How to insert into the existing water supply under pressure
Do you want to organize the water supply of a country house by connecting it to the existing central highway? Automatic water supply will greatly simplify the life of the household, right? But for the implementation of your plan there is no possibility to block the water in the main pipeline and you need a tie-in to the water supply under pressure?
We will tell you how to perform a sidebar in practice, avoiding disconnection of consumers powered from the main line - the article describes the process of making the connection with all the requirements of the legislation. The material is provided with thematic photographic materials and useful video recommendations.
Careful examination of the stages of connecting to the central water supply of your household will help to avoid penalties for violation of the existing rules when unauthorized insertion into the pipeline. If desired, you can also save money by doing some earthworks on your own.
Work on the inset into the water mains, both by welding and without it, can not be carried out without obtaining appropriate permits.
The execution of an illegal tie-in traditionally ends with the attraction of the owner to financial and administrative responsibility.
The site plan can be obtained at the Federal Land Registration Center, and the technical conditions in the central department of the water utility.
The technical conditions for connection will include:
- connection point;
- diameter of the main pipeline;
- data required for tie-in.
In addition to the local structure of Vodokanal, the development of design and estimate documentation is carried out by specialized design organizations that have the appropriate license.
It is possible to order from them design and estimate documentation for making a tie-in to the main of the centralized water supply network.
Perhaps their services will be cheaper, but it is possible that problems may arise with the approval of Vodokanal design development.
Then the documentation for the sidebar should be registered with the local SES office. Simultaneously with the submission of the assembled package of documents to the SES branch, for registration it is required to leave an application for issuing an opinion on the need to connect to the water supply system.
According to generally accepted standards, the implementation of tapping pipes under pressure and the installation of metering devices must be carried out by qualified specialists who have the appropriate approval. Independently arbitrarily perform such work is prohibited.
Save, putting their own efforts to connect, it will only work on the production of earthworks during the development and backfilling of the trench.
The conditions under which you can not implement a sidebar:
- if the pipeline network has a large diameter;
- if land ownership is not connected to a central sewer system;
- if the tie-in is supposed to bypass the metering devices.
Even with all permits, pipe fitting to the existing network must be performed only by qualified specialists.
These include: earthworks (digging and backfilling trenches), material delivery and other types of auxiliary work that are not directly related to the tie-in procedure.
Of course, no one can forbid the owner to perform a sidebar on their own. Therefore, the article describes in detail the sequence of actions.
Construction of a well for arrangement of knot
To simplify the insertion into the existing water supply system, it is convenient to use a manhole. The diameter of the structure should be about 70 cm.
This space is enough to accommodate the shut-off valve (in the form of a valve or valve), as well as perform all the necessary manipulations for tapping.
In the future, during the operation, the presence of such a structure will facilitate the work on the repair of home water supply.
For the construction of the well dig a new pit of the appropriate size. The bottom of the pit is covered with a gravel "pillow", forming a layer 10 cm high.
In order to make a reliable foundation, spread out roofing felt cuts are laid out over the leveled gravel dumping and the concrete screed 10 cm thick is poured. When creating the fill, concrete M150 and M200 are used.
After three or four weeks, when the concrete acquires the necessary strength, a shaft is erected above the slab. For this, the walls of the pit are lined with bricks, cement blocks or reinforced concrete rings. Throat facilities must reach zero.
If the well is supposed to be installed on a site where the groundwater level rises to one meter during the flood period, it is necessary to construct a waterproof construction.
The most convenient way for this purpose is to purchase a finished plastic container. From below it is anchored to a concrete slab, on top of this design is covered with a cast slab, equipped with a hole for the installation of the hatch.
Inset depending on the type of pipe
Since the water mains are assembled from polymeric, galvanized and cast iron pipes, we will consider all the available options for fitting the sidebar.
№1 - work with polymer reinforcement
When dealing with polymer reinforcement, the technology of tapping is carried out in such a sequence. Having decided on the place of insertion of the pipe, prepare the site.
To do this, a flat place in the puncture zone of the body of the pipe is thoroughly cleaned with sandpaper from accumulations of rust and paint residues.
To the prepared place by means of bolts fix the collar, equipped with terminals for connecting the welding machine. After installing the assembly and connecting the contacts of the welding machine to the terminals, voltage is applied to it.
When installed on a polymeric pipe of an electrically-welded collapsible yoke, the design is first disconnected into a vertical nozzle with a valve, through the cavity of which the reaming head is buried, and straight-through nozzles.
At the other end of the lining in the area where the drill will be deepened, mount the valve with the sleeve.Equipment for drilling is attached to it, after which with the help of an ordinary drill a hole is carefully made in the line.
The drill should only be inserted through a shut-off valve so that after the “breakdown” of the pipe body, shut off the flow of water and freely remove the cutting tool. To ensure the tightness of the joint during drilling, a special nozzle is used.
A new section of the input pipe is connected to the flange located on the valve. The collar is mounted above the place of inset, and then by heating the spiral of the welding apparatus they solder the pipe body. The result is a high-strength hermetic joint.
No. 2 - connection of cast iron pipes
In the presence of a cast-iron pipe, which is much harder than polymer analogs, the procedure is performed in the following sequence:
- In the place of the future “breakdown”, the area is cleaned of rust and removed by the grinder a layer of hot iron.
- Install the nurse on the site, not forgetting to lay the rubber seals.
- A stop valve is attached to the flange outlet, into the cavity of which a crown is inserted.
- Begin to drill through the pipe, not forgetting to cool the place of the cut and in time to change dull crowns. You need to drill in several stages: first with a small-diameter drill, and then a little more.
- After removing the crown from the valve, close the valve, cutting off the water supply from the nozzle.
- Restore anticorrosion coating and insulation.
To create holes in the cavity of cast-iron pipes, crowns equipped with carbide cutting plates or drills with feather sharpening are used.
When working with them, it is important to exclude overheating of the tool, wetting periodically cutting parts with water for this.
To protect the power tool from the ingress of water at the time of removing the cutting part of the hole, from a thick cardboard or rubber erect a protective screen. It is located between the body and the cartridge.
When engaging the saddle collar for tapping into the metal pipe, in order to ensure its tight fit to the surface, sealing bands are used.
A special machine can be additionally attached to such a device, the main elements of which are:
- locking bolt;
- ratchet handle;
- flushing tap;
- shaft with a drill.
All design elements are enclosed in a metal case. The presence of the guide sleeve allows you to simplify the drilling process, in which the drill is convenient to have in any direction.
No. 3 - features of work with steel pipes
Steel pipes on ring stiffness are not inferior to iron fittings. But steel is a more ductile iron-carbon alloy.
Therefore, the sidebar can be implemented by implementing a different technology, in which the method of matching resembles the one used in the installation of polymer pipes.
The technology of tapping into a steel pipeline includes a number of basic steps:
- The area to be inserted, excavated and cleaned of rust.
- A threaded or flanged pipe is mounted on the pipe section by welding.
- Weld seams.
- Check the seams for tightness.
- A flanged or threaded valve is fixed to the nozzle.
- A valve is used to drill a pipe through a valve.
- Behind the mounted valve establish a branch of an external water supply system.
Ideally, the nozzle should be made of "trunk" valves. But it is also allowed to use any other variety of pipe products, the basis for which is structural steel.
Visually determine the tightness of the seams will help this "trick": from the inside they are coated with kerosene, and from the outside - marked with chalk contours. Defects in the tightness of the joint will be indicated by oil stains that appear on the outside of the structure.
The main stages of the procedure
The choice of method of tie-in depends on the material of manufacture of pipes, the working pressure in the system and the conditions of its operation. It can be performed at an angle of 45 and 90 degrees, arranged in an upward or to the side.
Step # 1 - Determination of Plot
Before you begin to insert into the water supply system, it is necessary to clearly define the location of the route. The central highway should be located in a straight line.
For regions of middle latitudes, this figure varies in the range of 1.2-1.5 meters.
At this stage, it is also necessary to determine which other communications “lie” within the site, so as not to accidentally damage them during the excavation and installation process.
Step # 2 - Choosing the Required Materials
To connect using pipelines made of polyethylene, cast iron or galvanized steel with a diameter of 50 mm and above. Work on the lines with pipelines made of polyethylene, exclude the use of electric and gas welding.
During the work with cast iron it is worth considering that it is quite fragile material. Therefore, the pressure on the tool in the process of work should be minimal, and drilling should be done at low revs.
When choosing pipes for the implementation of a tie-in, it should be noted that the diameter of the discharge pipe should not exceed the size of the hole in which it is made.
For connection to the plastic pipeline, the pressure of which is about 1.6 MPa, use saddles.
Devices are equipped with a heating spiral and a mill necessary for creation of an opening.The presence of a bar code on the body of the part allows welding parameters to be set with the required accuracy.
To perform a tie-in without turning off the water supply on pipes made of asbestos cement, steel or cast iron, use a saddle or saddle clamp.
It consists of two parts and is equipped with bolts, thanks to which it tightly compresses the pipe from two sides. The device is mounted on the pipeline with the help of the bracket.
Recently often use clamps, modules of which are equipped with a cutter and built-in valves. They are used for tapping pipelines with a pressure within 16 bar. Such devices are equipped with couplings and allow insertion by welding.
The main advantage of the collars is corrosion resistance, thanks to which they are able to serve for more than half a century.
Often for insertion of pipes under pressure, masters use pre-drill clamps.They are sold complete with nozzles and swivel connectors.
On sale there are several types of drill bits, which can be installed on pipes with a diameter of 80 to 300 mm.
From the tools you also need to prepare:
- bayonet and shovel shovel;
- perforator with a drill;
- the device for a mill;
- sandpaper cut.
When choosing the drill diameter, follow the rule of equality between the tool size and the internal section of the pipe being cut.
Step # 3 - Excavating
To bare the trunk, dig a pit. It can be dug manually or with an excavator.
But even when performing excavation work by means of mechanization, as soon as the metal tape laid on top of the highway is exposed, further manipulations should be carried out manually.
After exposing a section of the pipe, they start digging a trench in the direction of the house. It lay below the level of soil freezing.
Any manipulations with a pipeline under pressure require strict compliance with safety regulations and strict implementation of all phases of the operation.
Step # 4 - Allotment from the trunk
Applying one of the above methods, perform a tie-in to the existing water supply under pressure.
At the final stage, the pipe of the external branch of the aqueduct is laid in a trench and connected to a shut-off valve by means of a crimp coupling.
When diverting from the water line, the beginning of the new water supply will be located on the valve of the clamp, and the end - on the metering device of water flow.
The counter, the main purpose of which is to record the volume of incoming water, is positioned so that it is located between the shut-off valves.
To protect the metering device from the reverse flow of fluid, you must install a check valve.
If the tie-in into the water supply system implies the passage through the wall, then during installation a gap in the structure should be provided - a space of 0.2 meters in size.
After installation, this space is sealed with waterproof glands or resin strands. To disguise the formed seals, they are covered with a cement trim.
Step # 5 - Adjustment and Testing Systems
The correctness of the connection and connection of all elements of the system is checked by testing. To do this, pressure is supplied to the new pipeline line, and the air accumulated in the system is released through a valve located at the other end of the pipe.
Convinced of the tightness of the water supply, it remains only to bury the trench, laid from the place of tie-in to the house.
Conclusions and useful video on the topic
Tips wizard: how to make a tie-in under pressure:
The principle of operation of the device for tapping:
The consequences of poor installation:
Manipulations for insertion under pressure must be made taking into account all the listed recommendations and rules.Failure to comply with the conditions is likely to violate the integrity of the system, which will reduce all efforts to "no" and lead to disastrous consequences..