New Standpipe install, info

Hi all, found this site and found it very helpfull, though I do need a little more information, I found Terry's picture of a rough standpipe install, which I am going to use in my 40 yr old home, Question is pertaining to his picture, I have a double utility sink, and behind the wall i also have a bathroom sink, so I am looking at his picture to add a vent and a standpipe, will having that extra batroom sink going into the drain affect anything. Also I want to take out the double utility sink and add a more modern single sink.
Secondly does each entry have its own p-trap/ 1 for each sink and one for the standpipe? If I look at Terry's photo the out for the sink should run to a new p-trap.


Thanks
montreal, canada or a true canuk