Impact Test Exemption for Scrapper - Design Press, 68barg at 85degree Celisus

Need technical clarification whether impact test exemption can be applied for vessel design pressure=69barg@55deg Celcius.

But as per client specs "All materials used in the manufacture of scraper trap barrels shall be subject to approved of OWNER. All pressure containing components NPS 2 and larger shall have proven notch toughness meeting the requirements of ASME Section VIII, paragraph UG-84, in the final heat treated condition. Charpy V-notch impact tests shall be performed at or below 10C."

We have spending hours for vendor/supplier to supply these Flanges & Fittings, but only one flanges have impact test result in their mill cert at 20^oC.

It difficult to source material that available ex-stock which ready with impact tested for A 105 FLANGE AND A 234 WPB FITTING. Unless order is made for indent material where mill can specially manufacture but in longer delivery period.

One way to have the impact tested is by scarifying the pair of material with similar heat no and send to lab for impact testing. Unfortunately, some of the flanges do not have pair especially 10" Weldolet.

Impact test for 2" Weldolet is not possible for impact testing as advised by Testing lab company.

Based on UG-20(f) of ASME VIII Div.1 for material A-105, A-106B and A-234WPB listed in the drawing is suit to MDMT down to -29°C without impact testing. Our Scraper Receiver MDMT is only 15°C. Based on this condition , is it possible for exemption from impact testing.

In addition, As per B31.3 A106B is exempt from impact testing at -20F for thicknesses up to 1/2". This comes from Table A1 showing A106B as a Curve B material and referencing Table 323.2.2A for temperature / thickness exemptions.

Alternatively, if the material is not approved (as it deviate from the spec, but acceptable under ASME VIII) we are sourcing for low temp flanges/fittings as it is normally impact tested.