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thanks georgeverghese. What the case assumption is: All pumps and fans stop for general power failure case. And fuel gas/oil for fired heater is shut down.

Thanks for your share,georgeverghese. As I know, volume of convection section coils is very big sometimes, so is it too conservative to use total volume when calculating relief rate caused by furnace residue heat? Feed pump stops when power failure, so there is no pressure to charge liquid...

Hi all I have two questions about fired furnace residual heat when calculating relief rate. Fired furnace upstream of crude unit, power failure scenario, furnace goes offline. 1.For dynamic simulaiton, the holdup volume is equivalent to radiant & convection section furnace coil, or just...

@jari001 Thanks. What is your idea about standard elbow in that table from "Transport Phenomena and Unit Operations A combined Approach"?

RVAmeche, thanks for you information, You are very helpful I appreciate it!

Thanks RVAmeche. From Table 3-2 Equivalent Length =30 for 90° standard elbow. There is no definition about standard elbow. Does that mean equivalent length =30 for 90° standard elbow no mater it is threaded joint or flanged/butt welded joint? It is not consistent with Crane TP-410.

Thanks Latexman. K=30ft for 90° standard elbow in many handbooks. There is no definition about 90° standard elbow and joint type is not classified in these handbooks. I'm also sure threaded joint has more pressure drop than flanged/butt welded joint. But all the information got from these...

I was also confused about K value in Perry's chemical engineer handbook. K =0.75 for 90° standard elbow (see table 6-4 in Perry's handbook) and there is no definition about standard elbow as Crane TP410. And K=0.93 for 90° standard-threaded elbow and 0.32 for 90° welded elbow in API 521(see...

Thanks casflo and RVAmeche. I cannot find the definition about standard elbow in Crane Tp-410. Standard elbow is flanged in Figure 2-8, but from picture about standard elbows (see A-30) it is threaded/socket. Because of the big difference (K=30ft or 20ft), I'd like to make it clear. Thanks.

I was confused by the resistance coefficients in Crane. For standard elbows K=30ft while K=20ft(r/d=1) for flanged or butt-welding 90° elbows. There is no any note about standard elbows in Crane. Why there is big difference between standard elbows and others? and what's standard elbow? Thanks in...