5.
Elevation and Pressure - the following procedures are taken to adjust for elevation differences, the basic
equation is for level pipe.
a. Elevation difference between the upstream and downstream points of a pipeline. Pressure readings
between the two points of the pipeline are taken from pressure gages and reflect the pressure at what ever the
elevation may be.
Example 1:
Upstream elevation - 800 feet,
Downstream elevation - 850 feet.
NOTE: Answer is difference between the two points: 850 - 800 = 50 feet.
Example 2:
Upstream - 225 psi.
Downstream - 195 psi.
NOTE: Answer is difference between the two points: 225 - 195 = 30 psi.
b. To adjust pressure for elevation the following steps are taken.
Formula: The equation for determining pressure loss due to elevation.
NOTE: To use this formula, it must be rewritten in the following manor:
c. To determine pressure based on elevation the following equation is used.
15-7
QM5200
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