Recent content by JWengtips

David: Thank you very much for your constructive comments. I'll dig out more regarding the failure of the drum, and think over the possible solution. Regards, Joan

Thanks all. Our client has an existing flare stack with a KO drum. The KO drum is designed based on the back pressure of the stack, which is around 7 psig. However, when they operated the flare system, the KO drum was failed (a crack occurred on a nozzle). I've used Hysys to analyse this flare...

Does anybody know how to determine the design pressrue of KO drum in a natural gas flare system? Much thanks.

Yorkman: Thank you very much for your constructive comments/suggestions... I'm educated from them. I think I need to discuss more with our client regarding the existing system. Then decide which way we should go. You are a real engineer!!! Best regards, Joan

Thank you, Yorkman: The system max.operating temperature is 121C(250F). The heat medium is 50% Glycol and 50% Water. This is an existing system. My duty is to check the size of existing expansion tank to see if it's still adquated due to the capacity of the system increased (more unit heaters...

I have to explain a little bit more about our system. Our system is for industry buildings unit heating. The highest point for our system is around 10 meters. Our expansion tank is at suction of pumps and located about 3.3 meters high. We have compress air (pressure 100 psi) injects to the...

BronYyAur: I mean plus the head different between highest point and the expansion tank because the tank is lower than the highest point of system. Thanks!!

BronYyAur, does that mean the maxiumum operating pressure at the top experansion tank is the High Pressure which required by the ASHRAE equation. Actually, our Boiler PSV setting point is 150 psig as well. However, the discharge pressure of circulation pump is 35 psig. Can I use this 35 psig...

Thank you, Yorkman: Yes, it's a closed expansion tank with air/water interface. For the high pressure, you are saying is usually set by the maximum pressure allowable at the safety relief valve without opening. Is the safe valve located on expansion tank? For our system, we have a PSV set at 150...

Does anybody can help on how to determine the Low pressure and High Pressure when calculate an expansion tank for heating system by using ASHRAE Fundamentals?

1. How to determine if pipe/equipment need stress relieve? 2. How to do the stress relieve for the piping during assembly in the shop? Much thanks, Joan

what is binary interaction parameters?