pe water pipe common sense 1.water pipe basic common sense what
Water pipe is the water supply pipeline, modern renovation of the water pipe are used to bury the wall construction, the classification of the water pipe there are three kinds of, the first is a metal pipe, such as plastic lined with hot-plated cast iron pipe, copper, stainless steel pipe. The second category is plastic compound metal pipe, such as plastic compound steel pipe, aluminum-plastic composite pipe. The third category is plastic pipe, such as PB, PP-R.
"Hidden project" is a very important issue, if the water pipe leakage and burst will bring irreparable consequences. In the past, the pipes used for water supply are mainly cast iron pipes. Outdoor mainly with sand mold cast iron pipe, indoor with galvanized cast iron pipe. However, due to the use of a few years after a large number of rust scale easily produced, breeding bacteria, a serious danger to human health. The state has stipulated that in June 1, 2000 onwards, out of sand casting fittings and cold galvanized cast iron pipe, and gradually limit the use of hot-dip cast iron pipe, and promote the use of aluminum-plastic composite pipe, new plastic pipe and so on. The state also provides a variety of pipes and fittings related to drinking water pipelines, must have the approval of the health sector, before sales.
2. What to pay attention to the purchase of PE water supply pipe
Reasonable water facilities are naturally inseparable from the water pipe, and now many buildings in the construction of the PE water supply pipe will be selected, that the user in the purchase of PE water supply pipe to pay attention to what? 1. The choice of manufacturers.
Now there are a lot of people will ask where to buy PE water supply pipe is better, in fact, as far as the market is concerned, there are many suppliers of PE water supply pipe, just need to go to some of the large equipment equipment centers can be purchased, the key is to choose the manufacturer of PE water supply pipe. General consumers in the purchase of the time to choose those larger manufacturers to buy, larger manufacturers in the production technology are more reliable, so consumers trust.
2. To pay attention to the material of PE water pipe. Author: 『Unknown』 Source: 『Unknown』.
3. Installation of ppr and pe water pipe skills
(a) PPR pipe installation 1, process Preparation for installation - prefabricated processing - trunk pipe installation - - riser installation - branch pipe installation - - riser installation - - riser installation - - riser installation - - branch pipe installation -Riser installation - branch pipe installation - pipe test - pipe flushing - pipe cavity sterilization -Pipe cavity disinfection 2, construction preparation Familiarize yourself with the drawings, according to the construction method decided by the construction program to do construction preparation work.
Referring to the relevant professional equipment drawings and decorative architectural drawings, check all kinds of piping and coordinates, elevation, whether the cross, piping arrangement of the space used is reasonable, there are problems should be timely with the design and the relevant personnel to study the solution, to do a good job of change negotiation records 3, prefabrication processing The general principle is to draw the pipeline according to the design drawings of the pipeline branch, pipe diameter, reserved pipe openings, the location of valves, such as the construction of construction sketches, the actual construction of structures, marking the location, according to the marking of subsections Position marking, according to the marking of the actual installation of segment measurement of the size, and then according to the size of the material prefabrication. 4, PPR hot melt connection should be operated in accordance with the following procedures 1) heat fusion device is connected to the power supply to reach the temperature indicator light before starting the operation.
2) Cutting pipe must make the end face perpendicular to the pipe axis, pipe cutting generally use special pipe shears, such as large diameter pipe, then cut with a saw blade, after cutting the section to deburr and burr. (3) Pipe grids and fittings connected to the end face must be clean, dry, oil-free.
4) with calipers and a suitable pen at the end of the pipe to measure and mark the depth of heat fusion, heat fusion depth should be in accordance with the following table: Note: If the ambient temperature is less than 5 ℃, the heating time should be extended by 50%. (5) fusion elbow or tee, according to the design drawings should pay attention to its direction, in the straight line direction of the pipe fittings and pipes, with auxiliary signs to mark its position.
6) Connection, no rotation of the pipe end into the heating casing, inserted to the depth of the sign, while no rotation of the pipe fittings pushed to the heating pipe, to reach the specified sign. Generally available in the heart of the silent reading of the digital method to master the heating time, or to observe the fittings, the degree of heating of the pipe, when the mold appeared on a circle of PPR heat fusion flange, you can remove the pipe, fittings from the mold for the next process.
7) After reaching the heating time, immediately remove the pipe, pipe fittings from the heating jacket and heating head at the same time, quickly and without rotation in a straight line uniformly inserted into the depth of the mark, so that the joints form a uniform flange. 8) In the specified time, just fused joints can also be corrected, but strictly prohibited rotation.
5, support hanger installation 1) pipe installation must be set according to the different pipe diameter and requirements of the pipe card or hanger, the location should be accurate, the pipe card and pipe contact should be tight, do not damage the surface of the pipe. (2) If the use of metal cards or hangers, metal pipe cards and pipes should be used between the plastic tape or rubber and other soft materials spacer.
In practice, often with the same material pipe or PVC-U drainage pipe material for the gasket. 6, valve installation Valves in the installation should be done before the pressure strength test, in accordance with the specification requirements, the test should be 10% of the number of each batch (the same brand, the same specifications, the same type), and not less than 1, such as leakage, cracking failed should be re-sampled by 20%, there are still unqualified, it is necessary to do one by one to test the strength and tightness, strength and tightness test pressure should be the pressure of the valve factory regulations.
(B) PE pipe installation 1, the construction process: pipeline measurement → pipeline clearing table → building construction road → trench excavation → PE pipe transportation → construction of sand bedding → PE pipe heat fusion connection → pipe laying → pipe body backfill → pipe section pressure test → valves, well room installation → pipe trench backfill → set pipeline labeling → water test 2, PE pipe connection method of operation The interface of the connection of the heat fusion docking is a flat surface, and the method is to connect the two identical connection interfaces. The method is to connect the two identical interfaces with a hot plate heated to viscous flow state, remove the hot plate, and then to connect the interface to apply a certain pressure, and in this pressure state cooling and curing, the formation of a solid connection. Its main process for the adjustment, heating, switching, seam pressurization and cooling.
Butt joint interface in the viscous flow state of the material has flow and diffusion, flow is too large for diffusion and entanglement, so to limit the flow to a certain range, in the limited flow to achieve "welding after melting". Therefore, the docking process is the key to the docking process to adjust the temperature, time, pressure, three parameters, to connect the interface material properties, stress conditions, geometry and environmental conditions and other factors together, in order to achieve reliable welding.
3, valve installation Gate valve, butterfly valve should be checked before the installation of packing, its gland, bolts need to have enough margin for mediation, operating machinery and rotating devices should be adjusted as necessary, so that the action of flexible, accurate instructions, and according to the design requirements of the check without error, clean up, do not store debris. Gate valve installation should be kept horizontal, large caliber sealing gasket, need to be spliced using the labyrinth form shall not be used oblique mouth lap or flat mouth butt.
4, flange (1) flange sealing surface and sealing gaskets, should be checked for appearance, there shall be no defects affecting the sealing performance; (2) flange end face should be kept flat, the gap between the two flanges should not be more than 2mm, shall not be eliminated by the method of elimination of strong tightening of the bolt skew; (3) flange connection to maintain the coaxial, the center of the bolt holes does not exceed the aperture deviation of 5% and to ensure free access to the bolt; (4) bolt connection to maintain coaxial, bolt hole center deviation does not exceed the aperture and to ensure that the bolt (4) Bolts should use the same specifications, the same direction of installation, bolts should be symmetrically tightened, tightened bolts should be exposed outside the nut 2-3 buckles; (5) It is strictly prohibited to tighten the flange bolts, and then weld the flange welding mouth method. PP-R (polypropylene random) pipe is also known as the three polypropylene pipe and also known as random **** polypropylene pipe or PPR pipe, with energy-saving materials, environmental protection, lightweight and high strength, corrosion resistance, smooth inner wall does not scale, easy construction and maintenance, long service life, etc., are widely used in building water supply and drainage, urban and rural water supply and drainage, city gas, electric power and fiber-optic cable sheathing, industry, fluid transportation, agricultural irrigation, etc., and the advantages. fluid transportation, agricultural irrigation and other construction, municipal, industrial and agricultural fields.
PP-R pipe is made of random **** polypropylene extruded into pipes and injection molded into fittings. PPR pipe and the traditional cast iron pipe, galvanized steel pipe, cement pipe and other pipelines, compared with energy-saving materials, environmental protection, lightweight and high strength, corrosion resistance, smooth inner wall without scaling, construction and maintenance is simple, long service life, etc., are widely used in construction water supply and drainage, urban and rural water supply and drainage, city gas, electric power and fiber optic cable sheathing, industrial fluid transportation, agricultural irrigation and other construction, municipal, industrial and agricultural fields.
PE is polyethylene plastic, the most basic kind of plastic, plastic bags, plastic wrap, etc. are PE, HDPE is a high crystallinity, non-polar thermoplastic resin. HDPE is a highly crystalline, non-polar thermoplastic resin. The appearance of the original state of HDPE is milky white, in the micro-thin cross-section of a certain degree of translucency.
PE has excellent resistance to most life.
4. What details need to be paid attention to when carrying out PE water supply pipe installation
Here's a look at it! 1. Installation should be standardized.
In the installation of PE water supply pipe, generally do not advocate the use of machine installation, the best use of human hands to install. Manpower to install the pipeline can be very good to deal with the pipeline many small details of the problem, in the installation of the time by the artificial lifting the ends of the pipeline, and then let the bottom of the groove of the construction workers to install.
2. The treatment of water pipe bends. In the PE water pipe installation, the treatment of the bend is also a very important part, to pay attention to the water flow in the bend part of the situation, and to ensure that the water at each interface can be naturally smooth, there will be no congestion and leakage.
3. Checks should be in place. Author: 『Unknown』 Source: 『Unknown』.
5. pe pipe welding precautions what
China's plastic pipe to carry out very quickly, the quality is constantly improving. Among them, polyethylene pe pipe because of its own *** with the same strengths are widely used in the construction of water supply, construction of drainage, buried drainage pipe, construction of heating, gas transmission, electrician and telecommunications protection casing, industrial pipe, agricultural pipe, etc.. It is mainly used in urban water supply, city gas supply and farmland irrigation, etc. PE (polyethylene) material is widely used in the manufacture of water supply pipe because of its high strength, corrosion resistance, non-toxicity and other characteristics. Because it will not rust, so it is the ideal pipe instead of the general iron water supply pipe.PE water supply pipe to fulfill the national standard of goods: GB/T 13663-2000 "polyethylene (PE) pipe for water supply"
PE water supply pipe is a special polyethylene as the raw material by the plastic extruder extrusion molding, applied to the township water supply network, irrigation diversion projects and agricultural sprinkler irrigation projects, especially for acid and alkali resistant, corrosion-resistant and durable. Applicable to acid and alkali resistance, corrosion-resistant environment of the plastic pipe. Because the PE pipe selection of hot melt, electro-thermal fusion connection, complete the interface and the integration of the pipe, and can be useful to resist the pressure generated by the circumferential stress and axial impact stress, and PE pipe does not add heavy metal salt stabilizers, raw materials, non-toxic, non-scaling, non-breeding of bacteria, to avoid the secondary pollution of drinking water. PE to the water pipe can be divided into the following steps of welding, which are essential. We must pay attention.
(1) PE water supply pipe welding, the axis of the two tubes will be centered, the first two tube ends spot welding fixed.
(2) PE water supply pipe and flange welding, should be the first to stab the water supply pipe into the flange, spot welding with an angle ruler to find the right, leveling and then welding. Flange should be double-sided welding, its inner welding shall not be outstanding flange closed surface.
(3) PE water pipe wall thickness of more than 5mm, should cut the bevel, to ensure that the full weld penetration. Beveling can be used to cut gas welding or beveling machine processing, but should be eradicated slag and iron oxide, and polished with a file until the metal light is revealed.
(4) steel pipe cutting, its cutting surface should be straight with the center line of the pipe to ensure the concentricity of the end of the pipe welding.
(5) The flange should be straight in the center line of the pipe, the appearance should be parallel to each other, the flange liner shall not be convex into the pipe, the standard of the bolts connecting the flange should be matched with the flange, the length of the screw protruding from the nut shall not be greater than the 1/2 of the diameter of the screw.
(6) Welding of water supply pipe, the pipe interface should be shoveled out of the floating rust, dirt and grease.
(7) flange liner in accordance with the drawings and standard requirements for selection, cold water system selection of rubber gasket, hot water system selection of asbestos rubber gasket.
6. pe water pipe features what
Corrosion resistance Polyethylene is not inert material, in addition to a small number of strong oxidizing agents, can be resistant to a variety of chemicals erosion, and not easy to breed bacteria.
As we all know, steel pipe, cast iron pipe is replaced by plastic pipe not only because of plastic pipe than its low energy consumption, low energy consumption, light weight, low resistance to water flow, easy and rapid installation, low cost, long life, with thermal insulation, etc., but also because of the corrosion resistance of the plastic pipe, not easy to breed microorganisms and other properties superior to the steel pipe and cast iron pipe. The service life of polyethylene pipe is more than 50 years, which has not only been confirmed by international standards and some advanced foreign standards, and has been proven in practice.
Flexibility Polyethylene has a unique flexibility and excellent scratch resistance, polyethylene piping system flexibility has a huge technical and economic value. The flexibility of polyethylene is an important property which greatly increases the value of the material for pipeline engineering.
Good flexibility allows polyethylene pipes to be coiled and supplied in longer lengths, avoiding a large number of joints and fittings. For example, in the national urban water reform demonstration unit Nantong Water Supply Company in a household in the transformation of a meter to make full use of the selection of materials PE small-diameter pipe can be coiled characteristics, from the water meter to the user in the end of a pipe, the middle of the pipe joints are not required, both to save costs, but also to improve the efficiency of the work.
Low-temperature Polyethylene has outstanding low-temperature resistance, PE pipe low-temperature embrittlement point of -70 ℃, better than other pipes. In the winter field construction of polyvinyl chloride (PVC-U) pipe is prone to brittle cracks, China's Beijing region to lay polyvinyl chloride (PVC-U) buried water supply pipe pilot project summed up a lesson learned is that the temperature below zero degrees is not suitable for polyvinyl chloride (PVC-U) pipe laying construction.
There is also a clear corroboration, in order to improve the toughness of PP and low-temperature impact resistance, can be ethylene and propylene monomer *** polymer made of random *** polypropylene (PP-R), which is generally used in the iPP process routes and methods, so that a mixture of propylene and ethylene *** polymerization, to get the main chain of propylene and ethylene segments of the irregular distribution of the *** polymer (i.e., PP-R), PP-R pipe materials, PP-R pipe materials. R pipe material), PP-R pipe material in most of the ethylene content of about 3%. However, the improved PP-R low-temperature resistance is still unsatisfactory, its embrittlement point of about -15 ℃, much higher than the embrittlement point temperature of polyethylene pipe -70 ℃.
Fracture toughness Polyethylene has a good fast crack growth fracture toughness, rapid crack growth occurs when the damage occurs, the cracks can be 100~45m/s speed rapid expansion of hundreds of meters to a dozen kilometers, resulting in damage to long-distance pipelines, large-scale leakage accidents, as well as subsequent combustion and explosion (natural gas transmission) or flooding (water transmission) accidents. The probability of such accidents is small, but once it happens, the harm is great.
For the continued development of plastic pressure pipe, the importance of preventing the occurrence of rapid crack growth damage requirements have exceeded the requirements of long-term life strength performance. Comprehensive above can be seen pe water pipe in our lives is very important, we usually use drinking water are transported through the pe water pipe.
PE water pipe has good high temperature resistance, strong impact resistance, good corrosion resistance, environmental performance is also very strong. The chemical properties are also very good.
PE water pipe is made of special materials, special technology. In addition to this, the service life of PE water pipe is also very long.
The most important thing is that PE water pipes are non-toxic, harmless and very economical, so they are very safe and smooth when it comes to transportation of water.
7. pe water pipe ppr water pipe what is the difference
PE water supply pipe and PPR water supply pipe the difference between this, I hope the above can help you.
1. Welding:
PPR water piping and PE water pipe are using heat fusion welding pipe, but PPR water pipe is easier to operate, PPR water pipe flanging rounded, for PE water pipe PE water pipe flanging irregular, easy to clog, at the same time, between the two of them the welding temperature is different, PPR water pipe is 260 ℃, PE water pipe is 230 ℃. PE water pipe is 230 ℃.
2. Size specifications:
PE pipe can do the size of the larger specifications for the dn1000, PPR larger specifications for the dn160, so the PE pipe is used to do more drainage, water supply pipe is generally PPR.
3. Low-temperature impact strength
From the indicators, PE water pipe material is strong, but PPR water pipe is stronger than PE water pipe. Will be a little higher than the strength of PE water pipe, PE water pipe is more flexible than PPR water pipe.
4. Temperature performance
PE water pipe in normal use, the higher stable temperature of 70 degrees Celsius, the lower temperature of minus 30 degrees Celsius, PPR water pipe in normal use, the higher stable temperature of 70 degrees Celsius, the lower temperature of minus 10 degrees Celsius, PE water pipe and PPR water pipe between the two are the same performance of high temperature resistance. Characteristics, but in the low temperature performance, PE water pipe will be better than PPR water pipe.