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[martin42]

Ive been to a lot off call outs,due to water hammer,its not trapped air,allways the ballvalve on the storeage tank or cisterns,also can happen when turning a tap off which is due to wear in the tap insert,

[Marks DTM Calib]

Its a pressure wave set up in the water once the flow is interrupted quickly .

Although securing pipes will help, it does nothing to address the problem, the only way to do is that something which can absorb the energy e.g. a small pressure vessel (which is what your 30 quid will be buying you).

If there was air in the system it would not bang as that would effectively abosrb the energy

[OOMV6]

Ive been to a lot off call outs,due to water hammer,its not trapped air,allways the ballvalve on the storeage tank or cisterns,also can happen when turning a tap off which is due to wear in the tap insert,

Its a pressure wave set up in the water once the flow is interrupted quickly .

Although securing pipes will help, it does nothing to address the problem, the only way to do is that something which can absorb the energy e.g. a small pressure vessel (which is what your 30 quid will be buying you).

If there was air in the system it would not bang as that would effectively abosrb the energy

Interesting. Of course, I am only noting my own experiences - and those don't include water storage tanks, as we don't tend to have them here.

[Big_Al]

Ive been to a lot off call outs,due to water hammer,its not trapped air,allways the ballvalve on the storeage tank or cisterns,also can happen when turning a tap off which is due to wear in the tap insert,

I would second this opinion.  Strangely it sometimes only happens on  one outlet / tap in the house & not the others.  Just done one on Friday - was only noisy when using the hot bath tap . Noise was located to the cold loft tank ball valve . Changed that  (10 minute job) & happy days  all quiet now.

[Vamps]

We put up with the pipes vibrating after flushing the loo for months, before someone told be to replace the ball valve in the cistern and hey presto peace and quiet again; a cheap and quick fix............

[Marks DTM Calib]

Basic physics people.....water flows with inertia, sudden closure of a valve and the energy has to go somewhere and in this case its a bang as the pipes are vibrated. This will probably occur towards the end of a pipe run or a certain stub

The only real solution is to fit something that can absorb the energy and given that a liquid can not be compressed, you need a gas...hence the shock arrestors (pressure vessel basicly) 

[Marks DTM Calib]

We put up with the pipes vibrating after flushing the loo for months, before someone told be to replace the ball valve in the cistern and hey presto peace and quiet again; a cheap and quick fix............

All you have done is fit a valve which closes slower......all will be well until you get some new taps, a different washing machine/dishwasher....and then it could well all come back. 

[feeutfo]

Not sure on the exact term of water hammer, but we have a problem in our house with banging pipes when the dishwasher or washing machine cut the flow suddenly.

While fitting a new bathroom we had to rip put the boxing around a section of pipe work that travels vertically down to ground level. Non of the pipes in there where secured, and can be seen to shudder when turning the tap off suddenly, or as the dish washer ran they would bang the wall as flow was cut more abruptly.

IMO secure the pipes as a priority, although its not possible to reach ours without pulling the kitchen apart as well. In order to bang they must be able to move. Or turn the water pressure down at the stop cock, think firemans hose and two or three fireman to hold it due to pressure.

IME anyway, presume we're talking about the same thing..?

[Marks DTM Calib]

Not sure on the exact term of water hammer, but we have a problem in our house with banging pipes when the dishwasher or washing machine cut the flow suddenly.

While fitting a new bathroom we had to rip put the boxing around a section of pipe work that travels vertically down to ground level. Non of the pipes in there where secured, and can be seen to shudder when turning the tap off suddenly, or as the dish washer ran they would bang the wall as flow was cut more abruptly.

IMO secure the pipes as a priority, although its not possible to reach ours without pulling the kitchen apart as well. In order to bang they must be able to move. Or turn the water pressure down at the stop cock, think firemans hose and two or three fireman to hold it due to pressure.

IME anyway, presume we're talking about the same thing..?

Yep

But all your doing is treating the symptom and not the cause. 

Pressure waves in your pipe work are not good as they will find the next weakest link 

[TheBoy]

We get it as well, need to pinpoint if its the dishwasher or washing machine - only ever hear it in the early hours, even when those appliances are on during the day. Not sure why.

I think both cold feeds to these are mains feed, hot feed for washing machine is obviously from our tank.

[Taxi_Driver]

We get it as well, need to pinpoint if its the dishwasher or washing machine - only ever hear it in the early hours, even when those appliances are on during the day. Not sure why.

I think both cold feeds to these are mains feed, hot feed for washing machine is obviously from our tank.

I would imagine that your water pressure drops during the day, when everyone is awake and builds back up during the night...

[Kevin Wood]

We get it as well, need to pinpoint if its the dishwasher or washing machine - only ever hear it in the early hours, even when those appliances are on during the day. Not sure why.

I think both cold feeds to these are mains feed, hot feed for washing machine is obviously from our tank.

I would imagine that your water pressure drops during the day, when everyone is awake and builds back up during the night...

Possibly, and, of course, if someone nearby is drawing water, they may dissipate some of the surge.

Look on the bright side, TheBoy. It may eventually take out that water meter, and perhaps the dishwasher, too. You'll have to find something else to moan about then.

[Taxi_Driver]

We get it as well, need to pinpoint if its the dishwasher or washing machine - only ever hear it in the early hours, even when those appliances are on during the day. Not sure why.

I think both cold feeds to these are mains feed, hot feed for washing machine is obviously from our tank.

I would imagine that your water pressure drops during the day, when everyone is awake and builds back up during the night...

Possibly, and, of course, if someone nearby is drawing water, they may dissipate some of the surge.

Look on the bright side, TheBoy. It may eventually take out that water meter, and perhaps the dishwasher, too. You'll have to find something else to moan about then.

I was thinking, during the day, when most peeps are awake, using water, the pressure would drop....and then rise again as peeps goto bed.....
However the cynical me, wouldnt be surprised in the least, if the water boards reduced the pressure when it is least used...ie at night....and then increase it again at say 5am onwards to cope with demand of showers/etc.
This tact would, of course, reduce the amount of water they loose to leaks......and fines? 

[TheBoy]

We get it as well, need to pinpoint if its the dishwasher or washing machine - only ever hear it in the early hours, even when those appliances are on during the day. Not sure why.

I think both cold feeds to these are mains feed, hot feed for washing machine is obviously from our tank.

I would imagine that your water pressure drops during the day, when everyone is awake and builds back up during the night...

Possibly, and, of course, if someone nearby is drawing water, they may dissipate some of the surge.

Look on the bright side, TheBoy. It may eventually take out that water meter, and perhaps the dishwasher, too. You'll have to find something else to moan about then.

Never moaned about the meter being broken. Moaned about the competence of Anglian's contractors, esp when I had to show the retard how to fit it

[Vamps]

We put up with the pipes vibrating after flushing the loo for months, before someone told be to replace the ball valve in the cistern and hey presto peace and quiet again; a cheap and quick fix............

All you have done is fit a valve which closes slower......all will be well until you get some new taps, a different washing machine/dishwasher....and then it could well all come back. 

No, ours was only linked to the flush......