Sorry cant help you there but the papaer at this location has a procedure for estimating loads on buried pipe subject to dropped loads. Hope this helps.
DRex,
For the report you are looking for, you may have contact Vetitas themselves. Other related references are DnV Guideline 14.5, "pipeline - trawler interaction" also check the OTC listing on the subject, there are several papers, offhand I do not have the references.
Narendranath R
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I tried a search without finding the document, but I found other documents which might be interesting and with references to this dnv/veritas/veritec report
Veritas Offshore Technology and Services A/S (VERITEC). "Design guidance for offshore steel struc-
tures exposed to accidental loads". Report No. 88-3172, August 1988.