Banging or knocking boiler noises are a reliable indication that something is wrong with your heating system. Making sure that you not only trace the root cause of the problem, but also get it fixed, is necessary if you want to increase both the heating efficiency and the lifespan of your boiler. The following are some of the common causes of boiler noises that you should know.
When your heating system's valves are defective, they can introduce air into the system. Air can also be introduced into the system through loose joints and splits in the piping system. The pressure differences between the introduced air pockets and the pressure of the steam in the boiler could then cause turbulence in the system, something that may then produce noises that are loud enough to disturb the peace in your home.
An easy way to get rid of noises caused by air leaks is by using the system's bleed valves. However, for as long as the air openings exist, bleeding will be a temporary solution. The best way to completely get rid of these noises is to first tighten any loose joints, and then replace any leaking pipes and valves before doing the bleeding.
Restricted water supply
Boiler systems are usually designed to handle a given amount of water at a go. This usually guarantees an efficient heating process while also preventing unnecessary problems such as overheating. A problem will therefore arise if you have water pressure or water supply problems since the water flowing into the boiler may not be enough to dissipate the boiler-generated heat as fast as it should. This may then cause the available water to boil and hence producing a "kettling" sound.
The most common causes of restricted water flow include the freezing of water supply piping, defective valves, and in some cases, errors in setting the heating system's supply flow rate. Replacing any faulty valves, adjusting the flow rate settings and unfreezing frozen pipes are thus some of the ways through which you can get rid of these noises.
Mineral build up
Heating usually causes the minerals in water to crystallize. In a boiler, these minerals sometimes get deposited around the heat exchanger. This then creates a problem because the deposit accumulation is usually uneven, something that creates hot and cold heating spots around the heat exchanger. As a result, water in some spots will boil faster while in some spots, it will boil at a slower rate. These differences in heating rates may then create violent outbursts that may be to blame for your boiler water problems.
An easy way to get rid of the accumulated deposits is to use an additive product that can help to accelerate the rate at which the deposits dissolve. Draining the system thereafter will be enough to restore your boiler to a normal noise-free functioning state. Contact a repair tech, like Rickett Industrial Environmental Systems, for more help.