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Tommy Walsh's DIY Guide
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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t5h.txt
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1998-10-14
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Summary
There are several different types of waste trap available,
the following steps will help you to choose the one best
suited to your requirements:
1 Waste trap materials
2 Push-fit waste traps
3 Compression-joint waste traps
4 Solvent-welded waste trap joints
5 About waste traps
6 Waste pipe connections
7 Different pipe sizes
Step 1 - Waste trap materials
Waste trap systems are made of high grade polypropylene.
They can withstand intermittent boiling water. This makes
them ideal for waste water pipe systems for kitchens and
bathrooms. The polypropylene does, however, degrade when
exposed to ultra violet light and it is therefore not
suitable for use outside.
Step 2 - Push-fit waste traps
These fittings incorporate an æOÆ ring seal which allows
them to be pushed together after the addition of a lubricant.
The procedure for joining the pipes is relatively simple and
involves chamfering the end of the pipe if it is cut and
removing any swarf, dust or debris form the end of the pipe.
Step 3 - Compression-joint waste traps
Compression joint work on the same principle as is described
in copper pipe compression joint. As with the push-fit waste
system the pipe end must be clean and free of burr. Hand tighten
the nut to create a good seal. Be careful not to over tighten,
as this will damage the olive.
Step 4 - Solvent weld waste trap joints
Solvent welded systems are unaffected by ultraviolet light
so they are suitable for use outdoors. The solvent weld waste
system should be used outside. Pipe and fittings are cleaned
with a solvent cleaner and then glued together.
Step 5 - About waste traps
Traps stop foul smelling air from entering the house by
trapping a small amount of water in the system. This water
is continuously flushed through by normal usage. Specifically
designed waste traps are available for kitchens, waste
disposal units, washing machines, dishwashers, baths and
showers.
Step 6 - Waste pipe connections
The pipe system must discharge to a soil pipe or gully.
Older houses may discharge to an open hopperhead on the
first floor or a secondary stack.
Step 7 - Different pipe sizes
There are three sizes of waste pipes, 32mm, 28mm and 100mm.
The last is for toilets and should be connected to the
soil pipe. If the run is less than 1.7m long you can use
32mm pipe for basins and bidets.