Nettet17. aug. 2015 · Motor suppliers generally depict a turn down ratio, when discussing its use with a VFD, as a simple ratio without qualification as to torque. Indeed, one … Nettet12. jan. 2013 · That should pretty much kick screws out of the mix. In the early days (71 bar to 91 bar) you are doing about 1.3 compression ratios and hp requirements are …

Why Turndown Ratio is important when Selecting a Flow …

Nettet15. nov. 2011 · The main challenge for these facilities is to operate it at lower production capacities at many instaces due to various reasons. The crude oil processing units of these facilities were able to operate smoothly for as low as 25% of design capacity. However, the turn down ratio for gas compressors was limited to 55%. Nettet20. mar. 2011 · Mar 20, 2011. #19. the 3:1 or 4:1 turndown in flow is equivalent to a 9:1 or a 16:1 turndown in measured d/p. you can always respan the d/p transmitter to achieve suitable accuracy at the new flow conditions, as long as you satisfy the Reynold's number limitations of the plate, i.e turbulent flow typically. mart houston

What is Rangeability and Turndown ratio and why is it important?

Nettet16. nov. 2010 · And with these noble intentions in mind, the engineer will specify a VFD for his client. Oftentimes, that isn't the end of the story for the engineer. By John Yoon, PE, LEED AP, McGuire Engineers Inc., Chicago November 16, 2010. Ask an engineer the purpose of a variable frequency drive (VFD), and a common answer would be “to save … NettetThe results of this calculation are shown in Figure 8. With an increasing syngas share, the laminar burning velocities are increasing. For the ϕ = 0.5-case pure methane has a laminar burning velocity of 7.6 cm·s -1, which is increased by a substitution with 50% syngas to 10 cm·s -1, an increase of 32%. Figure 8. NettetSo, suppose a flow meter has a full scale rating of 20 l/min the flow meter will measure down to 0.4 l/min of flow. The Flowrange of the MV-304 is 0.2 .. 20 ln/min (SLM) … mart hotel chicago