Whether the water supply zone is controlled by 0 45 or 0 35 MPa

The top layer is considered according to the head of 10 meters, the height of the layer is 3 meters, from top to bottom 8 layers, the water pressure of the eighth layer is 10 + 8x3 = 34 meters, the specification requirements do not exceed, the ninth layer begins to set up the pressure reducing valve, set up the adjustable pressure reducing valve, and the pressure behind the valve can be.

Considering the loss of pipelines and the large situation of the park, it is recommended to set up pressure reducing valves from the top to the bottom 7 floors, and the 8th floor.

The opening of the opening and closing parts in the control valve body is used to adjust the flow of the medium, the pressure of the medium is reduced, and at the same time, the opening of the opening and closing parts is adjusted by the effect of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range, and the cooling water is sprayed in the valve body or behind the valve to reduce the temperature of the medium.

The design of building water supply and drainage should meet the requirements of life, production and fire protection, and should also provide convenient conditions for construction and installation, operation management, maintenance and testing, and safety protection.

When the water supply pressure of the outdoor pipe network can only meet the water supply requirements of the lower layer of the building, in order to fully and effectively use the water pressure of the outdoor pipe network, the water supply system of the building is often divided into two water supply areas. The lower area is directly supplied by the outdoor pipe network, and the upper area is supplied by the combined water supply of pumps and water tanks. The two sections can be connected by one or several risers, and a valve is set at the partition to provide water to the low area when the water inlet pipe in the low area fails or the pressure of the external network is insufficient, and the valve is opened to supply water from the water tank in the high area to the low area.

According to the interrelationship between the zones, the water supply mode of high-rise buildings can be divided into series water supply mode, parallel water supply mode and pressure reducing water supply mode. The design should be based on the actual situation of the project, in accordance with the principle of safe and reliable water supply, advanced technology, economic and reasonable water supply to determine the water supply mode.

Vertical partition to consider the size of the water pressure and water supply mode, if the area to consider the use of municipal water supply direct supply, generally only 3 5 layers, and the highest control point of the district to meet the minimum head requirements, the others are usually every 300kpa a district, generally 8 layers.

Generally, according to the construction of expansion joints to partition, relatively large projects can be partitioned according to the length, while taking into account the number of sanitary ware reasonable adjustment.

Pressure and flow calculations are the most basic calculations.

Code for Design of Building Water Supply and Drainage (2009 Edition) (GB50015-2003) stipulates the following:

3 3 5 The domestic water supply system of high-rise buildings should be vertically partitioned, and the vertical partition pressure should meet the following requirements:

1. The hydrostatic pressure at the minimum water distribution point of sanitary appliances in each zone should not be greater than;

2. If the hydrostatic pressure is greater than the inlet pipe (or water distribution horizontal pipe), it is advisable to set up pressure reduction or pressure regulating facilities;

3. The water pressure of the most unfavorable water distribution point in each zone should meet the water pressure requirements.

3 3 5a The water supply pressure of the entrance pipe of the residential building should not be greater than.

3 3 6 The domestic water supply system of the building with a building height of no more than 100m should adopt the water supply mode of vertical zonal parallel water supply or zonal pressure reduction; For buildings with a building height of more than 100m, it is advisable to adopt a vertical series water supply method.

According to the consideration of not exceeding, the actual design of the household pipe is not exceeded, and the water pressure of the highest layer is not less than that in each partition, and the pressure of the lowest layer is not exceeded. Interpretation of the provisions 3 3 5 The vertical zoning of the domestic water supply system of high-rise buildings shall be comprehensively determined according to the purpose of the building, the height of the building, the performance of materials and equipment, and other factors. The purpose of the zonal water supply is not only to prevent damage to the water supply fittings, but also to avoid unnecessary waste of water caused by excessive water supply pressure.

Maybe the elevation of the entrance is higher than the elevation of the lowest sanitary appliance water distribution point, and this can be achieved if the height difference between the lowest sanitary appliance water distribution point is large... I don't know if that's right.

This is a new clause, a mandatory regulation, and a reference to the mandatory regulation.

High-rise buildings are not necessarily residential (residential) buildings, and there is no contradiction.

The general pressure of the outdoor water supply pipe network is to generally meet the requirements of users on the 6th floor of the low area; I haven't done anything about the specific principles of zoning in the high district, so I'm not very clear. The high zone should be considered according to the hydrostatic pressure of the lowest sanitary appliance water distribution point.

Generally, the following water supply methods are used for secondary pressurization: Normal pressure is used below 6 floors.

1. Pool water pump (constant pressure frequency conversion or air pressure tank) pipe network system Water point This method is centralized water supply. About.

The first and second floors are commercial clusters, and there are many residential buildings built on them, and this water supply scheme is more commonly used at present. Generally, there is an underground living pool, centralized constant pressure frequency conversion water supply, no roof water tank, and the most unfavorable water point is the top-floor residence. There are generally three main water pumps, two open and one standby automatic switching, the pay pump is a small flow pump, and the main pump is automatically switched to the pay pump when the water consumption is small at night, so as to maintain the system pressure basically unchanged (the air pressure tank is generally not used for domestic water).

2. Pool, water pump, high water tank, water point.

This method is also a centralized water supply. This scheme is more commonly used in high-pressure water supply areas of single sub-high-rise and high-rise buildings. Generally, an underground water tank is also designed to be pumped through two pumps (one for use and one for backup) to the high water tank, and then the water supply from the high water tank down to each water point.

3. Unit water tank, unit booster pump, unit high-level water tank, no water point in each unit, this method has been simplified to the water inlet of the total water meter of the unit. The unit tank and unit booster pump are actually a single unit, which we call a unit booster. In 94, we cooperated with Shanghai Haiying Machinery Factory to develop the first generation of unit superchargers, which were used in the projects managed by us.

After half a year of use, the areas that need to be improved have been found and modified many times, and now the third generation product is used.

Because there is a fear that the pressure will be too high and the pipeline will burst, it is necessary to install a pressure reducing valve. This ensures that the pipes will not burst due to pressure.

The vertical partition of domestic water supply of high-rise buildings should be reasonably determined according to factors such as use requirements, equipment and material performance, maintenance and management conditions, building floors and height, and outdoor water supply water pressure. Generally, the pressure of water supply fittings of sanitary appliances at the lowest place should be controlled at:

Residences, hotels, restaurants, apartments, hospitals, etc.

In the unlikely event that the zonal water supply fails, there is a way out. It's the best of both worlds, and it doesn't cost much!

The water supply pressure in the high area is large, and the water has the pressure to sit back after the pump is stopped, so the pressure reducing valve is increased.

1. The zoning principle of the water supply system of high-rise buildings: the water pressure line of the first floor is, the second floor is, and the third floor or above is continuously added on the basis, that is, when this value exceeds the pressure of the outdoor water supply pipe network, it is a high area from this floor, and the following is a low area.

2. The reason for the water supply partition of high-rise buildings: if there is no partition, the pipe diameter of the main pipe is larger. The hydrostatic pressure in the lower part of the high-rise building is large, and the partition can take decompression measures.

3. The building water supply project is to send the water that meets the water quality standards to the water points of the living, production, and fire water supply systems to meet the requirements of water quantity and water pressure.

1 to 6 low areas, 6 to ?? Layer middle zone. Then there's the high zone.

It depends on how many layers you have.

Design requirements.

The selection of the pump requires a head, and low, medium and high are used to determine the head.