U.S. TUUMU Automation Controls Inc. TUUMU U.S. TUUMU ...
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q= △ / v 1 2 ε d 2 P ρ π 4 C 1 -β 4 q= m q v ρ U.S. TUUMU Automation Controls Inc. TUUMU U.S. TUUMU Automation Controls Inc. TUUMU Balance Flow Meter LMK800 Series Overview The balance (orifice plate with a plurality of holes) is the third-generation throttling device and is a revolutionary differential pressure type flow instrument. The flow noise of the balance flow meter is reduced to 1/15, the permanent pressure loss is about 1/3, the pressure can be recovered, and the minimum straight pipe section can be smaller than 0.5 D; it is provided with no mobile parts, being very simple in installation and application, convenient to use and install, capable of saving large straight pipe sections and largely reducing the power consumption needed during fluid operation and being the throttling instrument with wide application prospect. Measurement Range The balance flow sensor is a disc throttling rectifier with a plurality of holes and is installed on the cross section of the pipeline. The size and location of each hole are customized based on the unique formula and measured data and the holes are called as the function holes. When the fluid passes the function holes of the disc, the fluid is balanced and adjusted, the vortex is minimized and the almost ideal gas is formed. The stable differential pressure signal can be obtained through the normal pressure measurement device. The volume flow and the mass flow are calculated according to the Bernoulli equation. Most standard throttling devices used currently have large permanent pressure loss due to the facts that only one hole is provided and many vortexes are formed in the dead corners at both sides of the holes to consume the kinetic energy of the fluid; the noises formed by the random and disordered vortexes cause the fluctuation of the pressure measurement point and the measurement linearity and repeatability are reduced; a quite long direct pipe section is needed for the one-hole structure to clear up and recover the pressure. A large quantity of vortexes and kinetic energy loss occur in the standard throttling device. The balance flow sensor throttle the rectifier is capable of ingeniously achieving the balance measurement of the fluid and obviously reduce the formation of the vortexes, the dead corner effect, the kinetic energy loss of the fluid and fluctuation of the signal of the pressure measurement point caused by the vortexes through the disc with the plurality of holes. The balance flow meter is capable of measuring the pressure, the differential pressure, the temperature and the flow of the liquid, the air or the steam. Flow Equation: Wherein: qm stands for the mass flow (kg/s); qv stands for the volume flow (m3/s); C stands for the discharge coefficient; E stands for the inflatable coefficient; β stands for the diameter ratio, β equals d/D; d stands for the diameter of the throttling part, m; �1 stands for the fluid density, kg/m3; ∆P stands for the differential pressure, Pa: Main Characteristics of the Balance Flow Meter ●Requirement for short straight pipe section The balance flow meter is capable of balancing and stably adjusting the flow field, and the pressure recover is 2 times quicker than that of the traditional throttling device and the requirement for the straight pipe section is largely reduced. Generally, the front straight pipe section is 3D and the back straight pipe section is 1D, with the minimum of less than 0.5D. Therefore, a large part of straight pipe section can be saved, especially for the pipeline made of specially expensive materials. The straight pipe section of the orifice plate is required to be quite long. ● High measurement precision Due to the fact that the balance flow meter is characterized by the structure of a plurality of holes, the balance flow meter is capable of balancing the flow filed, reducing the vortexes, vibration and signal noise and improving the stability of the flow field; the special precise pipeline and the special pressure measurement device are adopted by the body and therefore the linearity is improved by 5-10 times compared with that of the traditional throttling device. According to the actual calibration, the precision of the sensor can reach ± 0.3% and ± 0.5% and the sensor is suitable for the occasion for trade calculation; With the physical dimension test, the precision of the sensor can reach ± 0.5% and± 1.0% and the sensor is suitable for the occasion of process control. The processing repeatability of the balance flow meter is quite high and similar to the traditional throttling device, being capable of achieving the verification of the physical dimension on the basis of actual flow calibration data. ● Less permanent pressure loss The balance structure of a plurality of holes of the balance flow meter reduces the formation of the vortexes and the turbulence friction, reduces the kinetic energy loss and reduces the permanent energy loss by 2.5 times compared with the traditional throttling device under the condition that the differential pressure of the same measurement operation condition is not reduced and therefore the meter is an energy-saving instrument which saves large amount of operation kinetic energy cost and is worth being promoted. ● Wide range ratio Compared with the traditional throttling device, the balance flow meter is capable of largely increasing the measurement range ratio. It is showed by the research result that when the Reynolds number is larger than 5000, the range ratio of the balance flow sensor has no upper limit with the proper aperture parameter selected. According to the actual application in the industrial measurement, the normal measurement range ratio is 10:1 and can reach 30:1, 50:1 or higher with proper parameters selected. ● Good repeatability and long-term stability The balance flow sensor is capable of stabilizing the flow field and enables the repeatability to be largely improved and reach 0.1%. The plurality of circulation holes of the balance flow meter burden the force in a decentralization mode, acute angle abrasion does not occur, the p value is maintained the same in the long run, so the long-term stability is quite good; the meter is not provided with movable parts and the service life is prolonged by 5-10 times compared with that of the traditional throttling device. Standard throttling device Percentage of the maximum pressure difference Percentage of the maximum pressure difference Balance flow sensor page 1 www.tuumu.com www.tuumu.com page 2
Transcript of U.S. TUUMU Automation Controls Inc. TUUMU U.S. TUUMU ...
q = △ / v 12 ε d 2 P ρ
π4
C
1 -β 4q =m q vρ
U.S. TUUMU Automation Controls Inc. TUUMU U.S. TUUMU Automation Controls Inc. TUUMU
Balance Flow Meter LMK800 Series
Overview
The balance (orifice plate with a plurality of holes) is the third-generation throttling device and is a revolutionary differential pressure type flow instrument. The flow noise of the balance flow meter is reduced to 1/15, the permanent pressure loss is about 1/3, the pressure can be recovered, and the minimum straight pipe section can be smaller than 0.5 D; it is provided with no mobile parts, being very simple in installation and application, convenient to use and install, capable of saving large straight pipe sections and largely reducing the power consumption needed during fluid operation and being the throttling instrument with wide application prospect.
Measurement Range
The balance flow sensor is a disc throttling rectifier with a plurality of holes and is installed on the cross section of the pipeline. The size and location of each hole are customized based on the unique formula and measured data and the holes are called as the function holes. When the fluid passes the function holes of the disc, the fluid is balanced and adjusted, the vortex is minimized and the almost ideal gas is formed. The stable differential pressure signal can be obtained through the normal pressure measurement device. The volume flow and the mass flow are calculated according to the Bernoulli equation. Most standard throttling devices used currently have large permanent pressure loss due to the facts that only one hole is provided and many vortexes are formed in the dead corners at both sides of the holes to consume the kinetic energy of the fluid; the noises formed by the random and disordered vortexes cause the fluctuation of the pressure measurement point and the measurement linearity and repeatability are reduced; a quite long direct pipe section is needed for the one-hole structure to clear up and recover the pressure.
A large quantity of vortexes and kinetic energy loss occur in the standard throttling device.
The balance flow sensor throttle the rectifier is capable of ingeniously achieving the balance measurement of the fluid and obviously reduce the formation of the vortexes, the dead corner effect, the kinetic energy loss of the fluid and fluctuation of the signal of the pressure measurement point caused by the vortexes through the disc with the plurality of holes. The balance flow meter is capable of measuring the pressure, the differential pressure, the temperature and the flow of the liquid, the air or the steam.
Flow Equation:
Wherein:
qm stands for the mass flow (kg/s); qv stands for the volume flow (m3/s); C stands for the discharge coefficient; E stands for the inflatable coefficient; β stands for the diameter ratio, β equals d/D; d stands for the diameter of the throttling part, m;�1 stands for the fluid density, kg/m3; ∆P stands for the differential pressure, Pa:
Main Characteristics of the Balance Flow Meter
●Requirement for short straight pipe section The balance flow meter is capable of balancing and stably adjusting the flow field, and the pressure recover is 2 times quicker than that of the traditional throttling device and the requirement for the straight pipe section is largely reduced. Generally, the front straight pipe section is 3D and the back straight pipe section is 1D, with the minimum of less than 0.5D. Therefore, a large part of straight pipe section can be saved, especially for the pipeline made of specially expensive materials.
The straight pipe section of the orifice plate is required to be quite long. ● High measurement precision Due to the fact that the balance flow meter is characterized by the structure of a plurality of holes, the balance flow meter is capable of balancing the flow filed, reducing the vortexes, vibration and signal noise and improving the stability of the flow field; the special precise pipeline and the special pressure measurement device are adopted by the body and therefore the linearity is improved by 5-10 times compared with that of the traditional throttling device. According to the actual calibration, the precision of the sensor can reach ± 0.3% and ± 0.5% and the sensor is suitable for the occasion for trade calculation; With the physical dimension test, the precision of the sensor can reach ± 0.5% and± 1.0% and the sensor is suitable for the occasion of process control. The processing repeatability of the balance flow meter is quite high and similar to the traditional throttling device, being capable of achieving the verification of the physical dimension on the basis of actual flow calibration data. ● Less permanent pressure loss The balance structure of a plurality of holes of the balance flow meter reduces the formation of the vortexes and the turbulence friction, reduces the kinetic energy loss and reduces the permanent energy loss by 2.5 times compared with the traditional throttling device under the condition that the differential pressure of the same measurement operation condition is not reduced and therefore the meter is an energy-saving instrument which saves large amount of operation kinetic energy cost and is worth being promoted.
● Wide range ratio Compared with the traditional throttling device, the balance flow meter is capable of largely increasing the measurement range ratio. It is showed by the research result that when the Reynolds number is larger than 5000, the range ratio of the balance flow sensor has no upper limit with the proper aperture parameter selected. According to the actual application in the industrial measurement, the normal measurement range ratio is 10:1 and can reach 30:1, 50:1 or higher with proper parameters selected.
● Good repeatability and long-term stability The balance flow sensor is capable of stabilizing the flow field and enables the repeatability to be largely improved and reach 0.1%. The plurality of circulation holes of the balance flow meter burden the force in a decentralization mode, acute angle abrasion does not occur, the p value is maintained the same in the long run, so the long-term stability is quite good; the meter is not provided with movable parts and the service life is prolonged by 5-10 times compared with that of the traditional throttling device.
Standard throttling device
Percentage of the maximum pressure difference
Percentage of the maximum pressure difference
Balance flow sensor
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● Wide measurement rangeAccording to the test result, we understand that the performance of the balance flow meter enables its flow rate to reach the velocity of sound; the minimum Reynolds number can be +200 and the maximum Reynolds number is larger than 107; and the β value is between 0.25- 0.90. ● Wide application range The temperature and pressure of the balance flow meter depend on the material quality and the grade of the pipeline and the flange and can respectively reach 850 ℃ and 42Mpa. The flow meter is suitable for the super-low temperature fluid, such as the liquid air, the liquid nitrogen, the liquid oxygen, the liquid argon, the liquid ethylene, the liquid hydrogen, the liquid chlorine and is good in the measurement quality. The balance flow meter can measure the gas-liquid two-phase materials, the sizing materials and even the solid particles. The balance flow meter is completely bilaterally symmetrical and therefore can conveniently measure the bi-directional flow. ● Energy-saving flow meter The energy-saving instruments are needed to build the energy-saving and environment-friendly harmonious society. The balance flow meter is a unique energy-saving differential pressure flow meter. As a measurement element, the flow meter itself is also an energy consumption element. The operation cost of the flow meter includes the measurement precision cost and the media transmitting cost. The measurement precision cost is the trade settlement loss caused by the inaccuracy of the measurement and is quite important for the noble metal media.
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Structural Style and Technical Performance
● Measurable media: liquid, air and steam ● Operating temperature and pressure: depending on the material quality and structure of the pipeline and the flange and capable of respectively reaching 800 ℃ and 40MPa. ● Measurement range: without upper limit, quite wide, and normally depending on the differential pressure device. Normally, 10:1. ● Measurement precision: be capable of reaching Grade 0.3, 0.5, 1 and 1.5 depending on the measurement range. ● Repeatability: ± 0.1%.● Drift diameter: 20-2500 mm.
LMK 800-A flange connection type (double flanges for pressure measurement) Applicable media: viscous liquid, dirty gas
LMK 800-D flange clamp installation type (flange and direct pressure measurement) Applicable media: liquid, gas and steam
LMK 800-E butt clamp type (hole-punching pressure measurement) Applicable media: liquid, gas and steam Applicable pipeline diameter: DN15-150mm
LMK 800-E butt clamp type (hole-punching pressure measurement) Applicable media: liquid, gas and steam Applicable pipeline diameter: DN15-150mm
LMK 800-E butt clamp type (hole-punching pressure measurement) Applicable media: liquid, gas and steam Applicable pipeline diameter: DN15-150mm
LMK 800-B flange connection type (welding pressure measurement) Applicable media: liquid, gas and steam
LMK 800-C direct welding type (welding and hole-punching pressure measurement) Applicable media: liquid, gas and steam
Integrated balance flow meter 1. Constitution The integrated balance flow meter comprises the pressure introducing pipe and the tri-valve set, the differential pressure transmitter (the normal differential pressure transmitter and the multi-variable differential pressure transmitter can be selected as the differential pressure transmitter). 2. Technical indexes Precision: ± 1% Power supply: DC15V-45VTwo-wire system, 4-20mA output (Hart), others refer to the differential pressure transmitter indexes 3. Advantages Advantages when the normal differential pressure transmitter is installed: ● Cost advantage:When the normal differential pressure transmitter is installed, the 4-20mA signal which is in square relation with the flow can be output and then sent to the computer or the flow accumulation calculator to calculate the flow in a radication mode. The cost is saved with fewer switch valves and pipe fittings. No tracing is needed for preventing freezing in the winter. Advantages when the multivariable differential pressure transmitter is installed: When the multivariable differential pressure transmitter is installed, the body can display the instant accumulated flow and can carry out temperature and pressure compensation, flow calculation and the like. And 4-20mA can be output. ● Precision advantages: The real-time full-parameter dynamic numeric compensation technology: the achievement of the temperature compensation is a basic function of the integrated balance flow meter. The normal flow accumulation calculator can also fulfill the function and the difference is that the integrated balance flow meter adopts the real-time output. 4. Schematic diagram of multivariable integrated balance flow meter The full-parameter dynamic numeric compensation is not the mapping type parameter correction of the normal accumulation calculator. ● Function advantages: Due to the adoption of multiple parameters and the Hart communication, the user can measure a plurality of parameters with one flow meter. The integrated balance flow meter installed in the site can be remotely operated through a PC in the control room and can also be adjusted when connected in the manual manipulator in the portable state. In addition, the local button mode of the integrated balance flow meter can enable the user to directly set through the buttons in the site. The integrated balance flow meter integrates the key functions of the flow accumulation calculator and simplifies the compensation calculation function of the DCS or the secondary table. When 4-20mA is used as the transmitting signal, the DCS or the secondary table is only needed to have the accumulation/alarm/recording and power supply functions; and when the Hart is used in the system as the transmitting signals, the second/third and fourth measurement of the transmitter can be continuously traced and monitored. Cost advantages: One integrated balance flow meter is a transmitter which can output flow, pressure, temperature and other parameters and can save the purchase cost.Fewer transmitters, less wiring and fewer switch valves save the installation cost. The transmitter directly outputs the instant or the accumulative flow, the system resources of the flow accumulation calculator is simplified, the connection of DCS is more convenient and the system cost is saved. The procedures can be customized according to the specific demand, the added value of the software can be increased, the secondary table is not needed to be purchased and the hardware cost is saved.
Temperature and static pressure
compensation
A/D signal switch
A/D signal switch
Flow meter
Excitation and amplification EEPROM linear
constant Measurement range
constantTransmitter
configuration
Microprocessor● Compensation and linearity ● Measurement range ● Transmitting function ● Damping • diagnosis
5. Technical indexes of the multivariable transmitter ● Power supply scope: DC15V- 45V●OutputOutput signal: two-wire system is 4-20mA (Hart) (the user can select the output absolute pressure, temperature, instant and accumulative flow) Limit of the output signal: 1 min is 3.5mA and is configurable. The standard set is: 1 min of 3.8mA and 1 max of 20.5mA.Alarm current: 1min is 3.5-4mA and is configurable. The standard set is 3.6mA, 1 max is 20-22.5mA and is configurable, and the standard set is 21mA. Communication distance: the maximum communication distance of the multi-purpose core twisted pair is 1.5 Km. The communication distance can be different because of the different types of the cables and can be determined with the following formula. ● Cable length: L= (65×106)/(R×C)-(Cf-10000)/CL stands for the length, m or ft;
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R- -阻 抗(包括电源阻抗)Cf- -最 大并联电缆电容pF/m或p F/ftC- -电 缆电容pF/m或p F/ft防爆要求(NEP S I)隔爆许可：ExdIICT6防爆级别：C级T6：允许表面最高温度85℃环境温度：- 40℃- 60℃电气接口：1/2NP T内螺纹
● 防爆密封接头
接线口：1/2NP T适用电缆外径：φ8 .5± 0 .5mm外壳防护
外壳：铸铝，环氧树脂喷涂，丁晴橡胶0型环
防护等级：IP 67温度0~100％RH
结构形式及尺寸
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R stands for the impedance (including the power source impedance); Cf stands for the capacitance of the parallel cables pF/m or pF/ft C stands for the cable capacitance, pF/m or pF/ft. Anti-explosion requirements (NEPSI) NEPSI flameproof permit: Exd II CT6Flameproof grade: Grade C T6: the approvable maximum surface temperature is 85 ℃Ambient temperature: -40 ℃ to 60 ℃Electrical interface: 1/2 NPT internal thread ● Anti-explosion seal jointWiring port: 1/2 NPTApplicable outer diameter of cables: 8.5 ± 0.5 mm Shell protectionShell: cast with aluminum, painted with epoxy resin, nitrile rubber O-shaped ring Protection level: IP 67 Temperature 0-100% RH
Load resistance Range capable of communication BRAIN and HART
Structural Form and Size
1) Flange Connection Type (Flange Pressure Measurement) Nominal diameter
Nominal diameter
Nominal diameter
Nominal diameter
Table I
Table II
Flow direction of the media
Flow direction of the media
(the angle between the two pressure measurement flanges is 90 degrees)
Flow direction of the media
Flow direction of the media
Flow direction of the media
Flow direction of the media
2) Flange Connection Type (Welding Pressure Measurement)
Nominal diameter
3) Butt Clamp Type
4) Direct Welding Type 5) Anti-Corrosion Type
Flow direction of the media is 50。
Flow direction of the media
Flow direction of the media
Flow direction of the media
Flow direction of the media
Flow direction of the media
Flow direction of the media
Structure form of the DN15-DN600 Structure form of the DN700-DN3000
Table III
Table V Table IV.
Flow direction of the media
the thickness is 4mm.
Type Selection
Type Instruction
Structural form Flange connection type (flange pressure measurement) Flange connection type (welding pressure measurement) Directly welding type (welding and hole-punching pressure measu rement) Flange clamp installation type (flange direct pressure measurement) Butt clamp type (hole-punching pressure measurement) Anti-corrosion type Square tube type (flange direct welding and hole-punching press ure measurement)
Measured pipe diameter Stand for 001-54000, for example: DN100mm is shown as 0100
Material The material of the flange and the pipeline is the carbon steel Q235A and the material of the body is the stainless steelThe material of the flange, the pipeline and the body is the alloy steel 10CrMo910The material of the flange, pipeline and body is the stainless steel 1Cr18Ni9Ti or 0Cr18Ni9. The material of the flange, the pipeline and the body is the alloy steel 15CrMo. The material of the flange, the pipeline and the body is the stainless steel 0Cr17Ni12Mo2 (SUS316)The materials of the special measurement pipes are described in the contract
Pressure grade 006-400 stands for the pressure of 0.6Mpa to 40 Mpa, for example: 0.6Mpa is showed as 006
System configurations of the integrated balance flow meterWithout compensation (used in the media of which the density does not change), the normal differential pressure transmitter is provided
Pressure compensation (used for saturated vapor), provided with the multivariable differential pressure transmitterProvided with the temperature sensor (temperature and pressure compensation, gas, superheated steam), provided with the multivariable differential pressure transmitter differential pressure transmitter
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Provided with the temperature sensor (temperature compensation, used for liquid)Taper flow meter body (not provided with the differential pressure transmitter, tri-valve pair) The matching parts provided according to the requirements of the user are described in the contract
Anti-welding grade of the transmitter (not needed to be chosen for those without transmitter) Anti-explosion is not required Intrinsic safety anti-explosion Flameproof
Connection of the transmitters
Directly installed, integrated, tri-valve pair Remotely installed, 1/4 NPT connection
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