Changsha Zhonglian Pump Industry Co., Ltd.

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Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

GC-type horizontal multistage boiler feed pump

GC-type horizontal multistage boiler feed pump

Flow rate: 6–55 m³/h

Head: 46–430 m

Power: 3-100 kW

Efficiency: 38%–62.5%

Pump weight: 70-253 kg

Cavitation margin: 3.6–5.5 m

Price: 0.18–59,800

The GC-type pump is a horizontal, single-suction multistage, sectional centrifugal pump. It features high efficiency, a wide performance range, safe and stable operation, low noise, long service life, and convenient installation and maintenance. It is designed for conveying clean water or other liquids whose physical and chemical properties are similar to those of water.

Hotline:

+86 0731-88632200

classification：

Multistage pump

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

　　The GC horizontal multistage boiler feed pump is a horizontal, single-suction, multistage, sectional centrifugal pump. It features high efficiency, a wide performance range, safe and stable operation, low noise, long service life, and convenient installation and maintenance. This pump model is an older, obsolete type; the DG series of multistage boiler feed pumps and the high-temperature boiler feed pump series have been developed in accordance with national standards to replace the older GC series products. This series of boiler feed pumps is suitable for conveying clean water or other non-corrosive liquids with physical and chemical properties similar to water at temperatures below 110°C. They are widely used in industrial and municipal water supply and drainage systems, pressurized water supply for high-rise buildings, landscape irrigation, fire-fighting booster systems, long-distance water delivery, heating and cooling systems, bathroom hot-and-cold water circulation boosting, and equipment integration—particularly well-suited for small boiler feed applications.

　　Among boiler feedwater multistage pump manufacturers, the boiler feedwater pumps produced by Zhonglian Pump Industry are all designed and optimized using computer-aided methods. The company boasts strong technical expertise, extensive manufacturing experience, and sophisticated testing facilities, ensuring the consistent reliability of its products.

Product Features and Application Scope of GC Horizontal Multistage Boiler Feed Pumps

1. The hydraulic model is advanced, highly efficient, and features a wide performance range.

2. The pump operates smoothly with low noise.

3. The shaft seal adopts a soft packing seal, which is safe and reliable, features a simple structure, and is easy and quick to maintain.

　　The GC boiler feedwater pump is a type of multistage pump that can also be widely used in various industries—including water supply for pressure vessels, hot-water circulation, water supply for high-rise buildings, agricultural irrigation, fire-fighting boosting, hydraulic flushing, food processing, brewing, pharmaceuticals, chemical industry, aquaculture, environmental protection, chemical process engineering, and machine tool配套—as a power device for water supply and drainage.

Meaning of the Model Designation for GC Horizontal Multistage Boiler Feed Pumps

Structural Diagram of the GC-Type Horizontal Multistage Boiler Feed Pump

Troubleshooting for GC-Type Horizontal Multistage Boiler Feed Pumps

Failure	Reason	Solution
1. The pump is not drawing water, and the pointers on the pressure gauge and vacuum gauge are fluctuating violently.	There isn't enough water being pumped into the pump, and there are leaks in the pipes and instruments.	Inject more into the pump and tighten the area where the leak is occurring.
2. The pump is not drawing water, and the vacuum gauge indicates a high degree of vacuum.	The bottom valve is not open, or it’s already blocked; the suction pipe has too much resistance, and the suction height is too high.	Correct or modify the bottom valve condition. Or modify the suction pipe to reduce the suction lift height.
3. The pressure gauge shows pressure, yet the water pump still isn't delivering water.	The discharge pipe has too much resistance, the rotation direction is incorrect, and the impeller is blocked. The pump speed is insufficient.	Inspect the short water pipe and the inspection motor. Remove the pipe connector, clean the impeller, and increase the rotational speed of the pump shaft.
4. The flow rate is below the design requirements.	The pump is blocked. The sealing ring is excessively worn. The rotational speed is insufficient.	Clean the water pump and pipes, and replace the sealing rings. Increase the rotational speed of the pump shaft.
5. The pump is consuming excessive power.	The packing gland is too tight. The impeller is worn due to overheating of the stuffing box. The water supply from the pump has increased.	Loosen the packing gland. Replace the impeller. Increase the resistance in the discharge pipe to reduce the flow rate.
6. The pump makes unusual noises internally and fails to draw water.	The flow rate is too high, the resistance inside the suction pipe is excessive, and air is leaking into the suction area. The temperature of the liquid being pumped is too high.	Increase the resistance inside the discharge pipe to reduce the flow rate; inspect the pump and the piping. Check the foot valve, reduce the suction height, seal any air leaks, and lower the suction height.
7. Pump vibration.	The pump shaft and the motor are not aligned on the same centerline, or the pump bearing is bent.	Align the centerlines of the pump and motor shafts.
8. Bearing overheating.	Without oil, the pump and motor shafts are not aligned on the same centerline.	Keep going. Align the shaft centerline and inspect or clean the bearing housing.

Installation, Removal, Startup, Operation, and Shutdown of GC-Type Horizontal Multistage Boiler Feed Pumps

1. Loading and unloading sequence

1) Securely install the sealing ring <9> onto the water inlet section (8).

2) Pass the shaft <9>, fitted with bushing A <5> and key, through the inlet section <8> and push it into the impeller (10). Then, place a paper gasket on the middle section, install the middle section (11), and push in the second impeller. Repeat the above steps to assemble all the impellers and middle sections.

3) Install the balance ring (14) onto the discharge section (13).

4) Attach the effluent section <13> to the middle section, then use the tension bolts <18> to securely fasten together the inlet section, the middle section, and the effluent section.

5) Install the balance disc <15> and bushing B <17>.

6) Install the paper gasket onto the tail cover, then attach the tail cover to the water outlet section. Next, sequentially install the packing and packing ring (7) as well as the packing gland (6) into the packing chambers of both the water inlet section and the tail cover.

7) Install the bearing housing <4> onto the suction section and the tail cover respectively, and secure them with bolts.

8) Insert the ball bearings〈3〉 and secure them respectively with the shaft sleeve nut〈1〉 and the round nut〈20〉.

9) Insert an appropriate amount of grease into the bearing housing, place the paper gasket over the bearing cap (2), and then secure the bearing cap to the bearing housing using screws.

10) Install the return pipe, coupling components, and all square plug screws.

11) Disassembly should be performed in the reverse order of the steps described above.

Preparations before installation:

1) Inspect the pump and motor;

2) Prepare tools and lifting equipment;

3) Inspect the machine’s foundation;

2. Installation Sequence

1) The entire pump set, including the base, has been delivered to the site with the motor already installed. When leveling the base, there is no need to remove the pump and motor.

2) Place the base on the foundation, and insert wedge-shaped iron blocks near the anchor bolts to raise the base by approximately 20–40 millimeters, preparing it for leveling before filling with cement.

3) Use a level to check the horizontal base of the pedestal. After leveling it, tighten the anchor bolts and fill the base with cement.

4) After the cement has dried and hardened for 3-4 days, check the levelness again.

5) Clean off any dirt from the supporting surface of the base, as well as from the flat surfaces of the pump feet and motor feet. Then place the motor and pump onto the base.

6) Adjust the pump shaft to be水平. After achieving proper leveling, tighten the nuts appropriately to prevent any movement. Once adjustment is complete, install the motor. Place iron plates under areas that are not level, and leave a certain gap between the pump and the coupling.

7) Place a level on the coupling and check whether the pump shaft centerline coincides with the motor shaft centerline. If they do not coincide, place thin metal shims under the feet of both the motor and the pump to ensure that the outer circles of the two couplings are flush with the level. Then, remove some of the shims and replace them with a single, planed shim plate. Finally, recheck the installation to confirm that everything is properly aligned.

To check the installation accuracy, use feeler gauges at several opposite positions to measure the clearance between the two coupling planes. The difference between the maximum and minimum clearances around the circumference of the coupling planes must not exceed 0.3 millimeters, and the difference between the upper and lower or left and right positions along the centerlines at both ends must not exceed 0.1 millimeter.

3. Starting and Stopping:

1. Remove all oil from the shaft and other oil-coated parts.

2. Clean the bearing and shaft housing with gasoline, then wipe clean with cotton gauze.

3. Add calcium-based grease into the bearing housing.

4. Start the test. Turn on the motor and check the rotation direction of the motor. It is strictly prohibited for the pump to rotate in reverse, which could cause the sleeve nut to loosen.

5. Pour water into the pump or use a vacuum pump to draw water in.

6. Close the valve on the discharge pipe and the pressure gauge cock.

7. After the above process is completed, start the motor and open the pressure gauge cock.

8. When the pump is running at its normal speed, the pressure gauge should indicate the appropriate pressure. Then, open the vacuum gauge cock and gradually open the gate valve on the drain line until the desired pressure is reached.

9. When stopping the pump, slowly close the gate valve on the drain line and the vacuum gauge cock. Then stop the motor and close the pressure gauge cock.

10. When the pump is to be discontinued for an extended period, it should be disassembled, all parts thoroughly dried, and then properly stored after applying anti-rust oil to the sliding surfaces.

Operation:

1. Pay attention to the temperature of the pump bearing; it must not exceed the ambient temperature by more than 35℃. The maximum allowable temperature is 75℃.

2. While the pump is running, be sure to pay attention to adding lubricant regularly.

3. The normal leakage rate in the stuffing box should be about 10–20 drops per minute, and the tightness of the packing gland should be adjusted accordingly at all times.

4. Regularly inspect the coupling and pay attention to checking the temperature rise of the motor bearings.

5. During operation, if any noise or unusual sound occurs, stop the machine immediately and check the cause.

Product Parameters

GC-Type Horizontal Multistage Boiler Feed Pump Model Parameters

Model Parameters	Flow rate (Q)		Head (H)	Rotational speed (n)	Shaft power (Pa)	Equipped with a motor	Efficiency (n)	Cavitation volume	Pump weight
Model Parameters	m3/h	L/s	m	r/min	kilowatt	Power kW	%	m	kilogram
1.5GC-5×2	6	1.66	46	2950	2	3	38	3.6	70
1.5GC-5×3	6	1.66	69	2950	3	4	38	3.6	76
1.5GC-5×4	6	1.66	92	2950	4	5.5	38	3.6	89
1.5GC-5×5	6	1.66	115	2950	5	7.5	38	3.6	98
1.5GC-5×6	6	1.66	138	2950	6	7.5	38	3.6	107
1.5GC-5×7	6	1.66	161	2950	7	7.5	38	3.6	116
1.5GC-5×8	6	1.66	184	2950	8	11	38	3.6	125
1.5GC-5×9	6	1.66	207	2950	9	11	38	3.6	134
2.5GC-6×2	20	5.6	54	2950	6.2	11	47.4	5.2	172
2.5GC-6×2	15	4.2	62	2950	5.8	11	43.7	4.9	149
2.5GC-6×3	15	4.2	93	2950	8.7	15	43.7	4.9	172
2.5GC-6×3	20	5.6	81	2950	9.3	15	47.4	5.2	172
2.5GC-6×4	15	4.2	124	2950	11.6	22	43.7	4.9	187
2.5GC-6×4	20	5.6	108	2950	12.4	22	47.4	5.2	187
2.5GC-6×5	15	4.2	155	2950	14.5	22	43.7	4.9	202
2.5GC-6×5	20	5.6	135	2950	15.5	22	47.4	5.2	202
2.5GC-6×6	15	4.2	186	2950	17.4	30	43.7	4.9	217
2.5GC-6×6	20	5.6	162	2950	18.6	30	47.4	5.2	217
2.5GC-6×7	15	4.2	217	2950	20.2	30	43.7	4.9	232
2.5GC-6×7	20	5.6	189	2950	21.7	30	47.4	5.2	232
2.5GC-6×8	15	4.2	248	2950	23.2	37	43.7	4.9	247
2.5GC-6×8	20	5.6	216	2950	24.8	37	47.4	5.2	247
2.5GC-6×9	15	4.2	279	2950	26.1	22	43.7	4.9	262
2.5GC-6×9	20	5.6	243	2950	27.9	22	47.4	5.2	262
2GC-5×2	10	2.8	64	2950	4.4	7.5	39.6	4.6	140
2GC-5×3	10	2.8	96	2950	6.6	11	39.6	4.6	163
2GC-5×4	10	2.8	128	2950	8.8	15	39.6	4.6	178
2GC-5×5	10	2.8	160	2950	11	15	39.6	4.6	193
2GC-5×6	10	2.8	192	2950	13.2	18.5	39.6	4.6	206
2GC-5×7	10	2.8	224	2950	15.4	22	39.6	4.6	223
2GC-5×8	10	2.8	256	2950	17.6	30	39.6	4.6	238
2GC-5×9	10	2.8	288	2950	19.8	30	39.6	4.6	253
4GC-8×10	45	12.5	410	2950	84	100	60	4.9
4GC-8×10	55	15.3	380	2950	91	100	62.5	5.5
4GC-8×10	30	8.3	430	2950	69	100	51	4.5
4GC-8×2	30	8.3	86	2950	13.8	30	51	4.5
4GC-8×2	45	12.5	82	2950	16.8	30	60	4.9
4GC-8×2	55	15.3	76	2950	18.1	30	62.5	5.5
4GC-8×3	55	15.3	114	2950	27.2	37	62.5	5.5
4GC-8×3	30	8.3	129	2950	20.7	37	51	4.5
4GC-8×3	45	12.5	123	2950	25.2	37	60	4.9
4GC-8×4	30	8.3	172	2950	27.6	55	51	4.5
4GC-8×4	45	12.5	164	2950	27.6	55	60	4.9
4GC-8×4	55	15.3	152	2950	36.2	55	62.5	5.5
4GC-8×5	30	8.3	215	2950	34.5	55	51	4.5
4GC-8×5	45	12.5	205	2950	42	55	60	4.9
4GC-8×5	55	15.3	190	2950	45.3	55	62.5	5.5
4GC-8×6	30	8.3	258	2950	41.4	75	51	4.5
4GC-8×6	45	12.5	246	2950	50.4	75	60	4.9
4GC-8×6	55	15.3	228	2950	54.1	75	62.5	5.5
4GC-8×7	30	8.3	301	2950	48.2	75	51	4.5

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

What is your typical delivery time?

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Do you have centrifugal pumps in stock?

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

What information should I provide when requesting a quote?

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

What products do you mainly produce?

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Could you help me with the selection?

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Why is it so slow to get a price quote?

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

DG-type Sub-high-pressure Boiler Feed Pump (BB4)

None

DG-type Sub-high-pressure Boiler Feed Pump (BB4)

None

+86 0731-88632200

Export Trade/Technical Support:

+86 153-4831-2290

Head Office Email:

zoomlian@yeah.net

No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor

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Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

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