Submersible Pumps and Motors

Ocean Desalination Test Slant Well

CASE STUDY Dana Point

Source: Geoscience

SP UGP

The Challenge Pioneering Desalination Intake Systems

Despite the vast ocean bordering these cities, drinkable water Slant wells are drilled at an angle, which allows for the slant well to
remains scarce on land – 90 percent of south Orange County's pump water from below the ocean surface. The sea water obtained by
drinking water is imported from other parts of the state. For more this method contains fewer impurities and has silt density indices
than a decade, local water districts in South County have partnered that are below current SWRO feedwater supply standards, which
with cities to explore the possibility of developing a desalination reduces the need for pretreatment. The subsurface intake approach
plant in Dana Point to convert ocean water to drinkable water for the also reduces issues related to impingement and entrainment, thus
area. eliminating impacts on the ocean ecosystem that occur from open
ocean intakes.
The primary goal of the Doheny Desalination Project is to secure a
reliable source of water for south Orange County; currently, the GEOSCIENCE designed and drilled the
region has no relief options in the case of droughts or emergency first successful artificially filter packed
situations that may cut off the water supply from Northern California. slant well near Dana Point for the
Metropolitan Water District of Orange
The Metropolitan Water District of Southern California – supplying County, a project now being managed
water to Orange, Los Angeles, San Diego, Riverside, San Bernardino by the South Coast Water District.
and Ventura counties – imports the majority of its water from the
Colorado River. But there is a resource that is readily available to be The tests of the slant well design in
tapped that could solve all of these problems. “There's an unlimited Dana Point - the first of its kind in the
water supply in the ocean right outside the window”. state -, proved feasible, because not
San Francisco
only was the well able to draw in
Desalination plants aren't a revolutionary concept: Plants with open enough water, but the water quality was
intake valves indiscriminately take in water above the ocean floor and good and no marine life was taken in.
California
in the process also pull in marine life. The Coastal Commission
prefers subsurface intake designs, which take in water from beneath
the ocean floor, thus avoiding taking in plants and animals conside-
ring just open intake where subsurface is not feasible.

Seawater desalination is a viable alternative for Coastal communities Los Angeles

across California. Use of low angled wells (slant wells) produce Dana Point
ground water from near shore and offshore aquifer systems and
provides a number of potential advantages over open ocean intake
systems. The aquifer system provides natural filtration from
suspended organic matter and sediment eliminating the need for
pretreatment.
 INDAR supplies a submersible pump for Dana Point
Possible facility
The INDAR Series SP UGP is the right answer to this challenging technology for
Pioneering desalination Intake Systems.

l.
San

oS
The INDAR SP UGP Series Submersible electropump set consist of a vertical Juan

sp
multistage centrifugal pump, and an ISM ML electric motor directly coupled to the

bi
Creek

lO
pump.

De
The INDAR ISM ML electric motors are submersible, asynchronous, three-phase,
squirrel cage rotor types. These motors must operate filled with water (or a mixture
of water and antifreeze) and be fully submerged.

The INDAR pump set UGP-1040-01 + ML-25S-3/070-N was installed in Dana Point
Possible wells
slant well in 2009.
Test
The test showed consistent high efficiency pumping for nearly two years with very well
low silt density index.

Land Surface
Drill Rig
SOCOD SLANT WELL TECHNOLOGY
Ocean Surface

23º
Vault

Fresh Infi
ltra
tio
n

Water Main Aquifer

Salt Ocean Bottom
40 to 130 feet
+
-
Water
Slant Test Well
200 to 250 feet +
-

Motor Output Voltage Weight Diameter Height

Model (in)
(HP) (V) (Lb.) (in)

UGP-1040-01 + ML-25S-3/070-N 100 480 963 10.43 93.55

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