Do you mean "Dummy support" as opposed to damisupport? Sometimes a stancion is welded to the outside radius of a 90 degree fitting (of a pipe line) where one part of the pipe runs horizontal and the other pipe runs vertical. There would be a plate welded to the stancion with holes bored in it to mount it to the floor. This is used to support the weight of the riser and (IF the code allows it) is the most sensible way to hang the pipe. A weep hole from 1/8" to 1/4" is bored in to the stancion pipe support( usually about 2 or 3 inches from the plate) where one end is welded to the plate and the other end is welded to the 90 degree elbow. Why is there a weep hole? I am not an engineer (just a dumb welder) but I think it is to prevent trapped air from blowing out the welds on the stancion (it has happend to me along time ago). I am not sure, but I think it has something to do with condensation (from the pipe) having someplace to go thru the weep hole but I dunno.

Thanks about your respond.Also I want to know is that cause to implosion if the weep hole didn,t perform.

it is for condensation.