Katmar-
I'm trying to find the maximum gas flow through a hung-open control valve to size needed venting capacity on a downstream tank. The valve in question is a LCV, so in the event of gas blowby, i want the tank relief adequate. Currently the tank has a relief capacity of approx 8mmscfd, so...
So, after all this i've now found the published Cv values for the valves, which has me all confused.
The published Cv value for a 3/4" reduced port 2" body valve is 13.11 at 100% open. Using equation 3-16 from the Crane manual equates to a K value of only 82.9 (assuming i use 2" for d opposed...
Thanks to all for the comments.
Pleckner - I had the same for the K value, and used the values you described for the expansion and pressure ratios. I guess i just found it curious that Crane didn't have any examples with higher K values/reduced porting, as they seem to be pretty prevalent in...
Patricia - Thanks for the reply. Are you sure that I need to multiply formula 7 for K2 by the friction factor? Referencing pgs A-26,27, I use the friction factor (Ft) to find K1, which is then used in the formula to find K2, my overall resistance coefficient for the valve. As a quick check, the...
Quick question regarding the Crane 410 manual and reduced port globe valves. Is there a limit to the resistance coefficient (K factor)? Using A-26, 27 I'm getting some very large K values and can find no examples anywhere of K values over 100. Also, if my K value is over 100, is my expansion...
Looking for some clarification on part 6.5 of API RP 500, specifically around subpart e. Subpart e states that when gas detection sniffs 40% LFL, power must be cut from all electrical devices that are not suitable for Div 2. The way i'm interpreting this is that i can have an inadequately vented...
