Pipes are manufactured with a number of different types of materials like ceramic, fiberglass, metal, concrete and plastic of which the plastic drainage pipes are the ones which are most commonly used all over the world. There are a number of reasons due to which plastic is the preferred material for drainage pipes and some of the attributes of this material in this regard are light-weight, resistance to chemicals, its non-corrosive properties and its easy malleability due to which it can be connected without putting in much efforts.
Plastic drainage pipes are used in many countries of the world for the purpose of drinking water distribution and waste water mains and some of the commonly used types of plastic for these applications are polyvinyl chloride, chlorinated polyvinyl chloride, fiber reinforced plastic, polypropylene and polyethylene.
Installation of these pipes is carried out in a number of steps and there are some precautions as well which should be kept in mind while performing the job. Plastic pipes are prone to expansion and contraction and therefore the worker should either mount the pipes or make use of metal strapping in form of 'plumber's tape' to accommodate the change in size.
It is owing to this reason that the plastic drainage pipes should not be bound rigidly at their ends and should have some gap between them. Plastic pipes also need to be protected from nails by fitting them with pre-punched and nailed-on steel straps along with installing water hammer resistors and air chambers at each and every fixture. While joining these plastic pipes to the existing pipes one should make use of slip couplings and align the two pipes carefully before sealing the merger. When the plastic drainage pipes are buried in the ground, precaution should be taken that there are no rocks and that the pipes are laid firmly on the trench bottom and not on soft-fill.
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