Rev Date: March 2015
Page 1 of 8
This document is uncontrolled when printed.
POSITIVE ISOLATION
ALL‐HSE‐PRC‐181
Retention Code:
CG01 ‐ CA
Revised: March 2015
Owner:
HSE Performance Assurance
Approved By:
Manager, HSE Performance Assurance
Effective:
June 2015
Review Frequency:
Five years or less
Table of Contents
Page
1.0 Purpose .......................................................................................................................................................... 2
2.0 Hazards to Mitigate ........................................................................................................................................ 2
3.0 Procedure‐Specific Roles and Responsibilities ................................................................................................. 2
3.1. Supervisors ................................................................................................................................................... 2
3.2. Worksite Supervisors/Worker in Charge ...................................................................................................... 2
3.3. Workers ........................................................................................................................................................ 3
3.4. Engineering ................................................................................................................................................... 3
4.0 Procedure ....................................................................................................................................................... 3
4.1. Additional Equipment Required ................................................................................................................... 3
4.1.1. Additional Personal Protective Equipment (PPE) ............................................................................ 3
4.1.2. Additional Equipment ...................................................................................................................... 3
4.2. Blanking and Blinding ................................................................................................................................... 4
4.3. Double Block and Bleed ................................................................................................................................ 4
4.4. Alternative Isolation Methods ...................................................................................................................... 5
4.4.1. Single Valve Isolation ....................................................................................................................... 5
5.0 Document Retention ...................................................................................................................................... 6
Appendix A – Definitions ......................................................................................................................................... 7
Appendix B – Revision Record ................................................................................................................................. 8
