You can view the page at [url=http://www.egpet.net/vb/content/864-saddle-pressure-vessel]http://www.egpet.net/vb/content/864-saddle-pressure-vessel[/url]
Printable View
You can view the page at [url=http://www.egpet.net/vb/content/864-saddle-pressure-vessel]http://www.egpet.net/vb/content/864-saddle-pressure-vessel[/url]
I can't find the source just now, because it is from a Pressure Vessels short course, but the professor suggestion was:
A = Distance from saddle center to Tangent Line = 0.4 R, where R is the vessel radius.
A < 0.2 L, where L is tangent to tangent distance.