Pipe Flow Calculations Forum

How do I calculate what the suction force in kilo pascals would be on a piece of pipe in order to determine which wall thicness would be able to sustain the suction pressure. Now, if I drill this suction piece full of small holes, how would this affect the strenght of the suction piece. How would I be sure that the suction force will not cause the pipe to implode?
Thanx Pieter