Impact Tests of Materials (UG-84 - ASME VIII Div. 1)

[YMech]

Hello,

I need to produce a PQR that requires impact testing, per ASME VIII Div. 1. Is it required that the material I use for the procedure qualification be impact tested? Material used in production would be impact tested, but I am wondering if my PQR material also requires it (of course, the weld/HAZ will need tested).

I'm currently looking at UG-84(d).

Thanks!

 

[Don56]

Are you a gambling man? To qualify your PQR you will need to impact test the weld metal as well as the heat affected zones. If the base metal wont pass CVN testing the HAZ wont either.

 

[r6155]

If you are sure of the certificates of impact test by material manufacturer then a new impact test is not necessary.

Regards
r6155

 

[YMech]

@Don56, a woman, actually.

I realize it is a risk on the HAZ not passing impact. My question is; is it required that the material used in the PQR must be impact tested, even if that isn't the material (i.e, same heat) used in production.

 

[david339933]

You don't state materials used, but remember that for Carbon Steels (built to UCS), the PQR material needs to be in the same heat treat condition as the production material. So if you are using SA-516-70 with impacts it will be normalized (per Spec)....you would need normalized material for the PQR. See UG-84(h)

 

[YMech]

@david339933 thank you. I was jumping around the code to much to pick up on UG-84(h)(2)(-c), which requires test plate to must meet the minimum notch toughness relative to material used in production.
Thank you!

 

[r6155]

1) for PQR : not required

2) Required as below:
(I) Vessel (Production) Impact Test Plates
(1 ) General. In addition to the requirements of (h)
above, impact tests of welds and heat-affected zones shall
be made in accordance with (g) above for each qualified
welding procedure used on each vessel or group of vessels
as defined in (3) below. The vessel impact test plate
shall be from one of the heats of steel used for the vessel
or group of vessels.

Regards
r6155

 

[YMech]

Thanks, all.

I should have elaborated the background to my question first.

Fabricating a vessel of SA 516-70N material, 2.5" thick. Procedure for Cat. A & B joints done with the same material/heat using SAW process. Impact testing was done on the material by the manufacturer and we performed impact testing on the weld/HAZ as required.

However, due to the impact requirements on the repad material, which is also 2.5" thick - I now need a procedure that allows fillet weld base metal up to 2.5" (becomes essential with impact testing, so restricted to QW-451 of ASME IX). To make my matters a little more messy, the lift lugs/repad were made out of SA36 (different group number than SA516-70). I'm basically trying to reduce the number of impact testing/procedures that will still allow us to weld on 2.5" thick base, includes impact, and allows for Group 1 & 2. Ideally, weld SA36 to SA516-70 - but the material I have on hand for that is not impact tested, hence my question (if impact testing of the test material was not required, would reduce the need for (2) separate sets of base metal impacts).

 

[r6155]

Ohhh no.
1) SA-36 is no allowable in your design.
2) Fillet weld 2,5" are you sure?

Regards
r6155

 

The answers you seek are all found in UG-84.
It is extensive so I suggest you use multiple highlighter colours to block out the different topics such as weld procedure qualification, production test blocks, etc.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Don56]

Ymech, I stand corrected, Ma'am.

 

[CWEng]

Make sure you use dual certified SA-516 Gr. 70 and Gr. 60 for your PQR, and you would be qualified for both group 1 and 2. You definately want to pay attention, as mentioned, to the heat treat condition of your test plates and procution material. Is the SA-36 normalized? That's not so common. What temperature are you impact testing at? If I was doing the PQR, the impact testing temperature might determine whether I was a betting person or not based on the situation you describe. That, and which steel mill that made the SA-516 material, and the level of residual elements such as S and P, and what the grain size is if reported.

This is a great primer on the properties of SA-516 material:

http://www.usa.arcelormittal.com/~/...l-products/plate-products/Pressure-vessel.pdf

 

SA-36 should not get closer to a pressure vessel then the nameplate bracket IMO.
A well designed PQR uses dual certified SA-516 as mentioned previously. Grade 60 covers P-1, Gr.1 and Grade 70 is P-1, Gr.2.
I'm not a designer, but 2.5" thick repads sounds extreme - is that the most efficient way to design/construct this vessel? Maybe VIII-D2 could be useful here.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."