Current through August, 2024
I. Listed Pipe
Specifications. Numbers in parentheses indicate applicable editions.
API 5L--Steel pipe (1988).
ASTM A53--Steel pipe (1979).
ASTM A106--Steel pipe (1979).
ASTM A333--Steel pipe (1979).
ASTM A381--Steel pipe (1979).
ASTM Specification A671--Steel pipe (1977).
ASTM Specification A672--Steel pipe (1979).
ASTM Specification A691--Steel pipe (1979).
ASTM D2513--Thermoplastic pipe and tubing (1987).
ASTM D2517--Thermosetting plastic pipe and tubing
(1973).
II. Steel pipe of
unknown or unlisted specification.
A. Bending
Properties. For pipe 2 inches or less in diameter, a length of pipe must be
cold bent through at least 90 degrees around a cylindrical mandrel that has a
diameter 12 times the diameter of the pipe, without developing cracks at any
portion and without opening the longitudinal weld.
For pipe more than 2 inches in diameter, the pipe must meet
the requirements of the flattening tests set forth in ASTM A53, except that the
number of tests must be at least equal to the minimum required in paragraph
ll-D of this appendix to determine yield strength.
B. Weldability. A girth weld must be made in
the pipe by a welder who is qualified under subchapter 7 of this part. The weld
must be made under the most severe conditions under which welding will be
allowed in the field and by means of the same procedure that will be used in
the field. On pipe more than 4 inches in diameter, at least one test weld must
be made for each 100 lengths of pipe. On pipe 4 inches or less in diameter, at
least one test weld must be made for each 400 lengths of pipe. The weld must be
tested in accordance with API Standard 1104. If the requirements of API
Standard 1104 cannot be met, weldability may be established by making chemical
tests for carbon and manganese, and proceeding in accordance with section IX of
the ASME Boiler and Pressure Vessel Code. The same number of chemical tests
must be made as are required for testing a girth weld.
C. Inspection. The pipe must be clean enough
to permit adequate inspection. It must be visually inspected to ensure that it
is reasonably round and straight and there are no defects which might impair
the strength or tightness of the pipe.
D. Tensile Properties. If the tensile
properties of the pipe are not known, the minimum yield strength may be taken
as 24,000 p.s.i. or less, or the tensile properties may be established by
performing tensile tests as set forth in API Specification 5L. All test
specimens shall be selected at random and the following number of tests must be
performed:
NUMBER OF TENSILE TESTS - ALL SIZES
| 10 lengths or less....... |
| 1 set of tests for each |
|
|
| length. |
| 11 to 100 lengths........ |
| 1 set of tests for each |
|
|
| 5 lengths, but not less |
|
|
| than 10 tests. |
| Over 100 lengths......... |
| 1 set of tests for each |
|
|
| 10 lengths, but not | less than 20 tests. |
If the yield-tensile ratio, based on the properties
determined by those tests, exceeds 0.85, the pipe may be used only as provided
in section 6-77-21(c).
III. Steel pipe manufactured before November
12, 1970, to earlier editions of listed specifications. Steel pipe manufactured
before November 12, 1970, in accordance with a specification of which a later
edition is listed in section I of this appendix, is qualified for use under
this part if the following requirements are met:
A. Inspection. The pipe must be clean enough
to permit adequate inspection. It must be visually inspected to ensure that it
is reasonably round and straight and that there are no defects which might
impair the strength or tightness of the pipe.
B. Similarity of specification requirements.
The edition of the listed specification under which the pipe was manufactured
must have substantially the same requirements with respect to the following
properties as a later edition of that specification listed in section I of this
appendix:
(1) Physical (mechanical)
properties of pipe, including yield and tensile strength, elongation, and yield
to tensile ratio, and testing requirements to verify those
properties.
(2) Chemical properties
of pipe and testing requirements to verify those properties.
C. Inspection or test of welded
pipe. On pipe with welded seams, one of the following requirements must be met:
(1) The edition of the listed specification
to which the pipe was manufactured must have substantially the same
requirements with respect to nondestructive inspection of welded seams and the
standards for acceptance or rejection and repair as a later edition of the
specification listed in section I of this appendix.
(2) The pipe must be tested in accordance
with subchapter
12 to at least 1.25 times the maximum
allowable operating pressure if it is to be installed in a class 1 location and
to at least 1.5 times the maximum allowable operating pressure if it is to be
installed in a class 2, 3, or 4 location. Notwithstanding any shorter time
period permitted under subchapter
12 the test pressure must be
maintained for at least 8 hours.
