Sewage Submersible Pump WQ Series

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General Description
Type CRQW submersible sewage pump is newly developed on the basis of the advanced technology from international. Is used for industry and commerce, the living area,urban sewage treatment plant, waterworks,civil air-defense construction,hospital,hotel and so on. They can also be used in public works, explore, country methane, irrigation, deliver water with impurity. The flow-rate range of the delivery water is 7-10000m3/h, lift range is 7-60m,power range is 0.55-315KW, caliber range is φ25-φ700 mm.

Service conditions
* Medium temperature should not above 60℃, Maximum density is 1.3×103kg/m3.
* If the pump without a build-in self-circulation cooling system, its motor should not expose above water more than half.
* Deliver medium’s PH value is between 4 and 10.
* Solid particle passing capacity is 60% of the inlet diameter, the length of the fiber is 5 times to inlet diameter.

Instruction of pump type
Example: 100CRQW100-15-7.5
100 in the front: Pump outlet diameter is 100mm
CR: Company code, means produced by CREDO PUMP
QW: Submersible sewage pump
100 after: Flow capacity 100m3/h
15: Head is 15m
7.5: Motor power is 7.5KW

Structure

*Type CRQW Submersible Sewage Pump adopts particular single blade or double blade; advance the ability for get across feculence. Fiber about 5 times as pump caliber can across.
*Mechanical seal adopt fresh model cemented carbide rot-proof material, and at the same time, we improved on the airproof to the single-ended double-face mechanical seal, let them work in oil chamber for a long period of time.
*The whole structure is compact;, volume is small, little noise and the energy saving result was apparent. The machine needn’t pump room .It can work just dinning into water, so reduce project cost.
*According to need, we can equip safety protection control cupboard to protect the pump, advanced the safety and reliability.
*The float switch can control automatically, do not need specially-assigned person. It’s very convenient.
*According to need, we can equip automatic coupler installation system. So people needn’t get into the drainage ditch.
*Can be used in all the range of lift ,and it won’t overload.
*There are two different install way, fixed type automatic installation system and movable type automatic installation system.

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Q:What does "ETA" mean in the selection of pumps?
NPSH refers to the cavitation, the pump is the technical parameters
Q:Who can tell me such water pump medium flow direction should be what kind of, from left to right, or from right to left, is low into the higher?
In the picture, to the right is the entrance, the left is the exit, the water pump inlet channel section area generally will be bigger than the export.
Q:Water pump motor often inlet
I don't know what the pump is upstairsThe ordinary centrifugal pump inlet outdoor installation, in order to prevent the motor fan end can be installed in the end of 0.5 with the maple leaf canopy, the sheet can be, the supporting leg can be installed in the wind leaf cover screws; if your motor output is water, and the output end of the motor bearing can be installed with the same motor shaft the outer diameter of the rubber water retaining ring (the market for rubber seal should be easy to buy)Submersible pump (pump) often water, you should consider replacing the good points of the mechanical seal, such as to choose oil resistant, acid and alkali resistant, selected according to the transmission medium and the pump itself, if you can confirm the correct, check whether the pump shaft bending, made into concentric mechanical seal damage. And check whether the casting on the motor side is defective or not;Choose a higher level of protection of sewage pump, preferably in the pump leakage probe, float switch, overload, lack of protection, generally will not burn the motor
Q:Level 200 meters distance, elevation 30 meters, how much lift water pump?
According to the horizontal distance of 10 meters is 1 meters lift, 200 meters is 20 meters and 5 meters height difference of 30 Mega elbow, pump head floating down 10%, should be about 60 meters.
Q:Power flow conversion of water pump
Upstairs in Wurenzidi, pump power is related to the flow and the head, a simple formula: = /367 * power flow lift efficiency
Q:What is the reason for the overload of the water pump indicator?
Hello friend, pump overload shows that the water pump current increases, the power supply phase and water pump load becomes larger.
Q:How many pumps does a 50 meter water head use?
Deep well submersible pump head = dynamic water level to pipe outlet height + outlet pressure + hydraulic loss along courseTherefore, it is necessary to provide the dynamic water level of the well, the required flow rate, the pipe diameter, and the vertical height of the wellhead to the highest point, so as to estimate the pump head.
Q:Safety head of water pump?
The pump achieves this by providing sufficient energy to the liquid at the entrance of the impeller, and ensuring that the liquid remains liquid. This energy is known as the available cavitation margin, referred to as NPSH (A).If there is not enough NPSH (A) or energy, as soon as the liquid enters the impeller, its velocity is increased. According to Pohl's law, the pressure drops. A reduction in pressure will cause some molecules in the liquid to become gaseous, forming vapor bubbles.The performance of the pump will be lowered immediately and the bubbles will continue to grow until the pressure inside the pump causes them to implode.In brief, it is to avoid cavitation.
Q:Why is the water pump usually used multi-stage pumps, while the circulating pump is usually a single-stage pump?
The circulating pump is usually used in the closed-loop system, circulating pump will be generated when the pump pressure, the pressure is also said, and the suction pump up is in normal pressure system, the outlet of the closed-loop system, when the system pressure is 0.1MPa, the water pump for water system needs higher than 0.1MPa, the difference of pressure difference the greater the water faster, on the contrary, the smaller the slower the pressure difference; so the normal work must want water pump outlet pressure is greater than the system pressure. The replenishment pump is usually multi-stage pumps, and circulating pumps are usually single pump is wrong, as long as the replenishment pressure difference to meet the requirements, multi-stage pumps and single-stage pumps are not affected.(single stage pump and multi-stage pump difference: 1, single-stage pump water level "is a wheel is a level", an impeller, no other brothers and sisters for help; and a plurality of multi-stage pump impeller, there are brothers and sisters for its help, so that his ability to work is high. Just as a man works alone and a lot of people work together, the work is differentTherefore, as long as the design requirements are met, it is not important to select multi-stage pumps and single-stage pumps.
Q:Pump power ratio design is small, the problem is big?
The flow is 20 L/S! Q = 20, L/S = 0.02 m^3/SThe total efficiency of the pump and the motor is estimated to be 60%P=pgHQ/n=1000*9.8*90*0.02/60%=29400W= 29.4, KWLook at the water pump motor power 30KW just enough from the calculation, but there is no room for the use of the attention do not overload!(Note: motor power matching pump nameplate are generally too large, room.)

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