Fixing pipework for Bottom drains.

When all the pipework is completed, and the solvent has completely cured it is very important to put a full pressure test on the pipework to ensure there are no leaks before you start concreting.

TIP. When using pressure pipe you will often find that some of the fittings are very tight when trying to fit them together in a dry state. Do not worry because as long as there are no burrs or marks on the pipe or fitting they will slide fully home when the solvent is applied. You will often find some fittings are looser than others and these can be put aside and used where you have to put the fitting at a particular angle.

Let us now look at piping for Purging the bottom drains.


A Guide to Modern Koi Pond Construction Fixing pipework for bottom drains
We have looked at bottom drains, fitted them in position, and when we are happy with this it is now time to glue them into their final position.
	It is very important especially when fitting short lengths of pipe to make sure that your measurements are accurate. It is equally important to ensure that the pipe is cut perfectly square otherwise your measurements can be wrong. I have found that the best and easiest way to cut the pipes is to use the tool shown in the photograph. This can be purchased from most "do it yourself" shops for less than £20, and will give you a straight cut every time.
	When the pipe has been cut then it is necessary to remove all the rough burrs using a knife and emery cloth. When this has been done and all parts are ready for the glue to be applied the surface should be cleaned with wire wool.
	With most types of glue or solvent it is necessary to use a cleaner. This will remove any impurities that may be on the surface of the pipe or fitting. Be sure to read the instructions on the tin before starting.
	It is important to check with the supplier which is the correct solvent to use with the particular type of pipe you are using. Apply the solvent to the surfaces of both the pipe and the socket to which you are attaching it, fit the parts together quickly, and hold in position for a short while. The solvent sets in position very quickly so make sure you have the final position carefully marked before you start. If the solvent is supplied with a small brush like the one in the photo it is a good idea to use a ½ ins (12mm) paint brush as the original brush is only suitable for small pipes.
When all the pipework is completed, and the solvent has completely cured it is very important to put a full pressure test on the pipework to ensure there are no leaks before you start concreting.
	One of the ways to test the pipes is to use the type of stopper shown here. These are available from all builders' suppliers. One should be fitted inside the pipe in the bottom drain, and then the pipe can be filled with water using a hose pipe. Many people consider this is a suitable test, but if you wish to apply pressure to the pipe you can attach another stopper at the other end of the pipe. These stoppers have a hollow centre tube so a fitting can be attached so that the hose pipe can be fitted to produce the pressure. It is important to fit a pressure guage so you can regulate the pressure.
TIP. When using pressure pipe you will often find that some of the fittings are very tight when trying to fit them together in a dry state. Do not worry because as long as there are no burrs or marks on the pipe or fitting they will slide fully home when the solvent is applied. You will often find some fittings are looser than others and these can be put aside and used where you have to put the fitting at a particular angle.
Let us now look at piping for Purging the bottom drains.
This page last updated August 2004
This website started with a booklet which I made up originally for the help of those members of the BKKS - South Wales Section who were intending to start building a koi pond, and as the website has expanded more information and articles from other people have been included. This is for general guidance only, and we do not take any responsibility for problems that might occur by following these ideas. It is important that you check out everything in your area, and check on local laws and rules that may apply.
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