What Is a Boiler Feedwater Pump?

Boiler feed pump, DG type horizontal single-suction multi-stage segmented centrifugal pump are used to transport clear water and liquids with physical and chemical properties similar to water. DG25-80, DG45-80, DG85-80, DG150-100 in this model;

Boiler feed pump

Boiler feed pump, DG type horizontal single-suction multi-stage segmented centrifugal pump are used to transport clear water and liquids with physical and chemical properties similar to water. DG25-80, DG45-80, DG85-80, DG150-100 in this model;

The boiler feed pump has a flow of 25-150m3 / h and a head of 480-1100m. It can transport high-temperature fresh water below 280 , which is suitable for boiler feed water, factory and city water. It is suitable for transporting clean water with a temperature below 110 ° C or other non-corrosive liquids whose physical and chemical properties are similar to water. It is widely used in boiler water and urban domestic water supply for industrial and mining enterprises. DG series pumps are particularly suitable for boiler feed water, and can also be widely used in pressure vessel water supply, hot water circulation, high-rise building water supply, farmland irrigation, fire booster, hydraulic flushing, food, brewing, medicine, chemical, aquaculture, environmental protection And other industries.

Chinese name

Boiler feed pump

Foreign name

The boiler feed water pump

Sexual performance

High temperature and pressure

Type

DG

Material

Cast steel

I. Must see operating specifications

Warning : Violation of operating procedures and habits may cause personal injury or death

Caution: Violation of operating procedures, habits, etc. may cause damage to the equipment

Note: Operating procedures, conditions, etc. should be given great attention

Assembly and disassembly of the pump

1. Pump assembly The quality of the assembly of this DG pump directly affects the normal operation of the pump, and affects the service life and performance parameters of the pump; it affects the vibration and noise of the unit, and the following points should be noted during assembly:

a,

The suction port and the discharge port of the pump are vertically upward, and the axial force of the rotor is balanced by a balance disk. The shaft seal can be a packing seal or a mechanical seal. Only DG85-80, DG85-67, and DG155-67 are supported by the rotor with sliding bearings and thin oil lubrication. Other pumps use rolling bearings.

1.Pump housing part

The pump housing part is mainly composed of bearing body, front section, middle section, rear section, guide vane, etc. bolted together, the midline of the front inlet is horizontal, and the outlet of the rear is vertical.

2. Rotor part The rotor part is mainly composed of shaft and impeller, shaft sleeve, balance plate and other parts installed on the shaft. The parts on the shaft are fastened with a flat key and a sleeve nut to make it integrated with the shaft. The entire rotor is supported on the pump housing by bearings at both ends. The number of impellers in the rotor part is determined by the number of pump stages.

3.Bearing section

This type of pump bearing has two types of sliding bearing and rolling bearing, depending on the model, they do not bear axial force. The pump should allow the rotor part to move axially in the pump housing during operation. Radial ball bearings cannot be used.

4.Seal of the pump

The sealing surfaces between the front, middle, and rear sections of the pump are sealed with molybdenum disulfide grease. The seal between the rotor and the fixed part is sealed by a seal ring, guide vane sleeve, and packing. When the seal ring and guide vane sleeve are worn, Replace the pump when it has affected the operation and performance of the pump.

When using this type of pump, the position of the packing ring should be placed correctly. The distribution of the packing and packing ring of each type of pump is shown in Table 2. The tightness of the packing must be appropriate. It is advisable that the liquid can seep drop by drop.

6, curve interpretation

Note: The graph is a single-stage performance. The nominal diameter of the impeller is D2 = 134, and the speed n = 2950r / min. When the number of stages increases, the head increases proportionally, and the flow rate does not change. For example: the lift found in the curve of the level 3 is 3, the level 4 is 4, and so on.

Performance parameters of DG boiler feed pump

model	series	Flow Q	Head (M)	Rotating speed (R / min)	Motor Power (KW)
m3 / h	L / S
D-50 type	2	18	5	19	2900	2.2
3	18	5	28.5	2900	3
4	18	5	38	2900	4
5	18	5	47.5	2900	5.5
6	18	5	57	2900	5.5
7	18	5	66.5	2900	7.5
8	18	5	76	2900	7.5
9	18	5	85.5	2900	7.5
10	18	5	95	2900	11
11	18	5	104.5	2900	11
12	18	5	114	2900	11
D-80 type	2	32.4
3	32.4	9	34.05	2900	5.5
4	32.4	9	45.4	2900	7.5
5	32.4	9	56.75	2900	7.5
6	32.4	9	68.1	2900	11
7	32.4	9	79.45	2900	15
8	32.4	9	90.8	2900	15
9	32.4	9	102.15	2900	15
10	32.4	9	113.5	2900	18.5
11	32.4	9	124.85	2900	18.5
12	32.4	9	136.2	2900	18.5
D-100 type	2	54	15	35.4	2900	11
3	54	15	52.8	2900	15
4	54	15	70.4	2900	18.5
5	54	15	88	2900	twenty two
6	54	15	105.6	2900	30
7	54	15	123.2	2900	37
8	54	15	140.8	2900	37
9	54	15	158.4	2900	45
10	54	15	176	2900	45
11	54	15	193.6	2900	55
12	54	15	211.2	2900	55
D-125 type	2	108	30	40	2900	twenty two
3	108	30	60	2900	30
4	108	30	80	2900	37
5	108	30	100	2900	45
6	108	30	120	2900	55
7	108	30	140	2900	55
8	108	30	160	2900	75
9	108	30	180	2900	75
10	108	30	200	2900	90
11	108	30	220	2900	90
12	108	30	240	2900	110
D-150 type	2	162	45	54.6	2900	37
3	162	45	81.9	2900	55
4	162	45	109.2	2900	75
5	162	45	136.5	2900	90
6	162	45	163.8	2900	110
7	162	45	191.1	2900	132
8	162	45	218.4	2900	160
9	162	45	245.7	2900	160