slide1 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
The excavator’s push for damage prevention PowerPoint Presentation
Download Presentation
The excavator’s push for damage prevention

Loading in 2 Seconds...

play fullscreen
1 / 59

The excavator’s push for damage prevention - PowerPoint PPT Presentation


  • 331 Views
  • Uploaded on

The excavator’s push for damage prevention. DAMAGE PREVENTION CONFERENCE. Mike Kemper , NPL Construction Company December 9, 2008. The Often Forgotten Underground World. Who is NPL?. CORE BUSINESS:. The safe installation & maintenance of reliable energy distribution systems.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'The excavator’s push for damage prevention' - Leo


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

The excavator’s push for damage prevention

DAMAGE PREVENTION CONFERENCE

Mike Kemper,NPL Construction Company December 9, 2008

who is npl
Who is NPL?

CORE BUSINESS:

  • The safe installation & maintenance of reliable energy distribution systems
  • 2500 employees
  • 5.7M work hours
  • 16.5M feet installed/replaced
  • Fleet of over 3000 units ranked in Top 20 in construction industry
  • Heavy One-Call user
slide6

Do we have a problem?

Who’s responsible for marking?

Sewer Main

Lateral to mains connection

Installed line

House

City street

Property line

What could happen?

slide7

Old Gas Service Line

Sewer Lateral

New Gas Main

slide8

Madill, OK 1992

Some hits are a time bomb!

Madill, OK 2007

odds of getting a hole in one
Odds of getting a hole in one

1 in 12,000

.01%

Montana Gimmie

cga conference march 2008
CGA ConferenceMarch 2008

• 2/3 of attendees raised their hands

  • Result: Best Practices Task Group

Q & A

“How many of you have experienced Crossbores?”

slide13

What we know:

  • Minnesota Public Utilities Commission
    • 27 cross bores reported in a 6 month period
  • Palo Alto, CA
    • 4 blocks inspected. 24 cross bores found
  • City A
    • 2 cross bores per mile in 200 miles of sewer main
    • One cross bore at a school
  • City B
    • 3 cross bores per mile of sewer main
    • One cross bore at a hospital
  • City C
    • 2% cross bores out of 11,000 sewer laterals inspected
how often do explosions happen known explosions in past 10 years
Austell, GA

Bellwood, IL

Burlington, VT

Cincinnati, OH

Clayton County, GA

Fairfax, OK

Gilbert, AZ

McKinney, TX

Madill, OK

Massena, NY

Merriam, KS

Middletown, OH

Mobile, AL

Phoenix, AZ

Rochester, MN

St. Paul, MN

Tucson, AZ

White Bear Lake, MN

How often do explosions happen? Known explosions in past 10 years

*Based on preliminary investigations in 16 states

slide15

“Houston, we have a problem”

- Captain James Lovell,

Spacecraft Commander of Apollo 13, 1970

slide16

The exposure is:

  • Low Frequency - High Severity
  • Short Term vs. Long Term
  • • A “predictable surprise”
so what should we do
So what should we do?
  • Plumbers
  • Academia
  • Legislators
  • Regulators
  • Contractors
  • Manufacturers
  • Owner/Operators
slide22

Story: March 16, 2006

After seeing bubbles in the water and smelling the natural gas, the plumber told the grandmother and her three grandchildren to get out of the home immediately.

• Middletown, Ohio building inspector:

"The plumber did absolutely nothing wrong. He had no way of knowing the gas line had been breached.”

slide23

Duke’s Verification Process

  • Plumber or Customer calls re: sewer blockage
  • Duke sends 1st responder to locate
    • No conflict – Plumber cleans sewer line
    • Potential conflict – Dispatch C&M crew to:
      • disconnect gas service and let plumber clean line
      • test and reconnect service
slide24

Academia

The Use of Trenchless Excavation Equipment in Relation to the Marking of Underground Facilities

2008

slide25

“How important is the issue of unmarked sewer

lines to your business?”

• 40 responses from major trenchless

contractors in the US

• Average Importance: 9.26 (10= high, 1= low)

legislators
Legislators
  • 40+ states already require some level of locating by the sewer owner/operator
    • Is that the home/building owner or municipality?
      • Courts have ruled that home/building owner does not have expertise to be responsible for location of sewer laterals.
    • Does the State require them to join the One-Call system?
legislators28
Legislators

Recent progress in AL, AZ, GA, KS, MN, NM, NV, SD, TN, VA, WI …

More can be done in most states

New installations

Replacement installations

Who is responsible for enforcement?

slide30

Does there need to be better enforcement of violators?

Need for better enforcement of violators

0%

Yes

No

100%

slide31

Manufacturers

  • 2005: 258 (5 per week) HDD hits in US
  • Potentially affecting HDD use
slide32

9th Annual HDD Survey

Growing Pains

Underground Construction, June 2007

slide34

Industry standards

  • HDD Consortium, Horizontal Directional Drilling - Good Practices Guidelines
  • EMI, Safety Manual: Directional Drilling Tracking Equipment
  • DCCA, Horizontal Drilling: Safe Operations Guidelines
  • NULCA, Excavation Practices & Procedures for Damage Prevention: A Guide For Protection of Underground Facilities
  • CNA, Minimum Damage Prevention Guidelines: Excavation Practices For Underground Facilities
  • Manufacturer’s Manuals
  • State One-Call Manuals
slide35

Sewer Line Conflict?

Yes / No, proceed

Daylighted?

No / Yes, proceed

Sewer Main

Sewer Laterals

NPL Policy #22, Process 2

Visually Verify Bore Clearance

No / Yes, proceed

NPL Policy #22, Process 3

Spaced Verification

No / Yes, proceed

STOP

Call Area Manager

www.gonpl.com

CONFIDENTIAL & PROPRIETARY

TRENCHLESS TECH UTILIZED

FOR

GAS LINE INSTALLATIONS

(Bore Card Required by Each Crew at Each Address)

Conflict is defined as either crossing a sewer line within 4’ or paralleling one within 4’.

Privately-Owned Sewer Systems (trailer park, school, etc.) require 100% daylight.

slide36

Owners/Operators

  • Reduction of risk can be achieved:
    • Formal program to address?
      • AGA Survey of 60 LDC’s: 26% have
    • Better policies
    • Relatively new technology for both new
    • and legacy installations
slide37

Do you want your contractor gambling?

Unmarked Sewer

Lines

Contractor’s

Contingency Plan

slide38

One LDC’s standard

  • Verification is required using any or all:
    • Check manholes for depth and direction
    • Fish tape with Sonde transmitter
    • Excavate 1’ > depth of lateral near start and end of bore
    • GPR, if it works
    • Camera before/after bore
  • Pre and post construction door hangers
slide40

Duke Energy’s sewer locate

& inspection process

New installations:

  • All sewer mains and laterals must be pre-located to the sidewalks
  • Curb-to-meter services are completed with open trench
  • Post Camera required before ANY GAS UP
  • All recordings are copied and sent to the local sewer district
  • Sewer Tag is attached to sewer cleanout
slide41

Duke Energy’s sewer locate

& inspection process

Replacement installations:

  • Site visit all projects
  • Determine if sewer is in the front
  • Determine depth of sewers and
  • Document elevation of first floor vs. street grade
  • Pre-locate sewer mains & laterals
  • Post-camera required before ANY GAS UP
    • 8 cross bores found out of 8000 pre-camera’d services
    • .1% vs .01% for a hole-in-one
slide42

Cost?

  • Less than 5% more
  • How do we justify not spending the $?
  • Is it worth one life?
slide43

Legacy solutions

  • Educate local plumbers, rental stores, mobile home park owners … to look before they root;
  • Find installed problems …before they find us.
slide44

Case study

Case study of an inspection program to inspect sewer mains and laterals for possible cross bores

  • 4 priorities identified:
    • Schools
    • Hospitals
    • Multi-Family
    • Mobile Home Parks
slide45

Susceptibility factors

  • Low depth of cover of the sewer lateral:
    • Privately-owned sewer systems
    • Areas with shallow sewer mains
      • Terraced homes
      • High water tables
      • Shallow or no basements
  • Areas where the gas line is buried deep
slide46

4 Methods used

  • Maps and Recordsfor elimination
    • Wherever evidence of open trench installation
    • Facilities installed after “no blind bore” policy began in March, 2002
  • Electronic separation
    • Electronically locate depth and run of sewer lateral and gas service/main
    • Separation greater than 18” required
  • Video past intersection point
    • Used ProPipe and Orbit to complete pilot
  • Dig and Inspect
    • As needed
slide47

Video inspection technology

  • ProPipe main and lateral camera launcher for 8” and larger lines
    • Range 1600’ (800’ each way) of sewer main and 80’ of sewer service
  • ProPipe hand-operated camera for 6” and smaller lines
    • Range 200 feet
  • Audio and video capable
slide50

Locating underway

The Launch

There it goes …

50

slide51

Hand-operated camera

for 8” and up

slide53

Pilot summary stats – 6/08

  • About 300,000 investigations
  • 103 cross bores found (.03%)
    • 76 found via the Program
    • 27 found by plumbers/Roto Rooter
  • 22,005 single family homes inspected with no cross bores
slide54

What’s next?

  • Proceed company wide:
    • All plastic services installed prior to 1992
    • All replaced/relocated services installed between 1992-2002 when new Policy started
    • Includes single family residences
    • Estimated completion: 5 years
  • Continue Public Education Program
    • Presentations to 132 residential and commercial plumbing contractors so far
    • Information mailed to all underground contractors
literature
Literature
  • Guidelines for locating pre-construction and verification post construction
  • Guidelines for Identification of Legacy Cross Bores
  • Sample Legacy Inspection Contract
  • Equipment manufacturers – notices
  • Sample ordinances
    • Requiring Drain Cleaner training
    • Requiring Accessibility to Sewer Maps

www.crossboresaftey.org

slide57

“Luck is not a strategy”

- Steve Ewing

Past Chairman AGA, Vice Chair, DTE

slide58

Goal: Protect all parties

Public

Plumbers

Academia

Legislators

Regulators

Contractors

Manufacturers

Owner/Operators