Embed Size (px)
Citation preview
7/30/2019 Flowmeter Sizing
http://slidepdf.com/reader/full/flowmeter-sizing 1/1
Home Technical Support Flow Meter Sizing
All standard flowmeters are calibrated at Standard Temperature and Pressure ("STP" 68°F/ 20°C and 14.7 psia/ 1 ATM). Whensizing a flowmeter that will operate at conditions other than "STP", it is important that the maximum flowrates of the fluid beconverted to equivalent standard flowrates of air or water. To do this, calculate the equivalent flowrates of air or water at "STP"as shown below, then select the appropriate flowmeter for your application.
The correction factors that are calculated from the equations below should only be used for sizing
For Gases:
Where:
Qair
= Equivalent air flow at STP
Qgas= Maximum flow of gas
G = Specific gravity of gasTact = Absolute Temperature at flow
conditions in deg. K or deg. RTo = Absolute temperature at STP,
in deg. K (294) or deg. R (530)Pact = Pressure at flow conditions (psia)
Po = Pressure at STP (14.7 psia)
Conversion Factors
To go from Multiply by To get to
BAR 14.5 PSI
ATM 14.7 PSI
CCM 0.001 LPM
CCM 0.016 GPH
Gallon 3.785 Liters
GPH 62.5 CCM
GPM 3.785 LPM
GPM .227 m3/hr
LPM 1000 CCM
LPM 0.2642 GPM
LPM 2.119 ft3/hr
LPM 0.0353 ft3/min
SCFM 28.31 LPM
SCFH 472 CCM
SCFH 0.472 LPM
For Liquids:
Where:
Qwater
= Equivalent water flowrate at STP
Qliq = Maximum flowrate of metered liquid
df = Density of float selected (g/mL)
dL = Density of meters liquid (g/mL)
dw= Density of water at STP (1 g/mL)
Float Densities
Material Density (g/mL)
Glass 2.53
Sapphire 3.98
Stainless Steel 8.04
Carboloy 14.98
Tantalum 16.58
Absolute Temperatures are inRankine (°R) or Kelvin (°K)
°R = °F + 460
°K= °C + 273
Flowmeter Sizing
Key Instruments
250 Andrews Road
Trevose, PA 19053-3491 USA
In USA and Canada: (800) 356-7483
Direct: (215) 357-0893
Fax: (215) 357-9239
Email: [email protected]
Home
Contact Us
About Us
Career Opportunites
Brooks Instrument
ShareThis
Copyright 2010 Key Instruments.
At Key Instruments, our success is built on recognizing that product manufacturers need more fromtheir flow instrumentation suppliers than simplyproviding a standard product catalog. Manufacturers of medical equipment, industrial gas mixing and distr ibution systems, aquaculture control equipment,
gas and liquid analyzers, w ater handling and treatment skids, and many others continue to partner with us due to our unique ability to drive costs out of thefinal product. When maintaining a world-class supply chain is critical, premier product manufacturers call Key.
Home Custom Solutions Standard Products Technical Support Quality Store
Flowmeter Sizing 03/01/2013
http://www.keyinstruments.com/technical-support/flow-meter-sizing 1 / 1
