Cocamide DEA, or cocamide diethanolamine, is a diethanolamide made by reacting the mixture of fatty acids from coconut oils with diethanolamine. CDEA,Coconut Diethanolamide CDEA,CDEA For Washing Hand,Cocamide DEA 6501 Yucheng Jinhe Industrial Co.,Ltd , https://www.jinhetec.com
The requirements for the use of fire-fighting pumps are much higher than the requirements for the use of living pumps and production pumps. This not only satisfies the requirements for water pressure during fire extinguishing, but also satisfies the requirements for water volume. If you choose to use the fire because it can not reach the corresponding use requirements, resulting in unnecessary losses, it would not try it!
It can be seen how important it is to choose fire pumps carefully. When selecting a fire pump, first consider the process flow of the fire pump application, combined with the water supply and drainage requirements, from the following five aspects comprehensive considerations, respectively, as follows: liquid delivery volume, device lift, liquid properties, piping layout, operating conditions . At the same time according to the relevant data to determine whether the application requirements. The detailed fire pump discharge flow should be 150% of the flow rate when the selected site is used. The corresponding lift should preferably be greater than 65% of the selected site lift. Remember to close the pump after use. Because there is no hard requirement for the fire pump in the country at present, there are many differences in the selection of the fire pump.
Usually based on experience, you can easily select the fire pump. When selecting the type, pay attention to the head and flow to reach the specified range.
When the fire pump is in operation, it must be carried out strictly in accordance with the relevant operating regulations of the instrument in order to ensure safety and normal operation. Because the fire pump plays a key role in the fire protection system, a slight mistake can bring unexpected damage, especially when we encounter an emergency fire. In general, there are three main steps:
1. Main and standby switching methods of fire pumps From the point of view of the collection and control of fire pump start signals, there are mainly two methods for the main and standby switching of fire pumps in design. The key is the choice of control signal source. It can be divided into current signal control method and pressure signal control method. Normally, the main and standby pumps of the fire pump need to be designed in a mutually redundant manner.
The current signal control method is a common method for the main and standby switching of the fire pump in the current fire design. It judges whether the fire pump works by feeding back the motor current signal of the fire pump. When the motor is short-circuited (off) and the current is too high, the power supply automatically switches to the motor of another pump unit, stopping the work of the first fire pump and starting another fire pump.
Of course, the principle of electrical fire pump control can be arbitrarily designated a fire pump as the main pump or standby pump. The current signal control method is the earliest and most used in the country at present, and the pressure signal control method is used in the foreign automatic sprinkler system. The pressure signal control method provides a reliable method for the automatic control of the fire water supply system.
2. Comparison of main and standby switching methods 2.1 Causes of failure of fire pump The final result of the failure of the fire pump is that the fire pump cannot normally supply water. The main causes of fire pump failure can be divided into two categories, one is motor failure, and the other is water pump failure.
2.2 Analysis of main and standby switching methods for fire pumps The current signal control method is used. Its advantage is that it can timely reflect the failure of the motor. The fault of the motor is also the main fault of the pump unit. However, this method does not explain whether the fire pump actually effluent.
2.3 Comparison of the two control methods The current signal control method and the pressure signal control method are the main and standby switching methods of the fire pump. Fire pump control requirements are the same, and the two methods have different signal acquisitions and the final control results are different.
2.4 The pressure signal control method should pay attention to the problem (1) The electric node pressure gauge should be located in the fire main pump outlet pipe, should not be located in front of the fire pump valve.
(2) In the circuit design for signal control judgment, a certain time delay must be set for switching.
(3) Switching of the pressure signal control method The main pump or standby pump of the fire pump can be arbitrarily designated, and can also be periodically switched.
(4) In addition to the automatic control of the fire pump, there should also be local control functions. Fire pump work signals need to be sent to the fire control center for monitoring, control and building automation records.
Fire pumps are the heart of firefighting water systems. In a firefighting water supply system, the provision of a fire pump can increase the safety of the entire system and improve the reliability of the entire fire water supply system. The fire water supply system should be provided with a standby fire pump. The main and standby switching of the fire pump is an important means to realize the investment of the fire backup pump, and is also an important part of the reliable and safe operation of the fire water supply system. Let's take a look at the main and standby switching methods for fire pumps.
Characteristics:
1.Excellent decontamination, wetting, dispersion, anti-hard water, and antistatic performances.
2.Perfect thickening, foaming, foam-stabilizing and derusting abilities.
3.Compounded with other anionic surfactants, such as LABSA, the foaming ability will be obviously improved, and foam is more affluent, stable, and long-standing. The washing effect is also enhanced.
Application:
1.Added in shampoo and hand washing, it can not only stabilize foam and thicken the liquid,
but also will reduce the irritation to the skin.
2.For it can soften fiber textile, it is especially suitable for washing animal fiber, such as hair and thread, etc.
3.Its applications are in liquid Detergent, shampoo, dishware detergent, liquid soap, fiber
modifier, wool cleanser and metal rinse, etc.
4.Also used in electric plating, shoe polish and printing ink, etc.
Fire pumps can be used as liquid fire extinguishing agents such as water and foam solutions. This shows the importance of fire pumps. Many people just superficially recognize the role of the fire pump, but are ignorant of the choice of the right type of fire pump. Here's to introduce how to correctly select the type of fire pump.