# Definition of Terms

**Citation:** COMAR 20.56.01.02  
**Type / status:** regulation / current  
**Agency:** Maryland Public Service Commission  
**Effective:** Not stated  
**Published:** Not stated

Maryland pipeline-safety provision COMAR 20.56.01.02, Definition of Terms.

## Document text

A. In this subtitle, the following terms have the meanings indicated.

B. Terms Defined.

(1) “Accident” has the meaning stated in Public Utility Companies Article, §5-304, Annotated Code of Maryland.

(2) “Accuracy” means the degree of conformity of a measure to a standard or true value.

(3) “Associated metering device” means an instrument used to adjust the quantity of gas measured by a meter, based on the measurement of the:

(a) Temperature of the gas passing through the meter;

(b) Pressure of the gas passing through the meter; or

(c) Temperature and pressure of the gas passing through the meter.

(4) “Check flow” means a flow of gas at 20—50 percent of the rated capacity of a meter.

(5) “Commission” means the Public Service Commission of Maryland.

(6) “Full rated flow” means a flow of gas at approximately 100 percent of the rated capacity of a meter.

(7) “Gas” means LPG in the vapor state.

(8) “LPG” means liquified petroleum gas which includes propane, or butane, or other combustible gases, or mixtures thereof.

(9) “LPG system” means an LPG service installation located in Maryland that provides service to:

(a) Ten or more customers by underground pipes from a LPG storage tank; or

(b) At least two but fewer than ten customers by underground pipes from a LPG storage tank, if a portion of the LPG system is located in a public place.

(10) “Meter” means a device used by an owner to measure a quantity of gas.

(11) “Owner” means the person, as defined in Public Utilities Article, §1-101, Annotated Code of Maryland, owning the LPG system.

## Provenance

- Official: Yes
- Source: <https://regs.maryland.gov/us/md/exec/comar/20.56.01.02>
- Source ID: `maryland-comar`
- SHA-256: `bc4abd51abde0c2fa7fff1235710697cd40becde65bb668887002a8f73cee6a7`
- Retrieved: 2026-08-20T08:47:37.108Z
- Exported: 2026-08-23T16:22:37.605Z
- Document slug: `md-comar-20-56-01-02`

### Source metadata

```json
{
  "jurisdiction": "US-MD",
  "commodity": [
    "liquefied-petroleum-gas"
  ],
  "legalScope": "Bounded Maryland PSC pipeline-safety rules in COMAR 20.55-20.57.",
  "applicabilityCaveat": "Maryland PSC enforcement under PHMSA certification is limited to intrastate gas and hazardous-liquid pipeline operators and applicable LPG systems. PHMSA retains inspection and enforcement responsibility for interstate gas and hazardous-liquid pipelines. Coverage also depends on operator class, gas-company or master-meter status, facility and commodity definitions, exemptions, waivers, and federal preemption.",
  "incorporationCaveat": "Maryland provisions use both fixed editions of private or federal guidance and prospective phrases such as 'as amended' for federal statutes and 49 CFR. This connector preserves the consolidated Maryland text retrieved on the stated date but does not infer that every later federal amendment is incorporated for every legal purpose. Verify the controlling Maryland incorporation rule, federal edition, and event date.",
  "publicationCaveat": "The Library of Maryland Regulations is the official consolidated access system, but the Maryland Register and filed rulemaking record control adoption history. Administrative-history notes are evidence aids, not substitutes for the promulgation record. The PSC program description is dated September 2011 and is used only to corroborate program scope, not current rule text.",
  "rightsCaveat": "Official Maryland and federal legal-source captures are preserved with attribution and hashes. State presentation, seals, site software, and incorporated private standards may carry separate rights; incorporated standards are referenced but not reproduced by this connector.",
  "references": [],
  "region": "MD"
}
```