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External chloride stress corrosion cracking of stainless steel lokring pipe connectors

Health and Safety Executive - Safety Alert
Department Name: Energy Division (Offshore)
Bulletin No: ED 01-2015
Issue Date: 14 April 2015
Target Audience: Offshore
Chemical Processing and production
Key Issues: This Safety Alert highlights the issue of chloride stress corrosion cracking of stainless steel Lokring pipe connectors and advises dutyholders on actions required.

Introduction:

This Safety Alert highlights the issue of chloride stress corrosion cracking which has been found to affect stainless steel (grade 316/316L) Lokring pipe connectors. The cracking has occurred in the driver / swage ring section of the connector as shown:

Background:

Action required:

Relevant legal documents:

The relevant legal requirements are:

  1. The Health and Safety at Work etc Act, 1974, Sections 2 and 3.
  2. Offshore Installations (Prevention of Fire & Explosion, and Emergency Response) Regulations 1995, Regulation 9
  3. Provision & Use of Work Equipment Regulations, 1998, Regulation 5.
  4. Control of Major Accident Hazard Regulations, 1999, Regulation 4.

References:

Further information:

Health & Safety Executive
HID Energy Division (Offshore)
Mechanical Engineering
Redgrave Court
Bootle L20 7HS

2015-04-14