floor drain vents

[kmann2535]

I'm not sure if multiple floor drains in auto repair garage should be trapped vented if they flow to an oil interceptor which is trapped and vented.
i have about 16 trench drains spaced about 50 ft apart in a slab on grade installation.
they receive no other drainage
The code says floor drains within 15 ft of vented fixture do not require vents. i thought this might be for a situation in a bathroom with a floor drain

 

[phishfood]

These trench drains do not have a Ptrap on each drain, correct? If they do not, then they don't need a vent.

 

[rferreira]

I have a floor sink, and then a floor drain and then another floor sink on the same 4" WASTE LINE. Do I just vent after the first floor sink and that will take care of all??

 

[Matt30]

3 and 4 inch emergency floor drains do not require venting