BS 5M 23 87th Edition, November 30, 1987
Specification for an Identification Scheme for Pipelines
Includes all amendments and changes through Reaffirmation Notice , November 1, 2010
Additional Comments: SAME AS ISO 12 * INCLUDES AMENDMENT 1
Published By:British Standards Institution (BSI)
Includes a modified scope and field of application. A symbol for filtered air has been added, and details of the supplementary marker have been expanded.