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Jiangsu Hongqi Automation Equipment Co., Ltd
HQLUGB flange clamp type vortex flowmeter
NegotiableUpdate on 06/06
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Overview
Brief introduction: HQ-LUGB flange clamped vortex flowmeter is mainly used for flow measurement of industrial pipeline medium fluids, such as gas, liquid, vapor and other media. Its characteristics are small pressure loss, large range, high accuracy, and almost no pressure loss when measuring volumetric flow rate under working conditions
Product Details
Brief introduction:
HQ-LUGB flange clamped vortex flowmeter is mainly used for flow measurement of industrial pipeline medium fluids, such as gas, liquid, vapor and other media. Its characteristics are small pressure loss, large range, high accuracy, and almost unaffected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring volumetric flow rate under working conditions. No movable mechanical parts, therefore high reliability and low maintenance. The instrument parameters can remain stable for a long time. The flange clamped vortex flowmeter adopts a piezoelectric stress sensor, which has high reliability and can operate within a temperature range of -20 ℃ to+250 ℃. It has both analog standard signals and digital pulse signal outputs, making it easy to use in conjunction with digital systems such as computers. It is a relatively advanced and ideal flow meter.
HQ-LUGB series flange clamped vortex flowmeter
1、 Overview of flange clamped vortex flowmeter
The flange clamped vortex flowmeter is a new type of flowmeter developed based on the Karman vortex principle, which has international advanced level. Due to its advantages that cannot be achieved by other flow meters, it has developed rapidly since the 1970s. According to relevant data, the proportion of flange clamped vortex street flow meters used in developed countries such as Japan, Europe, and America has increased significantly and has been widely used in various fields. It will occupy a leading position in future flow meters and is the most ideal alternative product for orifice flow meters. The flange clamped vortex flowmeter is suitable for measuring the mass flow rate and volume flow rate of superheated steam, saturated steam, compressed air, general gases, water, and liquids.
Our company produces HQ-LUGB flange clamp type vortex flowmeter, which includes remote transmission type, on-site display type, and temperature and pressure automatic compensation type. It can be widely used in chemical, petroleum, metallurgy, light industry, environmental protection, municipal, power and other sectors.
The product has the following characteristics:
1. The structure is simple and sturdy, with no movable parts, high reliability, and very reliable for long-term operation.
2. Easy to install and very convenient to maintain.
3. The detection sensor does not directly contact the measured medium, with stable performance and long lifespan.
4. The measured pulse signal is proportional to the flow rate, with no zero drift and high accuracy.
5. The measurement range is wide, and the range ratio can reach 1:10.
6. Less pressure loss, lower operating costs, and more energy-saving significance.
7. Adopting ultra-low power consumption technology, battery powered operation can last for more than two years.
8. Integrated design of temperature and pressure compensation, displaying both flow value and cumulative flow value, temperature and pressure values without the need for alternating switching.
2、 Structure and working principle of flange clamped vortex flowmeter
Product details of vortex flowmeter
1. The structure of HQ-LUGB flange clamp type vortex flowmeter is shown in (Figure 1):
1. The structure of HQ-LUGB flange clamp type vortex flowmeter is shown in (Figure 1):
2. Working principle
When the medium flows through a triangular cylinder at a certain flow rate, an alternating vortex band is generated at both ends of the triangular cylinder, called the "Karman vortex street" (Figure 2). As a result, pressure pulsations are generated at both ends of the cylinder, causing alternating stress to be generated in the detection body. The piezoelectric element encapsulated in the detection probe generates an alternating charge signal with the same frequency as the vortex under the action of the alternating stress. The amplifier amplifies, filters, and shapes this charge signal into a square wave, which is then sent to the integrator for processing and display. The relationship between the release frequency f of vortices within a certain Reynolds number range (2X104~7x106) and the flow velocity V, as well as the width d of the upstream face of the vortex generator, can be expressed by the following equation: f=Sr.v/d, where Sr is the Strouhal number. In the straight part of the curve with Sr=0.16, as long as the vortex frequency f is measured, the fluid flow velocity can be measured. Thus achieving the purpose of measuring fluid flow rate. (Figure 3)
3、 Technical parameters of flange clamped vortex flowmeter
★ Measurement medium: liquid, gas, superheated/saturated steam
★ Measurement range: Normal working range, Reynolds number is 20000~7000, 000; The possible range for measurement is Reynolds number from 8000 to 7000,
★ Accuracy: a. Liquid,+1.0% of the indicated value;
b. Gas,+1.5% of the indicated value;
c. Steam, with an indication value of 1.5% soil;
★ Repeatability: 1/3 of accuracy;
★ Output signal: a. Three wire voltage ripple low level; High level: greater than 4V: duty cycle 50%
b. Two wire system current 4mA~20mA
c. Three wire system current 4mA~20mA
d. RS-485 communication interface
★ Working power supply: external power supply; +24VDC； Internal power supply 3.6V lithium battery
★ Medium temperature: Ordinary type: -40 ℃~+130 ℃;
High temperature type: -40 ℃~+250 ℃;
Ultra high temperature type: -10 ℃~+350 ℃ optional;
Explosion proof type: -40 ℃~+80 ℃;
★ Working pressure: 2.5MPa (Note: Other pressure levels of flow meters can be provided upon user request, but customization is required)
★ High pressure: 86KPa~106KPa;
★ Shell material: a. Carbon steel; b. Stainless steel (1Cr18Ni9Ti)
★ Specifications (inner diameter of pipeline): 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300
★ Environmental temperature: -30 ℃~+60 ℃
★ Relative temperature: 5%~95%
★ Protection level: IP65
★ Explosion proof type: Explosion proof type; Explosion proof mark: Exd I BT4
★ Flow range under working conditions (unit: m3/h)
See Table 1 (Note: If the user requests a lower lower limit, please inform us by phone and customization is available)
4、 Basic structure and installation dimensions of flange clamped vortex flowmeter
The flowmeter consists of a body, a support column, and an amplifying display device. There are two ways to connect with pipelines, namely flange clamping and flange connection. Figure 2 is a schematic diagram of flange clamping, Figure 3 is a schematic diagram of flange connection, and Tables 1 and 2 have reference dimensions.
Table 2 Reference dimensions for flange mounting (mm)
Table 3 Reference Dimensions for Flange Connections (mm)
Table 2 Reference dimensions for flange mounting (mm)
Table 3 Reference Dimensions for Flange Connections (mm)
5、 Installation of flange clamped vortex flowmeter
Choosing the correct installation point and installing the flow meter correctly are both very important steps. If there are errors in the installation process, it can affect the measurement accuracy, and in severe cases, it can affect the service life of the flow meter and even damage it.
5.1 Requirements for straight pipe sections
The flowmeter has certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the measurement accuracy.
If there is a tapered pipe upstream of the installation point of the flowmeter, there should be an equal diameter straight pipe section of not less than 15D upstream of the flowmeter and an equal diameter straight pipe section of not less than 5D downstream.
If there is a gradually expanding pipe upstream of the flowmeter installation point, there should be an equal diameter straight pipe section of not less than 18D upstream of the flowmeter and an equal diameter straight pipe section of not less than 5D downstream.
If there is a 90 ° elbow or lower joint upstream of the installation point of the flowmeter, there should be an equal diameter straight pipe section of not less than 20D upstream of the flowmeter and an equal diameter straight pipe section of not less than 5D downstream.
If there are two 90 ° elbows on the same plane upstream of the flowmeter installation point, there should be an equal diameter straight pipe section of not less than 25D upstream of the sensor and an equal diameter straight pipe section of not less than 5D downstream. ，
The flow regulating valve or pressure regulating valve should be installed as far downstream as 5D of the flowmeter. If it must be installed upstream of the flowmeter, there should be an equal diameter straight pipe section of not less than 25D upstream and an equal diameter straight pipe section of not less than 5D downstream.
There are piston or plunger pumps, piston or Roots fans, and compressors upstream of the flowmeter. The upstream of the flowmeter should have an equal diameter straight pipe section of not less than 25D, and the downstream should have an equal diameter straight pipe section of not less than 5D.
Special attention: If a valve is installed near the upstream of the installation point of the flowmeter, constantly opening and closing the valve will greatly affect the service life of the flowmeter and easily cause long-term damage to it. Try to avoid installing flow meters on very long overhead pipelines as much as possible. Over time, the sagging of the flow meter can easily cause seal leakage between the flow meter and the flange. If installation is necessary, pipe fastening devices must be installed at 2D positions upstream and downstream of the flow meter.
5.2 Requirements for piping
The flowmeter has certain requirements for the upstream and downstream straight pipe sections of the installation point, otherwise it will affect the measurement accuracy.
The inner diameter of the upstream and downstream piping of the flowmeter installation point should be the same as the inner diameter of the flowmeter, and it should meet the requirements of the following equation.
0.98DN ≤ D ≤ 1.05DN formula: DN - inner diameter of flow meter
D - Inner diameter of piping
The piping should be concentric with the flow meter The coaxial deviation should not exceed 1.05DN.
The sealing gasket between the flowmeter and the flange cannot protrude into the pipeline, and its inner diameter can be slightly larger than that of the flowmeter
5.3. Requirements for the other party's pipeline
For the convenience of repairing the flowmeter, it is best to install a bypass pipe for the flowmeter. In addition, a bypass pipe must be installed on the pipeline that needs to be cleaned or in the pipeline where the installed flow meter cannot be shut down for maintenance of the flow meter.
5.4 Requirements for pipeline vibration
Flow meters should be installed on pipelines with strong vibration as much as possible. If installation is necessary, vibration reduction measures must be taken. Pipeline fastening devices should be installed at 2D upstream and downstream of the flow meter, and anti vibration pads should be added.
5.5 Requirements for the external environment
Flow meters should be installed in places with large temperature changes and exposed to thermal radiation from equipment. If installation is necessary, insulation and ventilation measures must be taken. Flow meters should not be installed in environments containing corrosive gases. If installation is necessary, ventilation measures must be taken.
The flowmeter is best installed indoors. If it must be installed outdoors, moisture-proof and sun protection measures must be taken, and attention should be paid to whether water will flow into and out of the cable
Inside the large box, when wiring, bend the cable into a U-shape outside the electrical interface.
There should be ample space around the installation of flow meters, with lighting and power sockets for easy installation, wiring, and regular maintenance. The wiring position of the flowmeter should be kept away from electrical noise, such as power transformers, motors, and power sources.
There should be no radio transceiver near the installation point of the flowmeter, otherwise off frequency noise will interfere with the normal use of the flowmeter.
6、 Selection of flange clamp type vortex flowmeter
The correct selection of instruments is the key to their normal application. In practical applications, most faults are caused by unreasonable instrument selection. Thoroughly understand the working conditions and medium parameters of the on-site application, select appropriate pressure, temperature, protection, explosion-proof level, material, and structural method to ensure that the instrument can operate in the best possible state.
6.2 The maximum flow rate used by the instrument should be as low as 0.5Qgmax (upper limit flow rate of the instrument) as possible
6.3 The nominal diameter of the instrument shall be selected based on the maximum flow rate under operating conditions. If the measured flow rate is at the standard state (20 ℃, 101.3kPa), it is necessary to convert the operating flow rate and select the appropriate diameter according to Table 1.
(1) The flange clamped vortex flowmeter has been calibrated for flow range according to national standards before leaving the factory. Generally, users do not need to calculate it; When necessary, users can calculate the lower limit value of the medium flow rate under operating conditions according to the following formula.
Qgmin=QgminX
In the formula, under the QGmin operating condition, the lower limit of the supported flow rate is:
QGmin Table 1 shows the minimum flow rate under the reference conditions:
Under the reference conditions of ρ tab, the medium density [liquid (water) ρ tab=1000 (kg/m3), gas (air)] ρ tab=(1.205 (kg/m3), dry saturated vapor ρ tab=2.129 [(kg/m3)]; Density of medium under operating conditions of ρ g (kg/m3).
(2) The calculation of converting the standard state (101.3kPa, 20C) density of gas into the density under operating conditions;
ρ g=pn. [(101.3+Pg)/101.3]. [(273+20)/(273+T)] In the equation: density of the medium under pg operating conditions (kg/m3)
Ρ n: Medium density (kg/m3) under standard conditions (101.3kPa, 20C);
Pg working condition pressure (kPa); Temperature under T condition (℃);
(3) Calculate the operating flow rate (Qg);
a) Calculate the volumetric flow rate under operating conditions from the volumetric flow rate under standard conditions: Qg=Qg (pn/pg)
Qg=Qn.[101 .3/(101. 3+Pg)].[(273+T)/<273+20)]
In the formula: Qg operating condition flow rate (m3/h);
Qn standard flow rate (m3/h);
Density of medium under operating conditions of ρ g (kg/m3)
Density of the medium under standard conditions of ρ n (kg/m3); Pg working condition pressure (kPa);
Temperature under T condition (℃)
b) Calculate the flow rate (Qg) of the operating condition based on the mass flow rate;
Qg=Qm/g
In the formula: Qg operating condition flow rate (m3/h);
Qm mass flow rate (m3/h);
Density of the medium under operating conditions of ρ g (kg/m3);
(4) When measuring liquids, in order to prevent gas pockets and cavitation, the actual working pressure inside the pipeline should meet the requirements of the following equation;
P≥2.7△P+1.3P1
In the formula: the maximum allowable pipeline pressure for P (excellent pressure MPa);
△ P pressure loss (MPa);
P1 The corresponding saturated vapor pressure at the working temperature of the liquid (MPa excellent pressure);
△ P can be calculated by the following formula: △ P=1.079X 106p.v2
In the formula: p is the density of the measured liquid (kg/m3);
The flow velocity of the tested liquid (m/s);
Note: Gas refers to air at room temperature and pressure (t=20C, P=0. IMPa); Steam refers to dry saturated steam (t=143C, P=0.4MPa)
7、 Ordering instructions for flange clamp type vortex flowmeter
1. When ordering this product, users should pay attention to selecting appropriate specifications based on the nominal diameter of the pipeline, flow range, nominal pressure, maximum pressure of the medium, temperature range of the medium, and environmental conditions. Explosion proof grade requirements must be indicated for use in hazardous areas.
2. Flow meters are generally of the basic type with pulse output for operating conditions. If other accessories and output functions are required, please specify them when placing an order. 3. When placing an order, please fill in the following format in detail and correctly.
HQ-LUGB/E series vortex flowmeter selection table
