Flow Meters
Sharif College of Engineering and Technology
Subject: Fluid Dynamics
Submitted by: HAFIZ M.ATEEQ UR REHMAN
Department: Chemical Engineering
Roll No. 28
Submitted to: Madam Asma Ashraf
Dated: 12-04-2013
STEPS INVOLVED IN THE SELECTION FLOW METER
There are well over 20 different types of flow meters, even if we lump the various positive-displacement flow meters together as one type. Unless the process engineer knows the pros and cons of each type, it can be a daunting task to properly select one. Here are just some of the factors to consider before selecting a flow meter:
• Its size and measuring range of the flow meter
• Chemical compatibility
• Process accuracy requirements• Pressure requirements
• Acceptable pressure drop
• Cleaning requirements (i.e., do you need, and does the unit offer,
Clean-in-place capabilities?)
• Desired measurement units (such as volume, velocity or mass)
• Uni-directional or bi-directional measurement
• Fluid viscosity limitations
• Necessary approvals for use in hazardous areas, sanitary applications and so on (examples include Factory Mutual, Canadian Standards Assn., 3-A Standards and Accepted Practices, and Underwriters’ Laboratory approvals)
• Custody-transfer approvals
• Data-output requirements (i.e., 4–20 mA, relay, digital or simple display)
• Calibration and re-calibration requirements
• Maintenance issues
• Operating costs
• Connection styles (flanged, wafer, threaded, weld-on and so on)
MAGNETIC FLOW METER
A Magnetic flow meter is a volumetric flow meter which does not have any moving parts and is ideal for wastewater applications or any dirty liquid which is conductive or water based. Magnetic flow meters will generally not work with hydrocarbons, distilled water and many non-aqueous solutions). Magnetic flow meters are also ideal for applications where low pressure drop and low maintenance are required.
Subject: Fluid Dynamics
Submitted by: HAFIZ M.ATEEQ UR REHMAN
Department: Chemical Engineering
Roll No. 28
Submitted to: Madam Asma Ashraf
Dated: 12-04-2013
STEPS INVOLVED IN THE SELECTION FLOW METER
There are well over 20 different types of flow meters, even if we lump the various positive-displacement flow meters together as one type. Unless the process engineer knows the pros and cons of each type, it can be a daunting task to properly select one. Here are just some of the factors to consider before selecting a flow meter:
• Its size and measuring range of the flow meter
• Chemical compatibility
• Process accuracy requirements• Pressure requirements
• Acceptable pressure drop
• Cleaning requirements (i.e., do you need, and does the unit offer,
Clean-in-place capabilities?)
• Desired measurement units (such as volume, velocity or mass)
• Uni-directional or bi-directional measurement
• Fluid viscosity limitations
• Necessary approvals for use in hazardous areas, sanitary applications and so on (examples include Factory Mutual, Canadian Standards Assn., 3-A Standards and Accepted Practices, and Underwriters’ Laboratory approvals)
• Custody-transfer approvals
• Data-output requirements (i.e., 4–20 mA, relay, digital or simple display)
• Calibration and re-calibration requirements
• Maintenance issues
• Operating costs
• Connection styles (flanged, wafer, threaded, weld-on and so on)
MAGNETIC FLOW METER
A Magnetic flow meter is a volumetric flow meter which does not have any moving parts and is ideal for wastewater applications or any dirty liquid which is conductive or water based. Magnetic flow meters will generally not work with hydrocarbons, distilled water and many non-aqueous solutions). Magnetic flow meters are also ideal for applications where low pressure drop and low maintenance are required.