Clamping flanges are ordinary flat fastening rings (HDPE flanges) manufactured in accordance with GOST 12820-80, the inner diameter of which is bored to the required size. The mounting holes are evenly spaced around the circumference of the flange. The main application of clamping flanges is found in polyethylene (PE) pipelines, where they are used to connect HDPE pipes to each other, as well as to connect polymer pipes to metal pipes, connect to industrial equipment pipes, valves, etc.
Initially, all clamping flanges are made according to the same standard, but then they are bored, acquiring a different inner diameter. The size of the required diameter is determined depending on the size of the polyethylene sleeve that will be used with this flange. The bored flange is pushed onto a sleeve, the end of which is welded to the end of the pipe. Installation carried out in this way allows a particularly high strength of the joints to be achieved. In this case, the flange is ideally connected to a pipe of any size, and all its other parameters - the number of holes and their diameter, the center-to-center distance - fully correspond to flat welded flanges made in accordance with GOST 12820-80. Clamp boring flanges for HDPE pipes are of several types - for pipes with a maximum working pressure of 6, 10, 16 and 25 atmospheres. The clamping flanges presented in our catalog are made of high-quality steel grade CT20 (steel 20) with an anti-corrosion coating applied to it, which ensures the durability of the products and resistance to the external environment.
All flanges from the price list IN STOCK on our !
vendor code | Pipe diameter, mm | DN mm | D mm | D0 mm | b mm | n pcs. | d mm | Weight, kg | Price per unit rub., Incl. VAT | |
---|---|---|---|---|---|---|---|---|---|---|
FPND10050 | 50 | 40 | 145 | 62 | 12 | 4 | 18 | 1,175 | 277 | To order |
FPND10063 | 63 | 50 | 160 | 78 | 12 | 4 | 18 | 1,348 | 318 | To order |
FPND10090 | 90 | 80 | 195 | 108 | 14 | 4 | 18 | 2,163 | 510 | To order |
FPND10110 | 110 | 100 | 215 | 128 | 15 | 8 | 18 | 2,52 | 594 | To order |
FPND10160 | 160 | 150 | 280 | 178 | 17 | 8 | 22 | 4,49 | 1 059 | To order |
FPND10200 | 200 | 200 | 335 | 225 | 17 | 8 | 22 | 6,05 | 1 642 | To order |
FPND10225 | 225 | 200 | 335 | 238 | 17 | 8 | 22 | 5,42 | To order | |
FPND10250 | 250 | 250 | 390 | 273 | 18 | 12 | 22 | 7,96 | 2 067 | To order |
FPND10280 | 280 | 250 | 390 | 294 | 18 | 12 | 22 | 6,64 | 1 881 | To order |
FPND10315 | 315 | 300 | 440 | 338 | 19 | 12 | 22 | 8,616 | To order | |
FPND10355 | 355 | 350 | 500 | 376 | 19 | 16 | 22 | 11,817 | To order | |
FPND10400 | 400 | 400 | 565 | 430 | 21 | 16 | 26 | 15,991 | To order | |
FPND10560 | 560 | 600 | 780 | 613 | 22 | 20 | 30 | 29,112 | 6 870 | To order |
FPND10630 | 630 | 600 | 780 | 643 | 22 | 20 | 30 | 24,001 | 6 796 | To order |
A flange adapter is a special device for creating a tight connection in pipelines. The part serves as an adapter for a strong joint of pipeline parts or a flange for connecting shut-off and control valves and other parts of the system. Flange adapter for polyethylene pipes differs from other varieties in restrictions on temperature indicators and pressure indicators in the system, and also cannot be used in lines with an aggressive working environment.
The design is a device consisting of a coupling and a flange. It is necessary to use bolts to connect the adapter to the pipeline flange, and the coupling to the plain end of the pipe.
When the bolts are tightened, the pressure rings move towards each other, the seal deforms, pressing tightly against the outer surface of the pipe, thereby creating a strong joint between the parts of the pipeline.
The adapter acts as a compensator for compression and extension of the axle and smooths out minor deviations from initial project during installation works and operation.
The part allows you to install pipes made of polyethylene and polyvinyl chloride in a metal line. The device is vibration-resistant, elevated temperatures and pressure surges.
Thanks to the gasket, the part can be used, among other things, in systems with an aggressive working environment.
No special tools are required to complete the connection, except a wrench, and no special skills and abilities, which saves both time and money.
Note! The only drawback is that over time, the gasket that provides a snug fit breaks down due to too strong a grip.
The flange adapter is used in the shipbuilding, automotive, construction and residential, oil and gas industries.
There are several types of flange adapters:
Note! The device for polyethylene pipes is used only in systems operating at standard pressures and a maximum temperature of 700 C only for transporting water and other neutral liquids.
The adapter for PE pipes is epoxy coated, which is applied electrostatically.
When arranging modern systems sewerage, heating, water supply, polyethylene pipes are often connected with fittings. Also, when laying household communications, flanges are used, which make it possible to collect pipe products from different materials.
In recent years, polyethylene (PE) pipes have been actively replacing traditional iron and steel products from the construction market. Plastic structures are superior to metal ones in a number of ways. Therefore, such a process has a completely logical explanation - everyone wants to have in their home reliable and inexpensive in operation, heating, sewerage, assembled without welding. When installing, you have to face one problem. It lies in the fact that many elements of household piping in apartments are made of metal products.
Connecting plastic and metal pipes
And here it is important to correctly perform the connection of PE pipes with steel (cast iron) pipes. This can be done in two ways: using flanges and using fittings. Flange connection of polyethylene (polypropylene) pipes with steel pipes is recommended for cases when systems of products with a cross section of more than 50 mm are equipped. But pipelines with a diameter of up to 50 mm are best connected with fittings. They are special elements with a smooth socket for connecting PE pipes and a thread for metal pipes.
The flange is manufactured as a threaded part. It is most often used to connect metal and polyethylene water pipes, as well as gas pipelines without welding. Flanges for assembling household networks from different materials have not only a thread on one side, but also an obligatory seal. The latter is located at the second end of the described element. The seal guarantees a tight and truly durable connection that can always be disassembled if necessary.
Flange connection example
For laying communications, you can use:
Experts advise home craftsmen to connect PE pipes using the second of these methods. In this case, the connection is of the highest quality. Flanges for bushings are made of steel 20. Flanges for polyethylene pipes are designed for operating pressures up to 1.6 MPa. These parts are manufactured with a cross section from 20 to 1200 mm. Therefore, problems with the selection of suitable elements for creating detachable connections never arise. There are several subtleties of assembling communications using flanges. We give them below:
When choosing flanges for making detachable connections, pay special attention to the quality of the fasteners. Burrs and sharp edges are not allowed on them. Such defects can cause damage to PE pipes. Flange connection of polyethylene pipes with a cross section of more than 50 mm is made according to a simple scheme. You need to evenly cut the pipe product in the place where it will dock with another part of the communication. After that, you gently pull the flange over the pipe and put on a rubber gasket on top.
Such a sealing element can go beyond the cut made by a maximum of 1 cm, no more. Then you slide the flange over the gasket and dock it (using bolts) with the mating flange. The bolts must be tightened very carefully. If you apply excessive force during this procedure, the plastic pipe may crack.
Individual elements of communications (heating, water supply) in an apartment or house are often connected with fittings. These elements are indispensable for connecting polyethylene pipe products to metal filters, meters, mixers, pipes and other details of a modern pipeline. An external or internal thread is cut on the fittings. Structurally, as noted above, they are special adapters with a thread and a coupling.
Pipe fittings
When choosing fittings, it is necessary to take into account the diameter of the metal pipe into which they will be cut.
Adapters are ideal for applications where piping has a lot of bends and bends. The assembly of the system (steel or cast iron pipes plus polyethylene) using fittings is performed as follows:
Basically, that's it. You have connected a polyethylene (or polypropylene) pipe to a steel one. Turn on the water (if a water supply system was made) and check the fitting attachment point for leaks. If there is one, simply twist the adapter a little. The final of the work is the treatment of the joint made with a sealant. You can fully use the pipeline in 3-4 hours. During this time, the sealant will dry completely.
When installing water and gas pipelines, there is a constant need to connect pipes made of different materials. To connect pipes made of polyethylene (HDPE, PE) with steel pipes, use: special adapters polyethylene-steel (NSPS), threaded compression couplings or a sleeve for a flange connection.
Permanent connection polyethylene-steel (NSPS) or adapter PE-steel it is used in the construction of gas pipelines, water pipelines, pressure sewerage to perform the transition from a steel pipe to a HDPE polyethylene pipe or vice versa. Used when installing pipeline fittings or tapping into an existing steel pipeline. The steel-PE transition does not require maintenance; it can be placed directly in the ground without wells on straight sections of the pipeline.
The polyethylene-steel transition is a connection obtained by welding a steel pipe with a polyethylene pipe. The length of the branch pipes is regulated technical conditions for gas pipelines TU 4859-026-03321549-98, for pressure pipelines according to TU 2248-001-86324344-2009. Maximum working pressure for gas pipelines made of PE80 0.64 MPa, PE100 1.0 MPa. The maximum working pressure for pressure water pipelines is PE80 1.25 MPa, from PE100 1.6 MPa.
In the manufacture of an integral polyethylene-steel connection, a HDPE polyethylene pipe is used GOST R 50838-95 for gas pipelines and GOST 18599-2001 for water pipelines. And a steel water and gas pipe in accordance with GOST 10705-80, GOST 10704-91, GOST 8731-74, GOST 8732-78. NSPS is a connection that is made by welding a steel pipe with a polyethylene pipe. The length of the product is regulated by the TU for pressure pipelines and gas pipelines. Pressure for gas pipelines PE 80 - 0.64 MPa, PE 100 - 1 MPa; for pressure pipelines PE 80 - 1.25 MPa, PE 100 - 1.6 MPa.
Most often NSPS use for connecting metal locking devices to a polyethylene pipeline, gradual replacement of steel pipeline sections with polyethylene, tie-in polyethylene branch. The principle of the NSPS part is a strong and tight connection of a pipe or steel part with a polyethylene pipe of the same diameter.
The permanent connection to the end of the pipe takes place by means of thermistor welding, which requires special equipment. The end of the polyethylene pipe is heated to a viscous-viscous state and under pressure is connected to the steel end. To strengthen the connection, polyethylene couplings are used, but you can do without them. It allows this connection to be used in high-pressure pipelines.
NSPS allow:
Compression polyethylene HDPE fittings. This type of fitting is called tube fittings. They are attached to the system using gasket material and crimp rings. To use this type, you do not need any optional equipment... In addition, when the cushioning material is used up, you can replace the old gasket with a new one. That is, HDPE fittings of this type can be used repeatedly, especially in hydraulic systems Oh.
Compression products are mainly used for hydraulic water supply systems. They can be built into such a system without even being fully assembled. This makes it possible to widely vary their application in water supply systems. Compression fittings are of the following types:
They are available with both internal and external threads. Like other fittings, these come in various shapes. They are: coupling, triple, cross, plugs, flanges, bends.
They are made in different diameters: from 16 to 110 mm. The working pressure, depending on the diameter, can vary from 10 to 16 atmospheres.
All structural components are modular and disassembled. This has a good advantage, since in the future such pipes will be easy to replace, and the connection will be reused.
Application of HDPE polyethylene fittings
Most often, these fittings are used to connect pipes in those places where it is expected to change the direction of the pipeline, as well as the presence of branches or transitions to pipes of a different material. They are used both for technical and for drinking water supply, in irrigation systems or as cable ducts. Thanks to the material, these fittings allow you to make a complete tightness of the pipe joint.
Application compression fittings for connecting pipes
Also, their ease of installation allows you to install parts of small diameters without outside help and special equipment. These parts are stored in dark rooms, away from direct sunlight.
This part consists of 5 dismountable parts. To fix the crimp, there is a cover nut, which has external grooves for easy screwing and an internal thread. It is made of polyethylene copolymer.
The crimp ring is a part that prevents any movement of the pipe, including spontaneous unscrewing.
Compression fittings structure
The sleeve fixes the gasket in a stable position, limits its compression and deformation of the pipe. Made from polypropylene copolymer.
The gasket is made of rubber. Provides good tightness, even in the event of a kink in the pipe.
The body itself is made of polypropylene copolymer, has a special pipe stop and trapezoidal thread.
Polyethylene sleeveunder the flange is used to connect PE pipe to a steel pipe through a flange connection, as well as fasteners to control or shut-off valves.
Among the bushings made of HDPE, 2 groups are distinguished:
HDPE segment bushings - Such sleeves are butt-welded HDPE elements, partially or completely consisting of HDPE pipes.
Molded HDPE Fittings - differ from segment ones in that they are made by injection molding and do not have welds. Large-diameter fittings are sometimes produced by casting followed by machining.
The principle of using this fitting is to provide an abutment for the flange that is put on the sleeve and excludes the possibility of disconnection of the assembly during its operation. A sleeve for a flange is used at the transition points of a polyethylene pipeline on a valve or a steel pipe, if there is a counter flange on it.
The HDPE flange sleeve is used in conjunction with a clamping flange, which must have a wider inner diameter than a conventional standard flange. The need for boring the inner part of the flange consists in the presence of a reinforcing expansion of the polyethylene part of the sleeve at the base of the collar, which prevents the flange from tightly fitting to the clamping part.
After installing the sleeve on the pipe, using a steel flange and bolts with nuts, the pipe is attached to the valve, and the collar on the sleeve prevents the flange from jumping off when the pipeline is operated at operating and maximum pressures.
Using HDPE bushings
The installation of the bushings is quite simple, because all modern elements connecting fittings strive for ease of use. This saves time and money at the time of construction of the pipeline, and also allows you to achieve long-term system operation without problems. The benefits of mounting different types of system elements using bushings are as follows:
When organizing piping for a liquid or vaporous working medium, you can rely on the quality and reliability of molded plastic flange sleeves at the connection points. These elements will help to organize a reliable and durable pipeline system.
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Flange connection of polyethylene pipes
1. Polyethylene pipe;
2. Sleeve for flange;
3. Loose flange;
The choice of shut-off, control and other valves installed on polyethylene pipelines is carried out in accordance with the standards, specifications, catalogs, parameters of the transported substances, taking into account the project requirements and operating conditions.
Pressure polyethylene pipelines are connected to pipelines made of other materials using detachable steel flange connections.
The sleeve for the flange at the base of the shoulder has a special constructive expansion designed for more reliable connection of the shoulder. After all, it is on the collar of the sleeve that the main pressure occurs during the operation of the pipeline. Conventional flanges supplied for steel pipes in accordance with GOST 12820.80 cannot be freely installed on the sleeve due to their narrow inner diameter. Therefore, for the flange connection of polyethylene pipes, free bored flanges are used according to GOST 12822.80 with an increased inner diameter d1, which allows it to be freely put on the PE pipe.
Free flange
d - inner diameter of the flange according to GOST 12820.80;
d1 - free bored flange according to GOST 12822.80.
Thus, to connect dissimilar pipes, use:
Joining pipes made of dissimilar materials by means of flanges is optimal when installing a line in which it is required to connect a metal pipe with HDPE or locking devices. For this purpose, a sleeve is used together with a clamping flange, which in turn is fixed with bolts. The collar (the second name of the part) prevents the flange from sliding off when the pressure in the pipe rises.
There are two types of bushings:
The part is easy to assemble and does not require any special maintenance. A variety of standard sizes allows you to select bushings of any size for any pipe diameter.
Flanges are also divided into two types:
Note! When installing, it is important to pay attention to the smoothness of the steel parts: any burrs or protrusions can damage the polyethylene.
The design is most often used when replacing phased sections metal system for polyethylene, as well as for mounting valves.
For installation, thermistor welding is used, when the end of a polyethylene pipe with a special tool is heated and melted to a viscous mass, and then under pressure is connected to a steel pipe. This connection is used for the installation of high-pressure pipelines.
Normative documents regulate the technical characteristics of the NPSP:
System pressure limits:
The length of the branch pipes is regulated by GOST TU4859-02603321549-98 - for gas, and TU2248-001-86324344-2009 - for plumbing systems working under pressure.
It is a collapsible modular design, the parts of which are easy to replace.
The body is made of polypropylene, equipped with a pipe stop and a trapezoidal thread. The fixing sleeve with a sealing gasket, which ensures tightness, prevents the pipe from deforming and shrinking. The ferrule secures the pipe securely in a stationary position.
They are mainly used for plumbing systems.
Couplings come in different shapes:
They can have both internal and external threads.
The part diameter ranges from 16 to 110 and the working pressure ranges from 10 to 16.
During a major or maintenance the question often arises - how to connect a plastic pipe with a metal one, which is associated with the need to replace worn-out sections of communications of various lengths. A similar problem may appear during the construction of a private household - when connected to centralized engineering systems. Correct docking pipes made of various materials, is not inferior in reliability to the connections of identical pipes, therefore it is important to find out in advance how to connect dissimilar sections.
Partly cases where connection is necessary plastic pipes with metal ones, described above. In most cases, the installed metal turns out to be certain time back system. Nowadays, plastic is chosen not only because of the reasonable price and good technical characteristics but also because of large selection standard sizes of pipes and fittings, making it easy to find components of any configuration for replacement.
An example of connecting a plastic pipe to an iron pipe
Sometimes pipes made of different materials (metal and plastic) are used when installing a system from scratch. For example, when laying an outdoor section of water supply or sewerage in a private house, sometimes it is necessary to lay pipelines under a car entrance or parking lot. The dynamic load on the ground surface during the movement of vehicles will be transmitted to the communications located in the ground. It is recommended to install metal pipes in these areas, however, the use of metal for the installation of the entire system is economically impractical and less practical.
There are two ways how to connect plastic pipes to metal pipes, which are used for steel pipelines.
In order to understand how to connect a plastic pipe with a metal pipe using a thread, you should study the fittings used for this purpose. They are adapters, on one side of which there is a thread for connecting a metal pipeline and a smooth coupling for soldering plastic pipes on the other. There are also models for connecting more dissimilar lines, as well as fittings for making turns and bends.
Polypropylene threaded fittings for PP to metal conversion
The threaded connection of steel and plastic (polypropylene) pipes is performed in a specific sequence.
A fitting for polyethylene pipes (HDPE) at one end has a thread for connection with metal, and at the other end a compression fixture for a HDPE pipe - unlike polypropylene pipes, welding is not required here
The connection of a plastic pipe with a metal pipe without a thread is performed using flanges. Its advantage is the ease of dismantling for repair or cleaning of communications.
Flanges of various types are used as connecting elements for detachable connections of dissimilar pipelines.
Flange connection for HDPE pipes
As preparatory work Before installing the flange joint, it is important to carefully inspect the prepared flanges. They must be free of burrs, which during installation may damage the plastic part of the connection. In most cases, these burrs are easy enough to remove.
The assembly procedure for a flanged assembly is as follows:
Mounting a plastic pipe to a metal pipe using flanges
Tightening should be done by evenly screwing the thread of the fastener around the entire circumference and avoiding unnecessary efforts.
If you are interested in what is better to make a suburban water supply, we recommend that you read our article "Plastic pipes for water supply in the country". Types and tips for installation.
For the installation of HDPE pipes, the easiest way is to use fittings. We have another article about compression fittings for polyethylene pipes.
If you need to choose a press tongs for the installation of metal-plastic pipes, then here you will find useful information.
When installing sewerage systems, a connection is often required cast iron pipe with plastic, which is structurally different from the joints of steel and plastic pipes. For such connections, special accessories are required:
Transition collar cast iron-plastic
In most cases, it is not difficult to select and purchase components. At the same time, and in those rare cases when it is not possible to find a suitable seal, the problem can be solved with the help of materials at hand. The sealant can be cut to the correct size from foam rubber, such as an old car carpet. A long narrow tape is placed in the gap between the elements to be connected and sealed with a blunt, wide screwdriver. Sealing is done without undue effort so as not to damage the plastic. If a leak is found during a test filling of the system, the connection can be re-sealed.
Sealing the connection by means of embossing or cement mortar are not acceptable.
The connection of plastic pipes with copper is extremely rare, however, special fittings for such connections can also be found on sale. They have two smooth couplings - one for soldering copper piping, the other for connecting to a plastic pipe.
It is easy to assemble a water supply from HDPE pipes
Today pipes made of low pressure polyethylene are in great demand. This is facilitated by the positive qualities of such products. Namely:
But there are also some disadvantages. So, HDPE pipes do not tolerate ultraviolet radiation well. Also, such pipelines are not intended for pumping liquids with high temperatures, as a result of which they can deform.
Butt-welded HDPE pipe
Special equipment is used for butt welding of polyethylene pipes. At the same time, it is very difficult to do such work on your own; for this you need to have special qualifications. Butt welding of HDPE pipes is carried out in two ways:
The first method is used only when installing pipelines with low pressure. These include sewerage systems and sewage disposal systems for industrial enterprises... Electro-hydraulic equipment is capable of creating pipelines for any purpose. Connections made using this method are strong and durable. The pipelines themselves are able to withstand high pressure and any mechanical stress.
Welding the bend
Various HDPE parts can also be used for pipe welding. So, the industry produces bends, crosses, tees, transitions, etc. With their help, you can create a piping system of any configuration.
But, as mentioned above, welding requires the use of special equipment and sufficient experience. For these reasons, this method is rarely used in everyday life. A simpler, but no less reliable way to connect HDPE pipes (and not only to each other) is to use fittings.
HDPE pipes can be connected using special fittings. Such designs are used when creating communications from pipes of small diameter (up to 50 mm). In this case, you can use the following types of fittings:
Electrofusion sleeve connection
The first option is a clutch with an electric heating element inside. When connected (after being connected to electricity), the fitting heats up and melts the polyethylene. The result is durable and reliable connection, but not separable.
To carry out work, you must first clean the pipe and fitting from dirt. Then they are exposed along one axis, while achieving the immobility of the entire structure. After that, the connecting element is connected to a current source specially designed for this purpose. As a result of heating, the plastic begins to melt, hermetically connecting all the elements. You can learn more about working with such connectors by watching a video from the Internet.
Fitting
The most in an easy way to connect HDPE pipes is to use a compression fitting. Anyone can cope with this task, even without having any skills. Such fittings consist of:
Before starting work, you need to disassemble the design of the connecting element. Then, at the end of the pipe, we mark the distance at which it should go into the fitting. Next, after wetting it in water, we put on the connecting element. The last action is to tighten the nut cover (you do not need to use excessive force). The result is a connection without the risk of leakage, moreover, collapsible.
In addition, compression fittings have another plus - it is the ability to make connections of different (by material) pipes. Very often, when renovating an apartment, it is required to connect communications to old metal pipes. Compression fittings make this connection very easy. The work process is the same as in the case of joining two polyethylene pipes.
Reducing fitting
Reducing fittings are used if it is necessary to connect two pipes of different diameters. The principle of using this connector is the same as for the compression one.
Now the question of how to connect polypropylene pipes is popular. The most common method is diffusion bonding. In order to securely fix them, fittings are used: couplings, corners, adapters.
When installing a cold water supply system, polypropylene pipes will definitely last up to fifty years. They will serve for approximately twenty-five years when installing a hot water supply system. Remember that the duration of use depends on inlet pressure and temperature.
Polypropylene products are very durable, able to cope with any changes in the system. High pressure and low temperature conditions can in no way affect the duration of their operation. High pressure and temperature, which are recorded at the same time, will reduce the duration of pipe operation by five to seven years. In domestic pipelines, there are no extreme loads that can deform them, so there is no need to worry.
If you are interested in connecting with each other, pay your own attention to this unit. Cold products made of polypropylene are connected, then the joint is processed with the Fusioterm device. If you need to weld 2 ends of the pipes, they are inserted into a special hole in the device, after preheating the device to two hundred and sixty degrees. Then they are pulled out and connected.
If the radius is less than twenty millimeters, then it is possible to connect them by hand welding. A different method must be used to connect to a metal part. You will need a special soldering iron for socket soldering.
1. Cut a piece of the product with special scissors. If there is reinforcement, process it, clean the reinforcement layer in the cut area.
2. Put on gloves, warm up the soldering iron and start soldering.
3. Do everything quickly so that the joint area does not deform.
The question remains how to connect polypropylene pipes (in conditions high pressure) with metal? There are 2 methods. You need to choose one of them, starting from the radius.
1. For products with a radius of up to 20 mm, use threaded connections on the metal part of the system. Fittings, on one side of which there is an ordinary coupling for mounting to plastic, and on the other - the required thread, are sold everywhere. In order to seal steel threads, use linseed oil or modern sealing materials. This will ensure the durability of the connection.
2. For larger sizes, it is better to use flange connections. Iron threads with a radius of 300 mm cannot be screwed by hand, even if you are a strong man. So how, then, to combine a metal pipe and a polypropylene pipe, if they are large in diameter? Use special adapters available from the store.
Threads and flanges allow connecting metal and polypropylene pipes without soldering, which is very convenient.
It is difficult to choose anything specific from the wide range provided by many manufacturers. There are criteria that must be followed when purchasing.
1. Products must be in accordance with the characteristics of the water supply / heating system.
2. In order to properly assemble the system, you need to purchase all the parts from one manufacturer. This approach will create a reliable and durable structure.
3. When choosing, pay attention to the quality of pipelines, fittings. Evaluate the following:
4. Remember that polypropylene products are designed to operate at a temperature of at least minus twenty. Ask the store for how to store them during the winter. Improper storage leads to deformation of products.
5. If water for drinking will go through the water supply, ask the seller if the product meets the standards of sanitation and hygiene.
6. Buy only straight pipes, no bends. In stores, they are stored vertically, so they gradually bend, they cease to be even. Be sure to pay attention to this.
7. Choose products from trusted manufacturers who have proven themselves well, have all the necessary certificates. Trying to save money, you can buy a low-quality product that will not be able to serve you for the entire operational period. Therefore, it is better to pay more once, than to spend money again and carry out complex repairs of the water supply / heating complex.
Polyethylene pipes low pressure can be connected in detachable and non-detachable ways. Below we will discuss each of these methods.
This type of connection is used for diameters up to 315 mm inclusive, but it is advisable to use it for diameters not exceeding 110 mm. It is as reliable as the one-piece methods.
Its advantages:
Connectors (fittings, couplings) are mounted in the following order:
This is the fastest and least expensive method of assembling pipelines. Can be easily applied at home.
Polyethylene couplings are of several types:
Couplings are straight and angled. The types of couplings are shown in the table.
Compression fittings - variety connecting parts for plumbing.
Installing them is similar to installing couplings.
It is used on main pipelines of large diameter (at least 40 mm) for the installation of valves, valves, regulators (for their subsequent removal for repair or replacement).
To fix the flanges, special couplings are welded to the ends of the pipeline, then the flanges are screwed onto them.
The only possible method for joining large diameters.
Such welding is desirable to connect workpieces with a wall thickness of at least 5 mm.
The ends are cleaned, the chamfer is removed, inserted into a special heater, melted, then the workpieces are joined, pressed and held motionless until completely cooled.
The two pipes to be connected are inserted into a special sleeve, inside which there is a heating element. Then voltage is applied to it from a special apparatus, the coupling and workpieces are heated and welded. Highly convenient way welding. And very expensive. On large diameters, the cost of the coupling will be much higher than the cost of the pipeline at your site.
When performing this type of welding, special attention should be paid to preliminary cleaning of the ends and immobility of the connection until the moment of complete cooling.
Pipes with noticeably pronounced ellipticity must not be connected - the quality of the seam will be unsatisfactory.
After welding, the welded assembly must be stationary until it cools completely.
Do not neglect cleaning the ends of the earth, dust, sand, shavings and degreasing - these little things noticeably affect the quality of the seam.
Polyethylene and polypropylene are not welded. Correctly connect them together only with fittings. On the ends to be connected, weld or put on an MRV (female-threaded couplings) of the appropriate material, screw a quick-detachable threaded connection ("American") onto one MRV, then connect two MRVs using a union nut.
Such joining is performed similarly to joining HDPE and polypropylene. Steel piping is usually threaded. You can use the drive instead of the American woman - but this option has already outlived its usefulness.
On large lines, a valve or gate valve is usually mounted at such joints - in this case, a flange connection can be used.
We hope that our article helped the reader understand the intricacies of connecting low-pressure polyethylene pipes with his own hands. Share useful information with friends and acquaintances on the social network, invite your friends and subscribe yourself to our newsletter - and you will always be fully armed to start any home repairs.