Square plastic pipe. Square profile plastic pipes - characteristics and scope of application

Plastic materials are widely used in the construction of buildings, construction of pipeline channels, etc. Pipes with a square cross-section fit together better than their round counterparts, and have a number of other useful features.

In this article you will learn a lot useful information regarding the properties and purpose of these structures.

Product purpose

The products in question are used in a variety of fields.

Square pipes have become widespread in such areas as:

furniture manufacture;
construction various designs inside buildings;
Agriculture;
creation of cable channels;
production of plastic windows;
creation of pipelines and ventilation ducts.

Each direction has its own types of products considered. This must be taken into account when purchasing it.

Key Features

Plastic ones have both pros and cons.

Among the advantages of this product are:

high levels of tightness;
low noise;
environmental friendliness;
long period of use;
simple care;
resistance to environmental influences.

In addition, transportation of square structures is much more convenient. Unlike their round counterparts, they can be folded more compactly. If you decide to buy the product in question, be sure to consider its disadvantages. They greatly limit its use.

Disadvantages of pipe products square section applies:

low fire resistance;
complex installation, which is not easy to complete without the use of special tools;
limited the lineup for transporting hot liquids;
the need to limit structures from prolonged contact with hot air.

Plastic profile pipes square section should be used exclusively for its intended purpose. Improper use of products can lead to serious consequences.

Types and properties of products

Today there are various square plastic pipes.

The most widely used products are those made from:

Polypropylene.
Fiberglass.

1. Polyvinyl chloride structures

This type of product is the most popular. It is installed using cold welding or the socket method. Connections are also made using fittings. Installation can be carried out in both open and hidden ways. It is also important that the price of PVC products in Kyiv (Ukraine) is cheaper than the cost of analogues made of galvanized steel.

One meter of square polyvinyl chloride pipe weighs approximately five kilograms. The surface inside the structure has a low roughness index. Therefore, silting does not occur in these products. They clean themselves perfectly. The probability of pressure reduction in the structures under consideration is zero.

The advantages of square PVC products are:

environmental friendliness;
resistance to corrosion processes;
resistance to ultraviolet radiation;
resistance to the influence of bacteria and other microorganisms;
resistance to aggressive environments.

Along with the advantages, products made from polyvinyl chloride also have their disadvantages. It is worth noting that this material loses its color (lightens) under the influence of sunlight. Structures made from it are very sensitive to bending and physical influences. The material does not withstand prolonged contact with liquids whose temperature exceeds one hundred degrees.

Square PVC products can only be laid in the ground in a special container. In addition, this product is characterized by high noise when transporting liquids. Most often it is used for arranging ventilation ducts. But these products are also used in the manufacture of furniture and plastic windows.

2. Polypropylene structures

Such products can be multi-layer or single-layer. The weight of a meter of this type of product is approximately seven kilograms. The surface inside the pipe is smooth. The strength level is from twenty-eight to thirty-five megapascals.

The advantages of the product include:

resistance to corrosion processes;
ability to withstand temperatures from +140 to -95 degrees;
resistance to chemicals;
resistance to biologically hazardous microorganisms;
low weight;
ease of transportation.

The designs under consideration are quite reliable, but they also have a number of disadvantages. These products are characterized by low tightness. To correct this disadvantage, you need to connect the unit with metal pipes.

The installation of polypropylene square products is quite simple. This is due to the presence of a large number of connecting components. Products are produced in various segments. This allows you to greatly reduce the consumption of materials when installing a pipeline system. They are used to create water pipes, cable ducts and nipple systems for arranging drinking stations for birds and animals.

3. Fiberglass structures

Fiberglass products

This type of pipe products is used in industry and construction. The products are manufactured using the pultrusion method. The method consists of creating and curing a rod onto which polymer composition using dies, which are high-strength forms.

The manufacturing material of the product in question has a low specific gravity. It can be up to two grams per cm3. The important thing is that the strength of fiberglass is nine times higher than that of polyvinyl chloride. In addition, this material is characterized by complete dielectricity. He is not afraid of corrosion processes. It is also resistant to chemically aggressive environments.

The advantages of the material in question include:

resistance to wet environments;
high thermal conductivity;
low coefficient of thermal expansion;
significant fire resistance;
resistance to microorganisms;
aesthetic appearance;
light weight;
resistance to temperature changes.

One of the disadvantages of fiberglass is its low thermal insulation. Otherwise, products made from it are superior to other plastic analogues. For this reason, these products have become widespread in areas where high performance characteristics are especially in demand. For example, in oil production and the coal industry.

In addition, fiberglass products have found their application in housing and communal services. They are ideal for arranging garbage chutes and central sewer channels. The products are also used as chimneys at thermal power plants and gas boiler houses.

Dimensions of structures

The key parameters when selecting square pipes are the cross-sectional index and wall thickness. Moreover, for some types of products the walls may have different thicknesses. It is for this reason that it is customary to distinguish between internal and external sections. The first indicator is key when designing pipeline systems.

The most common square pipes are the following sections:

10×10	20×20	30×30	45×45	80×80
15×15	22×22	35×35	50×50	100×100
16×16	25×25	40×40	60×60	120×120

The wall thickness of the products varies for each size. Moreover, these indicators may be different for each manufacturer. For example, for a 20x20 structure, the walls will have a thickness of 1.5 millimeters. While for a 50x50 product they will be four millimeters.

The color range of plastic square pipes can be very diverse. There are products in white, gray, black, red, yellow and green. There are also products on the market that have a color that imitates wood.

The designs considered are sold in lengths from one to five meters. Many distributors offer trimmed products. For example, pipes 3.5 or 1.5 meters long. To connect two structures you need to use special connecting components. To close the pipe, plugs corresponding to its cross-section are used.

Pipe laying

Docking square plastic products can be done by welding. Most often this method is used in the furniture industry. Installation of profiles of the same or different sections is carried out using fittings. When selecting a connecting component, the operating conditions must be taken into account.

Note that fittings can be used to join round and square pipes. To solve this problem, use a rubber coupling, fixed with clamps. A plug is a fitting that closes the product on one side.

Tees allow you to connect three structures at the same time. They are secured on each side with clamps.

Remember that the fewer joints there are in the system, the higher its reliability. If you decide to use polypropylene square pipes, consider the thermal expansion rate. When heated to sixty degrees, this product increases in length to nine millimeters.

If a component does not have enough room to expand, it may become damaged. Therefore, be sure to take this indicator into account when laying systems made of polypropylene structures.

In order for the pipeline to operate reliably and safely, special elements are added to it - temperature compensators. It is recommended to avoid installing piping systems in too tight spaces.

There are polypropylene products that include an aluminum layer. This element reduces the value of thermal expansion. But such products have a higher cost.

Possible problems

Violation of the integrity of the structure may be due to errors made during installation, physical damage to the pipeline, or the use of defective products. Temporary measures can be used to resolve the problem.

Mounting clamp

To eliminate a leak, you need to block the movement of the media through the system and tighten the clamp in place of the hole formed. You can also solve the problem with rubber. This method is used to repair heating and water supply systems. To implement it, you need to wrap problem area rubber and tighten it with wire or lace.

Leaks can also be repaired with paint. The puncture site is wrapped in cloth and painted over. It is not recommended to use the pipeline until it has dried.

There are more reliable methods of repairing damage. The first of these is the use of glue. To eliminate the defect, you need to degrease the leak area and dry it thoroughly. After this, it is treated with silicone sealant.

Silicone sealant

If the hole is through, it is repaired using a two-component epoxy adhesive mixture. Instead of winding, fiberglass is used. It is wound in five layers. Then treated with the same epoxy mixture. Next, wrap the area with sealing tape.

The second of the more reliable repair methods is called cold welding. To implement it, you need to treat the surface of the pipe with an abrasive material and degrease it. Next, cold welding wrinkles until Brown. It should resemble plasticine.

The material is applied to the damaged part of the pipe. Next, press it down with a tourniquet. After an hour, it is necessary to cut off the protruding irregularities. You can speed up the operation using a hairdryer. When performing this task, be sure to use special gloves and safety glasses.

Using a structure with a square cross-section will allow you to implement projects of any complexity. The beautiful appearance of such structures makes them especially in demand in a variety of fields. Depending on the cross-sectional size, the cost of square pipes can range from 0.75 to 50 US dollars per meter.

Watch the video:

Plastic pipes with a square cross-section are used to build houses, arrange industrial pipelines and ventilation systems. It is easier to connect square products than round ones.

Areas of application

Square pipes are used in a number of applications:

Furniture manufacturing. Fences made from square pipes also look very original, surpassing metal products in certain characteristics.
Construction works . This applies to both indoor and outdoor use. IN agriculture plastic profile pipes are often used to connect the nipple system, which provides duck, goose, rabbit and other drinkers. When selecting dimensions, take into account the thickness of the profile in order to achieve vertical retention of the entire system. When installing, it is important to maintain perpendicularity to the nipple, which will allow you to set up the drip mode without losing water.
Making greenhouses. The structures are durable and inexpensive.
Cable channels, air ducts. In this case, a large plastic square pipe is used.
Production of plastic windows.

Strengths and weaknesses of square plastic pipes

TO strengths This product has the following characteristics:

They tolerate climatic influences well.
Undemanding in maintenance.
They are not afraid of corrosion.
Long-term operation.
Environmentally friendly.
Water transportation is not accompanied by characteristic noise.
Excellent hermetic performance.
Cheaper transportation and storage: this is facilitated by a more convenient form for storage.

Weak fire resistance.
Recommendations for limiting contact with heated air.
Not an easy installation, requiring specific skills and equipment.
Some products are not intended for hot water.

Types and features of square plastic pipes

Polyvinyl chloride (PVC)

The most common type of product, for installation of which cold welding or socket method is used. A square PVC pipe is connected with fittings. For laying such pipelines, closed and open method. The price of polyvinyl chloride products is an order of magnitude lower compared to galvanized ones metal pipes(read also: “Types of profile galvanized pipes, their application and scope of use”).

Weight of one linear meter PVC pipes– 5.62 kg. The inside of this product is very smooth, which allows the material to self-clean and avoid reducing the speed of liquid transport.

Advantages of PVC pipes:

Resistance to chemical influences.
Not afraid of chlorination and active substances.
Biological stability.
UV protection.
Inert to corrosion.
No harmful fumes.

When exposed to direct rays of the sun for a long time, the products begin to lighten.
They do not withstand shocks and bending well.
Not able to withstand boiling water.
Direct underground laying: This will require special protective boxes.
When transporting water, a certain amount of noise occurs.

Most often plastic rectangular pipe used for ventilation.

Polypropylene

Products of this type may consist of one or several layers. One linear meter polypropylene pipe weighs 7.06 kg. The internal cavity is characterized by smoothness, with a strength of 28-35 MPa.

Corrosion resistance.
Chemical inertness.
Not afraid of any kind of biological influences, including fungi and bacteria.
Light weight, which greatly simplifies transportation.
The ability of some models to comfortably withstand temperature changes from - 95 to + 140 degrees.

Weak level of tightness (node connections with metal pipes are an exception).
Poor tolerance to frost.

Square plastic pipes are quite easy to assemble, fortunately they are available for sale big choice shaped spare parts that allow reliable joining to any structure. These connecting elements are available in a wide range of sizes, which allows you to minimize cutting waste.

Made from fiberglass

Used in construction and industrial areas. To produce this profile, the pultrusion method is used, during which a rod impregnated with polymer fibers is formed and separated: for this purpose, special high-strength forms are used - dies.

Fiberglass is characterized by a small specific gravity in 0.4 – 2 g/cm3. The strength of these products is twice that of PVC products. Due to their dielectric properties, plastic square pipes are considered completely safe. They are not afraid of corrosion and chemical activity: substances such as salt, alkali, acid, sodium hydroxide, ferric chloride, etc. are unable to cause damage to fiberglass products (read also: “Types of fiberglass pipes, characteristics, connection methods”).

Low coefficient of thermal expansion.
They are not afraid of moisture and temperature fluctuations: they can withstand temperatures from -60 to + 80 degrees.
They have a small mass.
They withstand flame well.
They look beautiful from the outside.
Conducts heat well.
Resistant to biological influences.

The disadvantages of fiberglass pipes include the fact that they have poor thermal insulation.

Design features

When choosing a suitable plastic pipe, you mainly pay attention to its diameter and cross-section. The walls are characterized by a certain thickness; moreover, in some models one of them may be somewhat thicker. For this reason, it will be necessary to select a section of external and internal type. It is the internal section that requires special consideration during project development. Each section is characterized by its own wall thickness, and these indicators may vary depending on the manufacturer. For example, a 20x20 pipe is characterized by a thickness of 1.5 mm, 35x35 - 3 mm, 50x50 - 4 mm.

The range of colors is characterized by a certain breadth: these include ordinary white, black, gray colors, and somewhat non-standard green, red, yellow, blue. There are also imitations of various wood species.

Standard sizes for the length of these pipes are 1, 3, 4 and 5 meters. At sales points they can cut off any required piece of 3.5 or 1.5 meters. To connect two separate sections, it is better to use a fitting, and to close the hole, a plug, which must be of a suitable diameter.

A square plastic profile pipe is connected by welding: most often structures and furniture are made this way. It is more convenient to use fittings for these purposes: this applies not only to connecting square products to each other, but also to those cases when a square pipe needs to be joined to a round one. When choosing a connection method, the conditions in which the product will be used are usually taken into account.

Plastic profile pipes of square and round type are connected with rubber couplings: fixation in this case is carried out with clamps. To design the ends of the profile, plug couplings are also available for sale. For assembling pipes with different sections adapters are used. To connect three square pipes at once, there are tees, where each side is equipped with a clamp.

To improve the result, you should try to reduce the number of joints to a minimum: it follows that unnecessary cutting of the profile should be avoided. If a pipeline made of polypropylene products is being installed, it is important to take into account the coefficient of thermal expansion: if the pipe is heated to + 60 degrees, it lengthens by 9 mm.

If such expansion encounters a lack of space, it may result in a pipe rupture. When the volumetric heating system or a pipeline for transporting hot water, it is important to take this factor into account in order to avoid emergency situations. To make the operation of such a system safer, it is equipped with temperature compensators. When laying such pipelines inside a home at a distance of more than 1 meter, close spaces should be avoided. An aluminum layer is included in the composition of individual polypropylene pipes: this makes it possible to reduce the expansion coefficient during heating. For such products a higher price is set.

Cautions

Reason possible problems Installation errors, mechanical damage during operation, or manufacturing defects may occur.

If such damage is detected on a plastic pipeline, you can apply one of following methods temporary elimination of the accident:

Metal clamp. The first step is to stop the movement of liquid inside the pipe, then use a clamp to cover the leaking area by tightening the side bolts.
Rubber. In this case, the problem area is tied with a piece of rubber: a clamp is installed on top of it or a wire is wound.
Painting. If we're talking about For minor leaks, you can apply paint by spreading it over the fabric winding.
Glue. The damaged area is cleaned, degreased and degreased. To seal a through hole, it is better to use two-component epoxy glue. In this case, a fiberglass bandage or sealing tape is used to wrap the problem area.
Cold welding . This way you can connect or repair any plastic pipes. After preparing the surface, the problem area is sealed with plastic material, which is previously kneaded in the hands. Having wrapped the sealed area with a tourniquet, you need to wait an hour, after which the protruding parts of the hardened material are cut off or sawed off.

Plastic square pipe: rectangular, PVC profile pipes, varieties

Characteristics of plastic profile pipes

Hollow, long, most often round object industrial production, based on a hollow profile of a specific cross-sectional shape, intended for transporting gases, liquids, steam and bulk masses, is called a pipe.

What types of pipes are there?

The following materials are used for the manufacture of such products:

non-ferrous and ferrous metals,
concrete,
ceramics,
tree,
glass,
various types of plastics,
combinations of the above materials.

In our article we will look at popular ones in many construction fields(and not only), plastic profile pipes and related parts.

Profile pipe made of plastic. Types of sections and plastics

Briefly and clearly, what a profile pipe is can be described in the following words. Any product with a cross-section that is not round in shape. It could be:

square,
rhombus,
rectangle,
triangle.

And even specially made profile pipes made of plastic, with a cross-section in the shape of a star.

The most common and widely available are pipes made of polyvinyl chloride (PVC). The advantages of this material and products made from it include:

resistant to aggressive chemical and biological influences, ultraviolet radiation, chlorination,
not subject to corrosive destruction,
environmentally friendly.

As disadvantages, it should be noted:

sensitive to external mechanical influences (rough),
afraid of excessively high temperature contacts (boiling water),
are considered noisy when liquid flows pass through them.

Polypropylene pipes

anti-corrosion,
withstand high temperatures up to + 140 degrees,
resistant to aggressive chemical and biological influences.

Disadvantage - does not withstand low temperatures well.

Fiberglass pipes have all the positive qualities of PVC and polypropylene pipes, with the disadvantage of low thermal insulation qualities.

Areas of application of profile pipes made of plastics

Profile pipes made of PVC, HDPE (LDPE) are used in many sectors of the national and municipal economy, as:

technical boxes (protection) of main pipeline networks made of metal.
individual sections and pipeline networks.
hidden channels (underground) for laying electrical, fiber optic and other types of cable.
plumbing, drainage, etc. communications.
ventilation ducts.

And also, as building materials for greenhouse frames, support pillars fences (profile plastic pipe 60x60) and the like. For example, a 40x40 profile plastic pipe is widely used for creating easy, country (beach) furniture and other items.

IN household use, this type pipes, almost completely replaced their metal counterparts in:

The main advantages of profile pipes over metal products

Plastic profile pipes:

available,
have a large selection of materials, sizes (length, wall thickness) and sections,
easy to install,
have little weight, which is reflected in ease of storage, transportation and installation,
have a long service life,
significantly lower in cost than metal products.

Technical parameters used in the production of profile plastic pipes

These parameters include the following values:

internal and external diameter of the pipe.
Wall thickness.

That is, to the same characteristics as standard metal pipes, but adjusted for the specific properties of plastics.

Flexible and rigid profile pipes made of plastic

According to technical regulations, production of flexible profile pipes large section(meaning a circular bend) is not possible. And by and large, there is no such need. Mostly them inner size varies from 60 to 500 millimeters. The only type of large-sized profile pipe made of plastic, and even then with a large degree of convention, can be classified as corrugated pipes.

The rigid type of profile pipes has a cross-section from 100 to 1200 millimeters with a wall thickness of up to 7 - 8 mm.

These products are made by extrusion from polyethylene (recycled) granules with the addition of other materials (glass, plastic, metal, plastic pipes). And they fully comply with sanitary, hygienic and environmental requirements. For the convenience of customers, rigid pipes are produced in various lengths and cross-sectional sizes.

Related parts of plastic profile pipes

Of course that high-quality installation profile plastic pipes is not possible without:

connecting and transitional, welded and threaded couplings,
plugs for pipes of different shapes and cross-sectional sizes,
corner knees,
bends,
tees,
flange bends, etc.

As a rule, components for profile pipelines made of plastic are made from the same materials as the pipe. But in some cases they can be used when working with other software technical specifications material. For example, plugs made of all types of plastic have long replaced metal ones.

Colors of profile pipes made of polypropylene (polyethylene, PVC)

The main colors of plastic pipes can be called white and black (their shades). Light-colored pipes usually include water pipes. The rest, the so-called technical pipes, are used, based on the name, for laying sewer and drainage communications, ventilation, and the like. Depending on the manufacturer, there may be various shades. Which is convenient when laying nearby technical channels of the same profile shape and size with different contents (electrical, telephone, antenna, etc. cables) to indicate them.

PVC plastic profile pipes

An article that explains what PVC plastic profile pipes are, with detailed description characteristics.

Plastic rectangular pipes for ventilation advantages and disadvantages

Air duct systems made of plastic are widely used not only in residential premises, but also in industrial buildings, and the high increase in popularity is associated with incredible practicality and excellent strength indicators. Ducts can be elliptical, round, rectangular or square and are used for natural or forced ventilation, as well as for the removal of gases. Ventilation air ducts made of plastic allow the structure to be given the required shape and are ideally installed in places with difficult accessibility.

At the moment, plastic products in terms of the number of products produced per year have surpassed their galvanized counterparts, which have been bestsellers in the category of ventilation equipment for quite a long time.

In residential buildings and household premises Ducts are typically used during the installation of mechanical ventilation systems to provide exhaust carbon dioxide and delivery fresh air. In addition, the use of air ducts cannot be dispensed with during installation. channel system air conditioning of the room, since air cooled by the equipment from the working device can only be supplied using ventilation pipes. In many residential buildings Plastic ventilation ducts are used for kitchen hoods.

Air duct cross-section

The cross-section of ventilation pipes, as a rule, is selected depending on the location of the equipment, for example, if there is not much space between the ceiling and the main floor, flat-oval structures are best suited, which can be easily installed in places with difficult accessibility. In their form, these products are not much different from ventilation pipes with round, and their flattened design is achieved using special equipment in production facilities.

Ventilation pipes made of plastic of this type can be easily installed in the space between suspended ceiling, and pipes located in visible places are significantly more attractive than similar systems other forms.

It is worth noting that, in addition to aesthetic pleasure, flat-oval plastic pipelines have other advantages. They, unlike rectangular structures, do not provide serious resistance to air flow, so the exhaust products move easily and ventilation equipment works more efficiently.

Despite the somewhat inflated cost of structures of this form, they fully pay for themselves due to unique performance qualities. Now you can purchase air ducts with a flat-oval cross-section at any hardware store or mall, where there is a department with ventilation equipment.

IN country houses and cottages ventilation pipes made of polymers are often used for air conditioning systems in a natural way, as well as in heating and supply systems warm masses air.

For quality installation manufacturers of air duct systems produce various fittings and fittings that are used to cover individual elements hoods and allows you to connect parts of the structure with each other.

In addition, you can find a huge selection of fasteners on the market, with which you can ensure a strong and reliable connection on the surface of the walls. The right fasteners can improve the appearance of the system and also seriously save space. To best seal the joints in the ventilation system, special sealants are used that prevent air flows from escaping at the junctions of individual sections.

Selecting the type of duct equipment

Moving on to the problem of choosing an air duct, it is initially worth determining its main purpose, ventilation dimensions and type. For a specific hood, the air duct system is selected individually in order to ensure the highest possible quality of operation of the entire structure. As in all other types installation work, the installation of a ventilation system should begin with a draft design, in which it is necessary to take into account all issues of the location, installation and operation of the equipment, taking into account the area and other features of the room.

This suggests that it is advisable to trust the design and installation of the ventilation system professional companies, which have on staff specialists with necessary tools and level of knowledge. When drawing up a project, it is necessary to correctly calculate the performance of all parts so that the operation of the equipment does not create unnecessary noise and does not interfere with the normal functioning of people.

Many buildings are initially designed in such a way that there is practically no space left for pipelines and the owner of the premises must install ventilation with a narrow cross-section. This leads to the fact that air in small diameter pipes can emit high level noise during equipment operation.

The optimal diameter of a plastic ventilation pipe, through which air will move at a speed of less than 3 meters per second, can be calculated using the easy formula: S = 0.9L.

Here, S is the cross-sectional area of the pipe in square centimeters, L is the air flow rate.

Using this formula, you can easily determine the most suitable pipe diameter in this case, which will guarantee a high level of performance of the entire exhaust system.

When choosing a team of installers who will install the ventilation system, you should not try to save money on workers offering cheap services, because even a slight error during work or incorrect calculations can lead to whole line troubles in the future.

For example, an air leak from a ventilation system may come from a place with poor sealing, which is quite difficult to find. Ignoring the characteristics of the equipment and premises during installation, as a rule, leads to premature failure of the main hood devices, the repair or replacement of which is quite expensive. The customer has every right to constantly monitor the installation process, make amendments and wishes, and insist on careful compliance with all technological documentation.

Plastic ventilation pipes have their own established dimensions, so replacing a failed part is not a big problem. You need to know that rectangular and square ventilation structures resist air flow more than their counterparts of other shapes, which makes it difficult for the substance to escape through the system. In addition, profile plastic pipes are more susceptible to noise during system operation. Manufacturers of products with an oval or round cross-section assure potential buyers that installing two round air ducts without corners is much more practical than one rectangular or square one.

However, it is worth noting that such ventilation will have best characteristics only in the situation where the pipeline runs in a straight line. The cost of tees, turns and other fittings for changing the direction of the structure is twice as high, so in systems with numerous joints and turns, the use of round or oval pipes is unlikely to be convenient and economical.

To prevent unnecessary noise in air ducts rectangular section When installing, you need to lay a layer soundproofing material, which effectively absorbs sounds emitted by the air during equipment operation and prevents them from entering the room.

Advantages and disadvantages of plastic air ducts

Plastic equipment for ventilation, compared to metal counterparts, produces much less noise. The fewer joints there are in the design, the better. Plastic ventilation structures are lightweight, which makes them easy to transport in Right place and install it yourself. During installation, the pipes must be treated with an antistatic solution so that dust contained in the air is not attracted to the material.

Cleaning exhaust systems made of plastic is a labor-intensive and expensive procedure, so initial treatment with an antistatic agent reduces the need for this process. In addition, this approach allows you to keep the inner surface of the pipes as smooth as possible, which virtually eliminates friction losses. Plastic is used in a wide range of temperature range from -40 to +90 degrees Celsius, which allows it to be used to remove hot air currents.

Like any other product, plastic ventilation pipes have their drawbacks. These include the rather labor-intensive installation process in cottages equipped with steam protection and a low fire resistance rating. If the system was assembled correctly and with high quality, plastic ventilation pipes will work for a long time and ensure ideal operation of the ventilation system.

Rectangular plastic pipes for ventilation

For the manufacture of rectangular plastic ventilation, polyvinyl chloride (PVC) is usually used - a unique material of its kind that has a large number of benefits. It is environmentally friendly, resistant to mechanical damage, elastic, resistant to temperature changes and impact chemical elements, has a small specific gravity.

In addition, one of the biggest advantages of plastic structures is their ability to fit seamlessly into any interior. These products do not require additional finishing after installation. The smoothed shapes of the air duct system and aesthetic appearance will not attract attention as in administrative buildings, and in residential premises.

The smooth external and internal surface of PVC products ensures a minimum coefficient of friction during the passage of air. Such a smooth coating does not retain microscopic particles, for example, fat, which, if settled, can clog the internal section of the system. You can remove grease using a soap solution.

Color similar products may vary, but usually in stores you can find white, solid color or wood shade. If none of the options suits you, you can paint the air duct yourself, cover it with adhesive tape or wallpaper to match the color of the interior of the room, cover it with sheets of PVC plastic, make a box from plasterboard and then finish it.

Despite the fact that on modern market a wide range of plastic structures, not every store offers everything you need.

The cost of exactly the same products in different places may vary significantly, so you should carefully review all offers in your area before purchasing a product. This will save you a lot of money. It is advisable to purchase a set of products from one manufacturer, since additional parts and plastic pipes from one company have the most suitable friend friend sizes. When purchasing a product, you should pay attention to the presence of a quality certificate, the absence of mechanical damage and the geometric correctness of components and pipes.

Installation of polymer systems is not required professional equipment, you only need a hammer drill, a tape measure, a hacksaw, a marker and a building level. The ventilation structure can be installed in several ways, most often it is laid on furniture. If the installation takes place in the kitchen, then the air duct can simply be installed on hanging cabinets. The free movement of the joints allows you to carefully adjust the dimensions of the plastic pipe for the hood.

Is a plastic pipe good for ventilation?

The use of plastic rectangular pipes as air ducts for ventilation of buildings. Types of pipe sections, calculation of the required diameter.

Square profile plastic pipes - characteristics and scope of application

Plastic materials are widely used in the construction of buildings, the construction of pipelines and ventilation systems. Pipes with a square cross-section fit together better than their round counterparts, and have a number of other useful features.

In this article you will learn a lot of useful information regarding the properties and purpose of these structures.

Product purpose

The products in question are used in a variety of fields.

Square pipes have become widespread in such areas as:

furniture manufacture;
construction of various structures inside buildings;
Agriculture;
creation of cable channels;
production of plastic windows;
creation of pipelines and ventilation ducts.

Each direction has its own types of products considered. This must be taken into account when purchasing it.

Key Features

Among the advantages of this product are:

high levels of tightness;
low noise;
environmental friendliness;
long period of use;
simple care;
resistance to environmental influences.

The disadvantages of square pipe products include:

low fire resistance;
complex installation, which is not easy to complete without the use of special tools;
limited range of models for transporting hot liquids;
the need to limit structures from prolonged contact with hot air.

Square plastic profile pipes should be used exclusively for their intended purpose. Improper use of products can lead to serious consequences.

Types and properties of products

Today there are various square plastic pipes on sale.

The most widely used products are those made from:

1. Polyvinyl chloride structures

The advantages of square PVC products are:

environmental friendliness;
resistance to corrosion processes;
resistance to ultraviolet radiation;
resistance to the influence of bacteria and other microorganisms;
resistance to aggressive environments.

2. Polypropylene structures

The advantages of the product include:

resistance to corrosion processes;
ability to withstand temperatures from +140 to -95 degrees;
resistance to chemicals;
resistance to biologically hazardous microorganisms;
low weight;
ease of transportation.

3. Fiberglass structures

This type of pipe products is used in industry and construction. The products are manufactured using the pultrusion method. The method involves creating and curing a rod onto which a polymer composition is applied using dies, which are high-strength molds.

The advantages of the material in question include:

resistance to wet environments;
high thermal conductivity;
low coefficient of thermal expansion;
significant fire resistance;
resistance to microorganisms;
aesthetic appearance;
light weight;
resistance to temperature changes.

One of the disadvantages of fiberglass is its low thermal insulation. Otherwise, products made from it are superior to other plastic analogues. For this reason, these products have become widespread in those areas where high performance characteristics are especially in demand. For example, in oil production and the coal industry.

Dimensions of structures

The most common square pipes are the following sections:

Pipe laying

Joining of square plastic products can be done by welding. Most often this method is used in the furniture industry. Installation of profiles of the same or different sections is carried out using fittings. When selecting a connecting component, the operating conditions must be taken into account.

Note that fittings can be used to join round and square pipes. To solve this problem, use a rubber coupling, fixed with clamps. A plug is a fitting that closes the product on one side.

Tees allow you to connect three structures at the same time. They are secured on each side with clamps.

If a component does not have enough room to expand, it may become damaged. Therefore, be sure to take this indicator into account when laying systems made of polypropylene structures.

In order for the pipeline to operate reliably and safely, special elements are added to it - temperature compensators. It is recommended to avoid installing piping systems in too tight spaces.

There are polypropylene products that include an aluminum layer. This element reduces the value of thermal expansion. But such products have a higher cost.

Possible problems

To eliminate a leak, you need to block the movement of the media through the system and tighten the clamp in place of the hole formed. You can also solve the problem with rubber. This method is used to repair heating and water supply systems. To implement it, you need to wrap the problem area with rubber and tighten it with wire or lace.

Leaks can also be repaired with paint. The puncture site is wrapped in cloth and painted over. It is not recommended to use the pipeline until it has dried.

The second of the more reliable repair methods is called cold welding. To implement it, you need to treat the surface of the pipe with an abrasive material and degrease it. Next, cold welding crumples to a brown color. It should resemble plasticine.

The material is applied to the damaged part of the pipe. Next, press it down with a tourniquet. After an hour, it is necessary to cut off the protruding irregularities. You can speed up the operation using a hairdryer. Be sure to wear special gloves and safety glasses when performing this task.

Square profile plastic pipes - characteristics and application

Areas of application and key features of square pipes. Advantages and disadvantages of this type of profile products

With the help of plastic pipes with a square cross-section, houses are built, industrial pipelines and ventilation systems are installed. It is easier to connect square products than round ones.

Areas of application

Square pipes are used in a number of applications:

Furniture manufacturing. Fences made from square pipes also look very original, surpassing metal products in certain characteristics.
Construction works. This applies to both indoor and outdoor use. In agriculture, plastic profile pipes are often used to connect nipple systems that provide duck, goose, rabbit and other drinkers. When selecting dimensions, take into account the thickness of the profile in order to achieve vertical retention of the entire system. When installing, it is important to maintain perpendicularity to the nipple, which will allow you to set up the drip mode without losing water.
Making greenhouses. The structures are durable and inexpensive.
Cable channels, air ducts. In this case, a large plastic square pipe is used.
Production of plastic windows.

Strengths and weaknesses of square plastic pipes

The strengths of this product include the following characteristics:

They tolerate climatic influences well.
Undemanding in maintenance.
They are not afraid of corrosion.
Long-term operation.
Environmentally friendly.
Water transportation is not accompanied by characteristic noise.
Excellent hermetic performance.
Cheaper transportation and storage: this is facilitated by a more convenient form for storage.

List of disadvantages:

Weak fire resistance.
Recommendations for limiting contact with heated air.
Not an easy installation, requiring specific skills and equipment.
Some products are not suitable for hot water.

Types and features of square plastic pipes

Polyvinyl chloride (PVC)

The weight of one linear meter of PVC pipe is 5.62 kg. The inside of this product is very smooth, which allows the material to self-clean and avoid reducing the speed of liquid transport.

Advantages of PVC pipes:

Resistance to chemical influences.
Not afraid of chlorination and active substances.
Biological stability.
UV protection.
Inert to corrosion.
No harmful fumes.

Flaws:

When exposed to direct rays of the sun for a long time, the products begin to lighten.
They do not withstand shocks and bending well.
Not able to withstand boiling water.
Direct underground installation is prohibited: this will require special protective boxes.
When transporting water, a certain amount of noise occurs.

Most often, a plastic rectangular pipe is used for ventilation.

Polypropylene

Products of this type may consist of one or several layers. One linear meter of polypropylene pipe weighs 7.06 kg. The internal cavity is characterized by smoothness, with a strength of 28-35 MPa.

Strengths:

Corrosion resistance.
Chemical inertness.
Not afraid of any kind of biological influences, including fungi and bacteria.
Light weight, which greatly simplifies transportation.
The ability of some models to comfortably withstand temperature changes from - 95 to + 140 degrees.

Flaws:

Weak level of tightness (node connections with metal pipes are an exception).
Poor tolerance to frost.

Square-section plastic pipes are quite easy to assemble; fortunately, there is a large selection of shaped spare parts on sale that allow reliable connection to any structure. These connecting elements are available in a wide range of sizes, which allows you to minimize cutting waste.

Made from fiberglass

Used in construction and industrial sectors. To produce this profile, the pultrusion method is used, during which a rod impregnated with polymer fibers is formed and separated: for this purpose, special high-strength forms are used - dies.

Strengths:

Low coefficient of thermal expansion.
They are not afraid of moisture and temperature fluctuations: they can withstand temperatures from -60 to + 80 degrees.
They have a small mass.
They withstand flame well.
They look beautiful from the outside.
Conducts heat well.
Resistant to biological influences.

The disadvantages of fiberglass pipes include the fact that they have poor thermal insulation.

Design features

Size

Colors

Length

Installation

Plastic profile pipes of square and round type are connected with rubber couplings: fixation in this case is carried out with clamps. To design the ends of the profile, plug couplings are also available for sale. Adapters are used to assemble pipes with different sections. To connect three square pipes at once, there are tees, where each side is equipped with a clamp.

If such expansion encounters a lack of space, it may result in a pipe rupture. When installing a volumetric heating system or a pipeline for transporting hot water, it is important to take this factor into account in order to avoid emergency situations. To make the operation of such a system safer, it is equipped with temperature compensators. When laying such pipelines inside a home at a distance of more than 1 meter, close spaces should be avoided. An aluminum layer is included in the composition of individual polypropylene pipes: this makes it possible to reduce the expansion coefficient during heating. For such products a higher price is set.

Cautions

Possible problems may be caused by installation errors, mechanical damage during operation, or manufacturing defects.

If such damage is detected on a plastic pipeline, you can use one of the following methods to temporarily eliminate the accident:

Metal clamp. The first step is to stop the movement of liquid inside the pipe, then use a clamp to cover the leaking area by tightening the side bolts.
Rubber. In this case, the problem area is tied with a piece of rubber: a clamp is installed on top of it or a wire is wound.
Painting. If we are talking about a minor leak, you can apply paint by spreading it over the fabric winding.
Glue. The damaged area is cleaned, degreased and degreased. To seal a through hole, it is better to use two-component epoxy glue. In this case, a fiberglass bandage or sealing tape is used to wrap the problem area.
Cold welding. This way you can connect or repair any plastic pipes. After preparing the surface, the problem area is sealed with plastic material, which is previously kneaded in the hands. Having wrapped the sealed area with a tourniquet, you need to wait an hour, after which the protruding parts of the hardened material are cut off or sawed off.