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Balanced flowmeter
Part I : SAMPLE BALANCED FLOWMETER
SP Balance disc balanced flowmeter is the latest generation of the throttle device a porous symmetrical. Computational design by American SUNYSAMPLE company-specific calculation software, a full range of products are used in pipe segment (including clip-on, welding) structure, compared with other (traditional) type flowmeter, its solid structure, the maximum pressure ≤32MPa; high precision, significant energy saving; minimum flow measurements are other types of 1 / 2-1 / 3; straight pipe requirements low, especially in the large-diameter (up to 3000mm) process piping installation favorable; Yantai countries more steam flow station (state authority ) and industry leading products, Dr. Tianjin University accuracy test sector as technical support to ensure that was quickly extended to the petroleum, chemical, metallurgy, electricity, medicine. Glass, automobile manufacturing, paper and a variety of industrial products are fine in each
 
I. Summary
SP balanced differential pressure flowmeter is disc throttle and rectifier component manufactured by Sunysample Automation Equipment Company.
Operating principle
Size and distribution of the SP balance each aperture flow throttling device is based on a unique balance formula, a large number of simulation calculations and a full range of real flow test data stereotypes, it is known as a function of the hole (Function Hoie) when the fluid flow stream plates holidays when the function is well, the fluid will be balance adjustment, the eddy current is minimized, to form a uniform flow field. After taking the differential pressure device to obtain a stable signal, and with the support of the secondary conversion device (differential pressure, pressure transmitters and thermometers), and flow totalizer form a complete flow meter system.
Calculation formula of SP balanced flowmeter:

Quality measurement Volume measurement
QV:volumetric flow (m3/h) Qm: mass flow rate (t/h) ΔP --- output differential pressure (kpa)
K---flow calibration coefficient ρ --- liquid density --- Open hole ratio
d--- Open hole caliber C --- discharge coefficient ε--- discharge coefficient
When the fluid throttle plates close to equilibrium, at its front portion to produce a uniform pressure H, when the balance of the fluid through the throttle plates, throttle plate at the rear end to form a stable low pressure zone, the pressure is L, H and L are by when the guide tube connected to a differential pressure transmitters, flow changes, differential pressure flowmeter between the two taps will be a corresponding increase or decrease. The square root of the differential pressure before and after the flow rate of fluid flowing through the orifice plate to produce a linear relationship, i.e. the sealing conduit Bernoulli's principle equation of energy conversion.
SP balanced flow sensor cloud field
Measured medium velocity field inside the pipe, turbulent kinetic energy field, vorticity field is an important physical flow field. SP each balance flowmeters are fitting characteristics of each particular flow field to well-designed, produced the most suitable products.
II. Excellent performance
Sunysample Automation Equipment Company is the unique brand and technology authorized unit of SUNY SAMPLE.
Sunysample Automation Equipment Company has established a set of standard water flow rate test device and a set of standard sonic nozzle air volume test device.
Sunysample Automation Equipment Company has signed long-term product accuracy verification agreement with Yantai National Steam Flowrate Station.

High repeatability and long-term stability

SP balanced flow meter can flow field rectifier, so that the flow field balance and stability, so that repetitive greatly improved, up 0.1 percent.
SP balance porous symmetrical dispersion flowmeters taken by force, no acute wear, ß value of its long-term remains unchanged, long-term stability is very good; entire instrument with no moving parts, is 5-10 times longer life than conventional throttling device.

Low requirement on straight pipe section

Flowmeter can be rectified by SP balance the flow field, the flow field of balance and stability, and the pressure recovery twice as fast as plates, greatly reducing the requirement for straight pipe, under normal circumstances for the 0.5D-2D, as shown. SP balance using straight pipe flowmeter can save a lot, especially expensive special piping materials.
Range than the width
According to the American SUNY SAMPLE automation equipment company research, test results show: Reynolds numbers greater than 5 * 104, select the appropriate aperture ratio, SP balanced flow sensor measuring range ratio is large enough. According to the actual needs of the industrial measurement, routine measurement range ratio of 10: 1, special occasions measuring range of up to 20: 1 or greater.
Dirt-resistant easy to block
SP balanced flowmeter due to multiple Kong Pingheng symmetrical design reduces the formation of vortex shear and turbulence, thereby greatly reducing the formation of dead zone residence ensure smooth dirty media through a plurality of apertures, holes are blocked to reduce the possibility of fluid .

Bidirectional flow measurement

About the structure of SP balance flowmeter can be completely symmetrical design, guided by the guide pressure pipe pressure connection in the form of treatment, or the use of a negative pressure can be measured differential pressure transmitters, through totalizer or DCS (or PLC) were segmented detection calculation, can be very convenient to measure bi-directional flow.

Perpetual low loss of pressure

SP porous balanced flowmeter designed symmetrically balanced, reducing the formation of vortices and turbulence of friction, reducing the kinetic energy loss, measured under the same conditions does not reduce the differential pressure value, than the conventional apparatus is reduced to a throttling permanent pressure loss / 2-1 / 3, thus saving a considerable operating costs, is an energy saving instrument.

III. Features of high-Precision energy-saving SP balanced flowmeter
Energy conservation:

SP balanced ratio of precision flow measurement and control of various materials and export the device, will significantly enhance the entire production of the material balance ratio, increase yield and reduce waste and pollution emissions, energy consumption will naturally decrease. Because in industrial projects, the integrated yield just 1% of the entire project, it is thousands or millions of economic benefits. The flowmeter in which actual measurement plays a very important role. For example: a power industry, industrial water measurement error of 1.5%, the measurement error of the year: 1.5% x24 hours x365 days x2000T / Hx2 yuan / T = 525600 dollars (about 530,000 yuan). 1.5% of the errors are not a large proportion, but the long-term 1.5% leakage meter, wrong meter or meter, it is not a small number, if an enterprise meter common errors, then give companies a huge waste.
SP balanced by the factory real flow meter calibration, the sensor accuracy of 0.3%, 0.5%, if accompanied by multivariable transmitter, the whole accuracy up to 0.5% (liquid, gas), 1% (gas), while its conventional measuring range ratio of 10: 1, the special conditions of up to 20: 1;
Solve the problem of gas effusion:
When compressed air is used to measure the gas flow rate, the orifice plate is as often water, affect the measurement accuracy. Conventional solution is to orifice throttling device installed in a vertical process piping, or that while the use of plug-meter with a round orifice or loss of low flow.
SP balance its own structural characteristics of porous flow meter that can fundamentally solve the problem before cutting pieces of water, but because of the inherent characteristics, no special or particular treatment does not cause any uncertainty on the accuracy of the measurement.
Solve the problem of liquid containing impurities:
When the fluid in the high impurity content, the solid standard throttling means easy because the deposition of wear and misalignment of the acute angle. And the balance of the meter due to its own SP porous (chamfer) of the structural features, the deposition of solids can be solved; cutting its right angle or chamfer (not acute) characteristics that can solve the acute signs of wear, the better solution liquids containing impurities measuring difficult problem.
Reduce operating costs loss problems:
Flowmeter operating costs include the cost of the measurement accuracy and the medium transport costs. Accuracy trade settlement costs are losses due to inaccurate measurement result, for the purposes of precious media, precision and cost is very important; media delivery cost is the energy consumption of media delivery process, the permanent pressure loss is mainly caused by the measurement components for signs. For the purposes of liquids, gases and steam and other media, operating costs are a lot of expenses (pumps and compressors electricity consumed), it is not easy to ignore, because it is no longer an investment in embodied, but in a dynamic investment in far more than an investment instrument. For example: a measuring orifice DN200mm steam, if the differential pressure is 50KPa, single-table energy consumption of about 20,000 yuan / year; while SP balance meter permanent pressure loss for 10KPa, energy consumption for 7000 yuan / year, 60 to 70 percent relative energy efficiency.
Easily vaporized liquid ammonia and other media measurement:
When ammonia and other easily vaporized media measurement, should avoid two-phase flow. Close to the vapor-liquid equilibrium ammonia and other media, in passing through the orifice, if the pressure loss is too large, it is very easy to cause partial vaporization, affect measurement accuracy. To avoid the time and so easy to vaporize liquid ammonia vaporization media measurement should be used in less pressure loss instrument is critical, while SP balance meter hole design unique functions, a good solution to the class of ammonia and other easily vaporized media measurement issue.

Can solve the problem of fluid collection
Solve the impurity problem of liquid
Reduce operating cost and loss
Performance comparison of SP balanced flowmeter and other flowmeters
1. Lower flow limit
The minimum flow rate requiredof vortex street, nozzle, pore plate flowmeter:
Gas: 6~7m/s; liquid: 0.6~0.7m/s; steam: 6~7m/s;
Requirement on lower flow limit Minimum flow rate under the circumstance of guarantee measurement accuracy (liquid, steam≥0.5 grade, gas≥1.0 grade)
Steam, gas: ≥3.0m/s; liquid: ≥ 0.3m/s
  

3. Main performance

A vortex flowmeter is mainly poor seismic performance, detection probe affected by temperature, as measured medium temperature, the sensitivity decreases, suitable for 300 ° or less, 4MPa following occasions, and poor reproducibility, below velocity limit exists inaccurate measurements, flow fluctuations and other shortcomings.
2) orifice flowmeter deformation during use, welcome stream surface of acute blunt, as time goes on, measure the flow is generally lower than the actual flow rate, turndown ratio of 1: 3, the permanent pressure loss, it is not suitable for metering trade.
3) nozzle meter turndown ratio of 1: 3, not suitable for measuring low flow, lower than 6-7m / s gas / vapor when the flow rate, flow coefficient varies greatly, the error due to the variation in the discharge coefficient caused great nozzle the advantage is that a small pressure loss, power plants typically use a nozzle main steam flow meter majority.
4, the SP equilibrium steam flow meter measurement, the lower limit of the range of the sample medium: superheated steam; Working pressure: 0.8MPa; temperature: 260 degrees for example

  

Model Temperature ℃ Pressure (MPA) Density (kg/m^3) Flow range (t/h) Volumetric flow (m^3/h) FLow velocity range (m/second)
DN50 260 0.8 3.76932 0.079~1.865 21~495 3~70m/s
DN80 260 0.8 3.76932 0.203~4.806 54~1266 3~70m/s
DN100 260 0.8 3.76932 0.316~7.459 84~1979 3~70m/s
DN125 260 0.8 3.76932 0.497~11.728 132~3092 3~70m/s
DN150 260 0.8 3.76932 0.716~15.037 190~4453 3~70m/s
DN200 260 0.8 3.76932 1.277~29.837 339~7916 3~70m/s
DN250 260 0.8 3.76932 1.997~46.62 530~12370 3~70m/s
IV. Comparison of SP balanced flowmeter and other flowmeters
  SP balanced flowmeter Pore plate Nozzle Vortex street Averaging pitot-tube Bituoba Bend V cone wedge-shape
Principle balanced throttle                
Measurement medium gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid gas, steam, liquid
Pipe diameter 15~3000mm 50~3000mm 50~3000mm 25~3000mm 50~3000mm 25~3000mm 50~3000mm 15~3000mm 50~3000mm
Requirement on straight pipe section front 1D rear 1D front 15D rear 10D front 10D rear 5D front 20D rear 10D front 10D rear 5D front 10D rear 5D front 10D rear 5D front 3D rear 1D front 10D rear 5D
Precision range 0.3%-0.1% 1%-2% 1%-2% 1%-1.5% 1%-2% 1%-2% 1%-2% 0.5%-1% 1%-2%
Long-term stability best worst poor poor middle middle middle good middle
Range ratio >10:1 3:1 3~5.1 10: 1 10: 1 10: 1 10: 1 10: 1 5:1
Loss of pressure 10%~30% differential pressure 60%~90% differential pressure 40%~70% differential pressure   10%~20% differential pressure 5%~10% differential pressure 10%~20% differential pressure 30%~50% differential pressure 60%~90% differential pressure
Dirt resistant and anti-blocking good poor good poor poor good good good good
Two-way measurement can cannot cannot cannot cannot can can cannot can
Reynolds number range 200-10000000 >800 >2000   >8000 >50000 >100000 8000-5000000 >300
High flow rate measurement good poor good good good good good good poor
Low flow rate measurement steam, gas>2m/s
liquid>0.2m/s
steam, gas>7m/s
liquid>0.5m/s
steam, gas>6m/s
liquid>0.5m/s
steam, gas>5m/s
liquid>0.3m/s
steam, gas>7m/s
liquid>0.6m/s
steam, gas>5m/s
liquid>0.5m/s
steam, gas>5m/s
liquid>0.5m/s
steam, gas>5m/s
liquid>0.3m/s
steam, gas>5m/s
liquid>0.3m/s
Volume middle middle middle middle small small middle middle middle
Price middle low middle middle high high middle middle high
Service life very long short middle short middle middle long long long
V Application
SP balanced flowmeter can be used in petroleum, petrochemical, chemical, metallurgy, electricity, heating power, municipal engineering, pharmacy, papermaking, tobacco, aerospace industry and other fields to measure the flow of gas, steam, liquid, etc.
VI. Technical index
Applicable media: gas, steam, liquid, and low temperature liquid LNG, liquid nitrogen, liquid oxygen, liquid argon, liquid alkene, liquid hydrogen, liqid chlorine under various conditions. Precision: standard type: ±1%; trade settlement type: ±0.5%; repeatability: ≤±0.1%; range ratio: 10:1—30:1; diameter of measurement pipe: DN25-DN3000mm; temperature: -196-850℃; pressure: ≤10MPa; β value: 0.25-0.9 maximum measurable flow velocity: liquid≥0.1M/S gas 1M/S; accurate flow velocity: liquid≥0.2M/S gas 3M/S
VII Structure and size of SP balanced flowmeter
Overall dimensions of SP balanced flowmeter:
Pipeline DN
mm
Flat welding flange structural interval size(mm)
Flange standard: JB/T81/HG/T20592
Welded neck flange structural interval size (mm)
Flange standard: JB/T8.1/T82.2/T82.4
PN0.25 PN0.6 PN1.0 PN1.6 PN2.5 PN4.0 PN6.3 PN10.0
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