RT1、RT2、RT3、Rt4的区别

dwy000

这个是设计规定的，说得很隐晦难懂，经常把搞糊涂了，大家不妨谈谈自己的高见。

lw6688

RT1 是FULL RT, 100%RT   when all pressure-retaining butt welds, other than Category B and C butt welds associated with nozzles and communicating chambers that neither exceed NPS 10 (DN 250) nor 11/8 in. (29 mm) wall thickness [except as required by UHT-57(a)], satisfy the full radiography re-quirements of UW-11(a) for their full length; full radiography of the above exempted Category B and C butt welds, if performed, may be recorded on the Manufacturer’s Data Report; or “RT 2” 是B类 没做100% RT  when the complete vessel satisfies the requirements of UW-11(a)(5) and when the spot radiography requirements of UW-11(a)(5)(-b) have been applied; or
RT3 是 PART RT,  “RT 3” when the complete vessel satisfies the spot radiography requirements of UW-11(b); or

RT4 是   when only part of the complete vessel has satisfied the radiographic requirements of UW-11(a) or where none of the markings “RT 1,” “RT 2,” or “RT 3” are applicable.


  
在我印象中RT4非常少见

z8212020

lw6688 发表于 2015-10-20 20:08
RT1 是FULL RT, 100%RT   when all pressure-retaining butt welds, other than Category B and C butt wel ...

RT4经常碰到，RT2比较少见

技术小白

RT1-100%检测
RT3-抽检
RT4-不检测
以上三种可以同国标一起理解，基本是一样的
RT2-国标没有这么规定，因为国内A、B类焊缝是一起考虑的，而ASME对于A、B类焊缝是分开考虑的，当纵缝E取1.0,而环缝E取0.85时，就是RT2了，纵缝100%检测，而环缝抽检，但是还得加上UW-11(a)(5)(-b)中的抽检才行。国外觉得纵缝的应力是环缝的2倍，我纵缝100%检测如果都么得问题，环缝就不比100%检测，可以节约经济嘛。前不久AI来的时候讲的，我但是觉得明白了。这就是我的理解。

wwwwz

1342011009

magame123

好像到目前也没有哪位先生提供啊！
- 本文出自ASME中国制造，原文地址：http://www.asimi8.com/thread-4551-1-1.html

tangju

感谢各位的分析，很有帮助。

Henry88842110

RT1是100%RT，RT3是SPOT RT. RT2是在RT1的基础上增拍按照UW11-A(5)b.是由于出现了T头。筒体在成型时做100%RT，在成型后开孔时接管，正好位于A\B缝时需要对该重合的AB焊缝做SPOT RT。我们俗称增拍。其实ASME标准修改时放宽了，我记得老标准开孔离得很近还没落上去就要增拍。开孔影响区扫过的AB缝就要做。1998版的GB150的容器开孔影响区完全照抄ASME。以开孔直径的1.5倍为半径化圆。

yangyangshu

请见ASME BPVC VIII-1,  UG-116 REQUIRED MARKING （e）.

这里面已经规定得非常清晰了。

(e) When radiographic or ultrasonic examination has been performed on a vessel in accordance with UW-11, marking shall be applied under the Certification Mark as follows:
按UW-11 规定进行射线检测或超声波检测的容器应在认证标志下面，按下面规定进行标志：

(1) “RT 1” when all pressure-retaining butt welds, other than Category B and C butt welds associated with nozzles and communicating chambers that neither exceed NPS 10 (DN 250) nor 11/8 in. (29 mm) wall thickness [except as required by UHT-57(a)], satisfy the full radiography re-quirements of UW-11(a) for their full length; full radiography of the above exempted Category B and C butt welds, if performed, may be recorded on the Manufacturer’s Data Report; or
除连接不超过NPS 10 (DN 250)及壁厚不超过1-1/8 in. (29mm)的接管和连通室的B 和C 类对接焊缝之外［UHT - 57 (a)要求的除外］，所有承压对接焊缝全长满足UW -11(a)的全部射线检测要求，则标志“ RT l ”；如果上述免除的B 和C 类对接焊缝进行了全部射线透照检测，也可记录在制造商数据报告上；或

(2) “RT 2” when the complete vessel satisfies the requirements of UW-11(a)(5) and when the spot radiography requirements of UW-11(a)(5)(-b) have been applied; or
完工容器满足UW -11 (a)(5)的要求。及按UW-11(a)(5)的要求进行抽样射线验，则标志“RT 2”；或

(3) “RT 3” when the complete vessel satisfies the spot radiography requirements of UW-11(b); or
完工容器满足UW-11(b)抽样射线检验的要求，则标志“RT 3”；或

(4) “RT 4” when only part of the complete vessel has satisfied the radiographic requirements of UW-11(a) or where none of the markings “RT 1,” “RT 2,” or “RT 3” are applicable.
只有完工容器的部分满足UW-11(a) 射线照相检验要求，或标注““RT 1,” 、“RT 2,”或““RT 3”都不合适，则标志“RT 4”。

The extent of radiography and the applicable joint efficiencies shall be noted on the Manufacturer’s Data Report. 射线检测比例及相应的接头系数应在制造商数据报告上予以注明。






同样的问题，楼主可以参见本论坛的下面这个帖子，其中也有偶的回复：
请高手指点RT1,RT2,RT3,RT4怎么理解?
http://www.asimi8.com/forum.php? ... 79&fromuid=5389
(出处: ASME中国制造)