Module 10 - Selecting SIF components

Question 1

What key pieces of information can be found on a manufacturers certificate?

Answer 1

1. HFT
2. SC
3. Referenced standards

Question 2

What are some advantages and disadvantages of using a certificate?

Answer 2

Advantages

1. Certificates are simple to use
2. Certificates provide independent assurance of the manufacturers quality systems

Disadvantages

1. Certificates can be overly optimistic due to theoretical calculations
2. Knowledge of the certifying authority is required

Question 3

What evidence must be provided to be accepted on the basis of prior use?

Answer 3

1. Manufacturers quality systems
2. Devices must be identified adequately
3. Operating environments must be similar
4. Volume of operational experience

Question 4

What are the two methods of achieving systematic capability?

Answer 4

1. Select devices that comply with IEC 61508 evidenced through certification
2. Select devices using prior use argument

Question 5

What is best practice in achieving systematic capability?

Answer 5

Using a combination of certification and prior use

1. Certification provides assurance of manufacturing QA
2. Certification provides distribution of failure modes
3. Prior use provides real-world performance data