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Anonymous users2024-02-071.Features & Functions:
Integrated structure, good completeness.
There are no rotating parts that are prone to wear and tear, and there are few repairs.
The pressure loss is small, and its pressure loss only accounts for 2-15% of the differential pressure value, which is its outstanding feature.
The minimum differential pressure can reach 30mmH2O.
The pipe diameter is suitable for a large range, and when the pipe diameter is larger, the plug-in structure is adopted, and its superiority is more prominent.
The accuracy and long-term operation stability are good, with an accuracy of up to 1% and a stability of up to .
The average velocity pipe flowmeter has low requirements for pipe layout, and can be directly installed in the downstream of the 90° elbow where only twice the pipe diameter is used, and can still achieve high accuracy.
On-site indication, remote transmission compatibility, analog and digital signal two-way communication coexistence, convenient system construction and network access.
Open digital platform, multi-purpose serial excuse, fieldbus architecture.
The intelligent transmitter is networked with all HART protocol compliant devices (including system manual programmers, distributed control DCS, etc.) to achieve digital two-way communication, automatic detection and control to facilitate remote diagnosis and adjustment in the field and control room.
2.Main technical parameters:
Caliber: DN50-DN1200 (mm).
Accuracy: 1%fs
Turndown ratio: standard 1:8 1:10
Working Pressure:
Medium temperature: -40 -450
Media viscosity: 30cp (equivalent to heavy oil).
Connection: flange connection or pipe welding or plug-in welding.
Flange standard: DN15-600, HG20618-97, DN650-1000, HG20623-97, DN650-900, HG20618-97
dn15-300,hg20618-97
Intelligent differential pressure transmitter.
Output: or digital signal;
With HART protocol (optional).
Power supply: header: blind watch and digital display table.
The digital display can display the instantaneous and cumulative flow temperature at intervals
Pressure, differential pressure, rolls once per second.
For details, please log in: Liaoyang Instrument Manufacturing**** official website.
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Anonymous users2024-02-061. Use. Average velocity tube (Annubar) flowmeter is a new type of differential pressure flow detection element developed according to the principle of pitot tube velocimetry, which outputs as a differential pressure signal, and is used with instruments and meters to measure differential pressure, which can accurately measure the flow rate of a variety of liquids, gases and steam (superheated steam and saturated steam) in circular pipelines and rectangular pipelines, and gradually replace orifice plates and other detection components with its advantages of high accuracy, small pressure loss and easy installation. It is widely used in industries such as petroleum and metal smelting.
2. Features. 1.The pressure loss is small, the energy loss is low, and the permanent pressure loss of the average velocity tube accounts for only 2 15% of the differential pressure
2.High accuracy and good stability, long-term use accuracy of 1%, stability of ;
3.Long product life: The product is made of 316 or 1CrL8Ni9Ti material, and the fluid measuring surface is abrasion-resistant, and the service life can reach 5 10 years.
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Anonymous users2024-02-05The influence of the pipeline on the flow measurement of the average velocity pipe is very important and cannot be ignored, which is mainly manifested in the following two aspects:
1. The length of the straight pipe section.
The length of the straight pipe before the average velocity pipe must reach 20 30d to ensure that the flow velocity distribution is fully developed turbulent, and only in this way can the flow rate through the entire section be estimated only by measuring the flow rate of a few points. Otherwise, the flow in the pipeline is more complex (the flow velocity distribution is not only asymmetrical to the axis, but also has lateral flow (secondary flow) and vortex, and it is difficult to ensure the accuracy of the measurement by measuring only a few points of flow velocity on the diameter.
2. The inner diameter of the pipe.
The average velocity pipe can only measure the flow rate, and the flow rate must be measured by the cross-section of the pipe (the inner diameter of the round pipe should be measured, and the width and height of the rectangular pipe should be measured). It is also a plug-in instrument, and in practical applications, it is often difficult or not serious to measure the inner diameter.
ISO7145 believes that when the inner diameter cannot be measured, it is allowed to use a soft ruler to measure the circumference of the outer diameter of the pipe and estimate the wall thickness to determine the inner diameter, which of course cannot confirm the influence of corrosion and fouling on the inner wall of the pipeline. How can the accuracy of the inner diameter of the pipe be guaranteed in such a certain way, and it can be seen from the following analysis that the accuracy of the inner diameter of the pipe will become a decisive factor affecting the accuracy of the flow measurement of the average velocity pipe.
3. Estimation of flow accuracy.
If only the main factors are considered, the formula for calculating the average velocity tube can be simplified to:
where qv is the volumetric flow; c. Coefficients depending on the units of each parameter; d is the inner diameter of the pipe; dp is the output differential pressure; x is the density of the fluid. The flow uncertainty derived from is .
From the above, the manufacturer has made unremitting efforts on the shape of the detection rod of the average velocity tube, the position of the measuring point, and they will only affect the size of the output differential pressure dp, and from the formula, it can be seen that the relative error of the inner diameter of the pipe d will have several times the influence of the error of differential pressure dp sdp dp.
In addition, the flow coefficient k in the formula is obtained under the specific conditions of the laboratory even if the manufacturer calibrates it one by one, and the field often does not reach the flow field conditions of the laboratory, so the flow coefficient k provided by the manufacturer will also bring a large error. As early as 20 years ago, and in the resistance parts (elbows, gates......After 2 to 12 days, the average velocity pipe was installed and the experimental test of the system was carried out. The test shows that the deviation of the flow coefficient will reach more than 8% when the straight pipe section is less than 4 5 days.
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