ForumRe: B31.1 Power Piping: Y Factor in Pressure thickness formula 3A
From: Murphy [21]
Date: Thursday, July 29, 2010
Time: 12:33:22 PM
Remote Name: 170.215.203.2
Comments
The little d is inside diameter. The custom or practice for piping is to consider little to be ID of pipe. Also, the little d is the pipe or header size up to 12-inches then at 14-inches the big D is the pipe size.Thickness calculation is a primary stresses and a secondary stress is a bending issues at the branch connection. These are both a priority and one is not more important than the other.
The y coefficient is a carryover from the BPV Code and is dependent on the material group and temperature. Basically, y is a dimensionless factor that thins the code minimum wall when the y value increases which is at higher temperatures.
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