Plant Room Chilled Water WPQR??

[DripWeld101]

We`re doing a plant/pump room (chilled water) with 10" carbon down to 3/4" carbon. Will a generic ASME IX WPQR do for this?? and correct me if I`m wrong a 6" 6G test will cover me up to 10"?? and 3 No: 3/4" will be needed to qualify me for the 3/4". Will I also need a 2" test to be done to bridge between these 2? All these are 6G of course. The client is suggesting radiography as NDT throughout. As these procedures will cover me for socket welds (some of the smaller stuff are socket welds) and that a lot of the time the radiography on socket welds is to determine whether that the expansion gap was left between the end of pipe and socket rather than quality of weld, keeping this in mind wouldn`t Penetrant testing do as an NDT on these sockets (same welders will be welding the butt welds as the sockets) Any help is much appreciated.

 

[metengr]

The welder qualification for this job can be done with one WPS and should require a groove weld coupon with the following recommended size;

(1) 3/4" diameter to qualify to size (3/4") and to an unlimited maximum diameter (see QW-252.3).

(2) the 6G will cover all positions

(3)a groove weld qualification will qualify for fillet welds (QW-452.6).

Regarding NDT, the RT would be to confirm a proper gap after welding. Wet fluorescent MT would be my choice for surface NDT of the system welds.

 

[metengr]

see (QW-252.3).

Sorry the above should be QW-452.3, this was a typo.

 

[DripWeld101]

Thanks for the info Metengr. Have I not to test the welders on 3 3/4" to get the required amount of weld to be tested? We have used this method for quiet some time. Is it necessary at all?

 

[metengr]

DripWeld101;
What does 3 3/4" diameter do for you other than you have a welder qualified for 2 7/8" minimum to unlimted maximum. You need to review ASME Section IX, Article III. The table QW-452.3 above applies to welder performance qualification groove weld diameter limits.

 

[DripWeld101]

The 3 3/4" tests are not about diameter limits, it's about the amount of weld produced for inspection on a test piece. It has to be 80mm of weld at least to validate the test.

 

[metengr]

DripWeld101;

Do you understand WPS and welder performance qualification requirements for Section IX? Review ASME Section IX, and if you don't have a copy BUY IT.

 

[StoneCold]

metengr I believe tht Dripweld101 is saying three 3/4" pipe welds to produce enough coupons to satisfy all the testing. I think that is only if you are qualifying the procedure, not just the welder.

Regards
Brad Stone

 

[metengr]

Maybe, but I can't read minds. Also, what is the 80mm reference thickness, length ??? More information is needed and clarity.

 

[DripWeld101]

Metengr, there is no need to read minds,it`s pretty simple. I`ve said it in as plain language as i can, but here goes again : "The 3 3/4" tests are not about diameter limits, it's about the amount of weld produced for inspection on a test piece." If you are not aware of such requirements all you have to say is that you don`t know. In order to satisfy the procedure at least 80 mm of weld is needed to qualify as a test piece. Now where you are getting confused on whether it lenght or width is beyond me as it`s 3/4" pipe we`re talking about. How you would get confused on this is pretty amazing. Anyway, the original question was will I have to qualify a new WPQR and test the welders to this or can I just choose a generic ASME IX for Class CS1?

 

[DripWeld101]

@Stonecold: Thanks for the input.