SA 182 Gr. F9 & Impact testing Per B31.3 Figure 323.2.2A

[timsch]

I have a design using SA 182 Gr. F9 material for a sampling thermowell/quill that will consist of an SA 182 Gr. F9 flange and F9 bar. The bar will have a 1/4" diameter bore and the components will be full-pen welded. The customer has reviewed our weld procedure which has no record of impact testing and has submitted comments stating that the base metal thickness is limited by curve B of Figure 323.2.2A. I have been unable to see that this material is covered by curve B. Table 1A lists a minimum temperature rather than a letter code for a curve for SA 182 Gr. F9.

Am I missing something?

 

[metengr]

If you are providing a part, like a thermowell, I would qualify a groove weld WPS with impacts using Gr 9 material against the base material you are joining. The concern is the effect of welding on the original impact qualified base material, new weld and Grade 9 base material.

 

[timsch]

metengr,

I agree and understand the importance and reasoning behind impact testing at service temperatures lower than minimum allowable per code. I'm trying to make sure that I can look at the code text, figures, etc. and understand what is being instructed by them. In this case, we have the customer and myself looking at the same code and coming up with different interpretations. I don't want to be the one who in misinterpreting. When I look at 323.2.2A and then go to Table 1A, I'm not seeing that SA 182 Gr. F9 is designated as being a curve B material. If the customer had simple said that I must impact test for temperatures lower than that shown in Table 1A, I would have no issue.

 

[DVWE]

I agree that impact testing is not required as long as your design minimum temperature is not below -20F in accordance with 323.2.2 and Table 323.2.2. This material is not a Curve B material.

 

[david339933]

Agree with DVWE. - Note 6 Table A-1

 

[timsch]

Thanks for the input.

 

[weldstan]

One must ask, why would you choose an MDMT for this alloy which would require impact testing? This material is used for high temp service generally > 650 F.

 

[timsch]

weldstan, that is a very good question. I work for a company that manufactures per customer requirements. We do not choose the materials for their orders. We submitted our existing weld procedure for this material to the customer for their review, and they came back with a rejection of the existing weld procedure and corrections that must be made for them to accept it. I had no problem with creating an addendum with most of these changes, but I made an exception to the requirement that we add a material thickness limitation based on 323.2.2A without impact testing. After going back and forth with them a couple of times asking for reasoning/clarification and them sticking with their original position, I posted this thread to get outside opinions. Most likely, we will have to add this limitation to the weld procedure for this customer only just to keep the order, but at least I will be able to do so knowing that I was not mistaken in the 1st place.

As is usual, this community helped with valuable input. Thanks again to everyone.

Tim