AS/AV Cutting Submersible Sewage Pump

Product Description

Model Code Explanation

 

Product Overview

The AS non-clog cutting submersible pump is designed for handling liquids containing hard solids and fibrous materials, as well as particularly dirty, viscous or slippery liquids. All AS pumps are equipped with an adjustable cutting mechanism that shreds long fibers, bags, straps, grass, cloth and similar materials in the wastewater before discharge. As a result, the pump operates reliably in sewage applications without clogging.

Product Features

1. Strong sewage-handling capability and non-clog design; capable of passing solid particles with diameters from φ30 mm to φ80 mm.
2. The cutting mechanism shreds and cuts fibrous materials so they can be discharged smoothly, eliminating the need for additional inlet strainers on the pump.
3. Optimized hydraulic design with low installed motor power for outstanding energy savings.
4. High-quality mechanical seal allows the pump to operate safely and continuously for more than 8,000 hours.
5. Compact structure, easy to move, simple installation, and no need to build a dedicated pump room, which significantly reduces construction costs.
6. Can be operated across the entire head range without overloading the motor.
7. A float switch can be used to automatically start and stop the pump according to liquid level changes, requiring no on-site monitoring.
8. A twin-guide-rail automatic coupling system greatly simplifies installation and maintenance, eliminating the need for personnel to enter the sewage pit.
9. Equipped with a fully automatic protection control panel to provide effective protection against leakage, water ingress and overload, thereby enhancing safety and reliability.

Applications

1. Discharge of heavily polluted wastewater from factories and commercial facilities.
2. Drainage systems in municipal sewage treatment plants.
3. Sewage lifting stations in residential areas.
4. Civil defense drainage stations.
5. Sewage discharge from hospitals and hotels.
6. Municipal engineering and construction sites.
7. Auxiliary equipment for exploration, mining and similar industries.
8. Rural biogas pits and farmland irrigation.

Operating Conditions

For AS pumps, the maximum medium temperature for continuous operation is approximately 40 °C; for intermittent operation (not exceeding 5 minutes), the allowable medium temperature is up to 80 °C.
The main components of the AS series pumps are made of cast iron; therefore, they are not suitable for pumping highly corrosive liquids.

Construction Description

1. The pump has a compact design, small footprint, attractive appearance and requires minimal installation space, reducing building costs.
2. The suction inlet and discharge outlet are positioned on the same centerline, simplifying pipeline connection.
3. According to site conditions, the pump inlet and outlet can be arranged at 90°, 180° or 270° orientation as required.
4. Depending on the application, the pump discharge can be configured with 1 to 5 outlets to achieve different heads from a single pump unit.

Performance Parameters

Model	Flow Rate	Head	Motor Power	Speed	Rated Voltage	Rated Current	Recommended Hose ID	Auto-Coupling Device	Weight
	(m³/h)	(m)	(kW)	(r/min)	(V)	(A)	mm
AS10-2W/CB	15	4	1.1	2850	220	5.65	76	80GAK	30
AS10-2CB	15	4.5	1.1	2850	380	2.9	76	80GAK	30
AS16-2CB	29	7.6	1.5	2850	380	3.5	76	80GAK	33
AS30-2CB	42	11	3	2850	380	6.4	76	80GAK	40
AS55-2CB	45	13	5.5	2900	380	11.1	127	100GAK	165
AS55-4CB	100	7.5	5.5	1450	380	11.6	152	150GAK	180
AS75-2CB	60	18	7.5	2900	380	15.0	127	100GAK	185
AS75-4CB	145	10	7.5	1450	380	15.4	152	150GAK	200
AV14-4	22	5.8	1.5	1450	380	3.5	76	80GAK	33
AV55-2	30	20	5.5	2900	380	11.1	76	100GAK	165
AV75-2	30	25	7.5	2900	380	15.0	76	100GAK	200

Performance Curves

Overall Dimensions

Model	D	F	G	H	J	K	L	M	N
AS10-2W/CB	76	280	220	110	130	70	100	210	373
AS10-2CB	76	280	220	110	130	70	100	210	373
AS16-2CB	76	280	220	110	130	70	100	210	373
AS30-2CB	76	335	220	110	155	70	100	260	398
AS55-2CB	127	630	350	175	240	160	310	430	688
AS55-4CB	127	630	350	175	240	160	310	430	688
AS75-2CB	152	655	400	205	248	190	335	430	740
AS75-4CB	152	655	400	205	248	190	335	430	740

Transport and Use – Important Notes

1. Never lift or suspend the pump by its power cable. For handling or lifting, attach a chain with hooks to the handle or lifting eye on the top cover.
2. For mobile use, connect a discharge hose of the specified standard bore (see table) to the discharge elbow with a suitable hose coupling. For fixed installations, design the discharge pipeline according to the flange standard of the auto-coupling device.
3. The pump must not be placed at the outlet of the sewage flow. When the pump is placed on soft mud or loose sand, vibration may cause it to sink. In this case, it is recommended to suspend the pump or place it on a larger base plate.
4. If the pump continues to operate at ambient temperatures below 0 °C, it may remain in service; however, once it is stopped, it should be lifted out, cleaned and stored properly to prevent damage from freezing.
5. The inside diameter of the discharge pipe should comply with the specified requirement. For long-distance discharge, the diameter may be reduced slightly if necessary, but excessive reduction can cause clogging and reduced efficiency and is not economical.
6. When the pump is used in sewage, sludge and other deposits may accumulate around the casing after long-term operation, reducing heat transfer and causing the internal temperature of the pump to rise, shortening motor life or causing nuisance tripping. Therefore, after each period of operation (for example, when the level drops to low water level), flush the pump with clean water to keep it clean.
7. The mechanical seal is lubricated and cooled by No. 10–30 mechanical oil. Due to seal wear, lubricant can leak out and the pumped medium may enter the motor through the seal. In this case, send the pump to our factory service department or an authorized service center for seal replacement as soon as possible to avoid motor damage.
8. Do not move the pump or touch the surrounding water when the power supply has not been disconnected. If the pump leaks electricity and no earth leakage circuit breaker is installed, electric shock accidents may occur.
9. After installation, the submersible pump should not be left immersed in water for long periods without operation, as this increases the risk of motor moisture ingress. It is recommended to run the pump for at least 4 hours each week to check performance and suitability. Otherwise, lift the pump and store it in a dry place.

Operating Instructions

Before starting the pump, a qualified electrician must check the system to ensure that all required electrical protection measures are in place:

1. Before operation, measure the insulation resistance between motor phases and from phases to ground with a 0–500 V megohmmeter; the minimum value must be greater than 2 MΩ.
2. The power supply must be safe, reliable and stable. Voltage and frequency must meet the specified requirements (voltage 380 V ±5%, frequency 50 Hz ±1%), and instantaneous voltage deviation must not exceed 10%. If the distance between the power supply and the pump is considerable, use a cable with a larger cross-sectional area and minimize joints to avoid excessive voltage drop. Seal all cable joints to prevent water ingress and leakage.
3. In the four-core cable, the conductor marked with the symbol “⊥” is the protective earth (typically green-yellow dual-color or black). For safe operation, the earth conductor must be firmly connected and made about 50 mm longer than the other conductors.
4. Where possible, electrical protection devices should include an earth leakage protection relay and a ground-fault circuit breaker. In all cases, fuses must be of the slow-blow type and matched to the rated current of the pump.
5. The electrical control cabinet should be protected from moisture and installed in a dry area. Route the power cable so that it cannot be sucked into the pump inlet or obstruct the suction.
6. Check the direction of rotation.
   After the first start-up or any reinstallation, verify the rotation direction. Incorrect rotation will reduce pump efficiency and may cause impeller loosening or other damage. To check the direction, lift the pump before installation and briefly jog the motor:a) Looking down from the top of the pump, the rotor should rotate clockwise.
   b) Looking up from the bottom (suction side), the impeller blades should appear to rotate counterclockwise.
   If several pumps are connected to the same control unit, each pump must be checked individually. If the rotation direction is incorrect, swap any two phases in the controller to correct it.

Maintenance and Service

AS pumps are robust and reliable. Every unit is carefully tested before leaving the factory. Grease-lubricated ball bearings give the pump long service life. However, to ensure durability, regular inspection and maintenance are strongly recommended.

1. Adjustment of Bottom Cover Plate

After prolonged operation in abrasive media, the gap between the impeller and the bottom cover plate may increase. Disconnect the power, loosen the fixing screws and rotate the cover plate to readjust the clearance to its original value (0.3–0.5 mm).

2. Cleaning

To prevent solids remaining inside the pump when it is out of service, run the pump with clean water to flush the interior. For long shutdown periods, store the pump in a dry place and protect it from freezing.

3. Oil Filling and Replacement

Before shipment, the oil chamber of the AS cutting submersible sewage pump is filled with an appropriate quantity of lubricant. This oil should be replaced annually as follows: place the pump so that the oil plug of the oil chamber (located on the inner side of the discharge outlet) faces downward; loosen the plug and drain the oil. Rinse the oil chamber with flushing oil, then refill with fresh lubricant (about 70–80% full). Replace the O-ring with a new one and tighten the plug. If the oil appears milky (emulsified), flush the chamber and refill with fresh oil and a new O-ring. Recheck after about three weeks; if the oil has become milky again, the mechanical seal must be inspected and, if necessary, replaced (contact our service department). If the seal is replaced by the user, a pressure tightness test must be performed (air pressure 0.5 kg/cm²). Recommended lubricant: No. 10 mechanical oil.

4. Operating Faults

If a fault occurs during operation and the cause cannot be identified, and the countermeasures described in the troubleshooting guide do not solve the problem, do not improvise or disassemble the pump at random. Instead, contact our service department. This is especially important for repeated tripping caused by overcurrent protection in the control circuit.

Installation Precautions

Correct installation and operation are the basic guarantee for long-term, trouble-free service. Users should pay particular attention to the following:

1. The pump power cable must be connected via the dedicated control panel or a properly matched thermal overload relay and must not be connected directly to the main power supply.
2. Whether in mobile or fixed automatic installation, neither the lifting chain nor the power cable may hang too loosely to avoid being sucked into the pump and cut by the impeller.
3. If the bottom of the sump contains thick sludge or large stones, place the pump at least 30 cm above the deposits or mount it on a large steel base plate.
4. The discharge pipeline must be selected and installed as specified in the instructions; do not modify the discharge line arbitrarily.
5. For a single pump installation where backflow cannot occur, it is preferable not to install a check valve.
6. For two pumps in parallel, do not install the gate valve and check valve only on the main header, otherwise backflow of sediment into the standby pump may prevent the check valve from closing properly. Where possible, install a dry pit on the manifold and mount the check valves and gate valves there.
7. Only after confirming the correct direction of rotation may the pump be put into continuous operation.
8. During long-term service, whether in automatic or manual mode, the pump must not be started too frequently. As a guideline, the number of starts should not exceed six times per hour.
9. Always disconnect the power supply before carrying out any maintenance work on the pump.