I don't know what's the reason but i couldn't reply on your message so
therefore I put my answer in a separate message.
1) You can find the demand for hardness in table 1 of the BS-ISO
15614-1, see footnotes remark "e" . Only when qualifying materials
from group 1.1 / 8 / and 41 up to 48 there are no hardness
requirements for all other group you have to perform such. Regarding
the Charpy-V impact test the following: if the base material
specification / certificate mention impact values for the base metal
you also need to test such for the PQR.
Both paragraphs of 8.4.2 applies when there are no requirements for
hardness and impact tests. This means that your procedure is qualified
for all positions accept the mentioned PG (5GD) and J-L045 (6GD) which
always requires separate PQR. I must say that the way they put it in
the BS-ISO 15614-1 is a little bit indistinct, in my opinion it was
enough to mention only the first paragraph, this avoids any
discussions.
2) If you need to qualify PQR for diameters < 25 mm you really have to
weld a test pipe with a diameter also < 25 mm, as mentioned in the
first row of table 7 chapter 8.3.2.3.
When the pipe used for the test weld has a diameter of greater than 25
mm, for example 30 mm, the qualification has a validity range of > Ø
25 mm in stead of Ø > 15 mm.
The interpretation is correct when somebody says that the lower limit
is Ø 25 mm.
Best Regards,
Herman Pieper
Pieper Quality Support and Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
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