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This specification covers carbon steel overboard discharge hull penetrations for system piping. Penetrations shall be classified as follows: Type I; Type II (Class 1 and Class 2); Type III (Class 1 and Class 2); and Type IV (Classes 1, 2, and 3). Doubler and insert plates shall be of material with physical properties equal to or better than the reinforced shell plate. Overboard discharges shall be combined to the maximum extent practicable to minimize the number of shell penetrations. Overboard discharges shall be located to minimize recirculation into suction seachests. Shell penetrations shall be located outside of cathodic protection areas. Penetration pipe extension past the shell plate shall be equal to the pipe wall thickness.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers carbon steel overboard discharge hull penetrations for system piping of NPS 1 through NPS 24 (see Note 1).
Note 1—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such TRADITIONAL terms as nominal diameter, size, and nominal size.
1.2 The minimum pipe schedule and reinforcement dimensions presented in Tables 1-6 are based on specifications in 46 CFR, 56.50-95 and Navy Design Data Sheet 100-1.
1.3 This specification does not include sea chest penetrations.
1.4 This specification does not include penetrations in protective plating.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A519 Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
ANSI StandardB36.10 Welded and Seamless Wrought Steel Pipe Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Military DocumentMIL-STD-1689 Fabrication, Welding, and Inspection of Ships Structure Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://dodssp.daps.dla.mil.
Other DocumentsABS Rules for Building and Classing Steel Vessels
ICS Number Code 47.020.30 (Piping systems)
UNSPSC Code 40170000(Pipe piping and pipe fittings)
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ASTM F994-86(2011), Standard Specification for Design and Installation of Overboard Discharge Hull Penetration Connections, ASTM International, West Conshohocken, PA, 2011, www.astm.orgBack to Top