eclipseflight7
Posts: 482
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Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 1:43 pm

What is it? All I know is that it goes in a 747, somewhere...
Holy sh*ts and burritos.
 
SFOMB67
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 2:36 pm

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
 
joness0154
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 4:04 pm

Are you talking about the accumulator?
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troubleshooter
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 4:20 pm

This job sucks!!! I love this job!!!
 
SFOMB67
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 6:46 pm

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
 
PhilSquares
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 8:00 pm

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.
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HAWK21M
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 8:17 pm

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
I may not win often, but I damn well never lose!!! ;)
 
charliecossie
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RE: Hydraulic Pressure Resonance Suppressor

Wed Jan 18, 2006 11:14 pm

Known as a "ripple damper".
Additional to the accumulator.
Doesn't have to be mounted at the pump.
 
Dougloid
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 12:43 am

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.
If you believe in coincidence, you haven't looked close enough-Joe Leaphorn
 
Okie
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 2:08 am

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
 
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HAWK21M
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 2:40 am


One type.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
SFOMB67
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 4:33 am

So I take it that this pulsation damper is the same thing as a pressure resonance suppressor ?
Not as easy as originally perceived
 
Okie
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 5:27 am

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
 
eclipseflight7
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RE: Hydraulic Pressure Resonance Suppressor

Thu Jan 19, 2006 6:58 am

Freaking amazing what you guys know.

Thanks.
Holy sh*ts and burritos.

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