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Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound.Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, noise in electronics may not be audible to the human ear and may require instruments for detection.In audio engineering, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a hiss. This signal noise is commonly measured using A-weighting or ITU-R 468 weighting.In experimental sciences, noise can refer to any random fluctuations of data that hinders perception of a signal.

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  1. M

    Stopping pipe expansion noise

    I have a nightmare of a job trying to stop pipe expansion joint noise. There are 28mm copper CH pipes down a landing (at right angles to joists) that's 15-20m long, there are several branches and drops to rads. The joists are notched and felted, and the pipes have "Flexej" axials expansion...
  2. U

    Boiler noise with link to sound

    Hi, We've been having this noise on our Valliant combi boiler for a while, 1/2 years+ (link below). Unsure what it might be, perhaps nothing to worry about. Does anyone know what it might be and if it's anything to be concerned about? Link: SndUp | Post info - http://sndup.net/dj3t I've...
  3. J

    Radiator Noise/Issue

    Hello everyone! I purchased this steam vent valve: Hoffman Steam Air Vent 40, 1/8" Angle Steam Radiator Air Valve 401440. Installed it and the hissing is much reduced but now, the hissing happens every 10-20 seconds for about two seconds. Its annoying enough to wake me up at night (I wish I...
  4. D

    Noise from centre heating system

    There is a noise, like a buzz that starts randomly but usually in the early morning. I can't seem to pin it down to one location. I have managed to record the noise and there is a link to YouTube if I'm able to post that? My heating and hot water are both on a gas central heating system, but...
  5. J

    Immersion heater noise

    I had a new water heater element fitted a few weeks ago that heats water at night on economy 7. Previous heater elements have been very quiet but I can hear the new one heating the tank at night. It sounds a bit like a boiling kettle. Is this normal? It’s driving me mad!
  6. B

    Green star exchanger noise

    Green star oil combi heat exchanger noise day and night water whooshing /gurgling
  7. WizPip

    Fast hot water then noise and normal flow after heating hot water

    Hello, I'm a fairly adept DIYer but I have an issue with my plumbing and not entirely sure what's left to check. I have an unvented indirect system with 1 hot / 1 heating zone, cylinder is a Range Tribune HE 150L pre-plumbed. For quite a while now I've had a problem where after the hot water...
  8. Alex1986

    Water pipe running / noise issue

    Hi, I've had an on going issue for over a year now and can't seem to get an answer. Hopefully can get some more information from the forum. If I use the cold or hot water taps in my kitchen or bathroom, 10, 20, maybe 30 mins later it sounds as if the pipes have water running through them, as if...
  9. G

    Noise on boiler startup and shutdown

    Hi all, thanks in advance if there are any ideas. I've got a Worcester Bosch Greenstar combi with Hive thermostat. When the boiler turns on for central heating it makes a weird beep like a gameshow buzzer, a short rumble, then operates normally. Same thing happens when it turns off. But it...
  10. G

    Central Heating noise on ignition and when turning off

    Hi, thx in advance if anyone has any ideas I've got a Worcester Bosch combi with Hive thermostat. Whenever the central heating turns on I get a beep like a gameshow buzzer, and then little rumble. Does the same when turning off. Never does this for just hot water. I had British Gas come out a...
  11. selkhadem

    URGENT Gloworm Ultimate 35c - Clicking noise??

    Hi All, Has anyone ever come across this clicking noise before (see video, starts around 16 secs in)? Just bought a new house with this fitted only 2 years ago. Thanks
  12. L

    PRV Multibloc Valve Strange Noise

    Having a problem with a recent installation. Fitted new unvented cylinder and boiler. Everything fine for 6 months Then I get a call from my customer reporting a water hammer issue. I attend site and fit a shock arrestor. 2 days later he phones me back... still doing it. He says when you open a...
  13. duckbert

    Grundfos MQ3-45 - Weird Noise

    I have a Grundfos MQ3-45 feeding my domestic water from a ground level tank (filled from an RO system from the well). The pump is about 4 years old, with normal-heavy household use. Today it started making a bit of an awful noise - see the attached video. I disassembled the hydraulic end of it...
  14. A

    Noise what water off

    How to stop/cure the high pitched noise bathroom sink that stops when water turned on but then starts again shortly ( time varies ) after water has been turned off. Do not know if relevant but I noticed if I turn on the cold water only, there is first a entirely different lower like noise for...
  15. S

    Any idea what this noise is?

    There is a noise coming from my neighbour's house through the party wall. Sounds like a pump of some sort. They have had a new ensuite installed recently and also a pipe from first to ground floor was leaking and they had it repaired. The noise comes and goes every couple of days. When it is on...
  16. P

    Lining old joist notches to prevent expansion noise

    Has anyone tried lining joist notches with a low friction, high temperature resistant material to prevent the bangs when a pipe expands and momentarily sticks on the joist?
  17. P

    hot water grinding noise

    Hello, when our hot water comes on in the morning and evening there is a deep grinding noise which lasts less than 5 minutes and then stops. After that, all is well. We have a combi boiler. Thanks.
  18. Y

    Inexplicable humming (am I going crazy?)

    Hi All! Bought a house recently, and we have been having the most frustrating issue with a very loud humming noise that intermittently comes and goes in our pipework. Have had a plumber around to check the issue to no avail so far, unfortunately. We have an Ideal Logic+ c35 combi boiler. System...
  19. C

    Noise coming from sprinkler valve

    9-21-22 Hi All: I have always appreciated your comments and troubleshooting recommendations. If I may ask for your thoughts on the following: I have and older Orbit WaterMaster valve. Please see attached photo. I have 4 of these valves in the manifold. I have replaced the diaphragm on all 4...
  20. M

    Please help - thundering noise when I open the hot water tap

    Hello I have no experience in this industry. A few years ago our home was completely stripped apart, remodelled and extended. This required new hot and cold water pipes all over the house, a larger boiler, larger tank and so on - see attached. We wanted the water tank to go into the loft but...
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