# NTSB Safety Recommendation P-74-050

**Citation:** P-74-050  
**Type / status:** guidance / guidance  
**Agency:** National Transportation Safety Board  
**Effective:** 1974-11-11  
**Published:** 1974-11-11

THE NTSB RECOMMENDS THAT THE OFFICE OF PIPELINE SAFETY OF THE DEPARTMENT OF TRANSPORTATION: IN ITS UPCOMING RULEMAKING ACTION FOR THE TRANSPORTATION OF HIGHLY VOLATILE, TOXIC, OR CORROSIVE LIQUIDS, INCLUDE ANHYDROUS AMMONIA PIPELINE SYSTEMS. PARTICULAR EMPHASIS SHOULD BE PLACED ON A REDUCTION OF THE MAXIMUM ALLOWABLE PRESSURES FOR NH3 SYSTEMS, MORE CLOSELY SPACED VALVES, AND MORE REMOTELY OR AUTOMATICALLY OPERATED VA

## Document text

NTSB safety recommendation P-74-050.

THE NTSB RECOMMENDS THAT THE OFFICE OF PIPELINE SAFETY OF THE DEPARTMENT OF TRANSPORTATION: IN ITS UPCOMING RULEMAKING ACTION FOR THE TRANSPORTATION OF HIGHLY VOLATILE, TOXIC, OR CORROSIVE LIQUIDS, INCLUDE ANHYDROUS AMMONIA PIPELINE SYSTEMS. PARTICULAR EMPHASIS SHOULD BE PLACED ON A REDUCTION OF THE MAXIMUM ALLOWABLE PRESSURES FOR NH3 SYSTEMS, MORE CLOSELY SPACED VALVES, AND MORE REMOTELY OR AUTOMATICALLY OPERATED VALVES.

Priority: CLASS II

Overall Status: Closed - Unacceptable Action

Issued Date: 1974-11-11

Adopted Date: 1974-11-11

Overall Date Closed: 1985-08-19

Synopsis: ON DECEMBER 6, 1973, A PIPELINE RUPTURED IN A RURAL AREA IN KANSAS, AND RELEASED 2,138 BARRELS OF ANHYDROUS AMMONIA, A VOLATILE, TOXIC MATERIAL. TWO PERSONS WHO HAD DRIVEN THROUGH THE AMMONIA VAPORS WERE HOSPITALIZED WITH BURNS TO THE EYES, NOSE, THROAT, AND LUNGS.

Keywords: Hazmat

Ntsbnumber: PLD74XR002

Report Number: PAR-74-06

Addressee Name: RSPA

Addressee Status: Closed - Unacceptable Action

Addressee Date Closed: 1985-08-19

Addressee Acronym: RSPA

Addressee Organization Type: G-Federal Government

Communication Date: 1975-01-21

Communication Type: Official Correspondence

Communication Contents: MEMO FROM OFFICE OF PIPELINE SAFETY: THE CONTRACT STUDY BEING PERFORMED INCLUDES CONSIDERATION OF THE SUBJECT THIS RECOMMENDATION. ANY RULE MAKING ACTION TAKEN WILL INCLUDE CONSIDERATION OF ADOPTING SPECIFIC REQUIREMENTS FOR SPECIFIC TYPES OF HAZARDOUS LIQUIDS SUCH AS ANHYDROUS AMMONIA. 2/9/76 - STUDY COMPLETED; UNDER REVIEW BY OPSO. 4/3/78 - DISCUSSED AT QUARTERLY MEETING. NH3 TO BE INCLUDED IN LPG RULEMAKING ACTION. 8/10/78 NPRM ISSUED INCLUDING DEFINITION OF HIGHLY VOLTILE LIQUID.

Addressee Acronym: RSPA

Addressee Organization Type: G-Federal Government

Communication Date: 1985-08-19

Communication Type: Official Correspondence

## Provenance

- Official: Yes
- Source: <https://data.ntsb.gov/carol-main-public/sr-details/P-74-050>
- Source ID: `ntsb-pipeline`
- SHA-256: `e2d8afcad820769d8a407d1b25df3c8e8f97c538fab0033c64bbaab38c0fe6d4`
- Retrieved: 2026-08-20T04:57:24.741Z
- Exported: 2026-08-22T22:50:32.825Z
- Document slug: `ntsb-recommendation-p-74-050`

### Source metadata

```json
{
  "recordKind": "ntsb_safety_recommendation",
  "safetyRecommendationNumber": "P-74-050",
  "recommendationMode": "Pipeline",
  "topicMode": "Pipeline",
  "ntsbNumber": "PLD74XR002",
  "priority": "CLASS II",
  "overallStatus": "Closed - Unacceptable Action",
  "overallStatusAcronym": "CUA",
  "overallDateClosed": "1985-08-19",
  "lastModifiedDate": "2023-08-30",
  "reportNumber": "PAR-74-06",
  "reportUrl": "https://www.ntsb.gov/investigations/Pages/PLD74XR002.aspx",
  "transmittalLetterUrl": "http://www.ntsb.gov/safety/safety-recs/recletters/P74_50_58.pdf",
  "addressees": [
    {
      "addresseeName": "RSPA",
      "addresseeStatusAcronym": "CUA",
      "addresseeStatus": "Closed - Unacceptable Action",
      "addresseeDateClosed": "1985-08-19",
      "addresseeDetails": [
        {
          "addresseeAcronym": "RSPA",
          "addresseeOrganizationType": "G-Federal Government",
          "isFromNtsb": false,
          "communicationDate": "1975-01-21",
          "communicationType": "Official Correspondence",
          "communicationContents": "MEMO FROM OFFICE OF PIPELINE SAFETY: THE CONTRACT STUDY BEING PERFORMED INCLUDES CONSIDERATION OF THE SUBJECT THIS RECOMMENDATION. ANY RULE MAKING ACTION TAKEN WILL INCLUDE CONSIDERATION OF ADOPTING SPECIFIC REQUIREMENTS FOR SPECIFIC TYPES OF HAZARDOUS LIQUIDS SUCH AS ANHYDROUS AMMONIA. 2/9/76 - STUDY COMPLETED; UNDER REVIEW BY OPSO. 4/3/78 - DISCUSSED AT QUARTERLY MEETING. NH3 TO BE INCLUDED IN LPG RULEMAKING ACTION. 8/10/78 NPRM ISSUED INCLUDING DEFINITION OF HIGHLY VOLTILE LIQUID."
        },
        {
          "addresseeAcronym": "RSPA",
          "addresseeOrganizationType": "G-Federal Government",
          "isFromNtsb": true,
          "communicationDate": "1985-08-19",
          "communicationType": "Official Correspondence",
          "communicationContents": ""
        }
      ]
    }
  ],
  "jurisdiction": "US"
}
```