Here you can read some of the rules of rules for assessing the quality of different grades of Pex Tubing for heating.
First, it is important to determine what type of plastic used to make Pex Tubing. Any manufacturer should specify the type of material used. Flexible pipe for heating, drinking water and hot water, which appear on the market, mostly made from raw materials.
Secondly, it is necessary to understand what brand of raw materials used to produce pipeline. The manufacturer of Pex Tubing should seek information about the sort of commodity raw materials. Examples of trade marks can serve as BASF Lupolen 5261 ZQ 100 for PEX pipes produced by the method of Engel (trumpet Wirsbo-PEX), Hoechst Hostalen PPH 2222 for Pex Tubing, Shell PB 4121 for Pex Tubing.
Thirdly, it is important to know exactly what a chimney properly marked or not. Marking should not be erased and should contain different information, such as manufacturer name or mark Pex Tubings, pipe size (wall thickness, outside diameter), the maximum operating temperature, pressure allowed in the permissible operating temperature, the stamp approval of the relevant supervisory authority, the machine room (in the if the manufacturer uses several machines) and year of production.
The fourth important point is, is whether the contract between the producer, the public agency to ensure quality products and the supervising authority. Each manufacturer must provide proof that the product produced is controlled by a test Institute for the maintenance of quality standards.
The fifth issue to be addressed whether there is an official permission for the proposed use. Manufacturer must provide proof of authorization. This is especially true of Pex Tubing intended for use in supply systems and hot water.
Sixthly, an important health factor is the question, whether the pipe has a negative effect on health if it is used in supply systems and hot water. In this case, manufacturers must have a certificate that the products are not hazardous to health (hygienic and toxicological certification).
Seventh, the pipe must meet the standards and quality standards established for the specific purpose of use. These standards represent only minimum requirements. Typically, the requirements of testing bodies cover a much larger spectrum.
Then the manufacturer must provide proof of official conduct a hydrostatic test of time before the destruction of the Pex Tubing. Moreover, long-term test can not be made on the sample tubing. The test must be conducted on the tubing, taken from the production line manufacturer.
Also an important point when selecting the Pex Tubing - how durable Pex Pipe. Such a life should be documented. It is also required to provide evidence that the study of wear behavior and trouble-free tubes were held together.
Sure to ask the question of whether test and assembly areas? It is necessary to request the test results.
Understand the question of the existence of instructions for installation. Manual and installation instructions provided by the manufacturer must contain the following information: the permissible limits of temperature and pressure rating, flexibility, behavior, destructive cold, resistance to ultraviolet radiation, fusibility, elasticity when heated, the system of pipe connections and the coefficient of elongation.
Further knowledge about the data pipe material can be useful. The first is the mechanical characteristics: density, tensile strength, modulus, elongation at break, impact resistance, water absorption, coefficient of friction, surface tension and oxygen permeability. Further thermal characteristics: the temperature limit, the coefficient of thermal linear expansion, melting point, specific heat, thermal conductivity.
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