Test Load

[hungrydinosaur]

Hi,

DNV 2.7-3 (Portable Offshore Units) guideline states that the test load should be MGW X 2.5 x g, where MGW is the Maximum Gross Mass of the equipment, and g would be 9.81 m/s^2. Suppose the MGW is 5000 kgs, then the test load comes out to be 122,625 N. This is equal to 12,504 Kg. If you only multiply MGW X 2.5, it comes out to be 12,500 kgs. I am wondering the acceleration value of 1g, will only induce a difference of 4 kgs? Any comments or insight into this please?

Thanks in advance.

HD

 

[BigInch]

Kilograms are mass. Newton is a force. Loads are forces N. There is no such thing as a mass load with units of kg.

I hate Windowz 8!!!!

 

[TomekZeWschodu]

@BigInch:

There is such thing as unit of Kilogram Foce (

http://en.wikipedia.org/wiki/Kilogram-force)

It is not commonly used but exists in physics.

@hungrydinosaur:

MGW [kg] = 5000
2.5 [-] = 2/5
g [m/s^2] = 9.81

Test Load = MGW*2.5*9.81 =122625 [N] =122.626 [kN]
units [Test Load] = [kg] * [-] * [m/s^2] = [N] (clear definition of Newton)

You can define load using mass but units have to be correct.

Naval Architect/ Structural Engineer
Poland