Our advice
SIL assessment of safety instrumented functions (SIF) – Calculations
Practical sheet REF: FIC0546 V1
Our advice
SIL assessment of safety instrumented functions (SIF) – Calculations

Author : Olivier IDDIR

Publication date: April 10, 2014, Review date: November 13, 2014 | Lire en français

Logo Techniques de l'Ingenieur You do not have access to this resource.
Request your free trial access! Free trial

Already subscribed?

4. Our advice

4.1 Keep a margin of uncertainty when calculating the probability of failure to assess the SIL level.

For example, if by calculation the probability of failure (PFD avg ) of a RIS is estimated at 9E-3, it will be prudent to consider the RIS to be SIL 1, even if the minimum SIL 1 level is equal to 1E-2. This approach helps to avoid uncertainties in the input data required for calculations (failure rate, percentage of common cause failures, etc.).

SCROLL TO TOP
You do not have access to this resource.
Logo Techniques de l'Ingenieur

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource. Click here to request your free trial access!

Already subscribed?

Article included in this offer

"Environment manager"

( 296 articles )

Complete knowledge base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

View offer details
Contact our team FAQ