high temperature and corrosion resistant materials.
a, honeycomb hexagonal stable structure, resulting in a unique beam distribution shape, to ensure the stability of the low-voltage signal, resulting in higher differential pressure than similar products, increasing the range ratio.
b. Suitable for square or rectangular pipes.
c. For the unavoidable clogging problem of similar products in measuring dirty media, there are online pull-out type or manual and automatic purging schemes and devices to achieve non-stop production maintenance.
d, average speed tube + three valve group + temperature and pressure compensation + transmitter, form an integrated structure, easy to use.
e, no flow coefficient drift, long-term stability.
f, exclusive to provide intuitive resonance check to ensure long-term stable operation.
g, low pressure loss and low energy consumption, significant energy-saving effect. The output of the speed meter is a differential pressure signal. It can be used together with the instrument for measuring differential pressure. It can accurately measure various liquids and gases in the He-shaped pipeline and the rectangular pipeline. And steam (superheated steam and saturated steam). The size of the pipe to be tested ranges from 20MM to 3000MM. Annuba has been successfully used in the chemical industry (including nuclear industry) chemical industry, petrochemical industry and metal smelting industry. It is suitable for:
1. Gas delivery and liquid delivery;
2. Energy research, steam boiler heat rate, pump efficiency, gas compressor efficiency and fuel consumption;
3, process control: input and output, ratio, balance; cooling water or air, steam heating;
4. Feeding in the chemical industry.
First, determine the correct installation direction of the Selba flowmeter and the requirements of the straight pipe section.
Second, drilling holes in the pipeline If acetylene gas or other ablation method is used to open the hole, the maximum flow error after installation can reach 10%.
1. Relieve the pipeline and drain the accumulated liquid
2. Select the position of the drill hole (1) For the vertical pipeline, you can open the hole at any position in the circumferential direction.
(2) For horizontal pipelines, the location of the openings is based on the application of the Annubar flowmeter to measure fluids.
(3) Measuring liquid: opening a hole at the bottom of the pipeline.
(4) Measuring gas: opening a hole at the top of the pipeline.
(5) Measuring steam: Open a hole at the bottom of the line.
3. Determine the size of the opening.
4. After opening the hole, remove the burr inside the hole.
5. If it is necessary to install the opposite support, drill a second hole in the opposite direction of the first opening and then remove the burr inside the hole.
Third, the welded joints are welded to the pipeline
1. Assemble the Selba flowmeter and the welded joints provided by Jiangsu Xiu Ming Automation Instrumentation, and insert it into the drilled hole.
2. Position the plane on the mounting head of the Sylvan flowmeter to make it parallel to the ground.
3. Spot welding, fix the welded joint to the pipeline, and then remove the Selba sensor.
4. Before welding, to prevent the weld slag from damaging the joint thread, wrap the threaded part with thick aluminum foil or screw a protective nut.
Fourth, insert and install the speed meter flowmeter
1. After the mounting connector is completely cooled, install the connector.
2. Install the first seal ring between the seal compression ring and the pre-welded lock ring, taking care not to damage the seal ring.
3. Press the seal ring into the interior of the connector to the pre-weld lock ring. Repeat the above steps to load the remaining two seal rings and adjust the position of the seal ring opening so that the position of each opening is staggered to 180 degrees.
4. Adjust the direction of the Sylba, point the arrow mark on the head of the Sylba to the direction of the fluid in the pipeline, and tighten it with the connecting body.
5. Tighten the Pak-Lok nut with a wrench. The wrench is rotated 90 degrees each time until the compression nut rotates 360 degrees.
6. The rotation of the compression nut should not exceed 1-1/4 turns during the installation of the sensor.
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