Name: GDL pipeline multi-stage centrifugal pump
Brand: Yongjia Quanda Pump and Valve Manufacturing Co., Ltd
Availability: InStock

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18968989982
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Modao Industrial Zone, Oubei Town, Yongjia, Wenzhou, Zhejiang Province

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GDL pipeline multi-stage centrifugal pump

Flow rate: 2-160m3/h; Head: 24-200m; Power: 1.1-90kw; Speed: 2900r/min; Caliber: 25-150; Temperature range: -15-+120 ℃; Work pressure: ≤ 2.5Mpa.

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Product details

The GDL pipeline multi-stage centrifugal pump is a new generation product designed and manufactured by our company based on excellent pump types abroad, combined with user requirements and relevant fire safety standards, and according to JB/TQ6435-92 standards. The suction and discharge ports of the GDL type multi-stage centrifugal pump are located on the same straight line. The rotor components consist of shafts, impellers, impeller sleeves, shaft sleeves, and other parts. The inlet, middle, and outlet sections are connected by tension bolts. The shaft seal adopts mechanical seal and is lubricated and cooled with pressure water from the balance chamber. It is the best pump type for transporting hot and cold water or liquids with physical and chemical properties similar to water in various industries.

Main applications of GDL type pipeline multi-stage centrifugal pump

GDL type multi-stage centrifugal pumps are particularly suitable for boiler feedwater, and can also be widely used in various industries such as pressure vessel water supply, hot water circulation, high-rise building water supply, farmland irrigation, fire boosting, hydraulic flushing, food, brewing, medicine, chemical industry, aquaculture, environmental protection, chemical process and machine tool matching, as power equipment for water supply and drainage.

Selection criteria for GDL type pipeline multi-stage centrifugal pump

1. GDL type pipeline with multiple levelscentrifugal pumpUsed for transporting clear water or liquids with physical and chemical properties similar to clear water;
2. There should be no solid particles, fibers, strong corrosiveness, or explosion hazards in the transported liquid;
3. The maximum liquid temperature shall not exceed 120 ℃;
4. The maximum working pressure shall not exceed 2.5MPa;
5. The power supply is 3-phase 380V, 50HZ. Voltage fluctuation within ± 5%;
6. The ambient temperature should be below 40 ℃ and the relative humidity should be below 95%.

Internal structure of GDL pipeline multi-stage centrifugal pump

1	pump body	11	coupling
2	Tension Bolt	12	Connecting seat
3	outer cylinder	13	valve
4	impeller	14	mechanical seal
5	Impeller sleeve	15	axle
6	shaft sleeve	16	middle
7	seal pad	17	Shaft sleeve nut
8	nut	18	bearing shell
9	melt	19	Return pipe components
10	electrical machinery

GDL type pipeline multi-stage centrifugal pump model description

Selection parameters of GDL type pipeline multi-stage centrifugal pump

model	series	internet traffic (m3/h)	lift (M)	rotational speed (r/min)	Motor Power (kw)	efficiency （%）	Required cavitation allowance (NPSH)	weight
25GDL2-12	3	1.4 2 2.4	36	2900	1.1	23 30 32	2.9	58
	4		48		1.1		2.9	62
	5		60		2		2.9	68
	6		72		2		2.9	72
	7		84		2		2.9	78
	8		96		2.2		2.9	82
	9		108		2		2.9	86
	10		120		3		2.9	98
	11		132		3		2.9	102
	12		144		3		2.9
	13		156		4		2.9
	14		168		4		2.9
	15		180		4		2.9
25GDL4-11	3	2.8 4 4.8	33	2900	1.1	32 42 43	2.9	58
	4		44		1.5		2.9	65
	5		55		2.2		2.9	72
	6		66		2.2		2.9	76
	7		77		3		2.9	86
	8		88		3		2.9	90
	9		99		3		2.9	94
	10		110		4		2.9	110
	11		121		4		2.9	114
	12		132		4		2.9
	13		143		4		2.9
	14		154		5.5		2.9
	15		165		5.5		2.9
model	series	internet traffic (m3/h)	lift (M)	rotational speed (r/min)	Motor Power (kw)	efficiency （%）	Required cavitation allowance (NPSH)	weight
40GDL6-12	3	4.2 6 7.2	36	2900	1.5	43 52 50	2.9	72
	4		48		2.2		2.9	78
	5		60		2.2		2.9	82
	6		72		3		2.9	92
	7		84		3		2.9	96
	8		96		4		2.9	112
	9		108		4		2.9	116
	10		120		4		2.9	120
	11		132		5.5		2.9	140
	12		144		5.5		2.9
	13		156		7.5		2.9
	14		168		7.5		2.9
	15		180		7.5		2.9
50GDL12-15	2	8.4 12 14.4	30	2900	2.2	49 57 55	3.5	113
	3		45		3		3.5	129
	4		60		4		3.5	149
	5		75		5.5		3.5	181
	6		90		5.5		3.5	190
	7		105		7.5		3.5	204
	8		120		7.5		3.5	212
	9		135		11		3.5	265
	10		150		11		3.5	273
50GDL18-15	2	12.6 18 21.6	30	2900	3	54 63 62	4.0	122
	3		45		4		4.0	142
	4		60		5.5		4.0	175
	5		75		7.5		4.0	189
	6		90		7.5		4.0	198
	7		105		11		4.0	252
	8		120		11		4.0	261
	9		135		15		4.0	280
	10		150		15		4.0	289
model	series	internet traffic (m3/h)	lift (M)	rotational speed (r/min)	Motor Power (kw)	efficiency （%）	Required cavitation allowance (NPSH)	weight
65GDL24-12	2	18 24 28.8	24	2900	3	54 63 62	4.0	122
	3		36		4		4.0	142
	4		48		5.5		4.0	175
	5		60		7.5		4.0	189
	6		72		7.5		4.0	252
	7		84		11		4.0	261
	8		96		11		4.0	280
	9		108		15		4.0	289
	10		120		15		4.0	20
	11		132		15		4.0
	12		144		18.5		4.0
80GDL36-12	2	25.2 36.0 43.2	24	2900	4	59 71 70	4.2	193
	3		36		5.5		4.2	227
	4		48		7.5		4.2	244
	5		60		11		4.2	292
	6		72		11		4.2	302
	7		84		15		4.2	322
	8		96		15		4.2	332
	9		108		18.5		4.2	365
	10		120		18.5		4.2	375
80GDL54-14	2	36 54 65	28	2900	7.5	62 73 71	4.0	218
	3		42		11		4.0	267
	4		56		15		4.0	287
	5		70		18.5		4.0	320
	6		84		18.5		4.0	330
	7		98		22		4.0	373
	8		112		30		4.0	400
	9		126		30		4.0	421
	10		140		37		4.0	432
model	series	internet traffic (m3/h)	lift (M)	rotational speed (r/min)	Motor Power (kw)	efficiency （%）	Required cavitation allowance (NPSH)	weight
100GDL72-14	2	50.4 72 86.4	28	2900	11	64 73 71	4.5	276
	3		42		15		4.5	298
	4		56		18.5		4.5	336
	5		70		22		4.5	381
	6		84		30		4.5	453
	7		98		30		4.5	466
	8		112		37		4.5	493
	9		126		37		4.5	582
	10		140		45		4.5	595
125GDL100-20	2	75 108 130	40	2900	18.5	65 74 72	4.5	292
	3		60		30		4.5	430
	4		80		37		4.5	463
	5		100		45		4.5	555
	6		120		55		4.5	640
	7		140		75		4.5	840
	8		160		75		4.5	855
	9		180		90		4.5	870
	10		200		90		4.5	955
150GDL160-20	2	108 162 194	40	2900	30	69 78 77	4.5	422
	3		60		37		4.5	452
	4		80		55		4.5	613
	5		100		75		4.5	820
	6		120		75		4.5	836
	7		140		90		4.5	922

Installation requirements for GDL type pipeline multi-stage centrifugal pump

1. When installing a GDL type multi-stage centrifugal pump, the weight of the pipeline should not be borne on the pump, otherwise the ring water pump will be easily damaged;
2. The motor of the GDL type multi-stage centrifugal pump is an integral structure that has been calibrated by the manufacturer before leaving the factory, so there is no need to adjust it during installation, making it very convenient to install;
3. Before installing the water pump, carefully check whether there are any hard objects (such as stones, iron sand, etc.) in the pump flow channel that affect the operation of the water pump to avoid damaging the overcurrent components during the operation of the water pump;
4. The foundation bolts must be tightened before installation, and the pump should be checked for looseness at regular intervals to prevent severe vibration during pump start-up and affect its performance;
5. For the convenience of maintenance and safety of use, a regulating valve should be installed on the inlet and outlet pipelines of the pump, and a pressure gauge should be installed near the inlet and outlet of the pump. For high head, in order to prevent water hammer, a check valve should also be installed in front of the outlet gate valve to cope with sudden power outages and other power loss accidents, so as to ensure that the water pump operates under optimal conditions and increase its service life;
6. Pumps used in suction applications should be equipped with bottom valves, and the inlet pipeline should not have too many bends. At the same time, there should be no water or air leakage to avoid affecting the suction performance of the pump;
7. To prevent impurities from entering the pump and blocking the flow path, a filter should be installed in front of the pump inlet to improve performance;
8. Before installing the pipeline, rotate the rotor components of the water pump without any friction sound or jamming phenomenon. Otherwise, the pump should be disassembled to check the cause.

Starting and stopping of GDL type pipeline multi-stage centrifugal pump

Preparation before starting
1. Pull and rotate the coupling by hand, and the impeller should have no jamming or grinding phenomenon, and rotate flexibly;
2. Open the inlet valve, open the exhaust valve to fill the entire pump chamber with liquid, and then close the exhaust nozzle;
3. When transporting hot liquids, preheating should be carried out before starting, with a heating rate of 50 ℃/h. The preheating of the pump is achieved by continuously circulating the transported liquid to ensure uniform heating of all parts;
4. The GDL type vertical multi-stage pump should be manually rotated a few times to allow lubricating water to enter the mechanical seal end face;
5. Tap the motor to confirm if the direction of rotation is correct.
Start up and operation
1. Fully open the inlet valve and close the outlet pipeline valve;
2. Connect the power supply, gradually open the valve on the discharge pipeline when the pump reaches normal speed, and adjust it to the desired working condition;
3. Pay attention to the instrument readings and check the leakage of the shaft seal. Normally, the mechanical seal leaks at a rate of 3 leaks per minute. Check that the temperature at the motor and bearings is ≤ 70 ℃. If any abnormal situation is found, it should be dealt with in a timely manner.
park
1. Gradually close the valve of the discharge pipeline;
2. Close the inlet valve;
3. If the ambient temperature is below 0 ℃. The liquid inside the pump should be drained completely to prevent the water pump from freezing and cracking;
4. If the pump is not used for a long time, it should be disassembled, cleaned, packaged and stored.

Maintenance and upkeep of GDL type pipeline multi-stage centrifugal pump during operation

1. The inlet pipeline of GDL type multi-stage centrifugal pump must be highly sealed, and there should be no water or air leakage;
2. Prohibit the long-term operation of GDL type vertical multi-stage centrifugal pumps under cavitation conditions;
3. Prohibit GDL type vertical multi-stage centrifugal pumps from operating under high flow conditions with motor overcurrent for extended periods of time;
4. Regularly check the motor current value during pump operation to ensure that the pump operates within the design operating range as much as possible;
5. GDL type vertical multi-stage centrifugal pumps should be supervised by dedicated personnel during operation to prevent accidents;
6. The bearings of the GDL vertical multi-stage centrifugal pump should be lubricated every 500 hours of operation;
7. After long-term operation, the GDL type vertical multi-stage centrifugal pump may experience increased noise and vibration due to mechanical wear, and should be stopped for inspection. If necessary, vulnerable parts and bearings can be replaced. The overhaul period for the unit is generally one year.

Maintenance and upkeep of mechanical seals for GDL type multi-stage centrifugal pumps

1. Mechanical seal lubricant should be clean and free of solid particles;
2. Mechanical sealing is strictly prohibited from working under dry grinding conditions;
3. Before starting, the GDL type vertical multi-stage centrifugal pump (motor) should be turned several times to avoid mechanical seal breakage and damage caused by sudden starting.

Reasons and troubleshooting methods for faults in GDL type pipeline multi-stage centrifugal pump

Fault phenomenon

Possible causes

Troubleshooting

1The water pump is not producing water

The inlet valve is not open, the inlet and outlet pipelines are blocked, and the impeller flow channel is blocked

The motor is running in the wrong direction and has a slow speed due to phase loss

Leakage of suction pipe

The pump is not filled with liquid and there is air inside the pump chamber

Insufficient imported water supply, high suction, and bottom valve leakage

Excessive pipeline resistance and improper pump selection

Check and remove blockages

Adjust the motor direction and tighten the motor wiring

Tighten all sealing surfaces and eliminate air

Open the pump cover or open the exhaust valve to exhaust all the air

Shutdown inspection and adjustment

Reduce pipeline bends and reselect pumps

2Insufficient water pump flow

Press first1Reason check

Pipeline, pump flow channel or impeller blockage, scale deposition……

Low voltage

Impeller wear

Press first1exclude

Remove the obstruction and readjust the valve opening

voltage stabilization

Replace the impeller

3Excessive power

Exceeding the rated flow usage

High suction distance

Pump bearing wear

Adjust the flow rate and turn down the outlet valve

reduce

Replace bearings

4Noise and vibration

Unstable pipeline support

Liquid mixed with gas

Generate cavitation

Bearing damage

Motor overload operation

Stable pipeline

Increase suction pressure and exhaust

Reduce the vacuum degree

Replace bearings

Adjust according to5

5Motor heating

Excessive traffic and overloaded operation

local friction

Motor bearings damaged

under voltage

Close the outlet valve

Check and exclude

Replace bearings

voltage stabilization

6Water pump leakage

Mechanical seal wear

The pump body has sand holes or cracks

Uneven sealing surface

Loosening of installation bolts

replace

Welding repair or replacement

trim

fastening

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