Estimate for water supply. Calculator for calculating the cost of water supply for a turnkey house How to check the estimate for adequacy in terms of price

Submersible pump Gilex (Russia) or Aquarius, hydraulic accumulator Gilex (Russia) 100 liters, shut-off and measuring valves, automatic control, filter, etc. Installation work.

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Wilo submersible pump, Gilex hydraulic accumulator (Russia) 100 liters, shut-off and measuring valves, automatic control, filter, etc. Installation work.

Pumping station Dzhileks (Russia), including hydraulic accumulator, shut-off and measuring valves, automatic control, filter, etc. Installation work.

Pumping station Grundfos (Denmark), including hydraulic accumulator, shut-off and measuring valves, automatic control, filter, etc. Installation work.

Termex (Russia) 100 liter wall-mounted electric water heater, shut-off and safety valves, installation.

Termex water heater (Russia) 200 liters wall-mounted electric, shut-off and safety valves, installation.

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Electrolux (Sweden) water heater up to 200 liters wall-mounted electric, shut-off and safety valves, installation.

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A caisson made of two concrete rings and a hatch. Installation (digging a pit, installation, concreting the bottom)

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Copper pipeline, a set of fittings, fasteners, shut-off valves, etc. Installation work: laying and securing pipes to water collection points.

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Autonomous biological treatment station Poplar or Unilos, delivery to the site, digging a pit for the station.
Laying a sewerage pipeline from the foundation, 10 m of electrical cable VVG 3*1.5 and laying it in HDPE corrugation, filling Topas with water and simultaneous sprinkling with sand (sand and water - supplied by the customer)

A water supply system is a set of pipelines and devices that ensure an uninterrupted supply of water to various sanitary fixtures and other devices that require it to operate. In its turn water supply calculation- this is a set of measures, as a result of which the maximum second, hourly and daily water consumption is initially determined. Moreover, not only the total liquid consumption is calculated, but also the consumption of cold and hot water separately. The remaining parameters described in SNiP 2.04.01-85 * "Internal water supply and sewerage of buildings", as well as the diameter of the pipeline, are already dependent on water consumption indicators. For example, one of these parameters is the nominal diameter of the meter.

This article presents example of calculating water supply for internal water supply for a private 2-storey house. As a result of this calculation, the total second water flow and the diameters of pipelines for plumbing fixtures located in the bathroom, toilet and kitchen were found. It also defines the minimum cross-section for the entrance pipe to the house. That is, we mean a pipe that originates at the source of water supply and ends at the point where it branches to consumers.

As for the other parameters given in the mentioned regulatory document, practice shows that it is not necessary to calculate them for a private home.

Example of water supply calculation

Initial data

The number of people living in the house is 4 people.

The house has the following sanitary fixtures.

Bathroom:

Bathroom with faucet - 1 pc.

San. node:

Toilet with flush tank - 1 pc.

Kitchen:

Washbasin with mixer - 1 pc.

Calculation

Formula for maximum second water flow:

q с = 5 q 0 tot α, l/s,

Where: q 0 tot - total liquid consumption of one consumed device, determined in accordance with clause 3.2. We accept by adj. 2 for the bathroom - 0.25 l/s, wc. node - 0.1 l/s, kitchen - 0.12 l/s.

α - coefficient determined according to app. 4 depending on the probability P and the number of plumbing fixtures N.

Determining the probability of operation of sanitary fixtures:

P = (U q hr,u tot) / (q 0 tot ·N·3600) = (4·10.5) / (0.25·3·3600) = 0.0155,

Where: U = 4 people - number of water consumers.

q hr,u tot = 10.5 l - the total rate of water consumption in liters by the consumer at the hour of greatest water consumption. We accept according to the adj. 3 for an apartment-type residential building with water supply, sewerage and bathtubs with gas water heaters.

N = 3 pcs. - number of plumbing fixtures.

Determining water flow for a bathroom:

α = 0.2035 - we accept according to the table. 2 adj. 4 depending on NP = 1·0.0155 = 0.0155.

q s = 5·0.25·0.2035 = 0.254 l/s.

Determination of water consumption for toilets. node:

α = 0.2035 - exactly the same as in the previous case, since the number of devices is the same.

q s = 5·0.1·0.2035 = 0.102 l/s.

Determination of water consumption for the kitchen:

α = 0.2035 - as in the previous case.

q s = 5·0.12·0.2035 = 0.122 l/s.

Determining the total water consumption for a private house:

α = 0.267 - since NP = 3·0.0155 = 0.0465.

q s = 5·0.25·0.267 = 0.334 l/s.

Formula for determining the diameter of the water supply pipe in the design area:

d = √((4 q с)/(π·V)) m,

Where: d is the internal diameter of the pipeline in the calculated section, m.

V - water flow speed, m/s. We take it equal to 2.5 m/s according to clause 7.6, which states that the speed of the liquid in the internal water supply cannot exceed 3 m/s.

q c is the fluid flow rate in the area, m 3 /s.

Determining the internal cross-section of a bathroom pipe:

d = √((4 0, 000254)/(3.14·2.5)) = 0.0114 m = 11.4 mm.

Determination of the internal section of the pipe for the bathroom. node:

d = √((4 0, 000102)/(3.14·2.5)) = 0.0072 m = 7.2 mm.

Determining the internal cross-section of a kitchen pipe:

d = √((4 0, 000122)/(3.14·2.5)) = 0.0079 m = 7.9 mm.

Determining the internal cross-section of the entrance pipe to the house:

d = √((4 0, 000334)/(3.14·2.5)) = 0.0131 m = 13.1 mm.

Conclusion: To supply water to a bathtub with a mixer, a pipe with an internal diameter of at least 11.4 mm is required, the toilet bowl to the bathroom. node - 7.2 mm, washbasin in the kitchen - 7.9 mm. As for the inlet diameter of the water supply system into the house (to supply 3 appliances), it must be at least 13.1 mm.

Another consequence of approximate calculations is subsequent payments “on the spot”. Agree, it’s unpleasant when they calculated your budget to be 200,000 rubles, but in fact you had to pay 300–350,000. There should be no additional amounts during the installation process - everything should be taken into account within the budget! The maximum deviation is then possible +/- 10%, but only if some hidden moments were revealed or you changed something during the play.

A good estimate should give the customer a feeling of complete understanding of what he will get in the end and what he is paying for - if there is no idea of ​​what the radiators will look like and where they will be located, or how the boiler room will be laid out and how it should be managed, the estimate is bad. If they don’t tell you what the consumption of gas, electricity, and solid fuel will be, the estimate is bad. This does not mean that you should be given a booklet on how to manage your system - that would be too expensive. But the person who calculates your estimate must answer all your questions accurately and confidently. Unfortunately, there are not many such specialists, but they exist. We teach our colleagues to approach communication with customers in exactly this way.

The estimate may not contain amounts for each item or may not contain specific items. Calculating estimates according to the BTI plan, for example, is a rather painstaking story. An engineer needs 4 hours to make a normal estimate for a house of 250 sq.m. that meets the requirements of paragraphs 1 and 2. Naturally, if a person “works” into the customer’s task, he wants to make it difficult for other people to recalculate the estimate directly. He invested time and effort and is ready to discuss the estimate with the customer down to the last nail. Any estimate, no matter how it looks, requires discussion. And it is never the final and only solution.

In engineering systems, any problem can be solved in different ways. Often companies and installers, like the colleague in the example about 22 positions above, consider standard solutions: Wall-mounted boiler, aluminum radiators, and so on. At the same time, such colleagues often do not care about the interests and needs of the customer - how many people will live in the house, apartment, what habits people have, what level of comfort the customer requires. Important: if, when drawing up an estimate, the customer is not asked additional questions about comfort, living conditions, expectations about operating costs, frequency of stay in the house, the customer’s desire to save money, then it is more likely that the solution is unprofessional and “clichéd.”

How then can you get a quick assessment of your heating system?

A quick estimate is always general and is usually needed for budgeting and rough estimates. . We usually say that with materials and work, a heating system “costs” from 1000 - 1200 rubles per sq.m. buildings/premises. This figure is presented only as a budget guide for an individual heating system in a basic configuration without water supply and sewerage.

Any estimate received by the customer is the result of the mental work of a particular engineer. This is his vision of how to optimally, efficiently and reliably solve the problem with which you came to him as a customer. Each engineer will calculate the estimate in his own way and rarely will the customer receive the same result from different independent engineers. And there is no right or wrong option here. The personality of the engineer, his understanding of what comfort, reliability and his understanding of your needs and budget leave an imprint on his work. Therefore, the estimate should be discussed. And for this reason, the personality of an engineer is very important. I saw engineers who said - this solution is exactly what the customer needs - and the customer agreed, relying on the engineer’s reputation. Often the hit was accurate, and customers came and said “Thank you.” At times the engineers made mistakes. Not in technology, but in the real state of affairs of the customer, his living conditions, family. For example, they installed a wall-mounted boiler in a house with several bathrooms and forgot to ask how often the mother-in-law comes. As a result, the mother-in-law did not leave and loved to take a bath. There was not enough hot water and the customer’s nerves were shaken day after day until he came to us with his problem. What was the mistake? Maybe the engineer didn’t ask the right question, maybe he wanted to save the customer’s money, thinking that he wouldn’t be able to afford it and wouldn’t buy more complex or productive equipment, who knows? The fact remains that any estimate must be thoroughly discussed and the customer must convey to the engineer his real needs and tasks.

How to check the estimate for adequacy in terms of price?

Any customer understands which items in the estimate form the main cost. If the cost of certain items is not included in the estimate, you have the right to request prices for specific items for which you must be provided with an article, name, and brand. Today there is the Internet - check 5-6 items from the estimate and formulate your understanding of the adequacy of the overall price offer. Here you just need to remember that the Internet is a funny space and often delivery to the place, availability and other aspects are not included in the price. We often come across the fact that on our colleagues’ website the price is the same, but when it actually comes to ordering, delivery, loading/unloading, and other extra charges “for availability” are added.

These 8 points are probably the main ones. There is another 9th point - contact more than one place for an estimate to understand the difference. Not the cost, but the difference in communication. What questions will be asked, how to respond to the answers. Where you feel comfortable, who you trust, order there. The main thing is that you understand what you are paying your money for.

Water supply networks are operated for a long period of time; in some multi-storey buildings it can last up to 50-60 years. This system requires constant monitoring, timely maintenance, as well as quick and professional repairs. In the event of a breakdown, the water supply is stopped, which becomes a serious problem, especially if the pipeline has significant dimensions. But before each repair, it is necessary to correctly calculate its cost. This activity requires knowledge of some regulatory documents and work procedures.

The main reasons why repair work is necessary

Any water supply system has a complex structure, which can be understood by people with appropriate education and work experience. But breakdowns, most often, are of the same nature. The main difficulty is troubleshooting, which can sometimes take a long time.

Major breakdowns in water supply networks:

• The pipeline and the main elements of the water supply network have reached the end of their service life. Pipe wear can be of a very complex nature, due to which repairs cannot be carried out, but only the failed element must be replaced.
• Pipeline blockages. A common problem that requires an immediate solution. Due to blockages, in multi-storey buildings, problems may arise with the water supply to the upper floors. The whole reason is pressure transfers that appear simultaneously with a plug in the water supply system.
• Pipeline corrosion or condensation. The problem occurs due to prolonged use and neglect of maintenance.
• Pipeline freezing. In this case, heating is carried out sequentially, at low temperatures. The operation requires experience.

Very often the breakdown is hidden and requires the use of special measuring materials. Detecting such a malfunction may take a long period of time. Elimination of an accident or repair of water supply networks can also last from several hours to several days.

How often are repairs carried out?

Repair work of water supply systems has its own frequency, which is established by regulatory documents. To extend the life of the pipeline and other system elements, it is necessary to carry out high-quality maintenance and periodic inspections.

Repair frequency:

• A complete replacement of cold water risers with completely new materials is carried out 30 years from the date of commissioning.
• The central heating system is replaced every 25 years.
• Complete replacement of hot water risers with new ones is carried out after 30 years. This procedure must be combined with a major overhaul. These conditions are only suitable for galvanized pipes. If the pipeline is not galvanized, it should be replaced every 15 years.

When replacing, work is carried out on all elements of the water supply system. It is possible to replace the pipeline and other parts of the system in advance only if there is severe wear and a possible threat to the life and health of the residents of the house.

How to calculate the cost of work

Before calculating the cost of major repairs, the volume of mandatory repair work is determined. The water supply system is diagnosed and problems are found that need to be addressed first and can lead to a long-term interruption of water supply.

After diagnostics, it is necessary to select the material from which various elements of the main pipeline and water supply network will be purchased. Also an important factor is the complexity of the repair work; it is entered in a separate column in the estimate. The service life of the pipeline and the entire system is of a certain importance during repairs, since certain materials, after a long period of time, may not be repairable and require replacement.

After taking into account all the above factors, an estimate for repair work is drawn up. It includes all the diagnostic results, the service life of the water supply system, the volume and complexity of the work, as well as the materials that will be used in the repair.

Step-by-step drawing up of estimates for water supply repairs

An estimate for repairs is an important step before starting repairs. It must carry all the information load that is necessary not only for high-quality work, but also for calculating their cost. Prices for repairing water supply systems are always higher than for laying a new water supply system, since one has to deal with significant problems, which sometimes take a lot of time to determine. No repair work will be carried out without confirmation of the estimate.

Repairing the internal water supply includes replacing pipes, introducing new pipes into the house, laying both cold and hot water supply systems, installing and checking the equipment necessary for operating the system, and installing heating devices.

Necessary documentation for drawing up an estimate:

• Explanatory notes from officials, as well as requests for repairs.
• Approved statements in which calculations for repairs and possible replacement of the water supply system were carried out.
• A separate estimate indicating the number of pipes needed to replace and the cost of the work.
• Summary calculation, which is carried out before submitting the documentation.

The above-described documentation must be attached to the estimate, as it has a confirmatory nature.

The sequence of drawing up an estimate for repairs:

• Record system diagnostic indicators. Without this information, it is impossible to draw up even an approximate work plan.
• Determination of the material with which work will be carried out. Its quantity is required, as well as the average pricing policy. Components, consumables, and necessary equipment are taken into account.
• Determining the cost of work. This also includes the time it will take to carry out the repairs. A separate column in the estimate includes the amount of repair work, which may vary depending on the condition of the water supply system.
• Calculation of the total amount, which includes the average prices for consumables, components and possible unexpected expenses.
• Calculation of wages for working personnel who will carry out repairs.
• Compulsory personnel insurance, which includes insurance for both social and pension insurance.

The estimate is an important document that allows you to control the company that won the tender. The sequence of work and deadlines are determined by the customer. Irresponsible or poor-quality work is not paid for; this is the main point of any estimate.

In addition to the estimate for repairs, an agreement may be drawn up, which will indicate that the contractor must carry out maintenance of the water supply system. This set of procedures is calculated according to a completely different pricing policy.

The procedure for drawing up an estimate for the repair of an external water supply system

The procedure for repairing external water supply has its own characteristics. Also, the estimate for the work and the purchase of necessary materials is drawn up a little differently.

Major repairs of external water supply include the following work:

• Laying new external water supply networks, as well as replacing old ones.
• Drilling wells of various depths.
• Digging wells and trenches using large equipment.
• Insulation of external water supply systems.

The final price of the estimate is also influenced by the features of the repair. These include difficult soil conditions, large volumes of work, and weather conditions. In addition to the large volume, the overall complexity of the repair is taken into account. Taking into account the factors described above allows us to optimize the estimate and correctly adjust its conditions to the customer and contractor.

The costs of maintaining a service that will eliminate emergency situations may also be indicated.

Calculation of repairs to water supply systems in a private house

When repairing water supply systems in a private home, an allowance is made for lower volumes of work. But the estimate may include the installation of additional automatic equipment. This type of work has a higher pricing policy.

When laying a new pipeline, calculations should be made with a minimum number of angles, as well as bends in the system. For pipes in a private home, it is necessary to select environmentally friendly materials with a long service life that do not react to the action of aggressive compounds.

Installation of pumps in a private house belongs to the section of installation of equipment for water supply systems. This type of work does not require a lot of time. But it is necessary to correctly follow the sequence indicated in the operating instructions in order to preserve warranty service.

Drilling wells and digging trenches can be carried out either using large-sized equipment or manually. In addition to the well, the estimate may include the installation of a pump and an additional filtration system.

Installation of a new water supply system must be carried out in accordance with all regulatory documentation. A separate item in the estimate indicates the payment of working personnel. Only after the estimate has been certified by the customer, the contractor can begin carrying out repair work.