Page 191 - Pressure Vessel Design Manual

Design of Vessel Supports 169

Transverse Load: Basis for Equations

Method 1

w2= -
6FB
E*
Therefore the total load, QF, due to force F is

WU 3FB 3FB
E
QF = w~E E2 E = -
=
e Unit load at edge of base plate, tqd. Method 2

w,, = w1 +we

e Derivation of equation for w2.

Q

Therefore
1 E 1
1
M -
6FB
Z E2
This method is based on the rationale that the load i
e Equivalent total load Qz. no longer spread over the entire saddle but is shifted to on
side.

Combined force, Q2.
This assumes that the maximum load at the edge of the Q2 = JFT@
baseplate is uniform across the entire baseplate. This is e Angle, &.
very conservative, so the equation is modified as follows:
F
e Using a triangular loading and 2/3 rule to develop a f!?H = (arctan)-
more- realistic “unijom loud” Q
e Modijled saddle angle, 8,.
FB 3FB
FI=---
(2/3)E - 2E