Identification of PPR pipe fitting or most of the owners will be renovated for use during home improvement PP-R (polypropylene random copolymer) water supply can be described as ignorant, or hearsay many incorrect distinguish good and bad ways, such as The more popular a saying - "with a hammer to hit, do not hit the crack is good, hit the crack is of poor quality," this method on a surface which is very simple and very practical, but in fact, careful analysis misleading. Safety Precautions: PP-R that random copolymer polypropylene, is the new pipe material commonly used in today's developed countries, it uses homogeneous welding technology in hot and cold water transport project, its comprehensive technical performance and economic indicators are far superior Other similar products, especially its excellent health properties, the use of waste from production to the whole process of recovery can achieve very high health and environmental protection requirements. Products with heat, pressure, thermal insulation, long life and economic advantages, will gradually replace the existing pipes and other classes become the dominant product. PP-R pipe by three polypropylene raw materials extruder, of a pure plastic pipe products, its transportation and installation at low temperature environment, vulnerable to the impact of cold brittleness appears pipe cracking, breakage, and therefore Press "building water supply polypropylene pipeline technical regulations," the national standard GB / T50349-2005, combined with practical experience in the installation, in particular, require the following precautions, you can avoid the transport, pipes and fittings cracking phenomenon caused by improper installation. First, the storage 1, pipe flat stacking height of less than 1.5m; 2, can not open storage, to prevent direct sunlight, away from heat; 3, good handling package, handle with care, avoid oil, non-cracking hit drama, litter hit strike stampede rolling, and sharp objects to touch and throw, throw, roll, drag, causing hidden crack pipe. Second, install a check whether the crack pipe, pollution, etc., cut off both ends of 50mm; 2, using the temperature 260 ± 10 ℃ and no wear welder welding head, according to the heating in place, plug quickly, smooth vertical and horizontal avoid rotating welding points; 3, when taking over the wire connected to the water meter parts, valves, faucets, etc., do not overexert overtighten lead to cracking and silk pieces of pipe rupture; 4, fittings at the inlet and the water heater is not directly connected to the transition must be greater than 300mm hose connections; 5, when hot and cold water pipes parallel pipe without the installation of insulation materials, spacing greater than 100mm, avoid cracking toughness; 6, outdoor surface mounted tube with aluminum foil, PVC jacket pipe and other materials protected from direct sunlight; 7, at temperatures below 0 ℃ environment, to add insulation antifreeze, crack, insulation thickness is sufficient; 8, embedded in the wall of the pipe laying, surface mortar thickness greater than 20mm, to avoid pipeline stretching to make walls, floors cracking; 9, waterproof treatment is prohibited in the asphalt, paint and other volatiles coated pipe surface, resulting in water quality odor; 10, is connected to other plastic pipe materials can not be directly welded wire pieces can be used connections, such as PP-R connected with PE, PE-RT, PB, etc; 11, plan or scribe mark Concealed pipeline location, to avoid the decoration flooring, tiles and other broken pipe set; 12, to prevent excessive solder and debris off site thereby clogging pipes into the pipeline; using plugs and other timely closure port; 13, should not be designed and installed in the structural layer of the building, such as floor beams, leading to not repair; three, a pressure test, pipeline installation, fully After cooling, the pressure test must be done to eliminate leakage due to pipeline transportation, improper installation; 2, cold water pipe test pressure shall be 1.5 times the design pressure of not less than 0.6MPa; hot water pipes should be 2.0 times, not less than 1.0MPa; 3, the piping system is installed, the pressure test should begin during the cooling intensity reached. Regulators generally one hour and no leakage is qualified; 4, using test pump test pressure gradually rose, to avoid too fast to generate momentum, pressure gauge reading wrong or failure, the test pressure exceeds the pressure on the pipeline and expansion crack; 5, the construction side with the owners signature "acceptance of a single pressure test" to determine the contents of the pressure test to ensure the safe use of the pipeline system; 6, the family of the plastic plug at the outlet of the pressure test and the case is closed by a temporary, long-term do not install faucet, hose, angle and other sanitary products, may cause leakage.