ansi 9standards0 code issues - use of tangent edge lines

huangyhg

ansi use of tangent edge lines
looking for feedback regarding the use of "tangent edge"  lines in draft views.  we are re-evaluating their role in our best practices/drafting standards.  typically we've used them for isometric views, and then on a discretionary basis in orthographic views.  presently their use is under question, with the possibility of an "all or nothing" policy being proposed.  hence the inquiry.  i was unable to find anything definitive in ansi  (1994) or global engineerings 10th edition drawing requirements manual after a cursory review.  any specific standards documentation, as well as  company practices on the subject is greatly appreciated.
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i don't re  
a drawings purpose is to convey data and information.  using tangent lines can either clear or cloud an issue, just as hidden lines can.
ray reynolds
"computers in the future may weigh no more than 1.5 tons."
popular mechanics, forecasting the relentless march of science, 1949