scope:

PURPOSE

This John C. Stennis Space Center (SSC) standard (SSTD) specifies the materials and procedures for the construction of low pressure aluminum piping systems with Piping Designator "E" at SSC.

APPLICABILITY

a. This SSTD shall be used for specifying materials and components to be incorporated into the low pressure aluminum piping systems with Piping Designator "E".

b. Existing piping systems, piping system sections, and pipe spools that are modified, repaired, tested, or in operational service prior to the issue date of this SSTD are exempt from requirements of this SSTD. However, these existing piping systems, piping system sections, and pipe spools shall conform to this SSTD at specific locations where modifications and repairs are made and where new pipe and pipe fittings are installed into or joined to lines and components of these existing systems after the issue date of this standard.

c. Existing Aluminum Alloy 3003 pipe and fitting material that is to be cut, ground, machined, welded, or modified in any way shall be removed and replaced with Aluminum Alloy 6061. For these cases where weld joints are cut, the heat-affected zone of each existing weld joining Aluminum Alloy 3003 to Aluminum Alloy 6061 shall be completely removed from the Aluminum Alloy 6061 base metal before rewelding.