4 replies to this topic

[Faisal Ghafoor]

In calculating boil-off vapor to determine the size of refrigeration compressor/ PSV capacity on ammonia storage tank (double wall full containment), I want some guidance on calculation of vapor due to ambient pressure changes. API-2000 gives calculation guidelines. Does the ambient pressure fall should be fixed; as it is mentioned 2000 KPa/hr in API or it should be dictated in design basis based on facility location and meteriology data? Does it vary significantly place to place. 

Should I do sudden pressure rise due to ambient effect (rain etc.) for calculating vapors; Attachment A of API-2000 suggests to consider 60% of rapid cooling rate? or, it is valid for single wall tank only.

 

 

[Bobby Strain]

You probably already have the answers to your questions. You have all the information at hand; we have none.

 

Bobby

[Faisal Ghafoor]

The questions I have put are still questions for me. 

[ccjayesh]

In calculating boil-off vapor to determine the size of refrigeration compressor/ PSV capacity on ammonia storage tank (double wall full containment), I want some guidance on calculation of vapor due to ambient pressure changes. API-2000 gives calculation guidelines. Does the ambient pressure fall should be fixed; as it is mentioned 2000 KPa/hr in API or it should be dictated in design basis based on facility location and meteriology data? Does it vary significantly place to place. 

Should I do sudden pressure rise due to ambient effect (rain etc.) for calculating vapors; Attachment A of API-2000 suggests to consider 60% of rapid cooling rate? or, it is valid for single wall tank only.

Could you please tell me storing temp and pressure?

[Faisal Ghafoor]

Pressure 0.05 barg and temp -33.5C