160 Pressure Vessel Design Manual - Step 1: PERIOD OF VIBRATION 0 or I part W ha Y ' 1.0 - 1.0 - - n- n- c- be Notes 2 and 3. I = (from Procedure 3-3) :, = lesser of .07 lV or .25 V :t I 0 if T s .7 sec See example of completed form on next page.