Not what im getting at....
Hoop stress acting on a bend stresses the ID, crown and OD etc... hence minimum wall thickness requirements and the differences in the calculations.
If after bending it needs to be n thickness on the ID, crown and OD to adequately handle the hoop stress (governing...
@LittleInch
ok but isnt hoop stress same in bend and an elbow ie we design to the stress and the the fabrications methods are independent of each other?
right i get that.... 14" NPS = 14" OD...
where NPS 4" = 4.5 OD
So what do i use to work out the radius....
Long radius = 1.5 * pipe diameter...
again which diameter to use?
Or there are values stated:
lets take 2"..
If you do: 1.5 * NPS = 3
if you do 1.5 * OD = 3.5625
For B31.3...
In calculating the radius, R1:
Long radius = 1.5 * Pipe Diameter
Is the diameter the outside diameter OR the values taken from ASME B16.9 which are the inside diameter.... or the stated nominal pipe size.
Which diameter is used?
Ok so the corrosion and reduction in bolt diameter are not 100% even - so lets say we have full D, 1.5 at the tops and bottoms within the nuts.
So in the middle, exposed area its reduced to 1.35 - so stress over an area at the 1.5 and 1.3 sections are different. So a static bolt stress, 63ksi...
Ok so lets say we have the following:
B7 Bolt UNC 8, 105ksi yield
Bolt Diameter = 1.5 (D)
Lets say target bolt stress = 60% of yield, 63ksi.
K = .16
Using ASME PCC-1 bolt root area - that gives Target Torque , T =(K D F / 12) ft-lbs = 1772.788205 ft-lbs
So in theory - we apply the bolt...
I managed to track down original stress analysis report.
This has evolved since I now found the construction drawings. It has a stay plate. So using the calculation for the Stay plate. I can replicate the outputs for the short plates. However the long plates I can not - this is because my c...
