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Long diameter nozzle flowmeter with standard structure
Overview of nozzle flowmeter
Nozzle flowmeter is also called standard nozzle flowmeter, standard nozzle, ISA1932 nozzle, and standard orifice plate, venturi tube flowmeter, and venturi nozzle belong to the standard throttling device specified by the standard. It conforms to the national standard GB/2624-1993, so there is no need for real-flow calibration like the standard orifice plate, as long as the design and processing according to the national standard can achieve the design accuracy, but the premise also requires the user to be able to provide more accurately: common flow, medium, work The five parameters of temperature, working pressure, inner and outer diameter of the process tube.
2. Measuring principle of nozzle flowmeter
The measuring principle of the nozzle is based on the throttling principle of fluid mechanics. When the fluid in the pipeline is filled with the fluid flowing through the nozzle in the pipeline, the flow rate will be locally contracted in the nozzle, which will increase the flow rate and reduce the static pressure, so it will be generated before and after the nozzle. The pressure drop or pressure difference, the greater the flow of the medium, the greater the pressure difference generated before and after the nozzle, so the size of the fluid flow can be measured by measuring the pressure difference.
Because the nozzle adopts the arc-shaped contour structure, its pressure loss is small, the straight pipe section required is short, and the accuracy is high.
Flow calculation formula:
In the formula: ,--respectively the mass flow rate (/s) and volume flow rate (m3/s);
⇒Outflow coefficient;
⇒Expansibility coefficient;
⇒The diameter of the throttle opening, m;
⇒Diameter ratio,
⇒pipe inner diameter, m;
⇒The density of the measured fluid, /m;
⇒Differential pressure, Pa;
3. Features of nozzle flowmeter
1. Simple structure and easy installation.
2. The pressure loss of the nozzle is smaller than that of the orifice plate, and the length of the straight pipe is also required to be shorter.
3. No need for real-flow verification, stable performance.
4. Can withstand high temperature and pressure, and impact resistance.
5. The corrosion resistance is better than the orifice plate, and the service life is longer.
6. High precision, good repeatability, stable outflow coefficient.
7. The arc-shaped structure design can measure various liquids, gases, steam and various dirty media.
8. Integral forging processing technology, high cost.
4. Classification of nozzle flow meters
(1) Standard nozzle (ISA1932 nozzle)
•Applicable medium; especially suitable for high temperature and high pressure steam and water, and can also be used for various gases and liquids
•Nominal diameter: DN50-500mm (DN>500 can also be designed and produced)
•Working pressure: <=42MPa
•Working temperature: -50ºC - 650ºC
•Take pressure method: corner connection (separate ring chamber, flange ring chamber integrated or direct drilling) to take pressure
•Nozzle installation method: flange (direct drilling and pressing parts), fastener clamping type
Flange, ring chamber, fastener clamp type
Clamping part (and pressing part) welding type
•Executive standard: IS05167; GB/T2624
•Accuracy: Meet the standard: ±1.0%
•Material: Flange or clamping parts: Carbon steel, alloy steel, stainless steel, etc. can be selected according to the temperature of the medium
nozzle: stainless steel 304; 316 etc.
(2) Long diameter nozzle
•Applicable medium; suitable for high temperature and high pressure steam and water, and can also be used for various gases and liquids
•Nominal diameter: DN50-600mm
•Working pressure: <=42MPa
•Working temperature: -50ºC-650ºC
•Pressing method: Diameter (D-D/2) pressure
•Nozzle installation method: equipped with and welded upstream and downstream pipe sections and then set pressure holes according to the diameter (D-D/2)•
•Executive standard: IS05167; GB/T2624
•Accuracy: Meet the standard: ±2.0%
•Material: Carbon steel, alloy steel, stainless steel, etc. can be selected for the upstream and downstream pipe sections according to the temperature of the medium
nozzle; stainless steel 304; 316 etc.
5. Main technical parameters
1. Nominal diameter: 19.99mm≤DN≤630mm
2. Nominal pressure: PN≤32Mpa
3. Working temperature: -50ºC≤t≤550ºC
4. Reynolds number range: 0.30≤β≤0.441, 70000≤ReD≤107
When 0.44≤β≤0.8, 20000≤ReD≤107
5. Throat diameter ratio: 0.30≤β≤0.80
6. Accuracy: 0.5 grade, 1.0 grade, 1.5 grade, 2.0 grade
7. Reference standard: GB/T2624-2006, JJG640-94
8. Connection method: flange connection, welding
6. The structure of the nozzle flowmeter
• The standard nozzle is composed of the entrance plane part A perpendicular to the axis, the entrance constriction formed by the arc-shaped curved surfaces B and C, the cylindrical throat E and the protective groove F required to prevent edge damage. The pressure is taken The upstream pressure-taking port adopts a corner joint to take pressure, and the downstream pressure-taking port can be set according to the corner joint to take pressure, or it can be set far downstream. Total length of nozzle
•When 0.30≤β≤2/3, the nozzle length=0.6041d
•When 2/3≤β≤0.80, the nozzle length={0.4041+(0.75/β-0.25/β2-0.5225)0.5}d
•The upstream surface of the ISA 1932 nozzle is a nozzle composed of a plane perpendicular to the axis, a constricted section defined by two arcs whose profile is a circle, a cylindrical throat and a groove. ISA 1932 nozzle has only one method of tapping pressure.
•The upstream surface of the long-diameter nozzle is composed of a plane perpendicular to the axis, a constricted section with a 1/4 elliptical profile, a cylindrical throat, and possible grooves or bevels. There is only one pressure method for long diameter nozzles: D-D/2.
The temperature and pressure compensation vortex flowmeter is mainly used for the flow measurement of industrial pipeline fluids, such as gas, liquid, vapor and other media. It is characterized by small pressure loss, large measuring range, and high accuracy. It is hardly affected by fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow under working conditions. There are no movable mechanical parts , so the reliability is high and the maintenance is small. The instrument parameters can be stable for a long time. This instrument adopts piezoelectric stress sensor, which has high reliability and works in the working temperature range of -10ºC~+300ºC . There are analog standard signals and digital pulse signal output, which is easy to use with digital systems such as computers.
The temperature and pressure compensation type vortex flowmeter as a flowmeter needs to detect the mass flow in the material balance and energy measurement. At this time, the output signal of the flowmeter should monitor the volume flow and fluid density at the same time. The physical properties and components of the fluid still have a direct effect on the flow measurement. Impacted.
The vortex flowmeter is a new type of flowmeter for fluid flow measurement in closed pipelines based on the Karman vortex principle. Because of its good media adaptability, it can directly measure the volume flow of steam, air, gas, water, and liquid without temperature and pressure compensation. Equipped with temperature and pressure sensors, it can measure the volume flow and mass flow under standard conditions, which is throttling. The ideal substitute product of type flowmeter .
The temperature and pressure compensation function is also integrated in the meter body, which can measure the standard volume flow or standard mass flow of the fluid.
Fully intelligent and digital circuit design , which can automatically compensate the density of the measured fluid or volume calculation under standard conditions.
Brand-new digital filtering and correction functions make flow measurement more accurate and reliable.
Battery-powered type can work continuously for more than two years without external power supply .
Brand new dot matrix LCD display of Chinese characters, making it more convenient to use and operate.
In practical applications, the large flow is often far below the upper limit of the instrument. With the change of load, the small flow is often lower than the lower limit of the instrument. The instrument is not working in its normal working period. In order to solve this The problem is that the diameter at the measuring point is usually reduced to increase the flow velocity at the measuring point, and a smaller diameter instrument is used to facilitate the measurement of the instrument. However, this reducing method must have a straight pipe section with a length of 15D or more between the reducing pipe and the instrument. Rectification makes processing and installation inconvenient.
For ease of use, the battery-powered local display type vortex flowmeter adopts micro-power consumption high-tech. It can run for more than two years without interruption when powered by a lithium battery, which saves the procurement and installation costs of cables and display instruments . It can display instantaneous flow, Cumulative flow, etc. The temperature-compensated vortex flowmeter has the characteristics of no moving parts, large measurement range, reliable operation, high measurement accuracy , wide media adaptability, small pressure loss, simple structure, convenient installation and maintenance, and long-distance signal transmission. It is convenient. It can be used for the process measurement and energy saving management of various liquids, gases, steam and other single-phase fluids in petrochemical, metallurgy, textile, medicine, machinery, water supply, heating, thermoelectric, scientific research and other industries. Value and praise.
Measuring medium: gas, liquid, steam
Installation methods can be divided into: clamp, flange connection, clamp, thread, etc.
Flow measurement range The normal measurement range of flow velocity is Reynolds number 1.5×104~4×106;
Gas 5~50m/s; Liquid 0.5~7m/s
The temperature of the measured medium: normal temperature -25ºC~100ºC
High temperature -25ºC~150ºC -15ºC~300ºC
Accuracy grade : 1.0, 1.5
Turndown ratio: 8:1 12:1 30:1
Output signal pulse voltage output signal
The pulse duty cycle is about 50%, and the transmission distance is 100m
Pulse current remote transmission signal 4~20 mA, transmission distance is 1000m
Environmental temperature of the instrument: -25ºC~+55ºC Humidity: 5~90% RH50ºC
Material stainless steel, aluminum alloy
Power supply DC24V or lithium battery 3.6V
Explosion-proof grade : ia II CT1-CT6
Protection grade IP67
Detection amplifier circuit : interchangeable with different calibers and different media
What are the raw materials used?
The main materials used in world-renowned electrical components. We can also make any custom design for you according to your needs.
How long does it usually take for me to receive the equipment?
Depends on whether you want to do customization your abrasive or not, and also depends on the speed of customs clearance and logistics, but we can guarantee to ship regular abrasive machine in less than 30 business days.
Any benefits for abrasive machine from China?
In a word, China has a much better industry chain. There may be manufacturers of abrasive and packaging in India, Vietnam and Malaysia, but HG-Abrasive can guarantee that our prices can be on par with theirs and our quality, service far exceeds your expectations.
When can I get an engineer from you?
Contact our sales staff when you have completed the preparation conditions (water, electricity, air supply, production materials). We will send an engineer to install your machine and train your staff to use it. Usually, when you are ready, you can contact our sales staff and cooperate with us to get a visa for the engineer, who will arrive within 15 days.
What about the details of the packaging?
To ensure the integrity and safety of product packaging, main products are packed in plastic film or export plywood boxes, and auxiliary products are packed in thick cartons.
Do you provide customized service?
We can design the machine according to your requirements (material, power, size, etc.). We will also provide you with expert guidance at the same time, based on our many years of experience in the industry.
How will my machine be installed once it arrives? How much does it cost?
We'll dispatch an engineer to your facility to assess the situation, install the machine and train your staff on how to operate it. The customer pays for round trip airfare, accommodation and USD100/day/person.
Are you a manufacturing or a trading company?
We are a factory, and we offer factory direct prices with excellent quality and worry-free service. Please come and see us here!
What is your guarantee or warranty if we buy your machine?
We offer you a 1-5 years warranty on our high-quality machines and lifetime technical support.
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