Sealant for gas connections overview of products for pipe installation

Have you noticed how many different ways experienced craftsmen can offer to solve the same problem? The construction of a gas pipeline is no exception. Thus, the connection of gas pipes by professional gas workers is carried out using different materials and techniques. The craftsmen's arsenal includes carving and welding, soldering and flanges. They actively use techniques that have been proven for decades and those that have recently emerged.

Knowing the basic methods, understanding the tools and modern materials, it is easier to track the correctness of the work and monitor the actions of invited specialists.

In this article we have described the main options for fastening gas pipes and methods for sealing joints. After reading it, you will understand the types of pipes, the characteristics of materials, and the technologies for working with them. We paid special attention to methods for checking connections that have already been made, since the safety of operation of household gas equipment depends on their correctness.

Types of pipe connections

There are several main ways to connect gas pipes, or rather:

Welding - carried out exclusively by specialists who have permission to work with a welding machine. Each employee must have a personal identification card.
Threaded or fitting - also involves welding lightweight pipes, with the sockets sealed using hemp fiber. The whole process of work is very much reminiscent of connecting sewer pipes. It is worth noting that the fiber is pre-impregnated with a solution of linseed oil or drying oil. You can also use couplings that can have either long or short threads.
Flange is one of the most common connection methods, as it has a fairly lightweight assembly design. However, according to experts, it is less reliable than welding.

All of the connection methods described above are used by professional craftsmen using specialized equipment.

In order to independently connect gas pipes in a house or apartment, you need to prepare the following tools and materials:

gas adjustable wrench;
tow and grease;
hoses or pipe connections;
if necessary, a connector with threads on both sides.

If you turned off the gas supply and purged the pipes, as recommended earlier, then the next step is to cut off unnecessary parts of the gas pipes. To do this, you can use a grinder, and if you don’t have one, then a hacksaw is quite suitable, but in this case the process will be lengthy and more complicated.

After you have removed the unnecessary part of the gas pipe, you need to carefully weld or solder one end of it.

If you need to connect one end of the pipe to a gas hose, you will need to cut a thread on the sawn part. To do this, there is a special nozzle, putting it on, you will need to scroll several times.

Next, tow is wound onto the thread made, which is soaked with lubricant and a connection is made to the hose. All this work is carried out using a gas adjustable wrench. If you plan to install a new pipe, you can use a special connecting adapter. This element has a ready-made thread on both sides and a nut that is screwed onto the main and new pipes.

This method can be used in apartments, you just need to make sure there are no leaks. To do this, you need to open the gas supply, then apply a soap solution to all pipe joints.

If you have never done such work yourself before, then it is best to entrust this matter to professionals.

Gas stove connection diagram

Schematically, connecting the stove to gas is as follows: a gas riser passes through the kitchen room, from which a branch pipe with a tap at the end is connected, which is connected to the stove. This piece is also called a drop or tap.

In older houses, a petal type faucet is installed on the slopes. When reconnecting, it is recommended to replace it with a ball one. It takes up less space and is more convenient to use

A rubber-fabric hose is screwed into the faucet, through which gas is supplied. For old houses, it is common to place the slab on a metal pipe. This method is inappropriate to use, because in this case the location of the device will be stationary.

In remote areas of the private sector, where there is no access to a main gas pipeline, gas is used in cylinders. Only a gas service specialist is allowed to connect to such equipment.

Sealing of household air ducts

Ventilation in apartments and country houses is carried out using thin-walled elements. Often, air ducts are made of rectangular cross-section or from corrugated pipe. Threading on such connections is not possible. Therefore, sealing ventilation joints is carried out in other ways:

through flanges,
applying a bandage,
using the socket method by inserting one air duct into another.

A flange connection is most often used for non-circular ducts. Sealing is carried out using gaskets made of soft material, for example, porous rubber. The shape of the gasket must match the cross-section of the air duct.

With other methods, the voids formed after joining the air ducts are filled with mastics whose temperature characteristics correspond to the operating conditions of the air line. Sometimes the joint of the air ducts is wrapped with self-adhesive tape.

Bandage clamps used for joining round air ducts

Why are insulating connections used on a gas pipeline?

An insulating connection (IC) for a gas pipeline allows you to separate sections from each other and prevent the occurrence of electrochemical corrosion. It ensures breaks in the galvanic connection of gas pipeline sections and eliminates the possibility of initiating corrosion processes.

Diagram of an insulating connection on a gas pipeline

ICs cut off grounded areas from the common branch that are in contact with adjacent equipment or structural elements. The gas pipeline IC increases the resistance between sections to values that prevent further propagation of currents along the length of the gas pipeline.

Most often, the protective device takes the form of flange connections equipped with a dielectric gasket. It is allowed to use only units manufactured at specialized enterprises and having the appropriate certificates. It should be taken into account that the use of an insulating connection is a mandatory clause of the technical regulations, the violation of which entails various consequences, including criminal prosecution.

Application of FUM

FUM tapes and threads are used for sealing threaded connections of hot water supply (DHW), heating systems (CO) and cold water supply (CW). They are also used when connecting gas appliances to the gas pipeline.

Fluoroplastic is a plastic and strong material with a melting point above 400 degrees, resistant to oxygen and aggressive liquids. The thread and tape fill the unevenness of the thread and ensure sealing of the joint. FUM sealing tapes are produced with a width of 10-16 mm and a thickness of 0.08-0.12 mm, FUM threads with a diameter of 0.4-1.5 mm. With temperature changes and vibration, the FUMs are deformed and the threaded connection leaks.

The thickness of the tape winding depends on the diameter of the pipe and the thickness of the tape. For pipes with a diameter of up to 20 mm, 2-3 layers of tape with a thickness of 0.12 or 1-1.5 layers of thread are wound. For pipes with a diameter of up to 40 mm, 5-6 layers or 2-3 layers of thread are wound. For pipes with a diameter of over 40 mm, 8 or more layers of tape or 5 or more layers of thread are wound. For main pipelines, it is preferable to use tapes with silicone mastics.

If the thread is covered with rust, the winding thickness is doubled. Before winding the tape, the threaded connection is cleaned with an iron brush and blown with compressed air. The tape and thread are wound onto the pipe or fitting thread under tension with a force of 0.5-1 kg clockwise. To seal the threaded connections of gas appliances, they are wound counterclockwise.

Wind with a cone from the edge of the joint. If, after cleaning the rust, holes and damage are noticeable on the threads, use a different sealant. FUM is used to seal undamaged threaded connections.

Do not use FUM to seal heating pipes. Temperature changes will damage the FUM, the connection will leak, and water or steam leakage from the heating system will cause burns.

Is FUM tape used for sealing steam and water heating pipes? No, experienced plumbers seal such joints only with flax (tow) and sealant.

Metal-plastic for gas

Metal-plastic pipes can also be used for gas supply. The inside of pipes of this type is made of polyethylene, which is already familiar to us.

Due to the fact that metal-plastic pipes are supplied in coils, it becomes possible to lay a fairly long gas pipeline without using a large number of connections.

If the pipes still need to be connected, then only press fittings must be used. With their help, you can ensure the tightness of the connection, which will retain its properties for a long time. However, to make such a connection you will need a special device.

Winding tape onto pipe threads

This operation is always performed using an external thread. If repairs are made by replacing the fitting, the pipe threads must be thoroughly cleaned of dirt and rust, degreased using acetone or white spirit, and dried in air for about 10 - 12 minutes. How to use a pipe burner to ensure its effectiveness:

the seal must be wound onto the thread from its rear end;
the FUM tape is applied in the direction of its descent, that is, its end should be located in the direction of screwing on the fitting;
winding is carried out with tension, ensuring a tight fit of the pipe thread profile; it is better to allow the tape to break than to perform loose winding;

If there are no such notches, you need to do them yourself.

FUM tape for pipes is a modern and most commonly used means for sealing joints in pipelines for various purposes. FUM cord products that have appeared in recent years do not provide any special advantages either in application technology or in efficiency.

To understand how to use FUM tape for gas pipes, you need to take into account the characteristics of the material and apply it in the appropriate way.

Watch the video

Alternative materials – linen tow

Various seals are used, which include bast fibers in the form of strands and various sealants.

One of the first sealing materials to find widespread use in pipeline installation is tow. This is still the name given to flax fibers in the form of strands wound on the external thread of a pipe.

In this case, it is important to wind it carefully in turns, filling out the full cutting profile. For more reliable sealing, the winding of tow is covered with additional materials, from thickly rubbed paint to specially developed sealants

The advantages of sealing joints with plumbing tow are as follows:

the ability to adjust the interface at its location - it is possible to turn the fitting in the opposite direction at an angle of up to 45 degrees without losing its insulating properties;
sufficiently reliable tightness and ability to absorb moisture;
the joint is resistant to mechanical stress;
facilitated dismantling of the joint.

Disadvantages include the tendency to decompose as a result of putrefactive processes, since the material is an organic product.

Video

There is no clear answer to the question of choosing a method for sealing a threaded connection. The undoubted advantage of using tape is the connection of cantilever elements, such as taps or mixers; coupling connections of pipelines are best made with plumbing tow.

Sealants

Not only increases the impermeability of the connecting area, but also significantly increases its ability to withstand mechanical loads

Which is very important in pipeline systems due to constant vibration influences and water hammer

The sealant hardens upon contact with air or the mating surfaces of the threaded joint, acting as an adhesive and turning the assembly into a monolithic part.

The most common way of classification is by color and there are two main positions for this division:

blue – represents medium strength sealants. Can significantly reduce the intensity of the thread loosening process. In practice, even the slightest weakening of a joint will require prolonged exposure to serious loads of an alternating nature. But when using blue sealants, it is still possible to turn the thread, although with great difficulty;
When using red sealants, such an operation without heating does not seem realistic. This gel simply glues the structure together. For pipelines it is used in places with strong vibrations (from pumping equipment) and when water hammer is possible.

Conclusion

FUM tape for gas pipes is one of the main ways to seal joints during pipeline installation. The methods outlined here for how to use a paddle for gas pipes take into account all the main features of the material, but do not exclude the performer’s creative approach to this important operation. It is necessary to understand that the gas pipeline is a source of increased danger.

Video

What is needed for installation and connection

You will need:

gas stove for a summer house under a cylinder (configured for the use of liquefied gas);
gas cylinder;
gearbox;
hose for connecting a gas stove or copper pipes of suitable diameter.
2 clamps for attaching the hose (on one side - to the adapter for connecting the stove, on the other - to the reducer);
gas tap (not required, but recommended).

It’s already clear how to choose a gas stove; now we’ll figure out the rest of the components. Nothing complicated, but there are some peculiarities.

Cylinder material and size

First, let's talk about the material from which the liquefied gas cylinder is made. Until recently, there weren’t even such conversations. The gas cylinder was exclusively made of metal, and made of metal of decent thickness. Now there are also composite gas cylinders (also called Eurocylinders) and they are approved for use by gas services. If possible, it is better to buy just these. Why are they better? Here is a list of their advantages:

2 times lighter.
They have a fusible insert that prevents explosion in case of overheating/fire.
Allowed for transportation in regular cars.
Do not accumulate static voltage.
There are polymer cylinders with transparent inserts. They allow you to control both the degree of filling and the availability of gas.

The polymer cylinder has few disadvantages. The first is that it costs two to three times more than a metal one, but it is much easier to carry/transport. The second is that, with equal volume and dimensions, it is larger than its metal counterpart.

Now about the size of gas cylinders. The larger the volume of the gas cylinder, the longer the period between refills. But, on the other hand, larger volume cylinders have larger dimensions and weight, and are more difficult to carry/transport. In addition, it is easier to find a place for installation under a small cylinder.

In general, the choice is yours. Moreover, with the advent of composites, they appeared in different sizes - high and narrow, low and wide.

Gearbox

Why do you need a reducer on a gas cylinder? It performs several functions at once:

Stabilizes the pressure at the outlet of the cylinder. The gas in the cylinder is under high pressure; for a stove it should be lower. This is what the gearbox does.
When there is little gas left in the cylinder - 5-10% - the pressure reducer increases.

Prevents air from getting inside. When combined with oxygen, an explosive mixture is formed, so this function is also important.

There are models that work as a pressure relief valve. If the specified parameters are exceeded, part of the gas is released until the parameters normalize.

So the reducer on the gas cylinder helps improve safety and stabilizes the operation of the stove. It is better not to connect the stove without it. In this case, the more you open the tap on the stove, the more powerful the gas flow will come out. In addition to the fact that this is uneconomical, it can create a situation where the balloon starts to jump. In general, it is better not to operate it without a gearbox.

Please note that different types of reducers are used for metal and composite cylinders. Therefore, when purchasing, check the type of cylinder and its volume

And most importantly, to work with a liquefied gas cylinder you need a propane reducer.

Beware of gearboxes made in China....

If we talk about manufacturers, it is better to take Russian or European products. It's better to avoid the Chinese ones. Even those that have passed certification are made of very thin metal and quickly fail (begin to etch). In addition, many cannot withstand the size of the fittings. When connecting, this becomes a problem, since the hose is not put on tightly, and you have to somehow seal the connection.

Hose for gas stove

You can buy it in city gas stores or in construction stores/markets. But be sure to specify that you need it to connect a gas stove. It is correctly called a “gas hose”. The internal diameter should be 16 mm, the external diameter depends on the type of hose, and there should be an inscription on the surface (in yellow) stating that the hose is gas.

There are such gas hoses:

To connect the cylinder to a gas stove, you need a hose about a meter long - to fulfill the condition about the distance between the cylinder and the stove of 0.5 meters and leave some room for freedom of movement.

On one side, a union nut with a gasket should be installed on the hose. We connect this end to the outlet from the gas stove. If you just buy a piece of hose, you can install the corresponding gas adapter yourself by tightening the fastening with a metal clamp (don’t forget about the thick silicone gasket for sealing). On the other hand, the hose is connected to the reducer - it is pulled onto the fitting, then tightened with a clamp (do not forget to put the clamp on the hose and then connect it to the fitting).

Fighting the leak

Fixing a heating system leak using a sealant is a chemical fight against leaks.

The specified German sealant proved to be excellent in solving this dilemma. The following tools are also used:

Resins with two components based on epoxy.
Adhesive silicone compounds.
Heat-resistant compounds based on rubber.

Their algorithm:

The damaged area is degreased, dried, and covered with a thin layer of sealant.
Next, it is wrapped with serpyanka. Serpyanka reinforces the sealed layer.
The serpyanka is already covered with sealant. The action is repeated.

If a silicone product is used, then you do not need to use abrasives to grind the damaged area. And this type of sealant adheres better to a smooth surface.

Applications and functions of dielectric inserts

The absence of a dielectric insert can lead to a spark and gas detonation.
The gas dielectric coupling is a mandatory element, the presence of which is provided for by the rules governing the construction of gas distribution systems SP 42-101-2003. It must be present in pipelines of any type, including options with polyethylene pipes. If there is no such coupling, the stove, column or other electrical appliances can fail at any time after the appearance of stray current or become its cause. Sparks may occur inside the pipeline and cause a fire. Cases of spontaneous ignition of wiring occur quite often and can cause a major accident.

The process of detonation of the gas-air mixture may well destroy a multi-story building when the fire is not detected in time. When stray current appears inside pipes due to an emergency or during a thunderstorm, the risk of serious injury to owners of electrical appliances increases significantly. A dielectric coupling for each gas pipe must be installed in any building or apartment where gas-powered appliances connected to electricity are operated. In addition to its main functions, it prevents the formation of stray currents that arise due to problems during the installation of boilers, water heaters or gas stoves.

Welding of gas pipelines

Welding of gas pipes under pressure is carried out by highly qualified welders who have certificates for such work.

Manual arc welding and flash contact welding do not provide reliable corrosion resistance of the joint area

, only the pressure welding method eliminates these disadvantages.

Welding in a special welding installation occurs in this way: - the pipe is fed along the roller channels until it stops at the stopper of the immovable clamp and the pipe is clamped there. The supply of the second pipe is carried out until it stops at the first pipe, then the movable clamp is clamped; — a special mechanism regulates the difference between the edges and pre-pressure is created at the joint through a movable mechanism; — by longitudinal and transverse movement of the heating unit supports, the inductor is first adjusted to the junction and then closed; - turn on the induction heating source, and when the welding temperature is reached, the temporary relay will turn off the heating source; — the time allocated for welding one joint is no more than one minute; — a command is given for the upsetting of the welded pipes; after upsetting, the clamping devices are unclenched, the movable clamp returns to its initial position and the installation is ready to accept a new pipe.

This welding method is used in the gas industry to join ferrous pipes and pipes with an internal anti-corrosion coating.

Polymer connection models

In the case where it is necessary to conduct a drainage section underground, metal structures will not be able to last for a long time. Polymer components are used to lay the wire in the ground.

This material is not subject to corrosion, and pipes made from it remain in perfect condition for many decades. In addition, such bends are able to withstand the highest pressure; they are made monolithic, that is, without seams, and are easy to cut, and the connecting elements can be fastened together with a simple soldering iron.

Connecting parts to such lines must meet all requirements for strength and tightness. Therefore, it is not recommended to install polyethylene fittings for gas pipes. Neither compression nor press models can provide a high-quality connection due to their susceptibility to mechanical damage. Even the use of complete insulation taking into account all safety measures does not provide guaranteed protection from external influences.

Also, it is strictly forbidden to install PE fittings for gas on glue or with rubber parts. The tightness of such connections leaves much to be desired.

The best option in this case are:

special fittings for HDPE communications, made of brass. Such parts have increased strength and can provide the necessary tightness;
Welded bends are ideal for polymer products. Low-temperature soldering devices are used for their installation;
electric welded fittings equipped with self-melting spirals. These are the most expensive elements, but they are also the most reliable.

Connecting pipes with fittings

Requirements for gas sealants

To completely eliminate gas leakage at the connecting points of the gas pipeline system, it is necessary that the winding meet the following requirements:

resistance to vibrations of varying intensity;
resistance to sudden changes in temperature and internal pressure;
protection of the connection from the formation of corrosive deposits;
ease of installation and dismantling in case of repairs;
durability and long period of use.

All sealing materials must be tested by specialists for strength and certified for use in gas supply systems.

Standards for construction and installation work when creating a home gas network

The presence of a project for individual housing construction is not required, as it is stated in the Town Planning Code, and in PP No. 1314 it is stated that the GRO can only “check the gas consumption network installed by the applicant during the activities carried out by the contractor for connection before the actual start-up of gas.” That is, it is recommended to have a project, as in any construction, but not necessary; and even more so, its absence cannot be a reason for refusal of acceptance. As for the installation work itself, there is an updated version of SNiP 42-01-2002 - SP 62.13330.2011 with changes No. 1 and No. 2, “Gas distribution systems”.

In order not to copy a huge amount of information, there are a number of basic rules that must be strictly observed:

The fewer seams and connections there are, the more reliable the system; it is advisable to immediately select pipes of sufficient length. Even without a project, it is not so difficult to sketch out a wiring diagram in a program or graphically and calculate the required segments.

Types and conditions of sealing

It is necessary to insulate joints when laying pipes for different types of pipelines. The only exception is welded joints, but this is their disadvantage - they are permanent. And joints using threads make it easy to replace a damaged area or insert a new harness.

Therefore, sealing is necessary for threaded pipe connections:

hot and cold water supply,
gas pipelines,
heating.

In practice, threads are used in small-diameter pipelines - in internal wiring of houses and apartments, country cottages and when laying networks to detached buildings with low water and gas consumption. For large diameter water supply and heating pipes, flange connections and welding are used.

Ventilation lines, as a rule, have a large cross-section and are made of thin-walled sheets or corrugated pipes. Therefore, threaded connections are not used in them, but sealing the joints is still necessary.

When choosing a method for sealing pipe connections, it is necessary to take into account their properties and the conditions in which they will function:

External temperature of the medium and internal temperature of the medium in the pipeline. Some types of sealants lose their properties at elevated temperatures or frost.
Line pressure. Liquid insulators can be squeezed out of the connection under high pressure.
Pipe diameter.
The final strength of the connection. This is the force required to disassemble an insulated joint in case of repair or reassembly.
Environmental Safety. When laying pipelines for drinking water, do not use substances that can release toxic compounds.

Most of the means and substances used for sealing, according to these parameters, fall within the range required for joining household pipelines. But a particularly careful choice is necessary when sealing gas pipe joints. Loss of tightness in water lines is noticeable from the very beginning by traces of leaks at the joints. Gas leaks are not visible and may remain undetected for a long time.

Help. The gas worker rejected the wiring. What's wrong and what should be done?

03/04/2010 at 00:39

nvs wrote: oh there is a diagram like this: pipe -> threaded inlet valve -> tee -> from the tee there are two taps -> from each tap there is a bellows connection to the devices.

Only welding. No tees. The gasman is absolutely right.

03/04/2010 at 00:43

AlexMax wrote: Only welding. No tees. The gas man is absolutely right

Thanks for the quick response. Ok. But as far as I know, the taps there are made of brass, they do not boil. What, do you need to look for some steel cranes? Please clarify, I’ve already lost my head.

03/04/2010 at 00:59

You may need to have a gas filter; the inlet valve may not require a ball valve. We need a project here. The taps, of course, are not running.

03/04/2010 at 01:03

Remove the tee and weld the elbow to the pipe (up to the tap). Screw the second tap onto it.

03/04/2010 at 01:03

AlexMax wrote: We need a project here. The taps, of course, are not running.

The gas worker said roughly the same thing. Moreover, he promised to do everything without projects and documents, but according to all the rules, literally the day after tomorrow. I need to decide before lunch tomorrow, send it and look for other options or agree. Time is also against me, now only the stove is directly connected, there is no hot water.

03/04/2010 at 01:05

Vitaly S wrote: Remove the tee, weld a bend to the pipe (to the tap). Screw the second tap onto it.

That is, there will be no common inlet tap? By the way, is it needed? It seems that it was required before, but was recently canceled? I heard it out of the corner of my ear.

03/04/2010 at 01:10

I have never had a gas filter and have never heard of anyone in this house having one.

03/04/2010 at 01:34

as correctly written in SNiP-e SNiP 42-01-2002

7.3 Internal gas pipelines should be made of metal pipes. Connection to gas pipelines of household gas appliances, instrumentation, LPG cylinders, gas burners of portable and mobile gas-using equipment may be provided with flexible hoses that are resistant to the transported gas at a given pressure and temperature. 7.4 Pipe connections must be permanent. Detachable connections are allowed to be provided at the points of connection of gas and gas-using equipment, fittings and instrumentation, as well as on gas pipelines and gas-using equipment, if this is provided for in the manufacturer’s documentation. .

7.9 The installation of disconnecting devices should be provided: in front of gas meters (if a disconnecting device at the input cannot be used to disconnect the meter); in front of household gas appliances, stoves, cooking boilers, heating stoves, gas equipment and instrumentation; in front of burners and igniters of gas-using equipment; on purge gas pipelines; at the entrance of a gas pipeline into a room when a GRU or gas meter with a disconnecting device is placed in it at a distance of more than 10 m from the entry point. The installation of disconnecting devices in hidden and transit sections of the gas pipeline is prohibited.

Features of installing an exhaust pipe for gas appliances

When installing gas heating appliances, as well as oil radiators, it is necessary to pay due attention to the issue of competent organization of the removal of combustion products from the premises. And this is correct, because, in addition to creating a safe environment for people, they increase the efficiency of the heating devices themselves, contributing to their more productive and economical operation

To determine the diameter of the gas outlet channel, it is necessary to take into account:

Amount of combustion products.
Power of heating devices.
Temperature difference between outside air and combustion products.
The height of the chimney pipe.

Installation of exhaust pipes for gas appliances, in accordance with the rules, is carried out next to internal walls and near partitions made of non-combustible materials. If necessary, it is also permitted to install them in external walls, also from non-combustible materials. In this case, in order to avoid the appearance of condensation when removing combustion products, the walls on the outside are insulated. If there is no wall in the room that is suitable for placing exhaust pipes in it, you need to use a root or attachment pipe for a gas appliance.

It is necessary to ensure maximum open access to the pipes.

Installation of gas appliances that do not have a connection to the chimney duct is carried out exclusively in a place where at least 5 m3 of free space will be allocated for each burner. A small water heater that is not equipped with exhaust gas combustion products must be allocated at least 6 m3. A gas water heater for a shower room or bathroom must have an exhaust hood for gas combustion products and a free space of at least 10 m3.

If the room where the gas stove is being installed does not have the required volume, then a ventilation outlet must be made above it. Since gas appliances use air from the room for combustion, it must be freely available. For this purpose, a small gap is left under the floor door (the area of the gap is calculated from the calculation: for every 1000 kcal/h of gas appliance power, at least 10 cm2 is required).

All heating devices, geysers, etc. are equipped with a fuse to shut off the gas if the fire goes out.

Installation of gas heating devices must always be carried out with a connection to the chimney in all cases except one: if it is a heater with a closed combustion chamber. Then the exhaust of combustion products and the air supply to the burner are separated from the room. A chimney with a cross-sectional area of 200-220 cm2 can be connected to a pair of gas appliances on one floor with a gas flow rate of 8 m3/hour. The height distance between the inlets into the chimney must be at least 30 cm. To connect four gas appliances from one apartment with a gas flow rate of 12 m3/h, on one floor you need a chimney with a cross-sectional area of at least 300 cm2. Connecting gas appliances to the same chimney on different floors is unacceptable.

The chimneys of gas appliances are located above the roof in the same way as conventional chimneys. When, during the reconstruction of a house, it is impossible to use the old chimney to remove gas combustion products from the stove, a new chimney is made from pipes that are connected to the rear facade of the house. These pipes are made of galvanized steel sheets, and, unlike pipes for removing combustion products of liquid and solid fuels, they are connected by joints that are directed in the opposite direction from the movement of gases.

During repairs or reconstruction, when the tightness of gas pipes may be compromised, it is necessary to check their integrity upon completion of the work. For this purpose, air is introduced into the pipes at a pressure that is twice the pressure that is necessary in them when gas passes through (approximately 500 mm of water column).

Before checking, you need to close the taps. If within five minutes the pressure in the pipes drops by more than 20 mm of water. Art., then you need to look for damage in the pipe (the suspected places of damage need to be moistened with soapy water). The gas pipeline for liquid gas is checked for leaks in the same way under a pressure of 1200 mm water. Art.

Threaded connections are applied to pipes, as well as connecting and branch fittings. But the simplicity and reliability of connecting any pipelines using threading still does not ensure its complete impermeability. Therefore, a mandatory addition is to seal the pipes at all points of threaded joints. Only this combination allows you to create a reliable connection.

Rules for installing ventilation equipment

Optimal performance of the device depends on the following factors and installation rules:

The size of the ventilation device must correspond to the dimensions of the hob. Then all the hot, contaminated air flow will be completely sucked in by the hood and discharged outside, or cleaned through a filter and fed back into the kitchen. The standard dimensions of the device range from 60 to 90 cm.
Properly installed hood above the stove. The distance from the appliance to the stove should not contradict fire safety standards and depends on the type of stove. The required distance from the stove to the hood is always indicated in the technical data sheet of the device.
Connecting the device to the network.
Installation of air exhaust pipes, if required by the design of the exhaust hood.

It is better to entrust the installation of ventilation equipment to professionals. But for those who are confident in their abilities, it will not be difficult to hang the device with their own hands.

Installing a hood with a circulation type of operation is not difficult. First you need to measure its height and mark it with control points. Then you should drill holes in the wall for the fasteners. Next, the device is mounted to the wall or to wall cabinets using self-tapping screws and special hooks included in the kit.

Hoods of another type of air purification are installed in the same way as circulation hoods. Only here you need to attach the air duct pipe to the umbrella body. The pipe can be plastic or foil.

Upon completion of installation of the equipment, it is necessary to carry out a control check of its operation (mainly for the second type of model). If the hood does not function or is too noisy, you should once again check all the connections between the device and the ventilation pipes and their integrity.

Natural sealants

Jute and tow are used in conjunction with silicone sanitary sealants. The thread is cleaned of dirt and rust, coated with sealant, the sealant is twisted into a thread and wound clockwise flush with the thread crest. When winding, the seal is pulled with a force of 0.5-1 kg.

After winding, carefully coat with sealant and assemble the connection. Within 5-8 minutes, until the polymerization process is completed, it is necessary to check and, if necessary, tighten the connection further. Tightening the nut after the sealant has polymerized will cause leakage.

Stores sell ready-made plumbing thread for sealing pipes, made from flax. It doesn't need to be twisted. Before you buy a thread, read on the packaging what it is made of and whether it contains silicone or acrylic sealants. If it is a fluoroplastic thread, it is not advisable to use it on damaged threaded connections; if it is a vegetable thread without sealant, then purchase sanitary sealant separately.

Owners of apartments and houses ask: “Which thread is best for pipes?”, meaning the brand. To which a professional plumber will answer: “Better is the thread that was skillfully wound.”

If there is more or less thread than required, or it is not wound along the threads, the connection will leak. Do not wind it “with reserve”, wind it as much as necessary and do not forget about the sealant.

Selection criteria and features of gas fitting models

Of the variety of connecting connections available in the range, only certain types that meet the required parameters are suitable for safe wiring of gas communications.

Steel fittings and pipes

Products made from high-strength steel have always been famous for their quality. To supply household communications, it is possible to use several types of connecting elements. Complete tightness is ensured by seamless rolled joints and pipes welded using both cold and hot methods.

Metal fittings for gas pipeline

Steel bends are laid to residential buildings by ground method. To protect against harmful external influences, the surface is double coated with primer and paint.

Butt fasteners for such lines are made of cast iron, steel or brass. By design, only two types are suitable, these are:

threaded (detachable),
welded (monolithic).

Fitting models designed for permanent joining are installed along the main gas supply line. Installation features include the formation of an even and smooth circular seam using the electric arc method or gas soldering.

The branches going to the meter and devices are fastened only with detachable threaded fittings. The tightness of the joints is ensured by the heat-resistant polymer material FUM. This type of tape fits easily onto the squeegee, but can be damaged by the counterclockwise movement of the coupling, which will lead to leakage. Therefore, installation of gas fittings using FUM tape requires experience and skills.

Types of sealing tapes

This material is produced in the form of winding on a reel up to 10 meters long. Successfully used for winding onto pipe threads in pressure systems, including water, gas and heating systems.

Its purpose in connections is a deformable filler that acts as a thread lubricant, helping to increase tightness. This seal is available in 3 types:

type 1 – for use in pipeline systems for transporting aggressive liquids, used using purified petroleum jelly;
type 2 – for pumping strong oxidizing agents, which prohibits the use of additional sealant in the form of oils;
type 3 – used for transporting relatively pure liquids and gases; the use of lubricants is excluded.

Flexible gas supply - installation rules

It is not recommended to connect the gas stove yourself. The gas is explosive and the slightest leak can lead to irreversible disaster. Soap solutions, which amateurs used to check for leaks in the past and now, have long been out of date.

Each gas technician who connects the stove to the gas pipeline has highly sensitive electronic gas detectors. If it is still not possible to call a specialist to connect gas-consuming devices to the main line and the work is carried out with your own hands, you should follow the following rules:

To connect gas stoves, special flexible connections with a yellow stripe are used. Rubber and polyvinyl chloride products must have a tag indicating the manufacturer and date of manufacture.
The permissible length of the hose should not exceed 4 m. If the distance is too large, a metal pipeline of the required length is welded to the main line, to which the liner is then screwed.
The hose must be solid; it must not be laid from two joined sections of any type of connection.
The flexible gas connection purchased must be of such length that it can be positioned in a free-hanging position without tension.
When installing the stove, free access to the hose must be ensured. This is necessary for visual inspection of it for possible damage and cracking.
Some users are not happy with the appearance of black rubber or yellow eyeliners and try to take steps to change their color. Under no circumstances should the sleeve be painted, only covering it with various films is permissible.
When installing metal bellows connections, it is necessary to take measures to electrically isolate them from the plate (connection via a dielectric coupling). Otherwise, stray currents may damage the corrugated casing, causing dangerous leakage.

Sealing threads with thread.

For those who are too lazy to twist flax into strands and then smear it with paste, they came up with a sealing thread. The thread can be made from different materials:

Polyamide - designed for a pressure of 16 atmospheres on water and 8 atmospheres on gas, has an upper temperature threshold of 130° C.
Fluoroplastic - has characteristics identical to FUM tape, but usually costs more.

Manufacturers lubricate the thread with a special lubricant, the composition of which they do not disclose. In my opinion, fluoroplastic thread is better in quality and I recommend it to you, despite the fact that it is more expensive than polyamide thread. If you want to learn how to wind thread correctly, watch the following video:

Everything is in stock

2 minutes - on average, this is how much it takes to process an order placed on the website

Dielectric insert (insulating insert, dielectric insert for gas)

A dielectric insert is a device that prevents the spread of so-called leakage currents (stray currents) through intra-apartment or intra-house gas pipelines. The dielectric insert not only eliminates possible heating and sparking of the liner in the event of accumulation of electrical potential, but also protects the electronics and internal electrical circuits of gas appliances and meters from failure due to exposure to harmful stray currents.

The main causes of leakage currents include the following:

– Damage to the general insulator at the entrance of the main pipe to an apartment building or the insulator at the exit of the gas distribution point (node). To protect against corrosion, a small electrical potential is specially applied to the main pipes. In the event of damage to the common insulator, this potential freely enters the intra-house and intra-apartment gas pipelines. – Faulty or ungrounded electrical wiring in the house. Modern gas-consuming equipment has its own electrical circuits (electronic control units, electric ignition systems, lighting, etc.), and in the absence of electrical grounding, as well as in the event of a malfunction of the internal electrical circuits of gas-consuming equipment, these devices themselves become sources of stray currents. – Unqualified connection of electrical appliances and their illegal grounding by your neighbors (or the “craftsmen” hired by them) to hard gas pipes and risers.

The dielectric insert is a permanent connection and is installed between the gas tap and the gas supply. The metal parts of the insert, fused into the dielectric, do not touch each other, which makes it impossible for leakage currents to pass through it (the insert). The insulating insert has an internal surface completely covered with a dielectric, which prevents contact of each of the metal parts of the insert with the gas passing inside the insulator.

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Portable stoves with the ability to connect to different gas cylinders

The M series stoves can run on all liquid fuels, making them extremely convenient for any situation, not just as universal camping equipment. Tiles in this series will work not only on gas. Kerosene, gasoline, diesel fuel - any available fuel. Liquid fuel allows you not to be left without heat and hot food even in the most extreme conditions. The presence of a gas generator (a special tube in which liquid fuel turns into a gaseous state) turns the tiles of this series into the most popular product.

The H series involves the use of a gas outlet hose; in addition, some models are equipped with fuel heating, which increases the power of the stove itself and the range of its use.

Small stoves of the S series with Screw Type valve are used as portable stoves, lightweight, compact, optimal for saving space in a backpack. They are used with PF-FG-230 and PF-FG-450 cylinders; they just need to be screwed all the way onto the gas container. The stove rests directly on the gas cartridge itself, so you won’t be able to cook a large volume; the total load on the cartridge should not exceed 5 kg.

In addition, tabletop stoves are offered with the ability to connect to household cylinders. These tiles have a completely civilized appearance and can be used both on hikes and in the kitchen. They usually have 1-2 burners, they weigh little, are conveniently packaged, and piezo ignition eliminates another minor concern.

“Pathfinder” PoweR PF-GST-M01, a single-burner stove with the ability to connect to a large cylinder and a small collet, has an analogue with expanded capabilities, a real masterpiece from MaximuM PF-GST-DM01, which is equally comfortable to use on a hike and stationary in the countryside . Neat appearance, two burners. You can install small collet containers (one for each burner) and power the tiles from ordinary volumetric valve cylinders. For the second option, an adapter designed specifically for this purpose is suitable for both plates.

Types of dielectric inserts for gas

The dielectric for a gas hose, according to the product range of elements for gas distribution devices, is divided into two standard categories. These are insulating taps, couplings, barrels or bends, as well as standard bushings. The choice of a specific type depends on the installation conditions and the characteristics of a particular system.

Insulating couplings

Insulating coupling made of dielectric material
Couplings are divided into three categories, which differ from each other mainly by their threaded diameter; its value can be 15, 20 or 25 mm. Separation according to this criterion makes it possible to install inserts in any pipelines, since the Russian gas pipeline system does not use diameters smaller than 1/2 and larger than 1/4. Subtypes of inserts, so-called barrels, can have external threads on both elements or internal and external threads on each.

Dielectric bushings

Such inserts are liners that prevent the passage of electric current. They are placed between gas pipes and wiring, the diameter of such elements ranges from 8-27 mm, both sides are threaded from the inside. Bushings are not inferior to couplings in terms of resistance and strength; parts can withstand pressure up to 493 atmospheres.