# NTSB Safety Recommendation P-77-005

**Citation:** P-77-005  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1977-06-08  
**Published:** 1977-06-08

DEVELOP GUIDELINES TO ASSIST OPERATORS DURING EMERGENCIES TO PROMPTLY ISOLATE LEAKING SEGMENTS OF PIPE IN A LOW-PRESSURE SYSTEM.

## Document text

NTSB safety recommendation P-77-005.

DEVELOP GUIDELINES TO ASSIST OPERATORS DURING EMERGENCIES TO PROMPTLY ISOLATE LEAKING SEGMENTS OF PIPE IN A LOW-PRESSURE SYSTEM.

Priority: CLASS III

Overall Status: Closed - Acceptable Action

Issued Date: 1977-06-08

Adopted Date: 1977-05-18

Overall Date Closed: 1985-07-29

Synopsis: ON AUGUST 8, 1976, A GAS EXPLOSION DESTROYED A HOUSE AT 1127 OAK STREET, ALLENTOWN, PENNSYLVANIA. THE GAS MIGRATED FROM A BREAK IN A 4-INCH CAST-IRON MAIN UNDER THE STREET, THROUGH LOOSE SOIL UNDER A CONCRETE SIDEWALK, AND INTO THE BUILDING THROUGH CRACKS AND OPENINGS IN ITS FOUNDATION.

Ntsbnumber: DCA76MP024

Report Number: PAR-77-02

Addressee Name: American Society of Mechanical Engineers

Addressee Status: Closed - Acceptable Action

Addressee Date Closed: 1985-07-29

Addressee Acronym: ASME

Addressee Organization Type: A-Associations

Communication Date: 1978-09-06

Communication Type: Official Correspondence

Communication Contents: ASME LTR: ASME-GPSC IS REVIEWING THIS RECOMMENDATION.

Addressee Acronym: ASME

Addressee Organization Type: A-Associations

Communication Date: 1985-07-29

Communication Type: Official Correspondence

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-77-005>
- Source ID: `ntsb-pipeline`
- SHA-256: `9c24e2e7d46131710f84a98563569a803cd965ade62613ad383090ba5dc7ace6`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-23T19:43:26.617Z
- Document slug: `ntsb-recommendation-p-77-005`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-77-005",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "DCA76MP024",
  "priority": "CLASS III",
  "overallStatus": "Closed - Acceptable Action",
  "overallStatusAcronym": "CAA",
  "overallDateClosed": "1985-07-29",
  "lastModifiedDate": "2016-11-15",
  "reportNumber": "PAR-77-02",
  "reportUrl": "https://www.ntsb.gov/investigations/Pages/DCA76MP024.aspx",
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P77_5.pdf",
  "addressees": [
    {
      "addresseeName": "American Society of Mechanical Engineers",
      "addresseeStatusAcronym": "CAA",
      "addresseeStatus": "Closed - Acceptable Action",
      "addresseeDateClosed": "1985-07-29",
      "addresseeDetails": [
        {
          "addresseeAcronym": "ASME",
          "addresseeOrganizationType": "A-Associations",
          "isFromNtsb": false,
          "communicationDate": "1978-09-06",
          "communicationType": "Official Correspondence",
          "communicationContents": "ASME LTR:  ASME-GPSC IS REVIEWING THIS RECOMMENDATION."
        },
        {
          "addresseeAcronym": "ASME",
          "addresseeOrganizationType": "A-Associations",
          "isFromNtsb": true,
          "communicationDate": "1985-07-29",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        },
        {
          "addresseeAcronym": "ASME",
          "addresseeOrganizationType": "A-Associations",
          "isFromNtsb": true,
          "communicationDate": "1978-05-01",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        }
      ]
    }
  ],
  "jurisdiction": "US"
}
```