Features selection of PEX
Here you can read some of the provisions of the standards for assessing the quality of different types of PEX pipes for heating.
First, it is important what kind of plastic in order to determine make PEX. Every manufacturer shall specify the type of material used. Hose for heating, hot water and drinking water, which appear on the market, mostly made of raw materials.
PTFE Tubing
Secondly, it is necessary to produce the kind of pipeline materials to understand. L 'Manufacturers of PEX tubing should be about the nature of commodity products. Examples of trade marks can serve as BASF Lupolen 5261 ZQ 100 for PEX production method of Engel (trumpet Wirsbo-Pex), Hoechst Hostalen PPH 2222 for Pex pipe, Pex pipe for Shell PB 4121.
Thirdly, it is important to know is not exactly what a chimney or a properly marked. Marking should not be deleted, and where information such as PEX tubing manufacturer or stamps bearingtube size (wall thickness, diameter), the maximum operating temperature, the pressure in the permissible operating temperature allows the stamp of approval of the competent supervisory authority, the engine room (as if the manufacturer uses multiple computers) and the year of manufacture.
The fourth important point is whether to secure the contract between the producers of the authority, quality products and the regulator. Each manufacturer must demonstrate that thecontrolled product is produced by a test Institute for the maintenance of quality standards.
The fifth question, whether it be a formal recognition for the proposed use. Seller must provide proof of registration. This is especially true for the Pex tubing for use in hot water systems and determined.
Sixthly, an important factor for the health of the question whether the tube has a negative effect on health when used in power systems and hot water. In this caseThe producers must have a certificate that the products are not harmful to health (toxicological and health certification).
Seventh, the tube should be established with the standards and quality standards for the specific purpose of use. These standards represent only minimum requirements. Normally meet the requirements of testing a much wider spectrum.
Then the manufacturer must prove the official conduct a hydrostatic test of time before the destruction of PexTubes. In addition, long-term test can not be done for the tubes. The proof is on the tube to be withdrawn from the manufacturer's production.
Also an important factor in the choice of PEX – PEX as durable. That life is documented. It 'also required to provide evidence that the studies were considered as the wear resistance and smooth tubes together.
Make sure you ask the question if the areas of test and assembly? And 'necessary for the required testResults.
Understand the question of whether the installation instructions. this manual and the installation of the manufacturer must include the following: the extent permitted evaluation of temperature and pressure, flexibility, behavior, destructive cold, resistance to UV rays, melting point, elasticity, when heated, the system pipe joints and the coefficient of expansion.
may be more understanding of the pipe material datauseful. The first is the mechanical properties: density, tensile strength, modulus, elongation, impact resistance, water absorption, coefficient of friction, surface tension and oxygen permeability. limit the temperature, thermal expansion, melting point, specific heat, thermal conductivity: Additional thermal properties.
Features selection of PEX
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PTFE Tubing | | 31 May 2011 |
