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API SPEC 5LD Document Information:
Title
Specification for CRA Clad or Lined Steel Pipe
American Petroleum Institute
Publication Date:
Jul 1, 1998
Scope:
COVERAGE
This specification covers seamless, centrifugal cast, and welded clad
steel line pipe and lined
steel pipe with improved corrosion resistant properties. The clad and
lined steel line pipe
specified herein shall be composed of a base metal outside and a
corrosion-resistant alloy (CRA)
layer inside the pipe. The base material shall conform to API Spec 5L
except as modified herein.
The primary product has square ends, but other special end preparation
may be furnished by
agreement between the purchaser and manufacturer. Included are NPS: 1
in. through 42 in.
Grades of base metal covered by this specification are X42, X46, X52,
X56, X60, X65, X70 and X80
and grades intermediate to these. Grades of the CRA layer are LC 1812,
2205, 2506, 2242, and 2262
and other grades which are subject to agreement between the purchaser
and the manufacturer.
GENERAL
a. This specification is under the jurisdiction of the Committee on
Standardization of Tubular
Goods.
b. The purpose of this specification is to provide standards for pipe
with improved corrosion
resistance suitable for use in conveying gas, water, and oil in both
the oil and natural gas
industries.
c. Although the plain-end line pipe meeting this specification is
primarily intended for field
makeup by circumferential welding, the manufacturer will not assume
responsibility for field
welding.
d. The size designations are nominal pipe sizes. In the text
paragraphs herein, where pipe size
limits (or size ranges) are given, these are outside-diameter sizes
except where stated to be
nominal. These outside-diameter size limits and ranges apply also to
the corresponding nominal
sizes.
METRIC UNITS
Metric units in this specification are shown in parentheses in the
text and in many tables. Outside
diameters and wall thicknesses are converted from inch dimensions. The
converted diameters are
rounded to the nearest 0.1 mm for diameters less than 18 in., and to
the nearest 1.0 mm for
diameters 18 in. and larger. Wall thicknesses are rounded to the
nearest 0.1 mm.
Metric plain-end weights are calculated from the metric outside
diameters and wall thicknesses
using the formula in 9.1 and rounded to the nearest 0.01 kg/m.
Metric hydrostatic pressures are calculated from metric outside
diameters and wall thicknesses and
metric fiber stresses shown in Sec. 8.
The factors used where conversions are appropriate are as follows:
The following formula was used to convert degrees Fahrenheit (°F)
to degrees Celsius (°C):
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