rt1 vs rt2

[david339933]

Can anyone explain RT1 vs RT2. Everywhere I look, I seem to get a different answer. It seems the more I dig, the more confused I get.

Thanks in advance.

 

[SnTMan]

What context?

 

[Kiwi2671]

David,
It is Radiographic Testing personnel qualifications,
Level 1, Level 2 or Level 3
Regards.
Kiwi

 

[Eddycurrentguy]

RT 1, 2, 3 and 4 refer to a marking on the name plate that describes the amount of radiography performed on the vessel, which is used as the joint efficiency factor. See ASME VIII, Div. 1, UG-116

 

[Kiwi2671]

David,
As SnTman has stated - context of enquiry is required.
Eddycurrentguy has given a different context to the one listed by me but it is a correct response.
Not sure about ASNT but British / European / Australian and New Zealand NDT documents / reports abbreviate Radiographic Testing Level 2 to RT 2 as an example (refer ISO 9712 Section 6)
Regards,
Kiwi

 

[david339933]

I am trying to interpret the requirements to satisfy RT2.

 

[david339933]

Section VIII states that UW-11(a)5 needs to be fulfilled. I am having a hard time interpreting this.

 

[SnTMan]

Oh, Sec VIII, Div 1!

david339933, UW-11(a)5 has been discussed numerous times in the B&PV forum and perhaps in the ASME Code forum as well. Tried a search?

Regards,

Mike

 

[weldtek]

david,
UG 116(e)(2) spells out the requirements for RT-2 pretty clearly. Have you reviewed this? If so and you're still unclear it would help if you could be more specific with your question.

 

[david339933]

I have read UG 116 and UW 11(a)5, but still am unsure as to requirements. Would rt on all long seams, t-joints (joining of long and circ seams), plus an extra spot on circ, fill these requirements?

 

[Duwe6]

Short answer: Yes. Assuminging you mean the entirity of each long seam.

 

[david339933]

Yes in entirety. Thank you all.

 

[weldtek]

david,
That also might be more RT than required. Long seams 100% and spot on the round seams per UW 52. ( RT of Tees isn't mandatory)
You're choice of words causes me to think you may be overlapping requirements for applying UW11(a)(5)(b) on a vessel receiving spot RT. ( RT 4) however, even in that case RT on Tees isn't mandatory.

 

[FLHTCUI]

UG-116(e) states it shall be used "When the complete vessel meets the requirements of UW-11(a)(5) and UW-11(a)(5)(b)." With UW-11(a)(5)(b) stating the spots it requires cannot be used for any other increment of weld and UW-52 states spots taken to satisfy UW-11(a)(5)(b) shall not be used to satisfy the requirements for spot radiography and per interpretation VIII-1-04-14 the girth seams would have only a 70% JE(assuming they Type 1 or 2). If your design is sufficient with a JE of 70% and you have taken a spot on each intersecting B or C weld RT 2 is the appropriate stamping. If additional spots are taken to satisfy UW-52 to obtain a JE of 85% then RT 4 would be the appropriate stamping. The one issue I can't get resolved is whether or not each B or C weld requires a spot or just each 50' increment of intersecting B & C welds require a spot.

 

[weldtek]

Basically RT-1 is 'Full' radiography UW11(a), and RT-2 is also 'Full' radiography. The difference is that by following the rules in UW11(a)(5)(b), RT-2 allows one to shoot spot on the round seams, (cat B & C) and still achieve a JE of 1.

 

[EngAddict]

clear as mud hey..