A Coriolis mass flow meter measures mass flow rate by detecting changes in the vibration of a tube caused by the acceleration and deceleration of fluid flowing through it. The sensor detects the phase shift between inlet and outlet vibrations, which is proportional to mass flow rate. The meter can also measure fluid density by detecting changes in the tube's natural vibration frequency caused by changes in the combined mass of the tube and fluid. The meter provides a direct mass flow measurement unaffected by variations in fluid density.
this section speaks about the quantity flow meter and its different types i.e. positive displacement flow meter and metering pump, it comprises discussion on mass flow meter, coriolis flow meter, variable reluctance tacho generator and linear resistance element flow meter.
introduction to flow,flow type,laminar,turbulent,one dimensional flow,two dimensional flow,type of flow measurement,flow measuring elements,orifices,nozzles,venturi,pitot tubes,limitations,advantages of the elements,application of elements
Speaks about the different aspects of flow measurement i.e. flow types, fluid types, its units, selection parameters; definition of common terms, coanda effect coriolis effect . it also speaks about the factors affecting flow measurement.
this section speaks about the quantity flow meter and its different types i.e. positive displacement flow meter and metering pump, it comprises discussion on mass flow meter, coriolis flow meter, variable reluctance tacho generator and linear resistance element flow meter.
introduction to flow,flow type,laminar,turbulent,one dimensional flow,two dimensional flow,type of flow measurement,flow measuring elements,orifices,nozzles,venturi,pitot tubes,limitations,advantages of the elements,application of elements
Speaks about the different aspects of flow measurement i.e. flow types, fluid types, its units, selection parameters; definition of common terms, coanda effect coriolis effect . it also speaks about the factors affecting flow measurement.
this article covers discussion of variable area flow meter. also it speaks about turbine flow meter, target flow meter, magnetic flow meter, vortex flow meter, ultrasonic flow meter, thermal flow meter.
1.Ultrasonic Flowmeter is a type of flowmeter that determines the flow velocity of fluid using ultrasonic soundwaves .
2.Ultrasonic Flowmeter works on the principle of Transit Time Difference Method , where we use Ultrasonic Transducers to emit and detect the ultrasonic waves.
Basic Industrial Instruments Used for Flow measurnment.
Working , Construction and diagrams with detailed explanations.
Major type of Instruments are listed.
various types of flow meter
1. rotameter
2. venturimeter
3. electromagnetic flow meter
4. positive displacement flow meter
with their working advantage and disadvantages
it speaks about the differential head flow meters. its different types. their principle of operation, venturi meter, orifice plate, rotameters, it also covers discussion on open channel flow meter. it covers the different application domains of the different types of flow meters and their advantages and disadvantages.
this article covers discussion of variable area flow meter. also it speaks about turbine flow meter, target flow meter, magnetic flow meter, vortex flow meter, ultrasonic flow meter, thermal flow meter.
1.Ultrasonic Flowmeter is a type of flowmeter that determines the flow velocity of fluid using ultrasonic soundwaves .
2.Ultrasonic Flowmeter works on the principle of Transit Time Difference Method , where we use Ultrasonic Transducers to emit and detect the ultrasonic waves.
Basic Industrial Instruments Used for Flow measurnment.
Working , Construction and diagrams with detailed explanations.
Major type of Instruments are listed.
various types of flow meter
1. rotameter
2. venturimeter
3. electromagnetic flow meter
4. positive displacement flow meter
with their working advantage and disadvantages
it speaks about the differential head flow meters. its different types. their principle of operation, venturi meter, orifice plate, rotameters, it also covers discussion on open channel flow meter. it covers the different application domains of the different types of flow meters and their advantages and disadvantages.
Final Presentation to Global Supply Chain Unit at International Paper during an internship in the Global Energy Sourcing division. Presented July, 2010.
In this presentation you know about turbine flow meter and how it works. We are providing business directory of turbine flow meter manufacturers and suppliers.
Accurate flow measurement stands as a linchpin in various industries, governing processes as diverse as oil and gas refinement, food production, pharmaceuticals, and more. The precision of these measurements directly influences product quality, process efficiency, and resource management. As industries continue to demand increasingly accurate and reliable measurements, innovative solutions have emerged to meet these challenges. One such solution that has garnered widespread attention is the Coriolis mass flow meter.
The Coriolis mass flow meter represents a sophisticated breakthrough in flow measurement technology. By harnessing the principle of the Coriolis effect, this device provides unparalleled accuracy in measuring mass flow rates. Unlike traditional methods, it's capable of accurately measuring fluid flow regardless of fluid properties like viscosity or temperature variations. This versatility makes it a staple in industries where precise measurements are non-negotiable.
In this article, we will be delving into the world of Coriolis mass flow meters, exploring their intricate working mechanisms, advantages over conventional methods, and applications across industries. We'll address the factors affecting accuracy and offer insights into proper installation and maintenance practices. Additionally, we'll guide readers through the process of selecting the right Coriolis meter for specific needs and shed light on future trends in this dynamic field.
From its fundamental principles to its cutting-edge advancements,the objective of this article is to provide readers with an all-encompassing grasp of Coriolis mass flow meters, empowering them to make informed decisions and leverage this technology for enhanced operational efficiency and precision.
There are several various alternatives for metering flowrates available in the oil and gas business, particularly in the UAE. Coriolis flow meters have been extremely popular throughout time with skid makers in the oil and gas industry and its different customers in terms of monitoring liquid and gas.
This article provides a brief yet concise idea about flow meters and the pertinent terms related to them. This article classifies the different types of flowmeters and cites the different devices for measurement under these categories. Also, this article speaks about the major five classes of flowmeters viz. differential pressure, velocity, positive displacement, mass, and open channel.
Rotameter calibration report for multiple fluidsSakib Shahriar
We will study Rotameter and calibrate it for various fluids in this report. Mainly, we calibrated the rotameter for water. Calibration means nothing but the relationship between volumetric flow rate vs Rotameter reading.
Basic concept and techniques of Flow measurement are described.
Bernoulli's Principle, Hagen Poiseuille Law, Coanda and Coriolis Effect are described..
Rev. August 2014 ME495 - Pipe Flow Characteristics… Page .docxjoyjonna282
Rev. August 2014 ME495 - Pipe Flow Characteristics… Page 2
2
ME495—Thermo Fluids Laboratory
~~~~~~~~~~~~~~
PIPE FLOW CHARACTERISTICS
AND PRESSURE TRANSDUCER
CALIBRATION
~~~~~~~~~~~~~~
PREPARED BY: GROUP LEADER’S NAME
LAB PARTNERS: NAME
NAME
NAME
TIME/DATE OF EXPERIMENT: TIME , DATE
~~~~~~~~~~~~~~
OBJECTIVE— The objectives of this experiment are
to: a) observe the characteristics of flow in a pipe,
b) evaluate the flow rate in a pipe using velocity
and pressure difference measurements, and c)
perform the calibration of a pressure transducer.
Upon completing this experiment you should have
learned (i) how to measure the flow rate and average
velocity in a pipe using a Pitot tube and/or a resistance
flow meter, and (ii) how to classify the general
characteristics of a pipe flow.
Nomenclature
a = speed of sound, m/s
A = area, m
2
C = discharge coefficient, dimensionless
d = pipe diameter, m
d0 = orifice diameter, m
E = velocity approach factor, dimensionless
f = Darcy friction factor, dimensionless
K0 = flow coefficient, dimensionless
k = ratio of specific heats (cp/cv), dimensionless
L = length of pipe, m
M = Mach number, dimensionless
p = pressure, Pa
p0 = stagnation pressure, Pa
p1, p2 = pressure at two axial locations along a
pipe, Pa
Q = volumetric flow rate, m
3
/s
R = specific gas constant, J·kg/K
Re = Reynolds number, dimensionless
T = temperature, K
V = local velocity, m/s
V = average velocity, m/s
Y = adiabatic expansion factor, dimensionless
= ratio of orifice diameter to pipe diameter,
dimensionless
p = pressure drop across an orifice meter, Pa
= dynamic viscosity, Pa·s
= air density, kg/m3
INTRODUCTION— The flow of a fluid (liquid or
gas) through pipes or ducts is a common part of many
engineering systems. Household applications include
the flow of water in copper pipes, the flow of natural
gas in steel pipes, and the flow of heated air through
metal ducts of rectangular cross-section in a forced-air
furnace system. Industrial applications range from the
flow of liquid plastics in a manufacturing plant, to the
flow of yogurt in a food-processing plant. Because the
purpose of a piping system is to transport a desired
quantity of fluid, it is important to understand the
various methods of measuring the flow rate.
In order to work with a fluid system, and certainly to
design a fluid system that will deliver a prescribed
flow, it is necessary to understand certain fundamental
aspects of the fluid flow. For this, one should be able
to answer questions like: Are compressibility effects
important? Is the flow laminar or turbulent? Is the
viscosity of the fluid important or not? Is the flow
steady or varying with time? What are the primary
forces of importance? For internal ...
1. Introduction to Kinematics
2. Methods of Describing Fluid Motion
a). Lagrangian Method
b). Eulerian Method
3. Flow Patterns
- Stream Line
- Path Line
- Streak Line
- Streak Tube
4. Classification of Fluid Flow
a). Steady and Unsteady Flow
b). Uniform and Non-Uniform Flow
c). Laminar and Turbulent Flow
d). Rotational and Irrotational Flow
e). Compressible and Incompressible Flow
f). Ideal and Real Flow
g). One, Two and Three Dimensional Flow
5. Rate of Flow (Discharge) and Continuity Equation
6. Continuity Equation in Three Dimensions
7. Velocity and Acceleration
8. Stream and Velocity Potential Functions
The explosion hazard in urea process (1)Prem Baboo
In Urea plant passivation air is used in reactor, stripper and downstream of the all equipments. The reactor liner material used Titanium, Zirconium, SS 316L (urea grade), 2RE-69 and duplex material .except Titanium and Zirconium all stainless steel required more passivation air. In CO2 some quantity of Hydrogen is present about 0.14% to 0.2% . The passivation oxygen and Hydrogen makes explosive mixture. To avoid a fire or explosion in a process vessel is to introduce inert (noncombustible) gases in such a way that there is never a mixture with a combustible concentration in exit of MP vent. Mixtures of fuel, oxygen, and inert gases are not combustible over the entire range of composition. In CO2 stripping process the HP scrubber is the risky vessel and this vessel consisting blanketing sphere, Heat exchanger part and a scrubbing part. With help of triangular diagram that shows the shape of the combustible/noncombustible regions for a typical gaseous mixture of fuel, oxygen, and inert at specified temperature and pressure. Present article how to avoid that combustible rang and how to tackle that gases in CO2 & ammonia stripping process.
Over the past two decades, the ammonia and urea industry have witnessed spectacular metallurgical developments for process equipment. For example, stainless steels, modified with special materials, can improve high temperature creep rupture resistance. Using duplex stainless steels and modern corrosion abatement techniques are other methods that improve plant-operating performance.
Ever since the declaration of 100% neem coated urea by India Government, the number of neem trees is increasing continuously in India Neem coated urea requires neem oil, more urea more oil and trees also required more. When it comes to oil, neem plants are rather promising. Probably no other plant yields as many exploitable by-products and benefits. Earlier, 100% Neem Coated Urea was made mandatory in 2015.
Prills /granular urea are not only costly for the producer but may be harmful to humans and the environment. Furthermore, nano Urea may also be used for enhancing abiotic stress tolerance. Nano-Urea prevents environmental pollution and improves physiological traits of wheat grown under drought stress conditions. The nano urea consist of higher surface area because lesser in size of the nano particle and have high reactivity, solubility in water. Nano Urea are the important tools in agriculture to improve crop efficiency, yield and quality parameters with increase nutrient use efficiency, reduce wastage of fertilizers and cost of cultivation. Nano-urea is very effective for precise nutrient management in precision agriculture with matching the crop growth stage for nutrient and may provide nutrient throughout the crop growth period. Nano-Urea increase crop growth up to optimum concentrations further increase in concentration may inhibit the crop growth due to the toxicity of nutrient. Nano-Urea provide more surface area for different metabolic reactions in the plant which increase rate of photosynthesis and produce more dry matter and yield of the crop. It is also prevent plant from different biotic and abiotic stress.
Installation of S-50 ammonia synthesis converter along with waste heat boiler in downstream of existing S-200 ammonia synthesis converter is one of the major schemes of Energy Saving Project of Ammonia plant. The energy saving reported 0.18 G.Cal/T of Ammonia. Several ammonia plants have installed an additional ammonia synthesis converter in combination with a HP steam waste heat boiler, downstream of the existing ammonia converter. The result is increased conversion per pass, reduced compression requirements due to the smaller recycle gas stream, and improved waste heat recovery. Among the methodologies aimed at finding energy saving opportunities, pinch analysis linked to power and steam modeling has proved to be a powerful way for determining projects to improve the overall energy efficiency of industrial sites. This procedure has been applied successfully in many industrial facilities, allowing optimal energy recovery in the process and hence reduction of fuel consumption.
Super conversion in urea reactors with super cup high efficiency traysPrem Baboo
In Urea Conversion gas/liquid mixing in urea reactor with application of high efficiency trays homogeneous and heterogeneous phases’ iquilibria and kinetics is very important. The efficiency of Urea Reactors can be improved by the application of the latest generation of internals .Generally Fluid dynamics phenomenon are created by the concurrent gas liquid flow through the simple perforated trays which generates irregular bubbles now this problem has been solved by new generation high efficiency device super cup patented by M/S. Saipem. Present article intended how conversion increases by super cup with geometry of the shape of super cup etc. The increase in the efficiency has permitted direct benefits to the overall production and energy of the units, thus allowing lower energy consumption and a reduced environmental impact emission of greenhouse gases. The Super Cups can be applied to design a new generation of urea reactors as well as to improve the performance of existing equipment in a revamp design.
In the plant, ammonia is produced from synthesis gas containing hydrogen and nitrogen in the ratio of approximately 3:1. Besides these components, the synthesis gas contains inert gases such as argon and methane to a limited extent. The source of H2 is demineralized water and the hydrocarbons in the natural gas. The source of N2 is the atmospheric air. The source of CO2 is the hydrocarbons in the natural gas feed. Product ammonia and CO2 is sent to urea plant. The present article intended the description of ammonia plant for natural gas based plants and the possible material balance of some section.
Sweet and sour experience of commissioning 1Prem Baboo
The paper describes a successful of plant start-up despite the pandemic difficulties and introduces a set of first considerations about the possible future application of available digital technologies for remote and distributed control system from central control room commissioning of complex Dangote Fertilizer Plants. The numbers of problem were faced during commissioning stage ultimately the 17th march 2021 was the historical date for achieved plant production of line-1 plant .The major problem was pandemic due to which scarcity of staff availability. However numbers of problems faced in Ammonia and urea plants. About 4 time’s unsuccessful attempt were done and finally we got historical success. In this paper we described the failure attempt and types of problems faced in ammonia and urea plants and each time problems were differ from previous.
How to improve safety and reliability of the high pressure section of urea pl...Prem Baboo
This paper elaborates the most critical safety hazards: Ruptures and toxic ammonia leaks. The paper also provides the Top 10 prevention and mitigation measures. To minimize / avoid that incidents do repeat, we recommend to make use of the Center for Chemical Process Safety: Risk Based Process Safety Management approach. Pay proper attention to avoid ruptures, to handle leaks and to apply the right and state-of-the-art leak detection systems.
Experience of material in fertilizers industriesPrem Baboo
Materials plays very important role in any industry. Selection of material is vital at design stage itself ,Wrong selection of material may lead to catastrophic failures and outage of plants & even loss of Human lives, Right selection of material leads to long life of plant. In the latest plants specialty 2 RE-69 materials are used for liner. The actual reactor has been constructed using a variety of materials, e.g. Zirconium, Vessel inside a protective liner. This paper intended study Material in urea plant in different vessels and equipment design. In Primary reformer numbers of materials are modified such as micro alloy are also used in tubes.
This book covers design of high Pressure equipment and developments, Process flow diagram of different section of Ammonia, Urea and others fertilizers .Fundamentals of ammonia urea plant trouble shooting risk assessment corrosion in different vessels and remedies. This book is useful for Engineers and Sr. Managers for plant commissioning and trouble shooting and Engineering Students. This book contains about 51 tables and 144 useful diagram and chart graphics etc. Detail description of ammonia/CO2 stripping process and new developments. Design Parameters of High pressure vessel and comparison. Study of corrosion for various equipments and control. How to control corrosion by changing of equipments material.
High pressure vessel_leakage_in_urea_plants (1)Prem Baboo
In urea plant ammonium carbamate solution is very corrosive; all metals have corrosion problems with ammonium carbamate and the corrosion problems increase with temperature, a ten degree Celsius rise in temperature doubles the corrosion rate to the point where the duplex steel is no longer acceptable. The material plays a very important role in Urea plants. The space between the reactor liner and the shell is most often empty and employs various methods of detecting a leak ranging from conductivity measurements. Vacuum leak detection system, pressure leak detection system etc. Titanium, SS316L (urea grade), 2 RE-69 etc.) Over the years that can resist ammonium carbamate corrosion. Materials plays very important role in any industry. Selection of material is vital at design stage itself ,Wrong selection of material may lead to catastrophic failures and outage of plants & even loss of Human lives, Right selection of material leads to long life of plant. In the latest plants specialty duplex materials are used for liner. The actual reactor has been constructed using a variety of materials, e.g. Zirconium, Vessel inside a protective liner. This paper intended study of number of leakage in the HP loop vessels, e.g. Zirconium, Vessel inside a protective liner. This paper intended study of number of leakage in the HP loop vessels, e.g. Reactor, Stripper, Carbamate condenser etc. How to detect leakage and troubleshooting during detection and attending the leakages.
High pressure vessel leakage in urea plantsPrem Baboo
In urea plant ammonium carbamate solution is very corrosive; all metals have corrosion problems with ammonium carbamate and the corrosion problems increase with temperature, a ten degree Celsius rise in temperature doubles the corrosion rate to the point where the duplex steel is no longer acceptable. The material plays a very important role in Urea plants. The space between the reactor liner and the shell is most often empty and employs various methods of detecting a leak ranging from conductivity measurements. Vacuum leak detection system, pressure leak detection system etc. Titanium, SS316L (urea grade), 2 RE-69 etc.) Over the years that can resist ammonium carbamate corrosion. Materials plays very important role in any industry. Selection of material is vital at design stage itself ,Wrong selection of material may lead to catastrophic failures and outage of plants & even loss of Human lives, Right selection of material leads to long life of plant. In the latest plants specialty duplex materials are used for liner. The actual reactor has been constructed using a variety of materials, e.g. Zirconium, Vessel inside a protective liner. This paper intended study of number of leakage in the HP loop vessels, e.g. Zirconium, Vessel inside a protective liner. This paper intended study of number of leakage in the HP loop vessels, e.g. Reactor, Stripper, Carbamate condenser etc. How to detect leakage and troubleshooting during detection and attending the leakages.
If the material of liner changed with 2RE 69 or Duplex material instead of SS316(urea grade), then passivation air can be reduced, resulting the energy saving because the inerts vented from M.P section and loss of ammonia and problem of pollution. To enhance capacity and energy of the existing plant the internals like vortex mixture and HET may be changed the capacity may increase up to 10-15%.HET, you can changed with super cup.The CO2 and feed top of the vortex mixture nozzle and Ammonia plus carbamate feed from side of the vortex mixture. In the mixing area the initial dispersion of gas and formation of liquid – gas mixture are performed.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
1. PRINCIPLE OF MASS FLOW METER
PRESENTED BY
PREM BABOO
Sr. Manager(Prod)
National Fertilizers Ltd. India
An Expert for www.ureaknowhow.com
FIE institution of Engineers India
2. Mass Flow Operating Principle:
Contents:
1. How does a Mass flow meter measure mass
flow?
2. Why do the tubes vibrate?
3. How does the sensor detect mass flow
measurement?
4. What is the flow calibration factor and Delta-
T and how do these relate to the mass flow
measurement?
5. How does a flow meter measure volume flow?
3. PRINCIPLE OF MASS FLOW METER
A Mass Flow Meter operating on the "Coriolis principle" contains a
vibrating tube in which a fluid flow causes changes in frequency,
phase shift or amplitude. The sensor signal is fed into the integrally
mounted pc-board. The resulting output signal is strictly proportional
to the real mass flow rate, whereas thermal mass flow meters are
dependent of the physical properties of the fluid. Coriolis mass flow
measurement is fast and very accurate.A mass flow meter, also known as
an inertial flow meter is a device that measures mass flow rate of
a fluidtraveling through a tube. The mass flow rate is the mass of the fluid
traveling past a fixed point per unit time.
The mass flow meter does not measure the volume per unit time (e.g., cubic
meters per second) passing through the device; it measures the mass per unit
time (e.g., kilograms per second) flowing through the device. Volumetric flow
rate is the mass flow rate divided by the fluid density. If the density is constant,
then the relationship is simple. If the fluid has varying density, then the
relationship is not simple. The density of the fluid may change with
temperature, pressure, or composition, for example. The fluid may also be a
combination of phases such as a fluid with entrained bubbles. Actual density
can be determined due to dependency of sound velocity on the controlled
liquid concentration.[
4. If the fluid has varying density, then the relationship is
not simple. The density of the fluid may change with
temperature, pressure, or composition, for example.
The fluid may also be a combination of phases such as
a fluid with entrained bubbles. Actual density can be
determined due to dependency of sound velocity on
the controlled liquid concentration.
7. In a Coriolis mass flow meter, the “swinging” is generated by
vibrating the tube(s) in which the fluid flows. The amount of
twist is proportional to the mass flow rate of fluid passing
through the tube(s). Sensors and a Coriolis mass flow meter
transmitter are used to measure the twist and generate a
linear flow signal.
Coriolis mass flow meters measure the mass flow of
liquids, such as Ammonia, water, acids, caustic,
chemicals, and gases/vapors. Because mass flow is
measured, the measurement is not affected by fluid
density changes
8. Coriolis mass flowmeters measure the force resulting
from the acceleration caused by mass moving toward
(or away from) a centre of rotation. This effect can be
experienced when riding a merry-go-round, where
moving toward the centre will cause a person to have
to “lean into” the rotation so as to maintain balance.
As related to flow meters, the effect can be
demonstrated by flowing water in a loop of flexible
hose that is “swung” back and forth in front of the
body with both hands. Because the water is flowing
toward and away from the hands, opposite forces are
generated and cause the hose to twist.
9. There are two basic configurations of coriolis flow meter:
the curved tube flow meter and the straight tube flow meter.
This article discusses the curved tube design. The animations
on the right do not represent an actually existing coriolis flow
meter design. The purpose of the animations is to illustrate the
operating principle, and to show the connection with rotation
Fluid is being pumped through the mass flow meter. When there
is mass flow, the tube twists slightly. The arm through which
fluid flows away from the axis of rotation must exert a force on
the fluid, to increase its angular momentum, so it bends
backwards. The arm through which fluid is pushed back to the
axis of rotation must exert a force on the fluid to decrease the
fluid's angular momentum again, hence that arm will bend
forward.
In other words, the inlet arm is lagging behind the overall
rotation, and the outlet arm leads the overall rotation.
11. The animation on the right represents how
curved tube mass flow meters are designed.
When the fluid is flowing, it is led through two
parallel tubes. An actuator (not shown) induces
a vibration of the tubes. The two parallel tubes
are counter-vibrating, to make the measuring
device less sensitive to outside vibrations. The
actual frequency of the vibration depends on
the size of the mass flow meter, and ranges from
80 to 1000 vibrations per second.
The amplitude of the vibration is too small to
be seen, but it can be felt by touch.When no
fluid is flowing, the vibration of the two tubes is
symmetrical, as shown in the animations.
12.
13. The animation on the right represents what happens during
mass flow. When there is mass flow, there is some twisting of the
tubes. The arm through which fluid flows away from the axis of
rotation must exert a force on the fluid to increase its angular
momentum, so it is lagging behind the overall vibration. The
arm through which fluid is pushed back towards the axis of
rotation must exert a force on the fluid to decrease the fluid's
angular momentum again, hence that arm leads the overall
vibration.
The inlet arm and the outlet arm vibrate with the same
frequency as the overall vibration, but when there is mass flow
the two vibrations are out of sync: the inlet arm is behind, the
outlet arm is ahead. The two vibrations are shifted in phase
with respect to each other, and the degree of phase-shift is a
measure for the amount of mass that is flowing through the
tubes.
14.
15. Coriolis forces Fc are generated in oscillating systems when a
liquid or a gas moves away from or towards an axis of
oscillation.
A Coriolis measuring system is of symmetrical design and
consists of one or two measuring tubes, either straight or
curved.A driver sets the measuring tube (AB) into a uniform
fundamental oscillation mode.When the flow velocity v = 0
m/s / 0 ft/s, the Coriolis force Fc is also 0. At flowing
conditions, i. e. flow velocity v > 0 m/s / 0 ft/s, the fluid
particles in the product are accelerated between points AC and
decelerated between points CB.
16. The Coriolis force Fc is generated by the inertia
of the fluid particles accelerated between
points AC and of those decelerated between
points CB.
This force causes an extremely slight distortion
of the measuring tube that is superimposed on
the fundamental component and is directly
proportional to the mass flow rate.
This distortion is picked up by special sensors.
Since the oscillatory characteristics of the
measuring tube are dependent on
temperature, the temperature is measured
continuously and the measured values
17. Density and volume measurements
The mass flow of a u-shaped coriolis flow meter
is given as:
where Ku is the temperature dependent stiffness of the
tube, K a shape-dependent factor, d the width, τ the time
lag, ω the vibration frequency and Iu the inertia of the tube. As
the inertia of the tube depend on its contents, knowledge of the
fluid density is needed for the calculation of an accurate mass
flow rate.If the density changes too often for manual
calibration to be sufficient, the coriolis flow meter can be
adapted to measure the density as well.
18. The natural vibration frequency of the flow tubes depend on
the combined mass of the tube and the fluid contained in it. By
setting the tube in motion and measuring the natural
frequency,
the mass of the fluid contained in the tube can be deduced.
Dividing the mass on the known volume of the tube gives us
the density of the fluid.
An instantaneous density measurement allows the calculation
of flow in volume per time by dividing mass flow with density.
19. Calibration
Both mass flow and density measurements depend on the
vibration of the tube. Calibration is affected by changes in the
rigidity of the flow tubes.
Changes in temperature and pressure will cause the tube
rigidity to change, but these can be compensated for through
pressure and temperature zero and span compensation factors.
Additional effects on tube rigidity will cause shifts in the
calibration factor over time due to degradation of the flow
tubes. These effects include pitting, cracking, coating, erosion or
corrosion. It is not possible to compensate for these changes
dynamically, but efforts to monitor the effects may be made
through regular meter calibration or verification checks. If a
change is deemed to have occurred, but is considered to be
acceptable, the offset may be added to the existing calibration
factor to ensure continued accurate measurement.
20.
21. Application Cautions for Coriolis Mass
Flow meters
If the pressure drop is acceptable, operate a Coriolis mass flow
meter in the upper part of its flow range because operation at
low flow rates can degrade accuracy. Note that high viscosity
fluids increase the pressure drop across the flow meter. For
liquid flows, make sure that the flow meter is completely full of
liquid. Be especially careful when measuring gas/vapor flow
with Coriolis mass flow meters. Pay special attention to
installation because pipe vibration can cause operational
problems.