munirabbasi Posted December 17, 2020 Share Posted December 17, 2020 Hello Herks Hydra Expertise! 1. It has mentioned Intermediate level maintenance T.O of EDP NYAB at 3000 RPM , flow rate of pump is 6 GPM min, where pump is designed 10 GPM at 3650 RPM . when both the pumps (NYAB) In Aircraft utility system working parallel max flow ie 16.93 pressure drop to 1800 psi. how we can calculate flow rate (GPM) of both NYAB pumps when they are working parallel at 3000 RPM? 2 Just assume that aircraft hydraulic utility system ,when No 1 EDP pressure is 3000 psi and No.2 EDP pump pressure 3100 psi how the pressure act passes thru passage of single pipe after isolation check valves ? Best Regrads Munir Abbasi Home Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted December 18, 2020 Share Posted December 18, 2020 1. I will have to double check but I think the 3k RPM is low speed ground idle and 3.6K RPM is normal ground idle (engine at 100% rpm) Why would you ever need to figure out the GPM at low speed ground idle? You would never fly at that engine RPM 2. Pressure equals out. If you had 3K and 3.1K you would probably see a little bit above 3K by the time the pressure equalized and got to the pressure transmitter at the utility or booster panels. Pressure drop is roughly 100 psi every 50 feet (not written down anywhere just what I have seen) Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 18, 2020 Author Share Posted December 18, 2020 4 hours ago, hehe said: 1. I will have to double check but I think the 3k RPM is low speed ground idle and 3.6K RPM is normal ground idle (engine at 100% rpm) Why would you ever need to figure out the GPM at low speed ground idle? You would never fly at that engine RPM 2. Pressure equals out. If you had 3K and 3.1K you would probably see a little bit above 3K by the time the pressure equalized and got to the pressure transmitter at the utility or booster panels. Pressure drop is roughly 100 psi every 50 feet (not written down anywhere just what I have seen) Thanks for Marvelous response. Your services for Hercules operators will be remember in godlessnesses wards forever. Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 29, 2021 Share Posted January 29, 2021 On 12/17/2020 at 8:40 AM, munirabbasi said: Hello Herks Hydra Expertise! 1. It has mentioned Intermediate level maintenance T.O of EDP NYAB at 3000 RPM , flow rate of pump is 6 GPM min, where pump is designed 10 GPM at 3650 RPM . when both the pumps (NYAB) In Aircraft utility system working parallel max flow ie 16.93 pressure drop to 1800 psi. how we can calculate flow rate (GPM) of both NYAB pumps when they are working parallel at 3000 RPM? 2 Just assume that aircraft hydraulic utility system ,when No 1 EDP pressure is 3000 psi and No.2 EDP pump pressure 3100 psi how the pressure act passes thru passage of single pipe after isolation check valves ? Best Regrads Munir Abbasi Home Hercules Pakistan Question #1: No idea on GPM @ 3000 rpm between 6 and 12 is all I got on that... Question #2: Just assume that aircraft hydraulic utility system ,when No 1 EDP pressure is 3000 psi and No.2 EDP pump pressure 3100 psi how the pressure act passes thru passage of single pipe after isolation check valves ? The 3000 PSI pump will be at zero flow because the pump compensator (set at 3000) is satisfied with the pressure. The isolation check valve for this pump will be closed due to the 3100PSI being applied to the check valve preventing it from opening. The 3100 PSI output pump (compensator is set incorrectly) will displace fluid to maintain 3100 PSI, it's isolation check valve will be open and the system pressure gauges will read 3100. As hydraulics are used the pressure will drop and the 3000 PSI pump will be allowed to help out but only until the 3100 PSI pump builds its pressure back to 3100, then the 3000 pump will again go to zero flow condition. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted January 31, 2021 Author Share Posted January 31, 2021 On 1/30/2021 at 12:45 AM, NATOPS1 said: Question #1: No idea on GPM @ 3000 rpm between 6 and 12 is all I got on that... Question #2: Just assume that aircraft hydraulic utility system ,when No 1 EDP pressure is 3000 psi and No.2 EDP pump pressure 3100 psi how the pressure act passes thru passage of single pipe after isolation check valves ? The 3000 PSI pump will be at zero flow because the pump compensator (set at 3000) is satisfied with the pressure. The isolation check valve for this pump will be closed due to the 3100PSI being applied to the check valve preventing it from opening. The 3100 PSI output pump (compensator is set incorrectly) will displace fluid to maintain 3100 PSI, it's isolation check valve will be open and the system pressure gauges will read 3100. As hydraulics are used the pressure will drop and the 3000 PSI pump will be allowed to help out but only until the 3100 PSI pump builds its pressure back to 3100, then the 3000 pump will again go to zero flow condition. Thanks Munir Abbasi Quote Link to comment Share on other sites More sharing options...
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