AS 4037 question

Hi all, I'm a newbie to this forum so please forgive me if I posted this in the wrong section.

Currently I'm preparing for a Cert. 10 exam and my wish is that somebody could clarify an answer for me.

Question:" List the non-destructive requirements for butt welds on a class 3 piping system, group A material , 15mm wall thickness , is to be pressure tested using the pneumatic method from AS 4037?"

AS 4037-1999 note 19, states that " Piping to be pneumatic test shall have all welds that penetrate the pipe wall subject to 100% RT or UT at a test level appropriate  to the class and material of construction and all attachment welds subject to 100% MT or PT examination. ( see also Section 13)." Section 13 , clause 13.3 states, "all butt welds shall be subject to the NDE- requirements for Class 1 construction listed in Table 7.3,"

So this is my understanding, assuming an ERW pipe was used and because of the joint factor then this would be 100% RT tested, but here is my confusion, note 19 table 7.3 says "  all welds that penetrate the pipe wall subject to 100% RT or UT at a test level appropriate  to the class ," but table 7.3  Class 1 piping, Weld type B, says 10% RT/UT+MT,  clause 13.3 sends you to table 7.3.

So which is it, 100% RT or 10% RT?

Many thanks in advance.

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