I was just going through one of the posts (how to give a reply) where he mentioned about a previous thread.
When i checked the posters thread, surprisingly it was closed : homework
The question he asked was basic, but if one goes through it, it can not be a homework.
in the o-let branch connection, What is the size (with tolerance) of the opening in run pipe?
deose the "full penetration groove weld" mean "complete fusion of the run pipe opening at the root pass"?
(Pardon the spelling mistakes and no, I am not the OP of the thread, of course i am of this
)
These seem to be a very fundamental doubts of some newbie in piping. And of course the second one is a straight lift from drawing.
Some guest has of course asked as reply "Is it a homework?"
But that does not preempt the admins. 
I feel the admin should judge, and not act on every reports.
Also if possible there should be an appeal button on the closed threads so that if some one like me feels that it has been wrongly closed then the admins can have a re-look?
BTW: this is not one off case, I have seen this earlier too few times, and once got it corrected.
What you say guys?