What is BS EN 852-1 - Determination of migration values of plastics pipes about?
BS EN 852 is a series on plastics piping systems for the transport of water intended for human consumption. A plastic piping system is a tubular section, or hollow cylinder, made of plastic. BS EN 852-1 specifies a method for the determination of the migration of constituents from the internal surface of plastics pipes.
BS EN 852-1 is applicable to all plastics pipes to be used for the transport of water intended for human consumption and raw water used for the manufacturing of water intended for human consumption. BS EN 852-1 covers all constituents which are extractable by water from a finished pipe. BS EN 852-1 provides for a change in procedure as necessary depending upon the size of the pipe. For each application and each material, the relevant test conditions need to be stated in the system standard concerned.
Who is BS EN 852-1 - Determination of migration values of plastics pipes for?
BS EN 852-1 on the determination of migration values of plastics pipes is useful for:
- Plastic pipes manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN 852-1 - Determination of migration values of plastics pipes?
Plastics piping systems are used for the conveyance of drinking water, wastewater, chemicals, heating fluid and cooling fluids, foodstuffs, ultra-pure liquids, slurries, gases, compressed air, irrigation, and plastic pressure pipe systems, and vacuum system applications. BS EN 852-1 states that test pieces are subjected to stagnation and prewashing with tap water for a specified time. The test pieces are then filled with the specified test liquid at a specified temperature and kept for a series of specified migration periods. The test liquid is then analysed to assess any constituents which were able to migrate.
The test pieces have an age of at least 14 days after manufacturing the pipe. For each test, take two test pieces from a pipe, each of sufficient length and surface to give the volume of the test liquid necessary to determine, with the required accuracy, the amount of any migrated constituents. Migration test states that close one end of each test piece, which has been subjected to the prewashing, using a stopper. Fill the test piece with the specified test liquid. Close the other end of each test piece using a stopper and maintain the filled test piece at the specified temperature. For the first migration, at the end of the first test period remove the stopper and empty the test liquid from the test piece into a suitable container. Determine the specified accuracy of the amount of each specified constituent present, C1. For any subsequent migration, n repeat steps 9.4.2 and 9.4.3 to determine Cn where n corresponds to the number of times those steps have been carried out. Using BS EN 852-1 you can understand a method for the determination of the migration of constituents from the internal surface of plastics pipes.