Multistage Single Suction Centrifugal Pump DG Series

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General Description

DG horizontal Multi-stage boiler feed pump can delivery clear water without solid particles or other liquid which the physical and chemical feature is similar with clear water. It is suitable for boiler feed water or deed water for high pressure boiler. The temperature range of the liquid is from -20℃ to150℃, and the inlet pressure is not allowed more than 0.6Mpa.

Performance range  
Capacity : 3.75~ 288m3/h
Head :  50 ~ 1540m

Instruction of pump type
For Example  DG25-80X10
DG — Single-suction, multi-stage, boiler feed pump.
25 — Pump capacity 25 m3/h.
80 —Single-stage head of pump 80m .
10 — pump stage number is 10.

Structure
DG series pump is single casing segmental multi-stage centrifugal pump, the main parts is stator, rotor, bearing and shaft.
Stator part: it mainly consists of suction stage, mid-stage, discharge stage and diffuser; they are strained through a lever and form a working chamber. The inlet and the outlet are vertical upward. The combined surface between each stage is sealed through metal surface and also with sealing o-ring as auxiliary seal.

Rotor part: it mainly consists of shaft, impeller, and balance drum and shaft sleeve. Shaft transfers power to impeller and make it work. The axial force is balanced by balance disc and there is rechargeable shaft sleeve to protect shaft.

Bearing part: It mainly consists of bearing body, shaft cover and sliding bearing. There are two single centripetal ball bearings in bearing body to prevent balance disk from abrasion. The sliding bearing is lubricated by dilute oil, there is cooling chamber in bearing body and the bearing can be cooled with exterior water.

Shaft seal part: shaft seal uses soft packing seal. It mainly consists of seal box, packing, packing ring and packing cover. The shaft is sealed, cooled and lubricated by exterior water from seal chamber. The mechanical seal can also be used as requirement and it need be cooled, lubricated and washed by exterior water.

Drive: Pump is directly driven by motor through flexible coupling. View from motor end, the rotating direction of pump is clockwise.

Material of main parts  
The medium-contacting parts are made of cast iron .

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Q:25KW what is the lift of the pump?
Give you a formula for estimating the power of a pump:N=Q (L/s), *H (m), /102/ (0.6~0.85), /0.85Explanation is:N, the power unit is kW (kW)Q, flow, in units per liter (L/s)H, the lift is m102 is 1000/g, G, that is gravity acceleration, is a unit conversion0.6~0.85, the efficiency of the pump, the general flow of large values, small flow of small value;0.85, power factorIn addition, there are some general power pump module, since there are: 1.1kW, 2.2kW, 3kW, 4kW, 5.5kW, 7.5kW, 11kW, 15kW, 18.5kW, 22kW, 30kW, 37kW, 45kW, 55kW, 75kW, 90kW, 110kW, 132kW......And generally there is no 25kW pump.
Q:Why does the water pump leak?
Two reasons.One is that the gap between the bearings becomes larger. Damage the water seal. One is the aging of water seal.
Q:What is the influence of the speed of the pump motor on the pump?
The question is very general,In general, high speed motors are used in 2 stages, 2900 revolutions per secondLow speed motor with 4 stage, 1450 revolutions per secondYou can probably generalize to thisWith the flow, head, run the pump speed type low noise will be reduced but the service life of the motor (relatively high speed), but the speed of price ratio low speed expensive (motor level 4 level 2 line than for more than copper)For example, it seems that the reason why turtles live longer is that their heart rate is slow.
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:What will the water pump reversal situation?
Reversal will also water out, but the amount of water is small, belong to "pressure water" effect, as if a basin of water, we do not shoot outward and down, the water will be out of the basin.
Q:What are the quota items for the complete pump installation?
It can be divided into the following sections:1. pump installation platform, to obtain concrete and reinforced section (if any)2. anchor bolt installation: cap construction reserved bolt mounting holes of the anchor bolt installation hole grouting taking, (may be incorporated into the 1), and the damping piece related item;3. pump installation: installed in the installation of fixed item taking pump, check the wiring and debugging section, the first cable.The above is only a rough expression, the specific problems are flexible.If you still don't understand, you can contact me.
Q:What is a 1 inch water pump?
A pump with a diameter of 1 inches.
Q:Is the motor with a pump a squirrel cage induction motor?
Not necessarily, mussaurus main motor and conventional motor rotor winding is the difference of mussaurus, can be in series with other equipment, to achieve more functionality!
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:Three phase water pump rated power 4000W, is three-phase working water pump, the voltage is 380V, how to find the three-phase pump current, and calculation of public
Three phase water pump motor rated power 4000W is the output shaft power, divided by the motor efficiency (general 85%) is the input power, which is often mistaken. The electric power is =4000/0.85=4706WRated current = electric power /1.732x, rated voltage x, power factor =4706/1.732x380x0.8=8.94A (assuming power factor 0.8).The above three answers are all wrong.

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