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WATER SUPPLY PIPE WHISTLE NOISE - CONTENTS: diagnose the causes of water pipe noises of whistling or shrieking, or vibration. Other types of building pipe noises both in the supply system (such as water hammer or pipe vibration) and in the plumbing drain system (such as gurgling drains) are discussed in companion articles linked to at More Reading at the end of this article. I am not sure what to do, as I am selling my house and I don't want someone to turn them on and hear that and be turned off.
A couple people have said [that I should] turn all the water faucets on at once for 5 minutes, as that would work. I just want a professional, easy solution, because I can't hear [the pipe whistling sound] when the outside hose front or back of the town house are on.
Water supply piping noise complaints are usually related to the pressure and flow velocity of water in the piping system. At PLUMBING NOISE CHECKLIST we note that plumbing noises that produce high-pitched hissing or whistling sound may be heard as water runs through building supply piping. You may be able to stop or reduce plumbing supply piping noise by changing the water system pressure at a municipal water supply valve. If you think that this problem was not present when the building was new but has been getting worse over time, that argues for a mineral deposit or debris deposit, possibly along the length of piping but also possibly in a faucet, control, even a fixture spout strainer that is having effect.
Mineral deposits, if that is a factor in pipe noise (see corrugated piping noise research cited below), won't disappear by simple flushing.
If you think that the problem has always been present then I suspect a pipe layout, design, support, or one or more individual valves, controls, or even a pressure tank problem. Watch out: while you're inspecting the plumbing system be alert for lead supply piping (red arrow in our photo) that may be at end of life or might be a health concern, and look for leaks, inadequate pipe support, or other stuff you failed to notice that you might fix before a plumbing leak becomes a catastrophe. I'm doubtful that just running all the faucets for an interval will fix a pipe noise, except on the slight chance of flushing out a bit of debris somewhere that happens to block flow so as to cause the flow rate to set up a harmonic vibration or cavitation in the piping system. But because unlike heating systems, water flows in building piping generally at higher pressures and flow rates than in hydronic heat (where air traps are more common), I'd expect air to be forced through the piping and discharged at faucets even if there was a recurrent source of air in the system (such as a well piping or control or air volume control defect ). I have found a range of plumbing noises, banging, clanking, and whistling that occur when water is run in some buildings and that would diminish or stop entirely when we changed the flow rate to faster or slower than a critical rate that seems to set up a vibration in the system. Sometimes even a small flow rate such as a filling toilet can cause a horrible shrieking or whistling in the supply pipe system, so I infer that the sound is not simply caused by a high flow rate.
A squealing water pressure tank sound is often due to water passing through a restricted valve or pipe clog. Shrieking from a water pressure tank that incorporates a bladder may be due to a partly collapsed bladder or obstruction at the tank entrance fittings.
Before beating whistling or shrieking pipes into a quiet state we should be quite confident that the building noise complaint is only related to water supply piping, that is, the whistling or shrieking sound is not related to or caused by the drain system, and more suitably, not related to hot water heating equipment nor hydronic or steam heating system noise. Still more building shrieks and whistles not due to mechanical systems have been traced to wind noise, swinging signs, loose chimney caps, even odd roof shingle defects. A high pitched shriek or whine also occurs during fill-ups of water tanks whose water level is controlled by a float. Some discussion of the effects of holes in piping systems and the causes of cavitation inside the piping system is in order. For example at our offices in Mexico water is supplied by intermittent, varying pressures in the street water mains from which water is pushed by city pressure to a rooftop water storage tank. I have observed that at times when our rooftop water tank is filling the whole water system produces a horrible shrieking sound that some visitors describe as water pipe whistling.
I find that while the pipe whistle-shriek is active, if I zoom over to the main water shutoff-valve and close it slightly, the shrieking stops immediately. This sound does not always occur, depending probably principally on the supplying water main pressure but possibly on other variables in temperature, even barometric pressure, or the condition of the water tank float valve.
I don't claim this is the only possible explanation of water pipe whistles but it seems a likely one.
We also observed both whistling and banging clanging water hammer in the water supply piping system of the Casa Azul hotel in Queretaro, Mexico - an incredibly loud sound that would appear or disappear depending on how many fixtures were in use and probably on variations in the hotel's water supply pressure. Have you tried, during the whistling, various measures to amend the flow rate of water such as turning the main water supply valve slightly more towards its closed or open position?
Besides these research citations on water pipe noises, people have invented things intended to silence the pipe whistle. Below we include a list of pipe noise reduction measures, starting with a few installation details.
JGL Acoustics recommends that the maximum water flow rate in gallons per minute in a building piping system ought to be 4 feet per second.

Separately, Canadian CMHC research (1996) found that increasing water pressure increased the noise level in buildings by +5 dBA to +9dBA when water pressure increased from 40 psi to 100 psi (which is high and well above recommended in-building water supply pipe pressures). Confirm that the whistle or shriek is due to plumbing: a quick test is to shut off the water supply when you hear the noise.
Secure loose water supply pipes: on occasion we find pipes that vibrate and wiggle around, perhaps due to cavitation or other water movement inducements. Reducing water pressure or flow velocity is the single quickest, least costly step that should reduce building water pipe noise generation.
Suspended building systems including equipment, ductwork and piping are either noise and vibration sources or paths which can transmit vibrations into the supporting structure. Noise from plumbing fixtures can be a source of great annoyance in single-family and multi-family homes. A study funded by Canada Mortgage and Housing Corporation and undertaken by MJM Acoustical Consultants* at NRC examined the changes in noise level produced by different types of pipes, different methods of mounting pipes, different wall types, and the addition of sound absorbing materials in walls. Nakiboglu, Gunes, Stefan PC Belfroid, Devis Tonon, Johannes FH Willems, and Avraham Hirschberg. Continue reading at WATER HAMMER NOISE DIAGNOSE & CURE or select a topic from the More Reading links or topic ARTICLE INDEX shown below. Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. I brought my machine to the dealer for the same reasons you had SRSCREW900, and the noise has stopped! I just purchased a 2015 900 crew making the same noise (high pitch rattling noise) coming from the motor area.
Also you could try this, start your rig and spray some carb cleaner around the area you think the squeal is coming from. You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. If you have any problems with the registration process or your account login, please contact us.
I get a very high-pitched whistling sound from behind the passenger seat - it sounds almost like feedback from a speaker (yup - already checked whether that was the problem, but no dice). After searching the BB threads, I decided to check out the barometric pressure sensor, thinking that the diaphragm had failed. Given that the sound varies with throttle application, I had thought that it was related to the amount of vacuum in the intake manifold (hence why I thought that the sensor had a line running to it).
Here we discuss the causes of water supply piping noises such as whistles or shrieks, we cite pipe noise research, and we explain how these whistling pipe noises can be cured or prevented in the first place. Nor do I hear the pipes shrieking when the bath room basin, bathtub, clothes washer are in use, nor when you flush toilets.
Because water pipe noises tend to be greater at higher pressures or velocities, often we can immediately stop the noise by adjusting water pressure OR water flow rate. This sound should stop immediately when you turn off any fixture that is running water in the building.
It is possible to trap a bit of air inside of a horizontal water (or hot water heating system) pipe, and I agree that at least in theory the effective reduced diameter of piping in the area of air trap might be related to pipe noises. In that case the noise seems to come from a combination of stick float mechanism that may not fully open the fill valve and thus a partial restriction in the water line. I suspect, based on limited field testing and a review of research literature that cavitation may explain some water pipe whistling and shrieking. I speculate that the noise is due to cavitation in one of two locations: the inlet water main valve or the float valve that controls filling of the water storage tank. But the key steps in managing pipe whistling and vibration caused by water flowing through the piping system involve adjusting the pressure and flow rate in the system.
We list some noise isloating pipe hanger suppliers under plumbing noise silencer devices below. If the water pressure regulator is the noise source consider changing the brand or model of the control. Often closing the valve slightly, or opening it if the valve was mostly shut, will change the flow rate enough to stop water pipe cavitation noises at the fixture.

Structural floor, ceiling and roof systems act as sounding boards, turning these vibrations into audible noise.
Our hangers are typically installed inline with threaded rod supports to break the rigid support path. Hunaidi at Canada's NRC who studied plumbing noise found that plastic piping is about 10 dBA less noisy than copper pipes when both are rigidly clamped. They indicate that you and I are not totally weird in looking for a solution to water pipe sounds. A research project conducted in the acoustical laboratory of the National Research Council of Canada, on behalf of the Canada Mortgage and Housing Corporation. Noise-control articles and textbooks usually recommend the use of resilient supports for pipes and other fixtures as a means of controlling noise. Noise sources used included an ISO standard plumbing noise source, a toilet, a sink, and five common bathroom faucets. The text is intended as a reference guide to help building owners operate and maintain their home effectively. My rig is making a very high pitch whistle noise only during the winter months and when the jeep is coasting. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. I put a Cosmo CAI on my car and the filter it comes with is crap and whistled, so i bought just an ebay one with hopes it just wouldn't whistle and it still whistles. I have messed with dozens of different intake setups and never got a whistle, only sucking noises. The problem is not with the barometric compensator, which sends an atmospheric pressure signal to the fuel ECU, but with the vacuum sensor, which sends engine load info to the ignition ECU. I just saw that could have been turning the outside faucets off could have caused backed up the air in pipes. You can demonstrate the hypothesis that cavitation occurs in some water control valves at some valve positions by opening or closing the valve just slightly from its current position.
Rigid pipe supports such as metal strapping, clamps, or even the plastic J-hook tpe support are the greatest source of pipe noise tranmission in buildings.
Other than simply adjusting the valve to a lower rate, this may be the least-costly step in shutting up screaming pipes. Vibro-Acousticsa€™ uniquely-engineered springs are used for low frequency vibrations, and our elastomeric isolators help absorb high frequency vibrations. However if you use noise-isolating plumbing supports either pipe material will be equally quiet.
The objective of this research was to determine the acoustical performance of various pipes and plumbing installations; the report is available in both French and English. Closed cell rubber foam supports were found to be the most effective of the resilient materials tested, providing reductions in A-weighted noise levels around 20 dB.
I would drive down the street for about 30 seconds and it would start to whine really loud only when the engine wasnt under load. Cost me about $40 total for parts and took about 4 hours on a Saturday to complete and this was my first attempt. Steering pump has 2 bolts on top 1 on bottom and easier to use a ratchet by going through the pulley. Brought a AEM cone (or other brand that has a built in stacker to smooth the transition) and my noise went away. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Thinking it's the manifold gasket or headers for both problems or the water pump for the squeal.

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