This specification covers hot-dipped zinc-coated (galvanized) welded steel pipe in NPS 1, NPS 1 ¼, NPS 1 ½, NPS 2, NPS 2 ½, NPS 3, NPS3 ½, NPS 4, NPS 5, NPS 6, NPS 7, and NPS 8, with the specified nominal wall thickness, intended for fence structures such as structural support. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. The steel for welded pipe shall be be of soft weldable quality and shall be made by one or more of the following processes: electric-furnace, open hearth, or basic oxygen. Welded pipe NPS 4 and under may be butt-welded. Welded pipe over NPS 4 shall be electric welded. Pipe shall be coated with zinc inside and outside by hot-dip process. The steel pipe shall meet the tensile requirements for tensile strength and yield strength specified for regular, intermediate strength, and high strength grades. The weight of zinc coating shall be determined by strip test. The dimensional (diameter and thickness) and weight requirements for the steel pipe are specified and the test requirements for welded pipes are detailed. Lengths of toprail may be of random lengths, unless otherwise specified.

1.1 This specification covers hot-dipped galvanized welded steel pipe in sizes ranging from 1.315–8.625 in. (33.4 – 219.1 mm) outside diameter (OD) inclusive, with nominal (average) wall thickness as given in Table 1 and Table 2. Pipe having other dimensions (Note 2) may be furnished provided such pipe complies with all other requirements of this specification. Pipe ordered under this specification is intended for use as a structural support for fencing in accordance with Specification F1043, Group 1A.

Note 1—Outside diameter size is designated in that fence fittings are designed to securely fit on the outside of the pipe framework.

Note 2—A comprehensive listing of standardized pipe dimensions is contained in ANSI B 36.10.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

TABLE 1 Dimensions, Nominal Weights (Plain Ends) for Standard Weight Pipe (Schedule 40)

Note 1—Pipe furnished in accordance with this table will be standard pipe. Nominal size designations are names, not dimensions, thus they are a unit-less term. The dimensionless designator NPS (nominal pipe size) is referenced in this specification as it is the historical designation for schedule 40 pipe. The fence framework application requires the framework fittings to fit securely on the outside of the pipe and therefore the OD, outside diameter, is the applicable dimension for this specification.

Note 2—The wall thickness is expressed in three decimal places, the fourth decimal place being carried forward or dropped, in accordance with Practice E29.