Hey guys, I question came up were I work today that I would like to try and get some better information on.
Here is the issue, a spec for a project we are working on requires Ultrasonic Testing of all pipe welds being performed in accordance with B31.9 Building Services Piping. The systems are basic chilled water, condenser water, hot water, etc... All pipe is ERW carbon steel.
My questions are as follows;
1) I had always thought that an Ultrasonic Test was the best method of performing NDE on a welded joint. It shows the defects to the operator the best. However, since there is no film produced, it is up to the operator to determine the pass or fail. Here in NYC everyone likes to have an Xray done because it gets you a film that can be reviewed by anyone.
Can you guys provide me with any other reasons to perform a UT test vs an RT test and what are advantages and dis-advantages of both?
2) Granted that B31.9 Building Services piping is very lienient as far as NDT requirements are concerned (it actually doesnt require it at all but has a suggested minimum quality level,) However since all welds are to be UT tested to B31.9 standards, I still feel there is a considerable difference between a weld that will not be tested and the minimum quality level of B31.9.
What do you guys think of this? This is a major project with as many as 10,000 welds being performed for the entire building, so this could become a cost issue for us.
Please provide any insight on quality levels for welding to B31.9.
If you need further information or clarification please let me know and thanks in advance for any help.