ASME BTH-1-2008, Impact Multiplier Determination

[RebelBrill]

ASME BTH-1-2008, Section 2-2.1 Design Category A, Commentary states that Category A lifting devices must have an impact multiplier not greater than 50%. It doesn't define "impact multiplier" or provide a means to calculate it. Any guidance on these issues uould be appreciated.

 

[RebelBrill]

Since I've received no responses to my question, I thought that some clarification of my request might be helpful.
I'm not asking for guidance on how to calculate impact forces, duration, etc. These have been the subject of several requests in this forum. I'm asking if ASME has set maximum allowable value for the "impact multiplier" of 50% what is the specific methodology they use to calculate this value so that I can use the SAME METHODOLOGY to calculate the impact multiplier for my applications.

Does anyone know if ASME has a preferred methodology, or if any "suitable" approach chosen by a "qualified" individual can be used.

 

[boo1]

When you review the Design Category (static strength
criteria) guidance and service class (fatigue life criteria) of Ch 2-2 and 2-3, see where your design fits. The Commentary 2-2.1, "maximum impact multiplier of 50%" is indicated to help determine if you design fits in the Design Category A. Most lifters are designed to Cat B.

Review 1-4.1 and 1-5.1 for qualification requirement. I believe in the U.S. many states require PE lic.