huangyhg

ansi ansi 84 - sil ratings - m
when a client has a manual equipment operating procedure, or even if it is "...supervised-manual..." according to nfpa 85; what is the engineer's position on establinhing a sil rating for lopa?
if an operating procedure exists (e.g. for startup) and the lopa is for the startup case, it can be credited as a layer of protection. it's value is dependant on the quality of the procedure and the number of people involved to verify the steps are completed in the proper sequence. normally the risk reduction factor of up to 0.1 would be considered reasonable.

__________________
借用达朗贝尔的名言：前进吧，你会得到信心!
[url="http://www.dimcax.com"]几何尺寸与公差标准[/url]