SPECIFICATION RT-1157 ISSUE 2 Page 3
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4.2.2 Acceptance Test Samples
Acceptance test samples shall consist of not less than 16 feet (5 m) of tubing selected at random from each
lot. A lot shall consist of all tubing of the same size, from the same production run, and offered for
inspection at the same time.
4.3 TEST PROCEDURES
Unless otherwise specified, tests shall be performed on specimens which have been fully recovered by
conditioning for 5 minutes in a 150 ± 2°C (302 ± 4°F) oven. Prior to all testing, the test specimens (and
measurement gauges, when applicable) shall be conditioned for 3 hours at
23 ± 3°C (73 ± 5°F) and 50 ± 5 percent relative humidity. All ovens shall be of the mechanical convection
type in which air passes over the specimens at a velocity of 100 to 200 feet (30 to 60 m) per minute.
4.3.1 Dimensions and Longitudinal Change
Three 6-inch (150-mm) specimens of tubing, as supplied, shall be measured for length ± 1/32 inch (± 1 mm)
and inside diameter in accordance with ASTM D 2671, conditioned for 10 minutes in a 200 ± 2°C (392 ±
4°F) oven, cooled to 23 ± 3°C (73 ± 5°F) and then remeasured. Prior to and after conditioning, the
dimensions of the tubing shall be in accordance with Table 1 and the longitudinal change shall be in
accordance with Table 2. Longitudinal change shall be calculated as follows:
C = L1 - L0
L0 x 100
Where: C = Longitudinal Change (percent)
L0 = Length Before Conditioning [inches (mm)]
L1 = Length After Conditioning [inches (mm)]
4.3.2 Tensile Strength and Ultimate Elongation
Tubing shall be tested for tensile strength and ultimate elongation in accordance with
ASTM D 2671. For tubing size No. 12/6 and smaller, the specimens shall be full sections of tubing. For size
No. 18/9 and larger, the specimens shall be cut with Die D of ASTM D 412. The specimens shall have 1-
inch (25-mm) bench marks, centrally located. The testing machine shall have an initial jaw separation of 1
inch (25 mm) for full sections of tubing and 2 inches (50 mm) for die cut specimens. The rate of jaw
separation shall be 5 ± .5 inches (125 ± 12.5 mm) per minute.
4.3.3 Low Temperature Flexibility
Three specimens, each 12 inches (300 mm) in length, shall be conditioned, with the appropriate mandrels at -
25 ± 3°C (-13 ± 5°F) for 4 hours. For tubing sizes No. 5/2.5 or smaller, the specimens shall be whole
sections of recovered tubing. For tubing sizes 8/4 and larger, the specimens shall be 1/4-inch (6.3-mm) wide
strips cut from tubing which has been recovered in accordance with 4.3. The mandrel diameter shall be 40
times, ± 10% the specimen thickness. For tubular specimens, the specimen thickness shall be taken as the
outside diameter. While at the specified temperature, and still in the cold chamber, the specimens shall be
wrapped around the mandrel not less than 360 degrees in 10 ± 2 seconds. The specimens then shall be
visually examined for evidence of cracking.