Transportation Acceleration Loading
Transportation Acceleration Loading
(OP)
All,
PIP Industry Practice VESV1002, Design Criteria for Vessels, Section 4.2.8, Table 1 shows g loading for shipping modes (attached).
Is it the total final load to be used for shipping saddle design ? or additional vertical dead weight shall be added ?
I have seen vendor adding one more g to the vertical acceleration to account for dead weight. Though doing that is fine, but not sure if it is necessary. Anyone has insight of that table ?
PIP Industry Practice VESV1002, Design Criteria for Vessels, Section 4.2.8, Table 1 shows g loading for shipping modes (attached).
Is it the total final load to be used for shipping saddle design ? or additional vertical dead weight shall be added ?
I have seen vendor adding one more g to the vertical acceleration to account for dead weight. Though doing that is fine, but not sure if it is necessary. Anyone has insight of that table ?





RE: Transportation Acceleration Loading
Attached is the transportation load table from the Pressure Vessel Design Manual by Dennis Moss (3rd Ed).
Take a look at Table 7-3, and look at the loads per saddle in the y-direction. Within the brackets you have the term (Ws+Fy), where Fy is defined above Table 7-2 as K*Ws. So in effect, the total load they recommend considering is Ws(1+K), where K is the factor that depends on mode of transportation. So, you have to add dead load to the transportation acceleration.
The vertical factor for both road and rail are comparable in PIP to the values included in the Pressure Vessel Design Manual, so I suspect you should be using the same approach.
RE: Transportation Acceleration Loading
RE: Transportation Acceleration Loading
RE: Transportation Acceleration Loading
RE: Transportation Acceleration Loading
You have 2.0g in the ship, so you'll use 3.0g in the downward acceleration? So what you mean to say the the ship can accelerate downward 29.42 m/s2? That is too much from any of my past experiences.
RE: Transportation Acceleration Loading
On a recent project we were asked to comply with the factors from the following link:
https://www.fmcsa.dot.gov/regulations/cargo-secure...
The equipment in question was shipped from Oklahoma to Michigan via truck.
RE: Transportation Acceleration Loading
RE: Transportation Acceleration Loading
RE: Transportation Acceleration Loading
The two different sets of criteria, ASME and FMCSA shown above are two completely different animals. The ASME criteria are intended to indicate transport loads which might be induced on pressure vessels and the like during transit, and we should design our vessels for these possible loads. The FMCSA criteria are intended to insure that any given load does not shift on or fall off of a hauler/trailer in transit. And, the assumption is that the hauler/trailer better be strong and stable enough to handle these loads. Two completely different considerations, although they are about the same range of magnitudes.