HelloPlease see the pdf drawing, how can I make a 45 deg hatch so it will look like the one in the red circle? And not the one showed in the full pipe.http://dl.dropbox.com/u/559096/123.pdf

You will need an add-on utility to make this type of hatch.

 
Please try the attached LISP tool by M.Jacinto (load it with APPLOAD and start the CYLHATCH command):
uploads/20100604_113445_cylhatch.lsp

Nice routine, tried it at your direction.
 
Thanks for posting it Vladimir!