A plastic pipe testing laboratory is a laboratory with the facilities needed to test the polymers that go into the construction of plastic pipes
. These plastic pipes are designed from polymers which are molecules bonded together using a chemical compound often a carbon compound. This then is usually constructed synthetically in a laboratory in order to create a plastic polymer that has the specific features that you need for your application. This then allows the developers of the plastic pipes to create plastics and other polymers suitable for their specific needs and that won't break or leak.
You might think that a plastic pipe is something that doesn't require too much thought or engineering but you would be very wrong and actually there are many challenges that developers face when developing plastic pipes, similar to those faced by people developing liquid containers. The basic idea behind a plastic pipe testing laboratory is to test that the polymers and the design of the pipe can stand up to weathering and heavy use over a prolonged period of time, and this is crucial for ascertaining whether or not it is suitable for that job.
There are actually many important challenges that are faced when designing plastic pipes. For instance you will initially need to confront the fact that the liquid running through can damage many materials and it's important to make polymers that will stand up to this. If your plastic pipes are for guttering or heating and will just carry water, then you will already have the challenge of the friction caused by water which can erode your surfaces. Furthermore, if you have water then you have condensation which is also corrosive.
Further though, you might be using a plastic pipe testing laboratory in order to test pipes that are facing bigger challenges than just water. For instance if the plastic pipes are attached to chemical tanks then this will mean that they are transporting a range of potentially hazardous and corrosive materials. This is why it's so important that they don't spill or leak, but it's also another challenge and it's important to create plastic pipe polymers that won't react with the chemicals inside and that also won't alter their composition. You need to think about everything going through the pipes and that won't necessarily just include things that should be in there.
Then there's weathering and temperature changes which are of course an even bigger concern if your plastic pipes are located outdoors in which case they will encounter the sun which can cause plastic pipes to expand and alter in size (potentially placing stress on the construction), as well as freezing which can cause your plastic pipes to freeze solid and rigid making them more brittle (and which can expand and contract the liquids inside).
In some cases you may even want to look at the security aspect of your polymers and make sure that no one can siphon off the liquids you are transporting this way.