# Definitions

**Citation:** Mich. Admin. Code R 460.20102  
**Type / status:** regulation / current  
**Agency:** Michigan Public Service Commission  
**Effective:** 2026-05-04  
**Published:** Not stated

Rule 102. As used in these rules: (a) "Commission" means the Michigan public service commission. (b) "Corrosion" means the destruction or deterioration of a material, usually a metal, by an electrochemical process, due to a reaction with the material's environment. (c) "Customer" means a person or c

## Document text

Rule 102. As used in these rules:

(a) "Commission" means the Michigan public service commission.

(b) "Corrosion" means the destruction or deterioration of a material, usually a metal, by an electrochemical process, due to a reaction with the material's environment.

(c) "Customer" means a person or company who purchases gas from a distributor for the person's or company's own use or for the use of a tenant, or both.

(d) "Hoop stress" means the stress in a pipe wall which acts circumferentially in a plane perpendicular to the longitudinal axis of the pipe and which is produced by the pressure of the fluid in the pipe.

(e) "Leak" means the unintentional escape of gas from a pipeline facility or a customer's facility.

(f) "Leakage survey" means a systematic inspection that is made to locate leaks in a gas pipeline.

(g) "Pressure" means gauge pressure, unless otherwise stated, expressed in pounds per square inch above atmospheric pressure and is abbreviated "psig."

(h) "Sour gas" means gas containing a concentration of hydrogen sulfide (H2S) greater than or equal to 300 parts per million (ppm.).

(i) "System" means all pipeline facilities used by a particular operator in the transportation of gas, including all of the following:

(A) Line pipe.

(B) Valves.

(C) Other appurtenances connected to line pipe.

(D) Compressor units.

(E) Fabricated assemblies associated with compressor units.

(F) Metering.

(G) Customers' meters.

(H) Delivery stations.

(I) Fabricated assemblies in metering and delivery stations.

(j) "Vault" means an underground structure that may be entered and that is designed to contain piping and piping components, such as valves and pressure regulators. The terms "vault"and "pit" are used interchangeably in these rules.

History: 1998-2000 AACS.

## Provenance

- Official: Yes
- Source: <https://ars.apps.lara.state.mi.us/AdminCode/DownloadAdminCodeFile?FileName=R%20460.20101%20to%20R%20460.20606.pdf>
- Source ID: `mi-ars-gas-safety`
- SHA-256: `47088a678b4b9f3051ca9c524fa4ecc940de924793243a48bd8c2fdb2eaa58b2`
- Retrieved: 2026-08-20T08:33:06.234Z
- Exported: 2026-08-23T11:04:04.985Z
- Document slug: `mi-admin-code-r-460-20102`

### Source metadata

```json
{
  "jurisdiction": "US-MI",
  "rule": "R 460.20102",
  "part": "1",
  "partTitle": "GENERAL PROVISIONS",
  "edition": 27,
  "editionEffectiveOn": "2026-05-04",
  "corpusScope": "complete-current-dedicated-michigan-gas-safety-standards",
  "inventoryCount": 81,
  "currentRuleCount": 78,
  "references": [],
  "federalReferences": [],
  "stateReferences": [],
  "statutoryAuthority": [
    "1969 PA 165",
    "MCL 483.152"
  ],
  "hazardousLiquidCoverage": false,
  "scopeCaveat": "This connector is the complete current dedicated Michigan Administrative Code Gas Safety corpus published by ARS/MOAHR from R 460.20101 through R 460.20606. It does not claim all Michigan utility, siting, excavation-damage-prevention, well, environmental, federal, local, or Commission order law. Three headings expressly marked rescinded are retained only in the verified inventory. The MPSC pipeline-safety program does not regulate hazardous-liquid pipelines, and this corpus must not be used to imply that it does.",
  "applicabilityCaveat": "Applicability depends on the definitions and exclusions in R 460.20101 and R 460.20102, MPSC jurisdiction, gas and facility type, intrastate or interstate status, gathering-line classification, operator status, waivers, federal preemption, and rule-specific conditions. MPSC inspects jurisdictional intrastate gas systems and acts as an interstate agent for inspections and investigations; PHMSA retains interstate enforcement authority. MPSC expressly states that its pipeline-safety program lacks hazardous-liquid-pipeline jurisdiction.",
  "incorporationCaveat": "The rules adopt specified editions of 49 CFR parts 40, 191, 192, and 199 and named API, ASME, and NACE/ISO standards. References metadata does not reproduce incorporated material, update a fixed edition, determine whether a provision is superseded, or grant rights in third-party standards. Verify the exact edition and any Michigan additions, exceptions, or superseding language in the current official sources.",
  "publicationCaveat": "The rule text comes from the current ARS/MOAHR Michigan Administrative Code download. The MPSC identifies it as the 27th edition effective May 4, 2026. Historical Guide to the Michigan Gas Safety Standards files, including the 25th edition guide, are not current rule artifacts and are not used by this connector.",
  "rights": "Michigan administrative rule text is official legal material and is preserved with ARS/MOAHR and MPSC attribution. Public availability does not resolve rights in agency seals, site presentation, incorporated federal compilations, API, ASME, NACE/ISO standards, forms, or other third-party material; downstream redistribution requires separate rights review.",
  "rightsReviewRequired": true,
  "region": "MI"
}
```