Dielectric gas insert how to install correctly. Why do you need a dielectric gas clutch and how to install it? How a breakdown occurs on a gas network
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Dielectric insert (or - non-detachable connection that prevents the propagation of leakage currents. The dielectric insert also protects electronic components (for example, control units) and electrical circuits (for example, an electric ignition system, backlighting) of gas-consuming equipment from the harmful effects of stray currents. The insert is installed between the gas cock and the gas supply. Of course, the gas meter can also suffer from stray currents. And, importantly, the insulating insert excludes possible heating and even sparking of the metal gas supply line as a result of the accumulation of electric potential on it.
There are several reasons for the occurrence of stray currents, or leakage currents. The main ones are:
- Damage to the insulator on the gas main. To prevent corrosion, a small electrical potential is specially supplied to the steel pipes of the main gas pipelines, which must be extinguished at the entrance to an apartment building or at the exit from a gas distribution unit in the immediate vicinity of a branch to an individual house. For these purposes, a special dielectric trunk insert is used. In case of its destruction or absence, the electric potential freely penetrates into the intra-house and intra-apartment gas pipelines.
-Lack of electrical grounding, wiring failure and 
local electrical circuits. Modern appliances that consume gas (gas boilers and water heaters, stoves, ovens, etc.) are often crammed with electronics and local electrical circuits. These are electronic control modules, and electric ignition, and timers, and backlight systems, etc. In the absence of the necessary electrical grounding, as well as when electricity hits the metal body of the equipment due to a malfunction of local electrical circuits (the so-called breakdown to ground), such equipment itself becomes a source of harmful currents.
- Illegal grounding of electrical appliances on gas steel pipes. Often your neighbors, who have entrusted the work of connecting certain electrical appliances to "craftsmen", are happily ignorant of the fact of grounding their (neighbor's) electrical appliances to a gas pipe.
SPECIFICATIONS:
Connecting dimensions insulating inserts: 1/2", 3/4";
Execution option: fitting-fitting;
Material of metal parts: brass CW614N according to EN12165, analogue of sanitary brass LS59-1 according to GOST 15527;
Dielectric: Polyamide in accordance with GOST 14202-69 with a category of resistance to combustion PV-0 in accordance with GOST 28157-89;
Nominal pressure PN \u003d 6 Bar (or about 6 atm). For reference: according to SNIP 2.04.08-87, gas pressure up to 0.03 atm is considered normal in intra-house and intra-apartment gas pipelines;
Pressure unit conversion table is available on our website.
Electrical resistance: more than 5 megohm at U \u003d 1000V;
Operating temperature range: -60 to +100 deg. Celsius.
The use of an insulating insert is regulated by the Letter of Mosgaz No. 01-21 / 425 dated 26.12.2008: "... When connecting gas stoves to a flexible hose, provide a dielectric insert."
Dielectric insert:
In order for the stray electric current generated in the gas pipeline not to damage the gas appliances installed in our houses and apartments, special dielectric inserts or gas couplings are used, which are installed between the gas pipe and the gas pipe. What is a "wandering current", why does it arise, why is it dangerous and how to protect gas appliances from it?
Stray current appears in the ground when power transmission lines fail, it can occur due to an accident on an electric railway or tramway, in an emergency state of power lines.
The difference between the resistivity of the earth and the steel structures of gas lines is so great that the current does not go into the ground, but into these very metal structures. Due to the fact that both domestic and main pipelines are made of metal, the stray current flows directly into our gas system.
The stray current suddenly appears when the installation is incorrect, the boiler or the column is connected to electricity. It turns out that the wandering current is a real serious problem for the safety of not only one single apartment, but also an entire multi-storey building.
Insulating keg and squeegee
The use of dielectric gas inserts: what are they for and their functions
1. As a result of the effect of the stray current, your gas appliances may lose their functionality or become sources of stray current themselves.
2. If a stray current has arisen in the pipeline, during a thunderstorm or an emergency on the power line, a person can get serious injury with the most serious consequences.
3. As a result of a stray current, a spark may appear in the gas pipeline, which causes a real threat of fire, and when a gas mixture explodes, not only one apartment, but a whole multi-storey building can fly up into the air.
A dielectric insert is far from someone's whim, it is a duty to install for someone who has gas equipment in his home or apartment connected to electricity.
That is why, when laying the gas distribution pipe, the contractor must be guided by a set of rules (SP 42-101-2003, paragraph 6.4), which refers to the mandatory installation of dielectrics, even if the pipeline is not made of metal, but, say, of polyethylene.
Types of dielectric gas inserts
Dielectric gas inserts are manufactured by our industry in several versions. They are usually divided into two main types:
1) insulating couplings, barrels, driveshafts, taps;
2) dielectric bushings.
Dielectric gas coupling
Couplings are devices that have internal threads at the end. The couplings are installed between the gas appliance and the gas pipe.
Dielectric couplings are conventionally divided into 3 main types, differing from each other only in the thread diameter:
- ⌀ 15 mm or 1/2 ′;
- ⌀ 20 mm or 3/4 ′;
- ⌀ 25 mm or 1 ′.
This division by thread size allows you to install couplings with absolute precision on any pipeline system, since thread diameters less than 1/2 'and more than 1 1/4' are not used in our gas pipeline system. Dielectric couplings are not only desirable, they are required when installing hoses for gas appliances.
Valve with insulating sleeve
Dielectric couplings can be classified not only by thread size, but also by the way they are connected:
1. Barrel ("nipple-nipple"): both ends have an external thread.
2. Barrel ("nut-union"): one end has an internal thread, the other - an external thread.
3. Coupling ("nut-nut"): both sides with an internal thread.
Unlike a clutch, a bushing is a liner that does not allow electrical current to pass through. Installed between the gas pipe and the pipe. The sleeves differ from each other only in their size, that is, the size of the diameter of the insert. It is common to use sleeves with a diameter of 8 to 27 mm.
Dielectric bushing for gas
With all the differences, both couplings and bushings have such common characteristics as:
- are made of non-combustible material, polyamide, which has a very high level of resistance up to 5 million ohms;
- have approximately the same strength index: the working pressure of both couplings and bushings is 6 atmospheres, and the maximum withstand is about 493 atmospheres.
How to install the dielectric insert correctly
Both the coupling and the bushing are installed between the gas pipe and the hose. If you install the dielectric yourself, pay attention to the order and sequence of your manipulations.
1. Shut off the gas in the pipe through which it is supplied to the gas appliance.
2. for the gas in the supply line to burn out to "zero", you need to leave the burners on the gas appliances open.
3. Prepare two adjustable wrenches.
4. With the first wrench, hold the tap on the pipe, and with the second, unscrew the nut of the flexible hose (two adjustable wrenches are required to prevent gas flowing out).
5. Screw the nut of the hose, through which the gas flows from the pipe to the gas appliance, to the end of the coupling.
6. Test your work for leaks by applying soapy water to the joint with a shaving brush.
Open the valve, make sure there are no bubbles at the joints, if not, then your work is done correctly.
Correct installation of the dielectric gas insert
Dielectrics are presented on our market in a large assortment and in various price categories. Here you can buy a product that suits you in terms of quality for just a hundred rubles, or you can pay a few thousand for foreign-made products. So there is a choice, as they say, for every taste and budget.
Manufacturers and prices
To feel the difference in price, let's compare just a few dielectrics of domestic and foreign production. The Tuboflex trademark (a Turkish brand that has been transferred to the Russian campaign) is in good demand now:
- sleeve, gas connection (thread-thread) "TuboFlex", price 159 rubles;
- bushing, nut-fitting connection, "TuboFlex" ⌀ 20 mm, price 146 rubles;
- coupling "Lavita" HP 20mm, thread ⌀ 3/4 ', price 250 rubles;
- split clutch "Viega Sanpres 2267-22X1", price 3075 rubles;
- split clutch "Viega G3 Sanpres 2267-20X1", price 4033 rubles.
Today we have disassembled dielectric inserts (couplings, bushings), application, why they are needed, their characteristics and prices. Considered the types of dielectrics and the differences between insulating threaded connections. Watching the video.
Dielectric insert (insulating insert, dielectric insert for gas) -
This is a device that prevents the propagation of so-called leakage currents (stray currents) through indoor or indoor gas pipelines. The dielectric insert not only excludes possible heating and arcing of the supply line in the event of an 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 are:
- Damage to the common insulator at the inlet of a main pipe to an apartment building or an insulator at the outlet of a gas distribution point (node). To protect against corrosion, a small electrical potential is specially supplied to the main pipes. In the event of damage to the common insulator, this potential easily enters the intra-house and intra-apartment gas pipeline.
- Malfunction or lack of grounding 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 electrical appliances and their illegal grounding your neighbors (or hired by them "craftsmen") on rigid gas pipes and risers.
Dielectric insert is a one-piece connection and is installed between the gas valve and the gas supply. The metal parts of the insert fused into the dielectric do not come into contact with each other, which makes it impossible for leakage currents to pass through it (insert). Insulating insert has an inner surface completely covered with a dielectric, which excludes contact of each of the metal parts of the insert with the gas passing inside the insulator.
Materials used:
- Metal parts: Plumbing brass LS59-1 in accordance with GOST 15527;
- Electrical insulator: Polyamide in accordance with GOST 14202-69 with a category of resistance to combustion PV-O in accordance with GOST 28157-89.
Specifications:
- Nominal pressure PN 0.6 MPa, which is 200 times higher than the normal gas pressure in domestic gas networks (according to SNIP 2.04.08-87 and 
3.05.02-88, gas pressure up to 0.03 atm is considered normal);
- Working temperature: from -60 to +100 degrees Celsius, which makes it possible to install the insert in unheated rooms;
- Pipe thread, 1/2 "or 3/4";
- Inner passage diameter: 10.0 mm (for 1/2 ") and 14.5 mm (for 3/4")
- Electrical resistance at a voltage of 1000V over 5 MΩ;
- The insert does not require maintenance during operation.
Employees of gas services in some regions are already using a dielectric insert on a mandatory basis in intra-apartment and intra-house gas pipelines. In particular, its use is regulated by the order of MOSGAZ dated 26.12.2008. No. 01-21 / 425: "When replacing gas stoves and connecting them to a flexible hose, provide a dielectric insert."
"Small spool, but expensive" - \u200b\u200bthis expression is the best fit for dielectric insertion. The cost of this product is negligible even in comparison with the cost of the possible repair of electronic and electrical components of modern gas equipment, not to mention the consequences of emergencies such as fire or explosion.
Dielectric gas clutch provides safety in living spaces and saves life for people.
Natural gas-fired equipment is connected to power sources. To avoid an accident when an electric current enters the gas supply network, a protective insert should be mounted on gas appliances.
Purpose of the dielectric clutch for gas
Boilers and boilers are used to heat the water in the heating system. For cooking in the kitchen, they put stoves, ovens and hobs. The listed devices contain a system of control sensors, electric ignition, oven lighting. Therefore, the gas type of the device requires connection to the electrical network.
So that the current does not flow through the gas pipe inside the room, polyamide insulators are used - couplings. For the dielectric clutch for gas, yellow polyamide is used due to the low content of conductive impurities.
Dielectric insulating inserts, when current enters the gas network, will maintain the operability of gas devices and gas meters.
How a breakdown occurs on a gas network
Natural gas is supplied to homes and other premises through metal pipes laid underground in urban environments or above the surface in the private sector. Metal corrodes when exposed to moisture. The supply of a positive electrical potential helps to reduce corrosion.
According to safety rules, a dielectric coupling is installed on the pipe at the entrance to the house. This protects the gas riser inside the room, provided that the coupling is installed correctly and in good working order. But the dead grounding of the pipe in the basement of the house can break off due to corrosion.
Further, in a house or apartment, suppose the stove is connected to the riser through a rubber hose with a metal braid. If suddenly the insulation of the electric wire in the stove is broken, the current will go through the braid of the hose. Depending on the strength of the current, the heating and breakdown time of the hose will be small or long, but a breakdown will certainly happen.
Sometimes the residents of the house arrange grounding on a gas pipe.
Fire may occur if gas leaks in the apartment. Everything can do without sacrifices, but with material losses. After such an event, the question of why a dielectric clutch for gas is needed will no longer be hypothetical for the residents.
How the clutch works
Parts of the gas network are produced in several types according to the type of fastening: "union - union", "nut - union". The product is one-piece, non-separable, therefore it is safe to use. Any excess connection is a source of gas leakage.
Quality couplings are made of brass, the tube thickness is at least 4.5 millimeters. The insulating part is made of yellow polyamide with a flame retardant included.
Choice of liners and couplings
It is better to choose a bellows liner with a yellow insulator coating. It is easier for housewives to wash such eyeliner from dust and kitchen soot. At the same time, the insulator protects against current flow when touching the bare terminals of live devices or the conductive housing of the device.
Of course an inexpensive rubber hose could be supplied. But rubber tends to age, lose elasticity, microcracks appear on the rubber hose - places of gas leakage.
Dielectric gas couplings will protect against current flow through any hose. These parts are tested for breakdown current with a frequency of 50 Hertz and a voltage of 3.75 kV for 6 seconds or more. When a voltage of one kilovolt is applied, the electrical resistance is 5 megohm. The inserts can withstand temperature differences from -60 to +100 degrees. The insulator manufacturers guarantee a service life of at least 20 years.
Having installed a dielectric clutch for gas, leaving the house on business or taking a bath, the reader will be confident in the safety of his home, loved ones and neighbors. Dielectric insulator - protection against line burnout, subsequent gas leakage and inevitable explosion.
