sequence. For example, P-1 or pump suction valve (PSV)-1, and P-2 or pump discharge valve
(PDV)-2. An alternative that would identify valves to a specific pump is P-1-1 or PSV-1-1 and P-1-2
or PDV-1-2 for pump 1 suction and discharge valves.
Pipelines - Pipelines, both incoming from and outgoing to the manifold, are identified by a letter. The
incoming lines of a pipeline begin where they enter the facility and end where they connect to the
manifold. For example, a line entering the facility is identified with a letter (starting with A). Valves
located in the line are identified with the line letter followed by a dash (-), and then in numerical
sequence starting with 1. The highest number identifies the valve in the line just prior to its
connection to the manifold. If line A has five valves in it, then they would be numbered starting with
A-1 (the valve nearest the entry to the facility) and ending with A-5 (the valve closest to the
manifold). The outgoing lines begin at the furthest point inside the manifold and are identified with
the line letter, a dash, and a number. The last valve in an outgoing line is the one at the point where
the line ends in, or exits, the facility.
Additional markings used in a system for identification include the following:
Direction of Flow - The direction of flow in a line is indicated with an arrow physically placed/painted on the
line. The direction can be in one direction only or in both directions.
Product Identification for Products - The product identification for products should relate to the product in
the line (that is, tank lines immediately outside the manifold should show the product).
Product Identification for Facilities - The product identification for a facility will be applied where practical
depending on the tactical situation and the commander's guidance.