Is it really the intention of D1.1 to use a 1-1/2" diameter die post for plate PQR's less than 3/8" thick? Am I missing a commentary on this? Figure 4.11 (4.12 & 4.13) makes no provisions for testing on 50ksi and under material that is less than 3/8" thick. Most codes would have you use a 4t diameter die post. I typically just use a 4t diameter die post so that the testing also meets ASME Section IX. I would apply the same logic to 90ksi and over material; use a 6.66t diameter die post.
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