# NTSB Safety Recommendation P-74-028

**Citation:** P-74-028  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1974-08-28  
**Published:** 1974-08-28

THE NTSB RECOMMENDS THAT THE OFFICE OF PIPELINE SAFETY OF THE DEPARTMENT OF TRANSPORTATION: REQUIRE THE MID AMERICA PIPELINE COMPANY TO IMPLEMENT IMMEDITELY CORRECTIVE MEASURES IN PIPELINE CONTROLS, PROTECTIVE EQUIPMENT, AND METHODS OF OPERATIONS, TO ASSURE THAT THE MAXIMUM OPERATING PRESSURE ESTABLISHED FOR THIS PIPELINE IS NOT EXCEEDED.

## Document text

NTSB safety recommendation P-74-028.

THE NTSB RECOMMENDS THAT THE OFFICE OF PIPELINE SAFETY OF THE DEPARTMENT OF TRANSPORTATION: REQUIRE THE MID AMERICA PIPELINE COMPANY TO IMPLEMENT IMMEDITELY CORRECTIVE MEASURES IN PIPELINE CONTROLS, PROTECTIVE EQUIPMENT, AND METHODS OF OPERATIONS, TO ASSURE THAT THE MAXIMUM OPERATING PRESSURE ESTABLISHED FOR THIS PIPELINE IS NOT EXCEEDED.

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1974-08-28

Adopted Date: 1974-08-28

Overall Date Closed: 1976-09-10

Synopsis: TWO ANHYDROUS AMMONIA PIPELINE ACCIDENTS HAVE OCCURRED ON AN 8-INCH PIPELINE OWNED AND OPERATED BY MID AMERICA PIPE LINE COMPANY (MAPCO). ON DECEMBER 6, 1973, A MAPCO PIPELINE FAILED NEAR CONWAY, KANSAS, IN A SECTION OF PIPELINE WHICH HAD BEEN DAMAGED PREVIOUSLY. ON AUGUST 13, 1974, THE SAME MAPCO PIPELINE FAILED NEAR HUTCHINSON, KANSAS. THIS FAILURE WAS ALMOST IDENTICAL TO THE FIRST AND WAS ONLY 23 MILES AWAY.

Ntsbnumber: PLD74XR003

Report Number: None

Addressee Name: RSPA

Addressee Status: Closed - Acceptable Action

Addressee Date Closed: 1976-09-10

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/carol-main-public/sr-details/P-74-028>
- Source ID: `ntsb-pipeline`
- SHA-256: `9757c619fbdf52577f3441c8f0e6e97117830b106a56868305b9b7cf342244b6`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-23T14:51:53.911Z
- Document slug: `ntsb-recommendation-p-74-028`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-74-028",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "PLD74XR003",
  "priority": "CLASS II",
  "overallStatus": "Closed - Acceptable Action",
  "overallStatusAcronym": "CAA",
  "overallDateClosed": "1976-09-10",
  "lastModifiedDate": "2016-11-15",
  "reportNumber": "None",
  "reportUrl": null,
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P74_28.pdf",
  "addressees": [
    {
      "addresseeName": "RSPA",
      "addresseeStatusAcronym": "CAA",
      "addresseeStatus": "Closed - Acceptable Action",
      "addresseeDateClosed": "1976-09-10",
      "addresseeDetails": []
    }
  ],
  "jurisdiction": "US"
}
```