HOW TO SIZE A PITOT TUBE FLOW METER for

AIR*GAS*LIQUIDS*SATURATED & SUPERHEATED STEAM & WATER
THE CORRECT CHOICE OF A SENSOR WILL PROVIDE YOUR CUSTOMER WITH A FLOWMETER THAT WILL GIVE MANY YEARS OF SATISFACTORY PERFORMANCE. THERE ARE MANY FACTORS THAT ENTER INTO THIS DECISION PROCESS. EACH ITEM IS VERY IMPORTANT AND NECESSARY BEFORE THE FINAL SELECTION CAN BE MADE.
HERE IS A LIST OF THE QUESTIONS THAT NEED TO BE ANSWERED, THEY ARE NOT LISTED IN ANY PARTICULAR ORDER AS ALL OF THIS INFORMATION IS NEEDED.
  1. WHAT IS FLOWING IN THE PIPE OR DUCT?
  2. WHAT IS THE STATIC PRESSURE IN THE PIPE OR DUCT?
  3. WHAT IS THE TEMPERATURE? DEG. F. OR DEG. C.
  4. WHAT IS THE PIPE OR DUCT MATERIAL? THIS WILL AFFECT HOW THE METER IS MOUNTED. FIBERGLASS, DUCTILE IRON AND PVC REQUIRES A SERVICE SADDLE. YOU CANNOT WELD TO COPPER OR BRASS.
  5. WHAT IS THE MINIMUM FLOW? IS THERE ENOUGH TO MAKE A D/P SIGNAL THAT CAN BE READ BY YOUR TRANSMITTER OR GAUGE?
  6. WHAT IS THE MAXIMUM FLOW? LOOK AT MAXIMUM FLOW CHART ON THE MAXIMUM FLOW PAGE. THE MAXIMUM FLOW WILL DETERMINE WHETHER YOU NEED A DOUBLE MOUNT OR A SUPER DUTY SENSOR.
  7. DOES THE CUSTOMER WANT A HOT-TAP? THESE UNITS CAN BE INSTALLED WITH PRESSURE AND TEMPERATURE IN THE SYSTEM.
  8. DOES THE CUSTOMER REQUIRE A FLANGE MOUNT? SOME PIPING CODES REQUIRE SLANGE MOUNTS ON SOME APPLICATIONS. ONLY THE SUCTOMER WILL KNOW THIS!
  9. HOW IS THE CUSTOMER GOING TO READ THE SIGNAL?
    WILL THEY USE A D/P TRANSMITTER OR MECHANICAL GAUGE?
  10. DOES THE APPLICATION REQUIRE ANY SPECIAL ALLOYS? WE PROVIDE SENSORS IN MANY EXOTIC ALLOYS


CONVERSIONS

Bars x 14.5=PSI
Cubic Feet Liquid x 7.481=US Gallons
Cubic Meters (Liquid) x 264.2=US Gallons
Cubic Meters x 35.31=Cubic Feet
Density (#/cu. ft)=Specific Gravity x 0.0764
Imperial Gallon x 1.201=US Gallons
Inches of Water x 0.036=PSI 		Kg/cm2 x 14.22=PSI
Kilopascal(KPA) x 0.145=PSI
Liter/sec x 15.85011=GPM
Liter/MIN x 0.2642=GPM
Millimeters / 25.4=Inches
NM3/Hr (Gas) x 0.622=SCFM
Pounds of Water x 0.1198=US Gallons
Square to Round Equivalent= see Flow Calc. page