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Hydraulic Pressure Resonance Suppressor

EclipseFlight7 From Somalia, joined Apr 2004, 516 posts, RR: 2
Posted (7 years 4 months 2 days 19 hours ago) and read 4782 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

Sfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 1, posted (7 years 4 months 2 days 18 hours ago) and read 4770 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

Joness0154 From United States of America, joined Nov 2005, 667 posts, RR: 0
Reply 2, posted (7 years 4 months 2 days 16 hours ago) and read 4761 times:

Are you talking about the accumulator?

I don't have an attitude problem. You have a perception problem

Troubleshooter From Germany, joined Feb 2005, 423 posts, RR: 5
Reply 3, posted (7 years 4 months 2 days 16 hours ago) and read 4757 times:

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

This job sucks!!! I love this job!!!

Sfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 4, posted (7 years 4 months 2 days 14 hours ago) and read 4751 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

PhilSquares From , joined Dec 1969, posts, RR:
Reply 5, posted (7 years 4 months 2 days 12 hours ago) and read 4742 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.

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 6, posted (7 years 4 months 2 days 12 hours ago) and read 4740 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!

Charliecossie From Germany, joined Oct 2001, 467 posts, RR: 10
Reply 7, posted (7 years 4 months 2 days 9 hours ago) and read 4735 times:

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

Dougloid From , joined Dec 1969, posts, RR:
Reply 8, posted (7 years 4 months 2 days 8 hours ago) and read 4716 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.

Okie From United States of America, joined Jul 2003, 2346 posts, RR: 3
Reply 9, posted (7 years 4 months 2 days 6 hours ago) and read 4710 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

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 10, posted (7 years 4 months 2 days 6 hours ago) and read 4701 times:

One type.
regds
MEL

Think of the brighter side!

Sfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 11, posted (7 years 4 months 2 days 4 hours ago) and read 4684 times:

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

Not as easy as originally perceived

Okie From United States of America, joined Jul 2003, 2346 posts, RR: 3
Reply 12, posted (7 years 4 months 2 days 3 hours ago) and read 4678 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