I am installing a 100 lb farm sink. The specs suggest supporting it for 300 lbs. I have a span of 30 inches in a cabinet. I would like to use either several lengths of 12 gauge strut channel or .5 or .75 galvanized pipe. I will have both the ends of either of these sunk into 1 inch thick wood. The load will be over the entire length of the steel and not be moving. They will act as a shelf for the sink. I keep thinking the the strength of the pipe would be greater for a smaller size considering that an arc is quite good at supporting a load. Can any one suggest what would be the best choice and how many lengths that they think i should use. Oh, the sink is 29.75 x 17.875 and 10 inches tall.