Wastewater Lift Station

Integrated precast pump stations are equipment for lifting sewage, rainwater, drinking water, and wastewater. They are factory-produced and assembled, then transported to the site for installation as pressure pump stations. 2.1.1 The top cover should consist of a glass fiber edge cover and an openable pump station cover plate. The cover material can be made of glass fiber or lightweight materials such as aluminum alloy.

2.1.2 The inner and outer surfaces of the lid should be smooth, without cracks exceeding 2mm in depth, and there should be no delamination, exposed fibers, resin nodules, foreign matter mixed in, or obvious color inconsistencies.

2.1.3 The GRP (Glass Reinforced Plastic) cylinder material should consist of a corrosion-resistant layer, a moisture-proof layer, a structural layer, and an outer protective layer (as shown in Figure 2.1.3), with the thickness of each layer as indicated. The outer protective layer is added with UV-resistant material to prevent aging when exposed to sunlight.

Figure 2.1.3 Fiberglass Cylinder

Figure 2.1.3 Fiberglass (GRP) Cylinder (Unit: mm)

2.1.4 The overall roof cover should have anti-slip measures. The anti-slip roof cover can be made of glass fiber.

2.1.5 The aluminum alloy material for the cover should be anti-slip embossed plate, with a tensile strength of 120MPa or higher, and the plate thickness should be 5mm or more (excluding the embossment). The cover flange should be no less than 20mm.

2.1.6 Glass steel pipes, reinforced with unidirectional chopped strand glass fiber and its products, and with thermosetting resin as the matrix, are made by computer-winding process, featuring even thickness. The Brinell hardness should reach 40HBa or above, the compressive strength should reach 120MPa or above, the circumferential tensile strength should be 150MPa, and the axial tensile strength should be 60MPa.

2.1.7 The lining layer includes the intermediate layer and the innermost layer, with a total thickness of not less than 2mm, where the thickness of the innermost layer is not less than 0.3mm. The wall thickness of the pipe should not be less than the nominal thickness specified in the approved drawings and technical documents through the prescribed procedures.

2.1.8 The cylinder should be equipped with at least two external lifting lugs.

2.2 Base

2.2.1 The base should be a concave, arched structure. The inner side of the base can be pre-allocated or equipped with a mixer or a crushing grid as needed by the design.

2.2.2 The base's tensile strength should reach 120MPa or more, and the Brinell hardness should be 40HBa or higher.

2.2.3 The skirt edge of the base should have at least two grouting holes, with the diameter of the grouting holes reaching DN100 or more.

2.2.4 The base should have a concrete slab at the bottom for anti-floating, with the design dimensions of the concrete slab determined based on anti-floating calculations. For multi-well pump stations and structures at the front and rear ends of pump stations, it is advisable to use the same concrete slab. The compressive strength grade of the concrete slab should be no less than C40, the diameter of the steel bars should be no less than 10mm, and the thickness should be no less than 250mm. The concrete slab should be pre-bolted with anchor bolts for the purpose of securing the prefabricated pump station after it is hoisted into the pit. The concrete slab can be prefabricated or cast directly in the foundation pit.

2.2.5 The base weight of the pump station should be ≥ 1.5 times the total weight of the pump to prevent vibration and resonance at the fixed connection point of the pump. For dry pump stations, select vibration-proof components based on the pump type.

2.3 Service Platform and Automatic Coupling System

2.3.1 Platform services should be set within the integrated pre-fabricated pumping station.

2.3.2 The service platform should be made of aluminum alloy or glass fiber reinforced plastic, with a load-bearing capacity of not less than 450kg.

2.3.3 The automatic coupling system must not leak during normal operation and should facilitate the hoisting of the pump.

2.4 Control Cabinet

2.4.1 The control cabinet dimensions should comply with the requirements of GB/T3047.1, "Basic Dimensions of Panels, Racks, and Cabinets with a Height Increment of 20mm."

2.4.2 The surface of the control cabinet should be smooth and even, the welds should be uniform and strong, and there should be no obvious warping, bending, deformation, or burn-through defects.

2.4.3 Electrical and electronic components within the control cabinet shall comply with the specifications of relevant product standards.

2.4.4 The wiring terminals inside the control cabinet should be secure, and the wiring should comply with the design drawings and relevant standards.

2.4.5 The colors of the conductors and busbars used in the control cabinet shall comply with the relevant standards.

2.4.6 The colors of indicator lights and buttons should comply with the relevant standards.

2.4.7 The control cabinet's bottom should have mounting holes for securing to the foundation.

2.4.8 The control cabinet should have lifting rings or similar for easy hoisting.

2.4.9 The protective grade of the control cabinet should comply with the provisions of the current national standard "Shell Protection Grades" GB4208.

2.4.10 The control cabinet should be equipped with various intelligent sensors, enabling unattended operation, programmable control, and remote control.

2.4.11 The display function of the control cabinet panel shall comply with the following specifications:

1. The control cabinet panel should have a display interface.

2 The control cabinet panel should have displays for power, current, and voltage.

3 The control cabinet panel features a display indicating the pump's start and stop status.

4 The control cabinet should be set for pressure, actual pressure, and frequency display.

5 The control cabinet panel may have audio and visual alarm displays for faults.

2.4.12 The electrical performance of the control cabinet shall comply with the following specifications:

The temperature rise of each component of the control cabinet should comply with the current national standard for "Electrical Control Equipment" GB/T 3797.

The electrical clearance and creepage distance between live circuits of the control cabinet, between live components or grounded components, should comply with the provisions of the current national standard "Electrical Control Equipment" GB/T3797.

3 The insulation resistance measured between live circuits within the equipment and between live circuits and conductive parts shall be at least 1000Ω/V at the nominal voltage.

Dielectric strength should comply with the current national standard for "Electrical Control Equipment" GB/T3797.

The metal cabinet of the control cabinet should have a reliable grounding protection.

2.5 Submersible Pump

2.5.1 Submersible pumps must have relevant production licenses and product certificates. The average failure-free running time of the submersible pumps shall not be less than 2500 hours.

2.5.2 Pumps and pipes should be securely connected.

2.6 Pipe System

2.6.1 The piping should be made of stainless steel pipe. The material should comply with the current national standard "Welded Steel Pipes for Fluid Conveyance" GB/T12771.

2.6.2 Pipeline accessories are made of stainless steel.

2.6.3 The selection and connection methods of pipes, pipe fittings, and valves should comply with the Outdoor Drainage Design Code GB50014 and the Construction Quality Inspection Standards for Building Water Supply, Drainage, and Heating Engineering.