5 replies to this topic

[mm217]

Dear All,

I want you, to describe the definition of "Turn Down ratio" in your plant. In my previous project, the turn down ratio of plant was 40%, so we should design the equipment and piping, etc. in order to work properly when the flow decreased to 40% of design rated flowrate. In our new Project i face to new definition! the turn down ratio is 70% but it means that flowrate decrease to 30% of rated flowrate and plant work properly!!! what does this phrase mean in your projects!

[fallah]

Dear All,

I want you, to describe the definition of "Turn Down ratio" in your plant. In my previous project, the turn down ratio of plant was 40%, so we should design the equipment and piping, etc. in order to work properly when the flow decreased to 40% of design rated flowrate. In our new Project i face to new definition! the turn down ratio is 70% but it means that flowrate decrease to 30% of rated flowrate and plant work properly!!! what does this phrase mean in your projects!

mm217,

Following link may help you out:

http://www.cheresour...h__1#entry53265

Fallah

[mm217]

Dear All,

I want you, to describe the definition of "Turn Down ratio" in your plant. In my previous project, the turn down ratio of plant was 40%, so we should design the equipment and piping, etc. in order to work properly when the flow decreased to 40% of design rated flowrate. In our new Project i face to new definition! the turn down ratio is 70% but it means that flowrate decrease to 30% of rated flowrate and plant work properly!!! what does this phrase mean in your projects!

mm217,

Following link may help you out:

http://www.cheresour...h__1#entry53265

Fallah

Fallah;

Thanks a lot.

[kkala]

In our new Project i face to new definition! the turn down ratio is 70% but it means that flowrate decrease to 30% of rated flowrate and plant work properly!!! what does this phrase mean in your projects!

Probably the meaning is decrease by 30% concerning rated flowrate. If so the plant will operate properly at 70% of rated flowrate. This complies with the former definition of mentioned 40%, judged to be right.

[mm217]

In our new Project i face to new definition! the turn down ratio is 70% but it means that flowrate decrease to 30% of rated flowrate and plant work properly!!! what does this phrase mean in your projects!

Probably the meaning is decrease by 30% concerning rated flowrate. If so the plant will operate properly at 70% of rated flowrate. This complies with the former definition of mentioned 40%, judged to be right.

Let me say:
e.g:
Rated Q= 1000 m3/hr
turndown ratio: 40%

Does it mean: Q at turndown: 400 m3/hr ?

or it means Q at turndown: 600 m3/hr?

Thanks

[fallah]

Let me say:
e.g:
Rated Q= 1000 m3/hr
turndown ratio: 40%

Does it mean: Q at turndown: 400 m3/hr ?

or it means Q at turndown: 600 m3/hr?

Thanks

mm217,

Q at turndown: 400 m3/hr,

Actually the turndown ratio in your case should be shown by 10:4, but its indication has been traditionally done by percent of minimum allowable flow respect to rated flow.

Fallah

Edited by fallah, 16 January 2012 - 03:51 AM.