How to calculate water flow
Water flow parameters:
- The diameter of the pipe, which also determines the further throughput.
- The value of the pipe wall, which will then determine the internal pressure in the system.
The only thing that does not affect the flow is the length of the communications.
If the diameter is known, the calculation can be made according to the following data:
- Construction material for pipe-building.
- Technology affecting the process of pipeline assembly.
The characteristics affect the pressure inside the water supply system and determine the water flow.
If you are looking for the answer to the question how to determine the water flow, then you must learn two calculation formulas that determine the parameters of use.
- The formula for calculating the day is Q = ΣQ × N / 100.Where ΣQ is the annual water use per inhabitant, and N is the number of inhabitants in the building.
- The formula for calculating the hour is q = Q × K / 24.Where Q - daily calculation, and K - the SNiP ratio is uneven consumption( 1.1-1.3).
These simple calculations can help to determine the expense, which will show the needs and requirements of this house. There are tables that can be used to calculate the fluid.
Reference data in the calculation of water
When using tables, you should calculate all the faucets, bathrooms and water heaters in the house. Table SNIP 2.04.02-84.
Standard consumption standards:
- 60 liters - 1 person.
- 160 liters - for 1 person, if the house is equipped with a better running water.
- 230 liters - for 1 person, in a house with a quality water supply and a bathroom.
- 350 liters - for 1 person with running water, built-in appliances, bathroom, toilet.
Why calculate water in accordance with SNIP?
How to determine the water flow per day is not the most requested information among ordinary residents of the house, but this information is required even less for pipeline installation specialists. And at most they need to know what the diameter of the connection is, and what pressure it maintains in the system.
But to determine these indicators it is necessary to know how much water is needed in the pipeline.
Formula that helps determine the pipe diameter and flow velocity:
The standard fluid velocity in the system without head is 0.7 m / s and 1.9 m / s. And the speed from an external source, such as a boiler, is determined from the source passport. If you know the diameter, the flow rate in the communications is determined.
Calculation of water pressure loss
The loss of water flow is calculated taking into account the pressure drop by one formula:
In the formula, L denotes the connection lengths, and λ is the friction loss, ρ is the ductility.
The frictional index varies from such values:
- the roughness level of the coating;
- obstacle in the equipment on the locking places;
- fluid flow rate;
- the length of the pipeline.
If you correctly calculate the losses at crisis points of communications, you can ensure a clear pressure in the pipes. Knowing the pressure loss, the fluid velocity in the pipes and the amount of water needed, how to determine the water flow and the size of the pipeline becomes much clearer. But in order to get rid of long calculations, you can use a special table.
Where D is the diameter of the pipe, q is the consumption flow of water, and V is the water speed, and is the rate. To determine the values, they must be found in the table and connected in a straight line. Also determine the flow and diameter, while taking into account the slope and speed. Therefore, the easiest way to calculate is to use tables and graphics.
