by roger c. carson ii operating supervisor, con edison...by roger c. carson ii operating supervisor,...
TRANSCRIPT
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CH4 ConnectionsWhat’s Going on Underground?
By Roger C. Carson II
Operating Supervisor, Con Edison
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2
Agenda
• Con Edison Gas System Overview
• Leak Detection
• Leak Response Time
• Gas Leak Backlog Management
• Leak Pinpointing
• So What’s Going on Underground?
• Type 3 Example
• Type 1 Example
• Follow Up
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3
Con Edison System Overview
• System
– ~ 4300 mi – Distribution
– ~ 100 mi - Transmission
• System Materials:
– Cast Iron (~24%)
– Steel (~30%)
• Unprotected (~22%)
• Protected (~8%)
– Wrought Iron (Less than 1%)
– Plastic (~46%)
• 1.1 Million Customers
LEGENDTP > 125 PSIG
HP 15 – 99 PSIG
MP 2 – 15 PSIG
LP 4 – 12 in WC
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Leak Detection How we Receive leaks
• Leak Survey
– Monthly Survey
– Company/Contractor
– Heath Detecto-Pak Infrared (DP-IR)
– Picarro
– ABB MobileGuard
• Natural Gas Detector
• Public
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Leak Detection How we Receive leaks
• Leak Survey
– Monthly Survey
– Company/Contractor
– Heath Detecto-Pak Infrared (DP-IR)
– Picarro
– ABB MobileGuard
• Natural Gas Detector
• Public
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Leak Detection How we Receive leaks
• Leak Survey
– Monthly Survey
– Company/Contractor
– Heath Detecto-Pak Infrared (DP-IR)
– Picarro
– ABB MobileGuard
• Natural Gas Detector
• Public
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Leak Detection How we Receive leaks
• Leak Survey
– Monthly Survey
– Company/Contractor
– Heath Detecto-Pak Infrared (DP-IR)
– Picarro
– ABB MobileGuard
• Natural Gas Detector
• Public
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Leak Detection (cont.)Public Awareness Campaigns
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Leak Detection (cont.)
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37%
63%
Incoming Leak Source
Public Company
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Leak Response Time
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65.60%
67.70%
71.90%
76%76.40%
78.40%80.20%80.80%80.80%
81.80%83.55%
87.57%88.89%
87.80%88.24%89.10%
89.96%
91.95%
94.10%
60.00%
65.00%
70.00%
75.00%
80.00%
85.00%
90.00%
95.00%
100.00%
20000
25000
30000
35000
40000
45000
50000
55000
60000
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
30 min response # calls
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Gas Leak Backlog Management
11
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
2000
1992 - 2018
Le
aks
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Gas Leak Backlog Management (cont.)Average time to Repair
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Gas Leak Backlog Management (cont.)Multi-Faceted Approach
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Efforts: • Monthly mobile
leak survey• Public awareness
campaigns• Residential
methane detectors development and deployment
Detection Response
Efforts: • Code MuRRE• Make safe• Isolation valve
installation program
• Repair Type 3 leaks
Prevention
Efforts:• Main
replacement program leak prone pipe
• One-call, Dig safe • Training• Work
coordination with city utilities
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Leak Pinpointing Factors to consider to determine leak source
• Road Conditions
– Road Composition
– Soil Type & Moisture
– Existing Utilities/Crossings
– Grade
– Unique Features
– Vegetation
• Pipe
– Material
– Existing Repairs
– Pressure
– Cover
– Odor
• Weather
– Frost
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Asphalt
Soil
Asphalt
Soil
Concrete
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So What’s Going on Underground?Wall St and William St
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So What’s Going on Underground? (cont.)Wall St and William St
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Type 3 Example
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Type 3 Example
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GMI
Pogo
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Type 3 Example (cont.)
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~62’
28%
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Type 3 Example (cont.)
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~62’
28%
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Type 3 Example (cont.)
• Main:
– 10” HPST 1971
• Road Makeup:
– Asphalt
– Concrete
– Earth
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BarholesTest Point
0%
28%
25%
15%
0%
60%
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Type 3 Example (cont.)
• Main:
– 10” HPST 1971
• Road Makeup:
– Asphalt
– Concrete
– Earth
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Aerator
Highest
Reading
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Type 3 Example (cont.)
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Highest
Reading
4x4
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Type 3 Example (cont.)
• Main:
– 10” HPST 1971
• Road Makeup:
– Asphalt
– Concrete
– Earth
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• Reason for Leak:
– Corrosion
• Repair:
– Fullseal Clamp
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TYPE 1 Example
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Manhole 11%
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TYPE 1 Example
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Manhole 11%
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Type 1 Example (cont.)
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Potable Water
Manhole 11%
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Type 1 Example (cont.)
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Potable Water
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Type 1 Example (cont.)
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Sustained ~60’s
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Type 1 Example (cont.)
• Main:
– 16” MPCI 1917
• Road Makeup:
– Asphalt
– Concrete
– Earth/Rock
• Reason for Leak:
– Bell & Spigot Joint
• Repair:
– Encapsulation
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Type 1 Example (cont.)
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Potable Water
Readings
Clear
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Type 1 Example (cont.)
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Sustained
Readings
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Type 1 Example (cont.)
• Main:
– 6” LPCI 1904
• 1” Steel Riser
• Road Makeup:
– Asphalt
– Concrete
– Earth/Rock
• Reason for Leak:
– Corrosion on Riser
• Repair:
– Replace Riser
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Type 1 Example (cont.)
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Encapsulate
Joint
Replace Riser
Potable Water
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Follow Up
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• Type 1, 2A/M, 2’s require a recheck of test points
• After 14 days within 30
• GDS does the recheck