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tosg (Mechanical)the following shall be considered:

K323.3.4 Test Temperatures. For all Charpy impact
tests, the test temperature criteria in (a) or (b) below
shall be observed.
(a) Charpy impact tests shall be conducted at a
temperature no higher than the lowest metal temperature
at which a piping component or weld will be subjected
to a stress greater than 41 MPa (6 ksi). In specifying
the required test temperature, the following shall be
considered:
(1) range of operating conditions;
(2) upset conditions;
( 3 ) ambient temperature extremes; and
4) required leak test temperature.

(b) Where the largest possible test specimen has a
width along the notch less than the lesser of 80% of
the material thickness or 8 mm (0.315 in.), the test
shall be conducted at a reduced temperature in accor-
dance with Table 323.3.4, considering the temperature
as reduced below the test temperature required by (a)
above.

Impact testing is still required except as provided when the maximum obtainable Charpy specimen size is very small.  See K323.2.2(b).  The impact test temperature will probably be -50F if the highest stress is less than 6 ksi.