ethics essay
CPUC MHP OIR SDG&E/SoCalGas
Gas Standards
June 14, 2011
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CPUC MHP OIR –
Applicable Gas Standards
•
As adopted by General Order 112‐E, the following DOT CFR Title 49 Part 192
sections , although not inclusive, are the regulatory standards covering
natural gas pipeline construction applicable to MHP transfers:
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Subpart B –
Materials Section 192.55 – Steel Pipe Section 192.59 – Plastic Pipe
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Subpart C – Design Section 192.105 – Design formula for Steel Pipe Section 192.121 – Design of Plastic Pipe
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Subpart E – Welding of Steel in Pipelines Section 192.225 – Welding procedures Section 192.227 – Qualification of welders Section 192.241 – Inspection and test of welds
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Subpart F – Joining of Materials other than by Welding Section 192.281 – 287 – Plastic pipe joining
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Subpart G – General Construction Requirements for Transmission lines and Mains Section 192.309 – Repair of steel pipe Section 192.311 – Repair of plastic pipe Section 192.319 – Installation of pipe in a ditch Section 192.321 – Installation of plastic pipe Section 192.325 – Underground Clearance Section 192.327 – Cover
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CPUC MHP OIR –
Applicable Gas Standards
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Subpart H – Customer Meters, Service Regulators, and Service Lines Section 192.353 – 357 – Customer meter and regulator: Location, Protection, and Installation Section 192.361 – Service lines: Installation Section 192.367 – Service lines: General requirements for connections to main piping Section 192.371 – Service lines: Steel Section 192.375 – Service lines: Plastic Section 192.383 – Excess flow valve installation
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Subpart I –
Requirements for Corrosion Control Section 192.465 – External corrosion control: Monitoring Section 192.477 – Internal corrosion control: Monitoring Section 192.481 – Atmospheric corrosion control: Monitoring
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Subpart M –
Maintenance Section 192.723 – Distribution Systems: Leakage surveys
•
To facilitate tool, maintenance, and repair consistency and to minimize costs, gas
facility standardization is stressed regarding pipe material, diameter, and design. •
Non‐standard facilities require additional consideration and special
arrangements that are
not desired.
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CPUC MHP OIR –
Applicable Gas Standards
•
SDG&E and SoCalGas have internal procedures that are more clearly defined than the
DOT CFR Title 49 Part 192 (namely pipe clearance, cover, joint trenching and meter
location) and must be complied with per CPUC.
–
Clearance SDGE ‐ minimum of 12” radial separation from all utilities (D7403) SoCalGas – requires a minimum 12” radial separation from power, gas transmission, or sources of heat and 6” radial separation from all other substructures (184.0095)
–
Cover Gas Main – Public and Private Property
SDGE – 30” minimum and 42” maximum from final grade SoCalGas – 30” minimum from final street flow line
Gas Service – Private Property SDGE – 24” minimum and 30” maximum from final grade SoCalGas – 20” in private for direct burial SoCalGas – Public Property Service – 24” minimum SoCalGas – Steel Casing – 24” minimum in public, 12” minimum in private
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Joint Trench No Wet Utilities (water, sewer, storm drain) in dry utility (cable, gas, power, Telco) trench For main, wet utility trench must have a minimum 5’ separation and 3’ of undisturbed soil separation from the dry utility trench For services, wet utility trench must have a minimum of 12” of undisturbed soil separation from the dry utility trench
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CPUC MHP OIR –
Applicable Gas Standards
•
Gas Meter Location In general, the recommended meter location is located outside, adjacent to the serving structure with no structure opening within 3’ of the MSA. (D‐7103) (185.0001) For Mobile Home installations, »
At or near the corner of the mobile home or the mobile
home lot closest to the utility's source »
On a permanently installed structure near the front lot
line of the mobile home lot »
The MSA may not be supported solely by the gas flex
connector to the mobile home. A customer provided,
utility approved bracket, post or support is required »
A minimum of 18”
horizontal clearance shall be
maintained on all sides of the gas meter excluding the
gas riser and support post. »
A minimum of 12”
horizontal clearance from the riser
and gas meter support »
A minimum of 3’
horizontal working space in front of
the meter set assembly is required for
service/maintenance »
Ballard/Damage Prevention may be required if potential
damage exists – evaluated on‐site and on a case by case
basis
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CPUC MHP OIR –
Applicable Gas Standards
General Pipe Design Considerations
•
Gas piping must be underground
•
Gas piping must not be located below dwelling units or have
structures built over the pipeline •
Gas piping must be comprised of utility approved materials
•
Gas main piping should be installed along public or private
roads •
Easements are required for all gas lines that cross between
private property – “cross lot”
installations •
Access to gas facilities is required to perform maintenance,
repair, and emergency operations
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CPUC MHP OIR –
Current AB 622 MHP Transfer Process
SoCalGas Gas Standard 144.0132 outlines the MHP transfer
process and adheres to the guidelines set forth in sections 2791 through 2799
4 Primary phases –
Notification MHP Owner submits request and required records, preliminary MHP review to determine if MHP meets the AB 622 qualifications
–
Feasibility On‐Site inspection, depth and clearance checks, system design and code compliance, determination of transfer or replacement requirement, existing system valuation, easements, and contract
–
Construction If accepted and paid, field construction, service application and transfer of facility occurs
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Completion Project reconciliation and facility valuation payment to MHP
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CPUC MHP OIR –
MHP EXAMPLES
The following slides, although not a general statement or indicative of the overall condition of mobile home park owned facilities in the SDGE or SoCalGas territories, represent examples of privately operated gas systems encountered over the years
Above Ground Gas Mains and Gas Services
Above Ground Gas Mains and Gas Services
Above Ground Gas Main
Lack of Gas Meter Working Clearance and Permanent Support
Water too close
Non Standard Joining of Two Pipe Sizes for
Gas Main
Non-compliant Gas Pipe Support
Above Ground Gas Main
Lack of Working Clearance For Gas Regulator
Lack of Gas Meter Working Clearance
Unsupported Meter
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ADDITIONAL MHP EXAMPLES
The following slides are from a recent leak investigation excavation at a CPUC mandated MHP gas facility transfer to SoCalGas. It was ruled and
determined that the system was able to safely deliver gas and therefore met the MINIMUM transfer
requirements
No visual substructure evidence was submitted during the determination
Acceptable Meter Location
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EXCAVATION SITE
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CLOSE UP VIEW OF EXCAVATION SITE
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HERE IS
WHAT WE
FOUND BELOW
GROUND
REQUIRE 30”
COVER
REQUIRE 20”
COVER
REQUIRE 12”
OF SEPARATION
REQUIRE 6”
OF SEPARATION
WATER IN TRENCH
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INSUFFICIENT COVER AND SEPARATION
WATER
25
WATER
ELECTRICAL
GAS MAIN
GAS SERVICE
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MINIMAL SEPARATION
MIRROR
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- CPUC MHP OIR – Applicable Gas Standards�
- CPUC MHP OIR – Applicable Gas Standards�
- CPUC MHP OIR – Applicable Gas Standards�
- CPUC MHP OIR – Applicable Gas Standards�
- CPUC MHP OIR – Applicable Gas Standards�
- CPUC MHP OIR – Current AB 622 MHP Transfer Process�
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- CPUC MHP OIR – MHP EXAMPLES�
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- ADDITIONAL MHP EXAMPLES�
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