bird57
Chemical
- Jun 19, 2008
- 2
Hello Everyone,
I am process engineer and working with oil and gas consultant company.For my experience is not much.it's around 1 year for this job.This is my first time for posting.if there are some mistake,please forgive me.
Now I'm sizing vent stack for natural gas metering and regulating station.I so confuse about criteria for sizing.I want to know about Much No. at tip of vent stack used in stack.My boss told me that using 0.99 Much No. for sizing.for this case is choke flow.pressure at tip of vent stack is more than atmosphere and gas velocity equal sonic velocity.if used this case,gas diffusion will be very good.This I misunderstand or not? but I see some work don't used right this.They use Much no less than that.Assumed it's 0.80 . If calculating with value, it's not choke flow so pressure at tip of stack will be atmosphere pressure. This point make me very confuse.this can used or not. In my opinion if there is not pressure difference between tip of stack and surrounding which cause gas velocity.why gas velocity can be 0.80 much No. This make me don't understand for a long time.what point i misunderstand.Please suggest me.
Thanks in advance for every recommends
Best regard,Sakkrit
I am process engineer and working with oil and gas consultant company.For my experience is not much.it's around 1 year for this job.This is my first time for posting.if there are some mistake,please forgive me.
Now I'm sizing vent stack for natural gas metering and regulating station.I so confuse about criteria for sizing.I want to know about Much No. at tip of vent stack used in stack.My boss told me that using 0.99 Much No. for sizing.for this case is choke flow.pressure at tip of vent stack is more than atmosphere and gas velocity equal sonic velocity.if used this case,gas diffusion will be very good.This I misunderstand or not? but I see some work don't used right this.They use Much no less than that.Assumed it's 0.80 . If calculating with value, it's not choke flow so pressure at tip of stack will be atmosphere pressure. This point make me very confuse.this can used or not. In my opinion if there is not pressure difference between tip of stack and surrounding which cause gas velocity.why gas velocity can be 0.80 much No. This make me don't understand for a long time.what point i misunderstand.Please suggest me.
Thanks in advance for every recommends
Best regard,Sakkrit