| Applies To | |
| Product(s): | AutoPIPE Vessel |
| Version(s): | ALL |
| Area: | Calculations |
| Date Logged & Current Version | Oct 2018 40.07.00.007 |
Problem:
How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?
Solution:
This can be done by specifying an external load equal to the bundle pullout load.
See example below:
Case 1: Without considering bundle pullout load
The friction factor = 0.3 is mentioned for a right anchored saddle.
In the calculation report, the longitudinal saddle load for right saddle is computed as follows:
Horizontal Longitudinal Load = friction factor x (total vertical load on saddle 2)
= - 0.3 x (reaction due to weight of equipment for the loading case on saddle 2 + weight of saddle 2)
= - 0.3 x (817.3 + 159.8) = - 293.1 daN, negative sign as the reaction is acting to the left
So the bolt shear load is calculated as below:
Max. shear = RaHL/Sb/nb = 293.1/324.3/4 = 0.226 daN/mm2 = 2.26 N/mm2 = 2.26 MPa.
Case 2: Considering bundle pullout load
In the same model above, now an equivalent bundle pullout load = 1000 daN is applied axially towards
right at the left tangent line:
This extra load is now seen in the design report:
Horizontal Longitudinal Reaction = -(293.1+1000) = -1293.1 daN
In the bolt calculation this is taken into account:
Max. shear = RaHL/Sb/nb = 1293.1/324.3/4 = 0.997 daN/mm2 = 9.97 N/mm2 = 9.97 MPa.