Can the booster pump be used if the tap water pressure is in

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-24 09:42

Can the booster pump be used if the tap water pressure is insufficient?

When the tap water pressure is insufficient, the booster pump shall be used for boosting. Circulating pump shall be adopted for heating system to overcome resistance and improve circulating power of the system. In practical application, it is usually necessary to use multiple pumps in series or in parallel. The purpose of the tandem pump is to increase lift, while the purpose of the parallel pump is to increase flow.

1、 Selection of water pump

1. Select water pump according to use

If you want to increase or stabilize the domestic water pressure, you can choose a small booster pump; if you want to overcome the system resistance and increase the circular power of the system, you should choose a circular pump.

2. Select pump according to pressure and flow.

The pressure mentioned here means that the pressure supplied by the pump is greater than the total pressure loss of the system. If there is a head in the construction drawing, the pump selection must meet this requirement. In addition to considering the pressure, we should also consider the influence of water flow. The larger the water flow, the smaller the useful pressure provided by the pump. On the contrary, when the water flow is 00:00, the greater the pressure, the greater the maximum pressure.

In addition to considering the diameter of pump and pipe diameter, the selection of booster pump should also consider whether the selected power and head can be really lifted and adjusted, and should consider the convenience of use.

When working voltage, current, head and flow, diameter and maximum pump head are determined, there is no static head of water flow. If the user requires to pump water to a certain height and maintain a certain flow, the head required for selecting the pump must be higher than the specified pumping height. It can be determined by referring to the head flow curve.

Select volume and shape requirements (screw connection, inlet and outlet direction, caliber, etc.)

Determine the working environment (temperature, medium).

Determine the functional requirements (time control, action control, pressure control, flow control, speed control, etc.).

The so-called convenient use means that the water pump has the control function; when the hot water valve is opened, the water pump runs; when the hot water valve is closed, the water pump stops running, so that the water pump is still running after the valve is closed, thus damaging the water pump. What kind of booster pump can I choose to solve this problem? That's an automatic booster pump.

The working principle of the automatic booster pump is that when there is water flow, the built-in water flow sensor can connect the power supply of the pump by detecting the water flow. When the water flow becomes smaller or equal to zero, the turbine rotor slows down or stops running, and the pump power supply is cut off. Another solution is the external water pressure switch of the booster pump. When the valve is opened, the pressure difference increases, the water pressure switch acts, the power is turned on, and the pump starts. When the valve is closed, the pressure difference decreases, the water pressure switch returns, the power is cut off and the pump stops. This method of installing the external hydraulic switch is troublesome.

2、 Determination of installation position of circulating water pump in open or closed expansion water tank system

When the circulating water pump is installed in the system with open or closed expansion water tank, the pump shall be in the best position so that the pump can make the best use of the expansion water tank.

1. Concept of expansion water tank system

The expansion water tank in the heating cycle path of the heating furnace is connected with the atmosphere called "open expansion water tank system", and the expansion water tank in the heating cycle path of the heating water heater is isolated from the atmosphere, which is called "closed expansion water tank system".

2. Function of expansion water tank in water system

Expansion water tank is one of the main equipment of mechanical ring type hot water heating system. Its main function is to keep the system pressure constant, adjust and compensate the expansion and contraction of water in the system, and exhaust. The expansion tank is usually connected to the return main near the suction of the circulating pump.

The expansion tank is used in the closed water circulation system to balance the water capacity and pressure and avoid frequent opening of safety valve and frequent filling of automatic replenishment valve. The expansion tank not only holds the expansion water, but also fills the tank. The expansion tank is filled with nitrogen to obtain larger solvent to hold the expansion water. The high pressure and low pressure expansion tanks can use their own pressure to supply water to the pressure stabilization system in parallel.

When the expansion tank is used in the boiling water circulation system, its installation position has a great influence on the system pressure. The position of the connection point between the expansion water tank and the heating system determines the position of the constant pressure point of the system. That is to say, whether the system is working or stopped, the pressure at this time is constant. In the heating system, the position of constant pressure point is different, which affects the pressure distribution of supply and return pipe and users. Therefore, the location of constant pressure point plays an important role in the mechanical circulating hot water heating system. The installation height of the open expansion water tank must exceed the filling height of the highest user and be connected with the water return pipe at the suction of the circulating water pump.

The static pressure of the system is related to the installation height of the expansion tank. If the pressure of each point of the system pipeline exceeds the atmospheric pressure, there will be no negative pressure, nor will it cause the vaporization of hot water or the inhalation of air. In order to prevent vaporization, cavitation noise and bearing damage, the pump suction must be maintained at a certain pressure (usually 30KPa to 40kpa). Since the expansion water tank is connected with the suction port of the circulating water pump, the change of the installation height of the expansion water tank can meet the minimum pressure required by the suction port of the water pump.

3、 Installation of booster pump

If the installation site is a high-rise building with low water pressure, consider installing booster pump in the water pipeline. When selecting and installing the pump, please consider that the pump interface is the same as the tap water interface.

1. Installation position of water pump

Booster pump is generally installed behind the domestic water meter, that is, when the water meter comes out, it can also be installed in front of the gas water heater inlet. When installing the hot water outlet, the hot water pump shall be selected, and the temperature resistance shall be above 85 ℃.

2. Installation of water pump

Remove the cold water valve at the water heater inlet, install a booster pump (two self-propelled screws are fixed on the wall) at the appropriate position at the lower right corner of the water heater, and connect the water pump to the cold water outlet pipe of the water heater with a metal hose or aluminum plastic hose; generally, the external hydraulic switch is connected to the inlet section of the booster pump, and the connection direction must be indicated with an arrow according to the instruction. The automatic booster pump does not require the installation of an external hydraulic switch.

3. Precautions for water pump installation

Before installing the diesel engine water pump, carefully read the installation and operation instructions, and install according to the requirements of the instructions.

Check the power data on the pump nameplate to confirm that the pump is suitable for power supply and the socket is grounded reliably.

Connections in the pump's junction box can only be made when the power is off.

The hot water pump shall be installed on the pipeline where the liquid flows upward.

Previous：Diesel engine fire pump installation instructions Next：Types of diesel engine water pump and factors affecting the

Recommended products

Product Center

Long shaft fire pump

Long shaft fire pump Product Brief XBD / g-hrzl axial flow deep well fire pump (long shaft deep well f...