D & DG Horizontal Multistage centrifugal pump

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Shanghai
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TT OR LC
Min Order Qty:
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Supply Capability:
10000 set/month

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Product Description:

The pumps are of horizontal and segmental type construction. The shaft is subcritical. For improving the cavitation behaviour the impeller of the first stage is provided with an enlarged entrance area. End thrust is balanced by balance disk. The impeller only with suction side wear ring.
The rating of the balance disk ensures complete hydraulic balancing of the thrust forces in all of the performance range. The rotor is supported by roller bearing in two ends.

Application:
Water plant General industrial services
Pressure booting Mines
Boiler feed Fire fighting
Sea water

Performance range:
Capacity Q up to 2000m3/h
Head H up to 1200m
Temperature T up to 120

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Q:Sewage treatment plant design how many pumps should be selected, head how to calculate the maximum design flow is 833M3/h
Pump selection to consider the flow, lift, diameter and power, but also with reference to the actual workload, the design quantity is 1666, how much can actually achieve? Head to refer to pipe length, height difference, elbow number, such as flow in more than 800 of the pump, lift at 35 meters, can generally meet about 200 of the pipeline work needs.
Q:Pump pumping small is what happened?
Water pump pumping is small because of insufficient water source or pump head is not enough. At the outlet stop to measure the pressure, if there is a certain pressure, that is, the flow is too small, if there is no pressure, that is not enough head, or both small.A pump is a machine that transports liquids or pumps liquids. It will be the prime mover of the mechanical energy or other external energy transfer to the liquid, the liquid energy increase, mainly used to transport liquids including water, oil, alkali liquid, emulsion, suspension emulsion and liquid metal, but also transport liquid, gas mixtures and liquids containing suspended solids. Pump performance parameters include flow, suction, lift, shaft power, water power, efficiency and so on.
Q:Does the IP55 indicate the lift on the water pump nameplate?
IP is INGRESS PROTECTION, that is, protection level,IP protection class is composed of two numbers, first numbers, from the lighting level to prevent intrusion of foreign objects, second numbers represent the tightness of anti moisture, waterproof lamp intrusion, the larger the number the higher the level of protection.Therefore, the pump IP refers to the pump with its own motor dust and waterproof level
Q:Pump suction and pressure side road why should vacuum table and pressure gauge, and what role they have?
The vacuum meter is used to measure the vacuum degree of the water pump before the water pump pumping, and to a certain degree of vacuum, the water can be sucked into the upward pressure position of the pump.A pressure gauge is used to indicate that the pumping is pressure in the pipe. The size of the pressure is related to the lift head, pipe diameter, atmospheric pressure and so on.
Q:Water pump eliminates air
First of all, why should exhaust air, pump suction principle is the rotation of the impeller, pump water inside the throw out, and then let the inlet pipe into a vacuum. Then, under the influence of atmospheric pressure, the water pressure is pumped into the pump. Therefore, if the water is not filled, the sealing of the pump is impossible to pump the air inside the evacuation of high vacuum. In other words, do not fill the water, you can not smoke water. You can hear the noise in the pump when the water bubbles under the bottom vacuumThe water doesn't go up because it doesn't have enough vacuum!The reason 1 is because there is no water filling,2, because your pump and water vertical height higher than the pump itself suction stroke.3., the pipeline resistance is too large (including the pipe diameter is too small, elbow and so on)
Q:What is the function of the backflow pipe of the fire pump?
Generally, it is used to test the fire pump. The procedure is to start the fire pump - turn on the return pipe - return the water to the pool. The purpose of the installation is to prevent damage to the pipe caused by the excessive pressure caused by the pump.
Q:Explore the flow of water pump production process is like?
You should go to the water pump factory visit, than to a vivid books. General settings are specific parameters - three view - model making - modification - Roughing - semi finishing - finishing - material quenching - heat treatment - carburizing - Black - assembly - spray painting - Inspection - Labelling - packaging.
Q:Should the no-load power of the pump be equal to the rated power?
Not equal to.1. Calculate the shaft power of centrifugal pump:Pa = HQ P /102 KWType H - pump rated lift, m;Q - rated flow of the pump, m3/s;P -- medium density, /m3 kg;Efficiency -- pump rated conditions (ETA = ETA ETA ETA m h V, m -- h -- mechanical efficiency, hydraulic efficiency,ETA V - volume efficiency);Pa - shaft power under rated working condition of pump, KW.2, determine the motor powerP=KPa/.Among them, P--- motors are equipped with powerShaft power under rated condition of Pa-- pumpETA - pump drive efficiency, general pump is using direct drive 1.K-- original motive power margin coefficient (shaft power less than 15KW, 1.25; 15 Pa > 55KW, 55KW > 1.15;, 1.1)
Q:When using a frequency converter to adjust the pump, what is the relationship between the change of the speed and the efficiency of the pump?
First, the wind pumps such load is usually called square torque load, which is in a certain range of speed and torque is roughly proportional to the square of the speed of N, TL=kn^2, power and speed is proportional to the cube, the energy-saving effect is obvious. Can also be described according to what you pump model, the pump is divided into piston pumps, screw pumps, impeller pumps and centrifugal pumps.Secondly, under the standard condition, the higher the efficiency of the centrifugal pump, the higher the speed determines the size of the centrifugal force, the higher the speed, the greater the centrifugal force, and vice versa. Plunger pump and screw pump is not the same, the speed of speed and efficiency basically no impact. Third, in addition to buying the pump, you can let the manufacturer give you an FM curve, so you can see the frequency of mediation when the water pump efficiency changes
Q:How do I know the pump pressure?
That is, the rated pressure minus the pipe loss, and then less inlet pressure (generally suction pump inlet pressure is negligible), that is the working pressure.The head of a centrifugal pump is also called the pressure head of a pump. It is the energy gained by the pump of the unit weight and the fluid. Pump head size depends on the structure of the pump (such as the diameter of the impeller, the bending of the leaves and so on, speed. At present, the pressure head of the pump can not be calculated accurately in theory, usually measured by experimental method.

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