Hello everybody
Is there any published standard to determine the criticality rating and criticality index for rotary equipments?
Any standard nomber?
Ihave one(norsok 008) but I want to know if there are other published standards.
THANKS in advance.

Not that I'm aware. Is there a way to calculate criticality? I thought it's yes or no to LOss of HSE. production & Economic? Can I view your Norsok 008? Does it tell how to calculate or you have to come out with your own matrix of risk?

Ali
i'm not aware of any standard that gives you the criticality and i believe you wont find anything reliable. The reason is because the criticality depends on the function and service that the equipment is performing within a system. Thus it cannot be calculated as a standard because it is variable depending on the company policies and function and service.
But on the other side there are many standard to guide you to calculate the criticality and they are basically based on 3 factors; economical criticality (loss of profit opportunities and maintenance cost and operating cost), safety criticality and environmental criticality.
All these 3 factors are correlated to likelyhood of the failure through a matrix relation.
As well you understand that all these factors are depending upon a huge amount of variables.
hope to have been of some help.

ORIGINALLY POSTED BY LUCA
But on the other side there are many standard to guide you to calculate the criticality and they are basically based on 3 factors; economical criticality (loss of profit opportunities and maintenance cost and operating cost), safety criticality and environmental criticality.

THANKS Luca
If possible I am interested to have some of these economical based standard nombers(international standards are prefered).

Ali-Af,

My first references on this issue were the American norm MIL-STD-882D – Appendix A and, later, the MIL-STD-1629. Take a look at what Quality America Inc. says about it:

http://www.qualityamerica.com/knowledgecente/articles/cre7.1.html

I use "criticality" as being the product: "probability" x "severity" x "delectability" and as Luca said, the classification depends on the specific functions of the equipment being studied and the consequences of a failure to the organization. Therefore, I would recommend that you use common sense and don't get too much limited by norms. I my self have assessed criticality quite a few times and criteria for the above classification used to be long discussed and finally agreed among people involved in every new case.

Regards,

Rui

This message has been edited. Last edited by: <Rui Assis>,

there is an interesting standard that you can download from any search engine: MIL-STD-1629A.
It is a little bit dated but basically nothing changed too much.