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Hydraulic Pressure Resonance Suppressor  
User currently offlineEclipseFlight7 From Somalia, joined Apr 2004, 518 posts, RR: 2
Posted (8 years 11 months 2 weeks 2 days 23 hours ago) and read 9649 times:

What is it? All I know is that it goes in a 747, somewhere...


Holy sh*ts and burritos.
13 replies: All unread, jump to last
 
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 1, posted (8 years 11 months 2 weeks 2 days 22 hours ago) and read 9638 times:

Don't know for sure, but I'd guess it's located on the engine, just downstream of the eng hyd pump. Removes pulsation generated by the pump.


Not as easy as originally perceived
User currently offlineJoness0154 From United States of America, joined Nov 2005, 667 posts, RR: 0
Reply 2, posted (8 years 11 months 2 weeks 2 days 21 hours ago) and read 9629 times:

Are you talking about the accumulator?


I don't have an attitude problem. You have a perception problem
User currently offlineTroubleshooter From Germany, joined Feb 2005, 423 posts, RR: 4
Reply 3, posted (8 years 11 months 2 weeks 2 days 21 hours ago) and read 9625 times:

Check out this link: http://www.wilkesandmclean.com/pages/whatis.html


This job sucks!!! I love this job!!!
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 4, posted (8 years 11 months 2 weeks 2 days 18 hours ago) and read 9619 times:

Quoting Joness0154 (Reply 2):
Are you talking about the accumulator?

No. I remember an item attached to the pressure line off the EDP on 762 engines, with JT9-7R4's. About 5" dia x 4" that I believe was supposed to dampen surges from the pump. Don't remember it on the 763's though, but it's been a few years. This sounds like a similar item.



Not as easy as originally perceived
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 5, posted (8 years 11 months 2 weeks 2 days 17 hours ago) and read 9610 times:

Quoting Sfomb67 (Reply 4):
No. I remember an item attached to the pressure line off the EDP on 762 engines, with JT9-7R4's. About 5" dia x 4" that I believe was supposed to dampen surges from the pump. Don't remember it on the 763's though, but it's been a few years. This sounds like a similar item.

Sounds like the description of a hydraulic accumulator.


User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 6, posted (8 years 11 months 2 weeks 2 days 17 hours ago) and read 9608 times:

Quoting Sfomb67 (Reply 4):
About 5" dia x 4" that I believe was supposed to dampen surges from the pump.

I think you are talking about the Hydraulic Damper assy mounted on Some EDPs of Abex version mounted on the Pump.
regds
MEL



Think of the brighter side!
User currently offlineCharliecossie From Germany, joined Oct 2001, 479 posts, RR: 9
Reply 7, posted (8 years 11 months 2 weeks 2 days 14 hours ago) and read 9603 times:

Known as a "ripple damper".
Additional to the accumulator.
Doesn't have to be mounted at the pump.


User currently offlineDougloid From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 11 months 2 weeks 2 days 12 hours ago) and read 9584 times:

Quoting Charliecossie (Reply 7):
Known as a "ripple damper".
Additional to the accumulator.
Doesn't have to be mounted at the pump.

Or a "snubber". Ever have a water hammer in your residential supply? Same thing in hydraulic systems unless you install a snubber. An accumulator which is permanently connected does the same thing but there are systems that don't utilize an accumulator.


User currently offlineOkie From United States of America, joined Jul 2003, 3197 posts, RR: 3
Reply 9, posted (8 years 11 months 2 weeks 2 days 11 hours ago) and read 9578 times:

Pulsation Damper would be the correct term. Generally used in high pressure pump applications to decrease vibrations induced into the system, hydraulic in this case, generated by the pump as each piston/vane/gearoter discharges into the high pressure side of the system and causes vibration.

While somewhat similar to an accumulator the devices are pretty much "tuned" for lack of a better word for the frequency/quantity of fluid discharged by each piston/vane/gearoter displacement and pressure of the system. They do not store pressurized fluid like an accumulator for later or short term demands that exceed the pump capacity.

A friend of mines dad was in that business for years and built Pulsation Dampers for all types of hydraulic and pump applications from small 3 gpm hydraulic pumps that would fit in the palm of your hand to some mongo units used in oil field pumps for offshore production that were 36" in diameter and 10 feet long.

Okie


User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 10, posted (8 years 11 months 2 weeks 2 days 10 hours ago) and read 9569 times:


One type.
regds
MEL



Think of the brighter side!
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 11, posted (8 years 11 months 2 weeks 2 days 8 hours ago) and read 9552 times:

So I take it that this pulsation damper is the same thing as a pressure resonance suppressor ?


Not as easy as originally perceived
User currently offlineOkie From United States of America, joined Jul 2003, 3197 posts, RR: 3
Reply 12, posted (8 years 11 months 2 weeks 2 days 7 hours ago) and read 9546 times:

Quoting Sfomb67 (Reply 11):
pulsation damper is the same thing as a pressure resonance suppressor ?

I would say close enough Sfomb67

I am not familiar with aircraft pump speeds and designs but a typical industrial application using a standard NEMA 1750 rpm motor and a 9 piston pump you are looking at 15,750 pulses/min or 262.5 pulses/sec. for frequency. Pressure, frequency, line size and volume of piston/vane displacement is calculated for a proper fit of a pulsation damper. Most designs I have seen are mounted directly to the pump or within a very short distance of the pump. The two most popular designs I have seen were "inline" similar to what Troubleshooter linked or a "right angle" design that mount directly to the pump discharge. The design that HAWK21M has a picture of I have only seen in "system" pulsation damping where you are dampening very low frequency applications, opening and closing of valves in the hydraulic system although they would probably work to some degree for pump dampening.

Okie


User currently offlineEclipseFlight7 From Somalia, joined Apr 2004, 518 posts, RR: 2
Reply 13, posted (8 years 11 months 2 weeks 2 days 6 hours ago) and read 9536 times:

Freaking amazing what you guys know.

Thanks.



Holy sh*ts and burritos.
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