GGG-T-2761
(Non-Government standards are normally available from the organizations that
prepare or distribute the documents. These documents also may be available in
or through libraries or other informational services.)
2.3 Order of Precedence. In the event of a conflict between the text of
this document and the references toted herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been-obtained.
3.
REQUIREMENTS
3.1 Design and const ruction . Tongs shall be of the lever, double jaw, open
caliper type with compound leverage grip. The jaws or liners shall grip the
outside of the pipe at a point below the centerline of the pipe. The tongs
shall be constructed to provide a nonmanual positive release from the pipe after
the pipe is set down, and the hoisting line is slacked off. Tongs shall be of a
configuration suitable for operation in a close side clearance for handling pipe
in a narrow trench. The design and construction of the tongs shall provide
adequate strength and grip of cast or fabricated parts to meet the performance
requirements represented by the test in 4.5. Class I tongs shall be of
heat-treated aluminum alloy as specified in 3.4.1; and shackles, links, and
rings shall. be aluminum-alloy forgings as specified in 3.4.2; or shackles shall
be of cast-aluminum alloy as specified in 3.4.1. class II tongs shall be
fabricated of steel plate as specified in 3.4.3, or cast steel as specified in
3.4.4; shackles, links, and rings shall be steel forgings as specified in 3.4.5;
or shackles shall be steel castings as specified in 3.4.4. Fulcrum pins shall
be brass as specified in 3.4.6.
st ar ticle. When specified in the contract or purchase order, a
3.2
sample shall be subjected to first article inspection (see 4.2.1, 6.2, and 6.6).
3.3 Standard commercial D roduct. The tongs shall, as a minimum, be in
accordance with the requirements of this document and shall be the
manufacturer's standard commercial product. Additional or better features which
are not specifically prohibited by this specification but which are a part of
the manufacturer's standard commercial product, shall be included in the tongs
being furnished. A standard commercial product is a product which has been sold
or is being currently offered for sale on the commercial market through
advertisements or manufacturer's catalogs, or brochures, and represents the
latest production model.
3.4 Materials. Materials shall be as specified herein and in applicable
specifications and standards, and other referenced documents. Materials not
specified shall be selected by the contractor and shall be subject to all
provisions of this specification. Materials shall be free of defects which
adversely affect performance or serviceability of the finished product.
3.4.1 Cast aluminum. Cast aluminum parts shall be aluminum-alloy castings,
heat-treated, conforming to ASTM B 179. The alloy designation shall be that
used by the manufacturer in regular commercial production of the parts.
3.4.2 Aluminum forgings. Aluminum forging parts shall be aluminum-alloy
forgings conforming to ASTM B 247. The alloy designation shall be that used by
the manufacturer in regular commercial production of the parts.
3
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