PE Problem #73

9/16/2019

For a performance-based design, a fire protection consultant makes an assumption that the production rate of carbon monoxide for a modeled fire package is equal to the highest production rate of each of the component fuels. This assumption would be considered:
a. explicit safety factor
b. implied safety factor
c. total safety factor
d. no safety factor

Solution | Posted 09/17/19

6 Comments

MDS

9/16/2019 08:36:02 am

B. Implied Safety Factor

SFPE 5th Pg. 3003, "Implied Versus Explicit Safety Factors"

9/16/2019 10:07:09 am

I would like to add here, for PBS, Explicit safety factors are multipliers applied to critical analysis parameters, often (and preferably) the final outcome criteria used to judge the acceptability of a design.

Also refer to FPH P3-183, second last para.
Any other understanding, most welcome

MDS

9/16/2019 11:06:44 am

As I read it, selecting the highest production rate of each of the component fuels is a conservative assumption or worst case scenario, which meets the definition of implied safety factor in the SFPE handbook.

If the problem said the designer took the production rate of the, most abundant component and added 50%, that would be an explicit safety factor.

The section on "Use of Safety Factors in Prescriptive
and Performance Codes" , also on SFPE Pg 3003 clarifies this:

"An example of an implied safety factor in a performance code is an assumption that the rate of production of carbon monoxide for a given fuel package is equal to the rate of production of the
component fuel with the highest production."

9/16/2019 10:03:06 am

a. FPH P3-184, Its Performance based design

9/16/2019 11:32:35 am

b. implied

Amr

9/16/2019 02:27:26 pm

B. Implied Safety Factor - SFPE 5th - P.3003

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PE Problem #73

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