First, the building’s main was cleaned and brought back to its original diameter using Nu Flow’s proprietary cutting tools.

1. Root intrusion is extremely common for sewer laterals running outside of buildings to the city mains. If your property is
experiencing reduced flow from its drains, root intrusion could be the perpetrator. Nu Flow’s innovative main rehabilitation
system uses in-place technology to prevent destruction and disruption, keeping the project’s work behind-the-scenes.
Project: Use the Nu Main system to rehabilitate a failing sewer lateral
without causing disruption to the trolley station and tracks above it.
Customer and Site: The Westgate Hotel is a landmark luxury hotel with
antique decor, located in Downtown San Diego, California. Built in 1970,
this one-of-a-kind hotel has 19 floors and 223 guest rooms.
System: The 10" diameter cast iron and clay sanitary lateral that takes
all the waste from the hotel to the city main. This 44-year-old main is
suspended 12 feet in the air, running along the ceiling of the hotel’s
basement’s main laundry room. The pipe goes through the hotel’s
foundation wall and runs beneath city sidewalks, the nearby Civic Center
Trolley Station and its trolley tracks.
Problem: More than 40 years of pipe deterioration due to age and natural
ground shifting caused the clay and cast iron lateral’s joints to fail. This
allowed nearby Ficus trees’ roots to enter the pipe system, grow rapidly
and create blockages (root intrusion), causing backups for the hotel’s
sewer main. Maintenance on the pipe included routine Vactor jetting for
the past 15 years, but the customer finally decided to find an effective,
long-term solution. The failed joints are directly below the adjacent trolley
station and its double set of tracks, so excavation is not feasible.
Circumvention: If the customer had not chosen Nu Flow’s technology,
there would not be many choices left for the customer. A repipe would
include having to dig up the trolley station and tracks that lay above the
lateral. To get that type of excavation approved by the city would be an
enormous, tedious and very expensive feat. If approved, the trolley’s
downtown stops would be severely inconvenienced, most likely causing
service disruptions for the busy transportation system. An in-situ solution
was definitely more palatable.
Solution: First, the building’s main was cleaned and brought back to its
original diameter using Nu Flow’s proprietary cutting tools. The roots inside
the 10" diameter pipe were cut and flushed out, using existing access
points. Effluent was diverted and bypassed to allow liner installation.
Then, the Nu Main system was carefully installed in the underground
pipe line from the hotel to the trolley tracks. An epoxy-saturated felt liner
was inserted into the lateral using a patented Pull-in-Place process. The
liner cured to form a protective, seamless structural liner that covers
all breaches in pipe and will serve as a long-term solution against root
intrusion, backups and other common drain failures.
Nu Flow’s innovative solution prevented the busy downtown sidewalk and neighboring trolley station’s tracks from being
excavated, while also greatly extending the useful life of the hotel’s drain main. There was absolutely no destruction or
disruption to the hotel sewer service, trolley station or nearby areas for a fraction of the cost of a traditional excavation.
Nu Flow Preserves Downtown San Diego Trolley Tracks
Where life interacts with infrastructure.
North America: 1-800-834-9597 | International: 1-905-433-5510
info@nuflowtech.com | www.nuflowtech.comp/n 687 v1.1
“In my opinion, the work
performed by Nu Flow to
achieve the lining of this very
important pipe is priceless.
They worked very efficiently and
knew exactly what they were
doing. I had never watched the
lining process before and I am a
total believer now.”
- Mike O. Ryan, Chief Engineer,
The Westgate Hotel