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reoccurring water hammer in upstairs toilet

Homerboy

Homerboy

Lifer
About 10 years ago we have a upstairs remodel/addition done.

Over the past year or so, the toilet in the bathroom develops a water hammer after filling. I've flushed the lines and it disappears. I had to redo this a few times over the course of a several months. However now, even after I flush the lines it seems to come back within a week or 2 and I have to flush the lines again and again.

A) Am I crazy in that frequency is increasing? I don't get what changes to the lines could occur to affect that?
B) Is there anything (easy) I can do to prevent the hammer from developing? Can I just get an arrestor like the one linked below and put it in the supply line leading to the toilet?

https://www.amazon.com/Sioux-Chief-...&sr=8-1&keywords=water+hammer+arrestor+toilet


Thanks in advance.
 
Get a plumber to come measure the water pressure or buy a gauge yourself. If I remember correctly, where I live, anything over 80 PSI requires a PRV (pressure reducing valve) to be installed. Pressure varies over time if you are on city water.

My guess to the frequency of the hammer after flushing is that after you fill the supply pipe leading to the toilet (after flushing the line), it is not completely filled and there is an air pocket somewhere, probably trapped under an elbow or along a horizontal run. Air serves to cushion sudden changes in water pressure. With use of the toilet over the following 2 weeks, the air is slowly pushed along until it escapes at the toilet or it gets absorbed into the passing water, removing this cushion. Do you notice the water hammer returning with full force or slowly beginning and getting louder with each use?
 
NetWareHead said:
Get a plumber to come measure the water pressure or buy a gauge yourself. If I remember correctly, where I live, anything over 80 PSI requires a PRV (pressure reducing valve) to be installed. Pressure varies over time if you are on city water.

My guess to the frequency of the hammer after flushing is that after you fill the supply pipe leading to the toilet (after flushing the line), it is not completely filled and there is an air pocket somewhere, probably trapped under an elbow or along a horizontal run. Air serves to cushion sudden changes in water pressure. With use of the toilet over the following 2 weeks, the air is slowly pushed along until it escapes at the toilet or it gets absorbed into the passing water, removing this cushion. Do you notice the water hammer returning with full force or slowly beginning and getting louder with each use?
Click to expand...


Good info.

As for the highlighted, I'd say it's a slow build over the couple of week(s)
 
A quick and easy thing to check is to just partially close the supply valve to the toilet. Instead of having it fully open like most people do, a part-open supply valve has many advantages. You often get a quieter toilet flush, elimination of water hammer, and the ability to turn the supply valve both directions if it gets stuck with age.

It could also be a change in the float valve rather than in the lines. Sometimes as they age (wear or just buildup of crud) they shut off differently than they did before. A few adjustments or replacement of the toilet innards might fix it.
 
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