# NTSB Safety Recommendation P-77-025

- **operation:** document
- **citation:** P-77-025
- **title:** NTSB Safety Recommendation P-77-025
- **source type:** guidance
- **agency:** National Transportation Safety Board
- **status:** guidance
- **official:** true
- **published on:** 1977-09-27
- **effective on:** 1977-09-27
- **summary:** INSTRUCT ITS CREWS TO ASCERTAIN POSITIVELY BY ALL POSSIBLE MEANS THE TYPE AND SIZE OF EXISTING GAS LINE FACILITIES BEFORE WORKING ON THEM.
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- **source url:** https://data.ntsb.gov/carol-main-public/sr-details/P-77-025
**body:**

NTSB safety recommendation P-77-025.

INSTRUCT ITS CREWS TO ASCERTAIN POSITIVELY BY ALL POSSIBLE MEANS THE TYPE AND SIZE OF EXISTING GAS LINE FACILITIES BEFORE WORKING ON THEM.

Priority: CLASS II

Overall Status: Closed - Acceptable Action

Issued Date: 1977-09-27

Adopted Date: 1977-09-16

Overall Date Closed: 1978-11-21

Synopsis: ON MAY 25, 1977, AN EXPLOSION AND FIRE DESTROYED A BUILDING AT 65-67 ARCH STREET IN GREENWICH, CONNECTICUT. TWO ADJACENT BUILDINGS WERE ALSO DESTROYED AND ANOTHER BUILDING WAS HEAVILY DAMAGED. FIREMEN EVACUATED RESIDENTS FROM A TWO-BLOCK AREA 30 MINUTES AFTER THE EXPLOSION. TEN PERSONS REQUIRED MEDICAL TREATMENT FOR INJURIES CAUSED BY THE ACCIDENT.

Ntsbnumber: DCA77FP024

Report Number: None

Addressee Name: Connecticut Natural Gas Corporation

Addressee Status: Closed--No Longer Applicable

Addressee Date Closed: 1978-11-21

Addressee Acronym: CNG

Addressee Organization Type: S-State Government

Communication Date: 1977-10-13

Communication Type: Official Correspondence

Communication Contents: CONNECTICUT NATURAL GAS CORP. LTR: THE CNG CORP. SUSPENDED ALL HOT LINE INSULATION FITTING INSTALLATIONS UNTIL EVENTS SURROUNDING THE ACCIDENT COULD BE EVALUATED. CNG CORP. HAS IMPLEMENTED REVISED WRITTEN PROCEDURES TO REQUIRE A COMPLETE REVIEW OF EXISTING RECORDS PRIOR TO COMMENCING WORK. IT ALSO REQUIRES A TEST TAP TO DETERMINE THAT A PIPE IS A GAS CARRIER AND NOT A SLEEVE BEFORE ACTUAL HOT TAP IS PERFORMED. 2/1/78 - CNG LTR TRANSMITTING MATERIAL REQUESTED BY NTSB IN LETTER OF 1/24/77: CNG GUIDELINES FOR INSTALLATION OF HOT TAP INSULATOR FITTINGS, AND PROCEDURE TO INSTALL HOT TAP INSULATOR FITTINGS.

Addressee Acronym: CNG

Addressee Organization Type: S-State Government

Communication Date: 1978-01-24

Communication Type: Official Correspondence
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