Gas dielectric coupling. Dielectric clutch for gas. Safety. Wandering current - where he is taken in the gas pipeline

Insert dielectric (or -Nexual connection that prevents the proliferation of leakage currents. The dielectric insert also protects the electronic components (for example, control blocks) and electrical circuits (for example, an electrical engineering system, highlighting) of gas-consuming equipment from the destruction of wandering currents. The insert is installed between the gas valve and the gas lining. Of course, a gas meter may suffer from wandering currents. And, more importantly, the insert is insulating eliminates the possible heating and even the spark of the metal liner for gas as a result of the accumulation of electric potential.
The reasons for the occurrence of wandering currents, or leakage currents, several. The main ones are:
-Avil the insulator on the gas highway. The steel pipes of the main gas pipelines to prevent corrosion are specially served by a small electrical potential, which should be embedded at the entrance to the apartment building or at the exit from the gas distribution unit in the immediate vicinity of the removal to the individual house. For these purposes, a special trunk insertion is used dielectric. In the event of its destruction or there is no absence, the electric potential penetrates freely in the domestic and domestic gas pipelines.
-The touch of electrical grounding, electrical wiring fault and local electrical circuits. Modern gas consumers (gas boilers and water heaters, stoves, brass cabinets, etc.) are often styled with electronics and local electrical circuits. These are electronic control modules, and electrical tract, and timers, and backlight systems, etc. In the absence of the necessary electrical grounding, as well as when the electricity is hit on the metal case of the equipment due to the malfunction of the local electrkets (the so-called mass breakdown), such equipment itself becomes the source of malicious currents.
-Heason grounding of electrical appliances on gas steel pipes. Often your neighbors who have commissioned work on connecting certain electrical appliances "craftsmen" are in a happy ignorance regarding the fact of grounding their (neighbor) electrical appliances on the gas pipe.

SPECIFICATIONS:

Connecting dimensions isoic insert: 1/2", 3/4";
Execution option: fitting fitting;
Metal parts material: brass CW614N according to EN12165, an analogue of brassy Plumbing LS59-1 according to GOST 15527;
Dielectric: polyamide according to GOST 14202-69 with a category of resistance to the combustion of PV-0 according to GOST 28157-89;
Nominal pressure PN \u003d 6 BAR (or about 6 atm). For reference: According to SNiP 2.04.08-87, the gas pressure of up to 0.03 atm is considered normal in the domestic and intra-quarters of gas pipelines;
Table of translation units available on our website.
Electrical resistance: more than 5 MΩ at u \u003d 1000V;
Range of operating temperatures: from -60 to +100 degrees. Celsius.

Using the insertion of insulating is regulated by the Mosgaz letter No. 01-21 / 425 dated December 26, 2008: "... When connecting gas stoves on a flexible eyeliner to provide a dielectric insert."

Insert dielectric:

>Why do you need a dielectric coupling for gas and how to install it?

Dielectric clutch - This is a compartment fitting, which protects the "brains" of the gas consuming gas from the devastating effects of wandering currents. That is, we have a very useful node before us, the effectiveness of which is proved by the definition itself. However, many owners of gas stoves, columns and boilers, as well as gas services, do not know about the existence of such an insertion. And in this material we will try to eliminate this gap in knowledge, told about the benefits dielectric fitting, its varieties and methods of installation.

Wandering current - where he is taken in the gas pipeline

Such currents appear in the land due to the random breakdown of the household or industrial power line. The source of the wandering voltage can become both ground loop and electrified railway or tram line. In the gas pipeline, this current falls as a result of the difference between the specific resistance of the Earth and the metal parts of the supply gas highway. In fact, all electricity discarded in the ground is not in the ground (he has too much resistance), and in uninsulated cables or metal structures. And since most of the main and household gas pipelines are made of metal, the appearance in the wandering current system is only a matter of time.

The source of the wandering voltage in the household gas pipeline may be a trunk tube. To protect the gas supply pipe from corrosion, the highway is loaded with an electrical potential of minor strength, which suppresses the natural process of electrochemical splitting in the structural material. And if in the overall insulator separating the highway from the household branch, there will be a sample of a dielectric insert for gas, then the useful protective potential will turn into an unwanted wandering current.

In addition, the wandering voltage may appear in the inner line of gas supply, due to the poor-quality grounding of the circulation pump or other electrical appliances in contact with the wiring of the heating system or the home branch of the gas pipeline. Another reason for the appearance of such currents may be an error when installing boiler, column or gas stove connected to the power grid. As you can see, the wandering current is not a myth, but a real problem. And under its action, the metal structures turns into a serious threat to the safety of all residents of the house connected to the gas pipeline.

What happens if there is no compartment fitting in the system

To cut off the wandering currents in pipelines, use special dielectric insert. It is crashed on the plot between the crane and the eyeliner to the gas consuming device. Or on the plot between the gearbox and the gas meter. What happens if there is no such insert? Believe me, nothing good.

First, your or neighbor plate, column or boiler may suffer from wandering current or turn into a source. As a result, the risk of loss of their performance arises, due to the defeat of the "smart" stuffing, assembled on the basis of capricious chips that are reacting even for minor voltage jumps.
Secondly, a spark may occur in the pipeline - a fire source. Moreover, the cases of self-burning eyeliner are not so rarely found. And if this fact is not detected on time, the case may end a big catastrophe. The detonation of the gas-air mixture can destroy even a multi-apartment building.
Thirdly, the user can hit the electric shock. If the potential of the wandering charge is significant, and this happens during a thunderstorm or accident in the power grid, then we can not go about the unpleasant "bitus", but about full injury with difficult proceeds.

Varieties of dielectric countners - couplings and sleeves

The commodity nomenclature of the wandering currents for gas distribution systems is customary to divide into two groups in which:

Dielectric couplings (MD) - Special fittings with threaded ends, mounted between the gas pipeline and consuming blue fuel by the device.

Dielectric sleeves (VD)- non-conductive currents of the liners installed at the place of the collapsible interface of the elements of the gas pipeline.

In turn, the nomenclature of the couplings is divided into four sizes, based on the diameters of the threaded part: ½, ¾, 1, 1 ¼. Such a set allows you to cover all types of pipeline fittings used in gas pipelines, since the diameters are less than ½ inches and more inches with a quarter in such systems do not apply. In addition, the nomenclature of the couplings can be divided by the structural features of this fitting, highlighting three groups: MD thread / thread, MD carving / nut, MD nut / nut. After all, the thread of this fitting can be sliced \u200b\u200bboth outside and inside the end.

The range of dielectric sleeves is divided only, based on their geometric sizes - in the diameter of the liner. In this case, we are dealing with 11 sizes and diameters from 8 to 27 millimeters. At the same time, the couplings and the sleeves have the same margin of strength. The working pressure of the same variety of the connoissers is 0.6 MPa (about 6 atmospheres), and the limit - 50 MPa (493 atmosphere). As a dielectric, in the same case, a practically non-combustible polymer is used - polyamide with colossal resistance (about 5 million ohms).

How to install a coupling - act carefully

Dielectric clutch Must be mounted between the gas distribution crane and consuming instrument, so the next sequence of actions is used when mounting dielectric counts:

We cover the valve on the metal pipe supplying gas to the stove, boiler or column. At the same time, the burners of the instruments are better to leave open to burn out gas in the subport.
Holding the valve case by the first adjustable key, carefully twist the second key supply nut - the flexible pipeline (hose), connecting the shut-off node with the nozzle of the boiler gas receiver, plates or columns. The use of a pair of keys in this case is mandatory, since the supply nut can "attach" to the fitting or the valve nozzle and transfer to it the torque, after which the gas rises into the room, and it will be possible to block it in the room only the outdoor gearbox.
Think on the free ends of the clutch FMU (polymer seal) and screw it into the valve of the gas pipeline with hands. Next, we take the same two keys and holding the body of the valve, screw the coupling until it stops. Try not to overdo it at this stage, because an excessive force leads to deformation of the valve body and gas leakage.
Screw to the free end of the coupling nut of the supply to the instrument consuming gas, controlling its effort and holding the fitting with one of the adjustable keys.
Next, it is necessary to check the tightness of the resulting compound. To do this, you need to purchase loss for shaving and, thoroughly washed it, process all the junctions of the valve, coupling and supply. After that, you open the valve and watch the foam on the joints. If you have not seen bubbles - the joints are tightly tightly, and your gas pipeline is ready for safe operation.

In the case of the detection of soap bubbles at the joints, it is necessary to overlap the gas supply valve and gently tighten the coupling or the supply nut. If it did not help, you will have to disassemble all the connection and add a few turns of the FMU to the ends of the coupling.

And with a strong leakage you can cover a panic - the type of flaming valve detected even the most cold-blooded masters from equilibrium. Therefore, the best tester for tightness is soapy foam.

The goods ordered in the Obi store are delivered in Moscow and the Moscow region within 50 km from the Moscow Ring Road. The shipping cost is automatically calculated when placing an online order, based on the weight of the goods and the delivery area.

Minimum order amount for free shipping:

We deliver your order for free if the shipping address is located in the first online order zone, as well as:

> 5 000.00 ₽ - for orders weighing up 5.0 kg
> 10 000.00 ₽ - for orders weighing up 30.0 kg

The courier service delivers small orders (weighing up to 30 kg) to the buyer's doors, large-sized - before the entrance (wicket, gate) at home. Delivery includes free unloading of goods from the machine and transfer them within 10 m.

Date and delivery time

Delivery The next day is possible when placing an order until 18:00. You will be offered to choose from one of two 7-hour delivery intervals:

- from 10:00 to 16:00
- from 15:00 to 22:00

If you want to reduce the waiting period, you can choose one of the 3-hour delivery intervals:

- from 10:00 to 13:00 +350.00 ₽.
- from 13:00 to 16:00 +300.00 ₽.
- from 16:00 to 19:00 +300.00 ₽.
- from 19:00 to 22:00 +350.00 ₽.

The transfer of the date and the change in the temporary delivery interval is possible no later than 24 hours before the date and time agreed.

Read more to get acquainted with the terms of the courier service in the section

The dielectric coupling is a fitting-cutter, which protects the "brains" of the gas consuming gas from the devastating effects of wandering currents. That is, we have a very useful node before us, the effectiveness of which is proved by the definition itself. However, many owners of gas stoves, columns and boilers, as well as gas services, do not know about the existence of such an insert. And in this material we will try to eliminate this gap in knowledge, told about the benefits of dielectric fitting, its varieties and installation methods.

Wandering current - where he is taken in the gas pipeline

What happens if there is no compartment fitting in the system

To cut off the wandering currents in pipelines, a special dielectric insert is used. It is crashed on the plot between the crane and the eyeliner to the gas consuming device. Or on the plot between the gearbox and the gas meter. What happens if there is no such insert? Believe me, nothing good. First, your or neighbor plate, column or boiler may suffer from wandering current or turn into a source. As a result, the risk of loss of their performance arises, due to the defeat of the "smart" stuffing, assembled on the basis of capricious chips that are reacting even for minor voltage jumps.

Secondly, a spark may occur in the pipeline - a fire source. Moreover, the cases of self-burning eyeliner are not so rarely found. And if this fact is not detected on time, the case may end a big catastrophe. The detonation of the gas-air mixture can destroy even a multi-apartment building. Thirdly, the user can hit the electric shock. If the potential of the wandering charge is significant, and this happens during a thunderstorm or accident in the power grid, then we can not go about the unpleasant "bitus", but about full injury with difficult proceeds.

Therefore, in the CP Director of the SP 42-101-2003, regulating the construction of gas distribution systems, there is a special paragraph (6.4), stipulating the mandatory presence of a dielectric insert, used even in polyethylene pipelines. And the modern industry produces several types of such cutters.

Varieties of dielectric countners - couplings and sleeves

The commodity nomenclature of the wandering currents for gas distribution systems is customary to divide into two groups in which:

Dielectric couplings (MD) are special fittings with threaded ends, mounted between the gas pipeline and consuming blue fuel by the device.
Dielectric sleeves (VD) - non-conductive liner currents installed at the place of collapsible interface of the elements of the gas pipeline.

How to install a coupling - act carefully

Paragraph 6. 4 CP rules 42-101-2003 indicates that MD and VDs must be mounted between the gas distribution crane and the consuming instrument, so the following sequence of actions is used when mounting dielectric cutters:

We cover the valve on the metal pipe supplying gas to the stove, boiler or column. At the same time, the burners of the instruments are better to leave open to burn out gas in the subport.
Holding the valve case by the first adjustable key, carefully twist the second key supply nut - the flexible pipeline (hose), connecting the shut-off node with the nozzle of the boiler gas receiver, plates or columns. The use of a pair of keys in this case is mandatory, since the supply nut can "attach" to the fitting or the valve nozzle and transfer to it the torque, after which the gas rises into the room, and it will be possible to block it in the room only the outdoor gearbox.
Think on the free ends of the clutch FMU (polymer seal) and screw it into the valve of the gas pipeline with hands. Next, we take the same two keys and holding the body of the valve, screw the coupling until it stops. Try not to overdo it at this stage, because an excessive force leads to deformation of the valve body and gas leakage.
Screw to the free end of the coupling nut of the supply to the instrument consuming gas, controlling its effort and holding the fitting with one of the adjustable keys.
Next, it is necessary to check the tightness of the resulting compound. To do this, you need to purchase loss for shaving and, thoroughly washed it, process all the junctions of the valve, coupling and supply. After that, you open the valve and watch the foam on the joints. If you have not seen bubbles - the joints are tightly tightly, and your gas pipeline is ready for safe operation.

In the case of the detection of soap bubbles at the joints, it is necessary to overlap the gas supply valve and gently tighten the coupling or the supply nut. If it did not help, you will have to disassemble all the connection and add a few turns of the FMU to the ends of the coupling.

Attention: the use of matches or lighters instead of soapy foam when testing the tightness of the joints is strictly prohibited. You may not have time to react and block the gas by provoking a serious fire. And with a strong leakage you can cover a panic - the type of flaming valve detected even the most cold-blooded masters from equilibrium. Therefore, the best tester for tightness is soapy foam.

1 area of \u200b\u200buse

1.1. Inserts are insulating (hereinafter referred to as inserts) for intravarter gas pipelines are intended to eliminate leakage currents when the housing of an electrical gas device occurs on the case.

1.2. Inserts are intended for installation on gas pipelines transporting natural gas according to GOST 5542-87 and liquefied gas according to GOST 20448-90 and GOST R 52087-2003.

1.3. The use of inserting the insulating provided by the SP 42-101-2003 (general provisions for the design and construction of gas distribution systems from metal and polyethylene pipes).

2.Thechnical characteristics

2.1. Inserts are manufactured according to TU 4859-008-96428154-2009.

2.2. The production of inserts is carried out in a mold on the thermoplastic machine by the method of the auger extrusion of IE polymer material as an electric insulator and metal threaded pipes.

2.3. Operating pressure insert: 0.6 MPa.

2.4. Destructive insert pressure. 1.2 MPa, not less.

2.5. Operating temperature: from -20 "with to +80" s.

2.7. Electrical strength. Inserts withstand the test voltage of 37508 AC with a frequency of 50 Hz applied to metal pipes. Power of electrotock is not allowed. Electrical strength is ensured within 1 min., Not less. The leakage current does not exceed 5.0 mA.

2.8. The specific electrical resistance of the 10008 DC insert insert is 5.0 MΩ, not less.

2.9. The category of resistance of the polymer electrical insulating material PV-0 (according to GOST 28157-89). The electrical insulating material has a distinctive color of yellow (according to GOST 14202-69, group 4, combustible gases (including liquefied gases)) at the request of the consumer, the use of black material is allowed.

2.10. Marking. A marking is applied to the surface of an electrical insulating material, including the indication of the trademark, 1 / di-gas, and the conditional diameter, for example, DN20.

2.11. Conditional insert diameters (threaded nozzles): DN15 (1/2 "), DN20 (3/4").

2.12. Internal pass diameter. DN15 10.0 mm, DN20: 15.0 mm.

2.13. Connection Type Thread Pipe Cylindrical, Outer / External Thread.

3. Transportation and storage

3.1. Inserts can be transported by various types of transport subject to protection from mechanical damage, the effects of atmospheric precipitation in accordance with the rules of transport in this type of transport.

3.2. Inserts are stored in conditions of closed and other rooms with natural ventilation without artificially adjustable climatic conditions, where air temperature and humidity fluctuations are substantially less than in the outdoors (for example, stone, concrete, metal storage facilities with thermal insulation and other storages) located in any Macraptic Areas, including temperate and cold climates.

4. Installation and execution instructions

4.1. Installation of insertion should be carried out by specialists who have been trained and licensed to connect gas equipment.

4.2. It is forbidden to dismantle / install inserts without prior overlap of the gas supply crane.

4.3. Inserts do not require verification and maintenance during operation.

4.4 Insert is applied complete with a flexible metal lining to gas electrified devices and is installed on an intra-quarter gas pipeline on a slice after the crane.

5. Manufacturer's guarantee

5.1. The manufacturer guarantees the correspondence of inserts with the requirements of TU 4859-008-96428154-2009 when consumer complied with the condition, storage, installation and operation.

5.2. The warranty period is 36 months from the date of commissioning, but not more than 60 months from the date of manufacture, subject to the compliance with the rules for storage, installation and operation.

5.3. Lifetime insert - 20 years. During the operation of the maintenance does not require.

5.4. The manufacturer reserves the right to make changes to the design of the insert without notifying the consumer.