UG-30(e) radial loads units
UG-30(e) radial loads units
(OP)
Hi,
in UG-30 Attachment of stiffening ring, (e) Strength of Attachment Welds,
(1) The radial pressure load from shell, lb/in., is equal to PLs.
(2) The radial shear load is equal to 0.01PLsDo.
Shall I assume the factor 0.01 is valid only for US Customary units?
Or that the mention lb/in. is out of date?
Or both?
Yours truly,
Tigny
in UG-30 Attachment of stiffening ring, (e) Strength of Attachment Welds,
(1) The radial pressure load from shell, lb/in., is equal to PLs.
(2) The radial shear load is equal to 0.01PLsDo.
Shall I assume the factor 0.01 is valid only for US Customary units?
Or that the mention lb/in. is out of date?
Or both?
Yours truly,
Tigny





RE: UG-30(e) radial loads units
I haven't really tried to derive the values, but suspect that the 0.01 term (which exists in the 2003 SI version) is not a unit conversion term but related to the 2% (odd - not 1%) mentioned in the paragraph.
jt
RE: UG-30(e) radial loads units
The factor 0.01 is also valid for metric or SI units.
If you look at Example L-5 in Appendix L, the following were given and calculated:
P = 15 psi
Ls = 40 in.
Do = 169 in.
Radial shear load = 0.01 (15)(40)(169) = 1014 lbs. = 4.52 kN
Converting P, Ls, & Do to SI units and calculating for the radial shear load...
P = 103.4 kPa
Ls = 1.02 m
Do = 4.29 m
Radial shear load = 0.01 (103.4)(1.02)(4.29) = 4.52 kN
The results are the same using the same factor 0.01.
RE: UG-30(e) radial loads units
thank you for your answers, I can step a little bit further!
Indeed in example L-5.3 , 0.01PLsDo is labelled as "lb" so 0.01 would have no units.
yours truly,
Tigny
RE: UG-30(e) radial loads units
sorry to bug you but I am wondering where the 0.25 coefficient in the L-5.3, allowable load for the welds come from:
It is written 2 x 0.67 x 0.25 x 7.865
2 is for weld on both sides
0.67 is for percentage of weld in intermittent weld
7.865 ksi is the allowable fillet weld stress (55% of S).
- Is coef 0.25 coming from UCS-68, "Lightly loaded attachement", therefore implying paramaters pertaining to this chapter are enforced to this particular calculation?
- May I then use a factor 1 for UHA, high alloy steel construction?
yours truly,tigny
RE: UG-30(e) radial loads units
RE: UG-30(e) radial loads units
I was looking all over the code for this value...
I was stuck with the metric value (6mm) but should have looked
Thanks again,
Tigny