How to build RBD if the process has bypass?

[AromaticsThailand]

I'm try to evaluate DEMO BlockSim7 that I've plan to use in my company. My plant is Oil & Gas that all you know the plant design with high reliability. So, I would like to know how to build block in some portion of process. For example: if control valve fail and remove to repair but the system can running by bypass line.

Please guide me to solve the my problem

Thank you.

[Pantelis]

BlockSim uses RBD’s (reliability block diagrams) and/or Fault Trees and/or a mixture of the two, to create system models. You need to have an understanding of these methodologies – especially if you are going to model something complex. I can answer your control valve question by telling you to put the items in parallel (redundancy), however I think it would be much more productive if you took some time and reviewed the concepts for yourself. http://www.Weibull.com (http://www.weibull.com/) has a complete text book on this subject that you can start with. It is available on-line for free at http://www.weibull.com/systemrelwebcontents.htm (http://www.weibull.com/systemrelwebcontents.htm).

Hope this helps.

[AromaticsThailand]

I think also that to put the block witch parallel control valve but I'm not know what are properties in this block??? :confused::confused:....

P.S. I read point by point that I need to know when I build the block. That me more help. Thanks you.

[AromaticsThailand]

Again! If I put in parallel, would you suggest me to put Standby Container instead Block, right?

[Pantelis]

If the component is in a standby mode, then yes.

[AromaticsThailand]

Question again to clear my understand. If it have2 Pumps (Path require = 1) but switching every 3 months, how does to build it?

[Pantelis]

Standby would work.. or alternatively if you are restoring it during that time (as you mentioned earlier) you may choose to PM it with a three month duration on each one of them... Again there are many options on how to do that, depending on what you are trying to model.
Depending on your time and schedule may I suggest you look into some of the courses offered (http://www.reliasoft.com/seminars/gencourses/index.htm specifically RS 522 Details (http://www.reliasoft.com/seminars/gencourses/rs522.htm)).
They are offered in your region from www.ReliaSoft.asia (http://www.reliasoft.asia/)

[AromaticsThailand]

I've one question to build RBD for these component:

ABCD is component are series but have special connection

A connect to B, B to C, C to A and D


We can build like these.

[Pantelis]

Ok.. an RBD connection represents the reliability relationship between components not their physical relationship. So with that in mind I am not sure what you are trying to do ...

[AromaticsThailand]

As per connection above, I represent the one of Column that have two connection to each other equipment.

I've two scenario as per below;

#1 The feed into Column then out at top and bottom

#2 The feed into Column then out at top to Reflux equipment. It product out from Reflux equipment bottom then into the same Column again.

How to build RBD from two scenario?

Thank you

[Pantelis]

As per prior posting an RBD is a reliability diagram NOT a physical diagram thus what feeds into what is irrelevant from an RBD point of view. What is relevant is how you define system success. If all pipes must operate so that the system is successful then they are in series (even though physically they are in parallel) and so forth.

So what you need to do is think of your situation in terms of system success combinations.