A questions about "wipe" in CWM Recovery
I wonder What is the difference between a wipe and format In terms of safe deletion of data?
  


A wipe is, in any method, removes selected data from filesystem. It can be plain deletion or formatting the partition.

A format is a complete reset of a disk partition, by cleaning everything up and re-build its headers, inode records, file allocation tables, etc.


  
  How can I Completely Wipe Data from all partitions of phone device? (I want do that before install a new ROM).
  


Use the 1st option wipe data/factory reset. That's enough.


  
  What is the overwriting Standard used in the wipe? ,thanx in advance.
  


AFAIK there's no overwriting. It simply deletes files and/or formats partitions of your phone.