Smart purchasing hand lift fire pump

The hand-lifting mobile fire pump is referred to as the hand-lift pump. It is a fire pump that is directly connected with a light engine and a water pump and can be lifted and moved by human power. Due to its light weight, small size, and ease of use, it is seldom restricted by obstacles such as traffic, electricity, and regional restrictions, and thus has a wide range of use. It is a poor condition for firefighting forces and roads in towns, enterprises, ports, wharfs, and rural areas. One of the important fire-fighting equipment in the area.

For regions with underdeveloped traffic and lack of water resources, it is a compulsory course for fire fighters in the region to properly purchase and standardize their use, and to give full play to the role of hand-lifting pumps.

The main factors affecting the performance of hand-carried fire pump:

When the purchaser decides to purchase fire-fighting pumps, the parameters such as engine size, maximum pressure, water absorption time, start-up mode, and maximum flow rate must be taken into consideration as a priority. However, there are the following parameters that you may ignore:

1 , the size of the inlet and outlet

2 、absorbing system

3 , nominal performance

4 , engine type

These parameters will absolutely affect your judgment of the fire pump!

How do they affect the performance of the pump, let's analyze them one by one:

1 , the size of the inlet and outlet

The maximum flow rate of the pump is one of the parameters most valued by the fire purchaser. However, the maximum flow of the pump is closely related to the size of the outlet and the inlet. If the design of the inlet and outlet is unreasonable, the flow at the outlet is always greater than the flow at the inlet, so the pump cannot reach the expected maximum flow.

2 、absorbing system

In theory, the self-priming height can reflect the water pump's water absorption system to a certain extent. The higher the self-priming height, the stronger the water absorption capacity. However, due to the effect of Earth's gravity and based on current human science and technology, the maximum water absorption height of any pump is limited to 9 meters. At present, the majority of fire-fighting pumps on the market have a water absorption height of about 7 meters. Therefore, blindly pursuing the maximum suction stroke does not have any effect in actual operation. The pump self-priming system is the biggest factor that really determines the water absorption performance of the pump.

3 , nominal performance

The nominal performance is the most reliable data obtained from numerous product experiments during the production process. According to international practice, the nominal performance of a pump is usually the flow and pressure generated at a self-priming height of 3 meters.

The correct representation of nominal performance: flow ( L/min) @ pressure ( bar ) @ 3m .

Nominal performance is a key indicator of the performance of a pump. When the purchaser faces several fire pumps with different parameters, it must first be determined that the parameters are in the same product range as the several fire pumps that are bidding. such as:

A brand gives a nominal performance of 750L/min@10bar@3m ;

Product B offers three nominal performances of 375L/min@12bar and 750L/min@10bar.       1200L/min@6bar ;

The nominal performance given by the C brand is 1000L/min@8bar@3m .

It can be seen that the nominal performance marked by each brand is not uniform, and the flow under different pressures is not the same and it is impossible to compare!

Don't worry, the highlight is coming!

Fire pump procurement process must require manufacturers to show the flow pressure parameter curve table.

The flow pressure parameter curve provided by the A brand is as follows:

B brand flow pressure parameter curve table.

B brand can not provide flow pressure parameter curve table, but we can accurately draw the flow pressure parameter curve table according to the three coordinate points provided by B brand according to the theory of junior high school coordinate system.

C brand flow pressure parameter curve table:

The hand-lifting mobile fire pump is referred to as the hand-lift pump. It is a fire pump that is directly connected with a light engine and a water pump and can be lifted and moved by human power. Due to its light weight, small size, and ease of use, it is seldom restricted by obstacles such as traffic, electricity, and regional restrictions, and thus has a wide range of use. It is a poor condition for firefighting forces and roads in towns, enterprises, ports, wharfs, and rural areas. One of the important fire-fighting equipment in the area.

Second, we need to choose a quantitative. This ration can be flow or pressure. Here, "the fire front" pressure as a parameter, as the constant criterion selected 7bar. According to the above icon you can see:

At a pressure of 7bar , the flow of the A brand is 1200L/min@7bar

The B brand flow rate is 1000L/min@7bar

The C brand's traffic is 1150L/min@7bar

Conclusion: Smart purchase, don't forget to ask the manufacturer for the nominal pump performance and flow pressure parameters!

1. Engine type four stroke Vs two stroke

Both strokes and four strokes have their own advantages and disadvantages. The number and weight of components in a two-stroke engine is nearly 30% - 50% lower than that of a four-stroke engine , so the two-stroke engine is light and inexpensive. However, this is equivalent to comparing QQ car materials with BMW car materials. The two-stroke engine has a relatively thin material, which results in the two-stroke engine being easily damaged. Although the price of the two-stroke water pump is relatively low as a whole, in the long run, the expensive parts greatly increase the maintenance cost of the two-stroke engine.

Although the four-stroke fire-fighting water pump has lost its weight advantage, four strokes (intake, compression, workmanship, and exhaust) are fully working, which greatly improves the performance of the engine, greatly reduces fuel consumption, and saves economic costs. And, due to the full combustion of fuel, the emission of pollutants from the engine is greatly reduced. Two-stroke engines are not allowed in the United States and most parts of Europe. As the world warms up today, choosing an environmentally friendly water pump is also a small contribution to the earth.

This article is an excerpt from "Fire Fighting Frontier" edited by China Rescue Equipment Network.