SYSTEM PERFORMANCE 9
Rev C
Pressure Drop Through Elevation
Faucet elevation can play a major factor in Merlin performance. Faucet
elevation produces a backpressure on the Merlin unit from the elevated
column of water. We recommend minimizing elevation differences
between the Merlin unit and water faucet. Estimate pressure drop due to
elevation according to the following equation:
Pressure drop = 0.43 psi/ft X elevation in feet
(Pressure drop = 0.1 bar/m X elevation in meters)
Figure 6
EXAMPLE:
Q: A Merlin will be installed with 1 tee, 2 valves, and 1 elbow.
Find the obstruction pressure drop.
A: The obstruction pressure drop is found as follows:
4 fittings X 1/2 psi (0.034 bar) each = 2 psi (0.137 bar) obstruction
pressure drop
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Floor
Dispensing Faucet
RO Assembly
Elevation
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