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Air Preheater Economics
Do you plan to switch the heater to natural draft mode when you bypass the APH? If not, you better check the design temperature of your ID fan. Frequently the ID fan design temperature assumes cooling from the APH and may not be able to handle the hot flue gas.- buelowj
- Post #8
- Forum: Chemical process engineering
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PSV Discharge Line Choking
I used adiabatic compressible fluid assumption rather than isothermal assumption because I figured that for the short time it would take to travel through the tail pipe there would be very little time for heat transfer between the outside air surrounding the pipe and the relieving fluid. I...- buelowj
- Post #8
- Forum: Safety Relief Valve engineering (PSV)
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PSV Discharge Line Choking
I appreciate the advice DJKruger and thanks for the software link! Also, I agree with you about using the pipe for the calculation in the second choke. I think my original post was confusing. I did include the effects of the 100 ft of pipe for the second choke. I used the compressible...- buelowj
- Post #3
- Forum: Safety Relief Valve engineering (PSV)
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PSV Discharge Line Choking
While validating the fire relief case for a propane drier, I came across a discharge pipe sizing issue that I'd like some advice on. The drier has a balanced bellows style PSV with a set point of 445 psig. Using the API 521 guideline for vessel relief when exposed to external fire, I calculated...- buelowj
- Thread
- Replies: 8
- Forum: Safety Relief Valve engineering (PSV)
