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SoCalGasStandardsResponsetoViolation2015.pdf

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:

Subpart B –

Materials Section 192.55 – Steel Pipe Section 192.59 – Plastic Pipe

Subpart C – Design Section 192.105 – Design formula for Steel Pipe Section 192.121 – Design of Plastic Pipe

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

Subpart F – Joining of Materials other than by Welding Section 192.281 – 287 – Plastic pipe joining 

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

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

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

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

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

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

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WATER

ELECTRICAL

GAS MAIN

GAS SERVICE

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MINIMAL SEPARATION

MIRROR

  • CPUC MHP OIR – Applicable Gas Standards�
  • CPUC MHP OIR – Applicable Gas Standards�
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  • CPUC MHP OIR – MHP EXAMPLES�
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