my gosh Ken, you appear to be almost as stubborn as i am... i like that! i wrote:
section modulus is moment divided by stress. moment is half the force(lb) times half the distance(in). the force is the weight of the water-filled pipe plus 250. the distance is 4ab/a+b. the stress is 15,000. for example: 4" S40 15 feet, center of 48" span: 16.4 x 15 = 246 + 250 = 496 x .5 = 248 4 x 24 x 24 = 2304 / 48 = 48 x .5 = 24 248 x 24 = 5952 / 15,000 = .3968 Brad _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
