1) The restriction is basically for a downhill position and this was not there in earlier EN288-3. In normal case when neither impact nor hardness is required I would apply para 4
2) I think in simple way this should have been given as 25 and above, at present it could be interpreted as 0.5D or 25 whichever is minimum, only restriction is there is no upper limit when a test piece dia >25mm.
(More hormonisation needed by CEN to compete http://ec.europa.eu/enterprise/newapproach/standardization/harmstds/refl)
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pieper-qsi@kpnmail.nl
Sent: Friday, February 13, 2009 4:37 AM
To: Materials & Welding
Subject: [MW:1573] RE: 1571] Some clarifications for BS EN 15614-1 : 2004
Dear Shrinivas,
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
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of shrinivas sohani
Sent: Thursday, February 12, 2009 10:40 PM
To: materials-welding@googlegroups.com
Subject: [MW:1571] Some clarifications for BS EN 15614-1 : 2004
Dear all,
I appreciate your feedback/views on following;
1) 1st Para of 8.4.2 reads -- "Welding of a test in any one position ( pipe or plate) qualifies for welding in all positions(pipe or plate) except for PG and J-L045 where a separate welding procedure test shall be required." ******** 4th Para reads -- "When neither impact nor hardness requirements are specified, welding in any one position (pipe or plate) qualifies for welding in all positions (pipe or plate)"
As per above description what one should do when Hardness and Impact requirements are not specified ( i.e. what is applicable Para 1 Or Para 4?)
2) Table 7 row#2, when Dia. of test piece is greater than 25mm -- Range of Qualification is Greater than or equal to 0.5x Diameter ( 25 mm min).
I understand from above is that the qualification range is greater than or equal to 0.5x Diameter and where this value is less than 25 mm ( Say 0.5x Dia = 20 mm or 15 mm ) it should be taken as min. 25 mm.
If somebody wants to interpreate this as min. 25 mm i.e. the range starts from 25mm as lower limit -- Is this right? I think its wrong.
Please have your views on above points.
Thanks.
Shrinivas
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---
No comments:
Post a Comment