# NTSB Safety Recommendation P-74-041

**Citation:** P-74-041  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1974-10-24  
**Published:** 1974-10-24

THE NTSB RECOMMENDS THAT THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS GAS PIPING STANDARDS COMMITTEE: DEVELOP GUIDELINES FOR THE SAMPLING OF COMBUSTIBLE GASES TO ASSURE PROPER CONCENTRATIONS OF ODORANT AS REQUIRED BY 49 CFR 192.625(F).

## Document text

NTSB safety recommendation P-74-041.

THE NTSB RECOMMENDS THAT THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS GAS PIPING STANDARDS COMMITTEE: DEVELOP GUIDELINES FOR THE SAMPLING OF COMBUSTIBLE GASES TO ASSURE PROPER CONCENTRATIONS OF ODORANT AS REQUIRED BY 49 CFR 192.625(F).

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1974-10-24

Adopted Date: 1974-10-24

Overall Date Closed: 1979-02-06

Synopsis: ON JUNE 23, 1973, A SERIES OF EXPLOSIONS, FOLLOWED BY FIRE, OCCURRED AT 12321 WELLING LANE IN BOWIE, MARYLAND. THREE OCCUPANTS OF THE HOUSE WERE KILLED, AND A FOURTH WAS INJURED; THE HOUSE WAS BADLY DAMAGED. HOUSES IN A FIVE-BLOCK AREA WERE EVACUATED.

Ntsbnumber: PLD73XR006

Report Number: PAR-74-05

Addressee Name: American Society of Mechanical Engineers

Addressee Status: Closed--No Longer Applicable

Addressee Date Closed: 1979-02-06

Addressee Acronym: ASME

Addressee Organization Type: A-Associations

Communication Date: 1978-09-06

Communication Type: Official Correspondence

Communication Contents: ASME LTR: GUIDE MATERIAL FOR THIS RECOMMENDATION WAS ADOPTED UNDER 192.625 AND WAS PUBLISHED IN THE GUIDE FEBRUARY 1978, ADDENDA NO. 11.

Addressee Acronym: ASME

Addressee Organization Type: A-Associations

Communication Date: 1978-05-01

Communication Type: Official Correspondence

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/carol-main-public/sr-details/P-74-041>
- Source ID: `ntsb-pipeline`
- SHA-256: `6759eb61d040a1b1f71ff0cdcfdb9d79fe2fe5c23255f48774e7eb01850b23ad`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-22T05:37:11.988Z
- Document slug: `ntsb-recommendation-p-74-041`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-74-041",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "PLD73XR006",
  "priority": "CLASS II",
  "overallStatus": "Closed - Acceptable Action",
  "overallStatusAcronym": "CAA",
  "overallDateClosed": "1979-02-06",
  "lastModifiedDate": "2016-11-15",
  "reportNumber": "PAR-74-05",
  "reportUrl": "https://www.ntsb.gov/investigations/Pages/PLD73XR006.aspx",
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P74_37_49.pdf",
  "addressees": [
    {
      "addresseeName": "American Society of Mechanical Engineers",
      "addresseeStatusAcronym": "CNLA",
      "addresseeStatus": "Closed--No Longer Applicable",
      "addresseeDateClosed": "1979-02-06",
      "addresseeDetails": [
        {
          "addresseeAcronym": "ASME",
          "addresseeOrganizationType": "A-Associations",
          "isFromNtsb": false,
          "communicationDate": "1978-09-06",
          "communicationType": "Official Correspondence",
          "communicationContents": "ASME LTR: GUIDE MATERIAL FOR THIS RECOMMENDATION WAS ADOPTED UNDER 192.625 AND WAS PUBLISHED IN THE GUIDE FEBRUARY 1978, ADDENDA NO. 11."
        },
        {
          "addresseeAcronym": "ASME",
          "addresseeOrganizationType": "A-Associations",
          "isFromNtsb": true,
          "communicationDate": "1978-05-01",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        }
      ]
    }
  ],
  "jurisdiction": "US"
}
```