Phased Assessment Strategy for Sewers

Phased Assessment
Strategy for Sewers (PASS)
A Plan for Understanding Sewer Condition Quicker,
With Fewer Resources

Are deteriorating infrastructure and dwindling budgets forcing
you to reevaluate your sewer inspection program?
If so, it can be hard to know where to start, especially with limited
bandwidth and resources. Here you’ll learn about a new workflow; one
that will save your department money, help optimize resource
utilization, and allow your inspection crews to focus their attention on
the sewer assets that need it most.
Introduction

Expectations/Responsibilities
Municipalities are required to:
•Maintain an up-to-date understanding of collection system
condition.
•Meet environmental regulations.
•Prevent infrastructure failures (SSOs, residential backups, wet
weather discharges, costly and unpleasant emergency backups).
•Prioritize maintenance activities.
•Reduce maintenance costs
•Reduce environmental impact
All with fewer and fewer resources

For decades we’ve used costly, time consuming CCTV as our sole tool for
understanding pipe condition.
We can no longer afford to “do it the way we’ve always done it”.
This presentation outlines a game plan- to use our diminishing resources more
effectively, using technology, resulting in greater productivity and better results.
Inspecting/Cleaning Smarter
Read the complete paper at envirosight.com/pass

Step 1: Technology
Zoom Camera
Zoom survey cameras employ a video camera
mounted on a telescopic pole to view deep
within pipes from an adjacent manhole, as well
as inspect the manhole itself. The technology
uses high-powered optics and focused
illumination
Zoom cameras don’t replace conventional CCTV
inspection, but rather identify exactly which
pipes need further investigation. Sewer lines
don’t need to be cleaned before a zoom survey,
and therefore can be assessed quickly by a
single operator.

Step 1: Technology
Zoom Camera
During Phase 1, you survey all your sewer
pipes with a zoom camera. When defects
are observed or the view is obstructed in a
particular pipe, flag it for the next
inspection phase.
• Determines next step for a section of pipe
o In good condition
o Needs cleaning
o Needs further inspection
o Needs rehab
• Helps determine proper tooling for cleaning
and ensures efficient use of resources

Phase 1: Workflow

Step 2: Technology
HD Video Nozzle
Cleaning is an important part of pipe
maintenance, and an essential prerequisite
for CCTV inspection. Any line that doesn’t
pass Phase 1 needs to be cleaned to
remove the grease and debris that interfere
with a CCTV crawler. In many cases these
obstructions are the only problem with the
pipe, and a quick post-cleaning video nozzle
assessment can confirm that no additional
crawler CCTV is needed.
A video nozzle is a water-propelled HD camera
that threads on the jetter hose, allowing
rapid collection of detailed visual
information about a pipe’s condition post-
cleaning.

Step 2: Technology
HD Video Nozzle
On average, only 65% of pipes surveyed
with a zoom camera will require
additional attention, which starts with
cleaning. Once the cleaning crew
finishes cleaning the line they can
quickly assess if any defects are present
in the sewer lines and make a
recommendation as to whether the pipe
segment should be thoroughly inspected
using a CCTV Crawler, or marked as
PASS.

Phase 2: Workflow

Step 3: Technology
CCTV Inspection Crawler
For lines where a Phase 2 video nozzle
inspection reveals pipe defects, a final
CCTV camera crawler inspection is
warranted. Crawler inspections reveal
the highest level of detail.
CCTV inspections are essential for
identifying and characterizing breaks,
root intrusions, leaking water, and
other kinds of deterioration. No
inspection program can operate
without a CCTV Crawler because of its
unique ability to fully understand the
problems inside a sewer pipe.

Step 3: Workflow

Benefits
To understand the benefits of this workflow, look at the productivity and
cost advantages of a phased approach compared to comprehensive CCTV
inspection.

Productivity Benefits

Cost Benefits

PASS in Review
PASS consists of a three assessment phases:
• Zoom camera survey for 100% of pipes.
• Video nozzle for 65% of pipes that need it.
• CCTV crawler inspection for 25% of pipes that need it.
By implementing PASS, you can:
• Boost productivity 17%
• Reduce costs 34%

Will You PASS?
• Reduce costs
• Improve response time for inspection
• Reduce emergency call-outs
• Channel resources to where they’re needed most
• Make the best possible impact on the infrastructure, environment and
community you serve

Learn more …
Want to learn more about PASS? Visit http://www.envirosight.com/pass to
download the complete white paper.
Learn more about the technology behind PASS and request a free in-field
demo by clicking below:
• Quickview airHD zoom camera
• Jetscan video nozzle
• ROVVER X sewer inspection camera

Phased Assessment Strategy for Sewers

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