Fisher FirstVue is a good. Similarly, Performance 9.? (I forget the latest revision) is very good. Be careful utilizing noise figures predicted by the sizing programs. Many utilize "in house" formulas/factors/voodoo to generate noise figures. The last program I wrote utilizes the ISA algorithm...
Better yet, because of the sheer mass of the valve, many 6D pipeline ball valves (>12" NPS) can pass API fire test requirements without having to rely on additional "firesafe" seals because it's extremely difficult to introduce enough heat into the test environment to compromise the soft seals...
Although adjustable chokes are frequently "calibrated" in 64ths equivalent bean size, it is unlikely that you'll be able to cross-reference the opening to an orifice plate. Additionally, the Fl and Xt values would have to be known across the entire flow characteristic of the adjustable choke. To...
Contact your choke supplier and provide them with the range of flows, operating temperature, upstream and downstream pressures and let them "size" their product for you.
don f.
