Chart values must be considered as approximate because a number of factors such as specific gravity, orifice efficiency, plumbing ahead of and behind the orifice may cause variations from the values shown.

Using a heavier fluid, a multiplying factor should be applied to chart values.

For example, to find the pressure drop of water, with a specific gravity of 1.00.

Drill orifice undersize to start and run a preliminary test; then enlarge as necessary using standard twist drills.

A shoulder on the plug keeps it from being pushed out of place by hydraulic pressure.

Be sure plug is installed with shoulder facing toward the pressure.

Remember, the sharper the edge of the orifice, the less the flow and pressure drop will be affected by changes in the fluid viscosity and temperature.

This company assumes no liability for errors in data nor in safe andor satisfactory operation of equipment designed from this information.

If L 1 is known and is more than 90 of L T, then L 2 may vary by 5 without altering the value of L T by more than 1, even though the value of L 2 may be as high as 40 of L T.

To determine the intermediate pressure between two resistances in series, the following formulas may be used.

Orifice In Series Calculation