This specification covers the design and material requirements as well as the construction strainer boxes used in ships' bilges and other tank locations requiring trash protection for suction pipes and pumps. Materials covered by this specification are Types 1 and 2 strainer boxes, which shall be manufactured free of defects, burrs, and sharp edges, and with dimensions conforming to the requirements specified. The strainer boxes shall be hot galvanized after fabrication.

1.1 This specification covers the design, materials, and construction of strainer boxes for use in ships’ bilges and other such tank locations that require trash protection for suction pipes and pumps.

1.2 This specification covers pipe sizes from NPS 1¹/₂ through NPS 16 (see Note 1).

Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this specification for such traditional terms as “nominal diameter,” “size,” and “nominal size.”

1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.