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 from glass fiber or aluminum alloy, etc., lightweight materials.

2.1.2 The inner and outer surfaces of the lid should be smooth, with no cracks deeper than 2mm, no delamination, no exposed fibers, resin nodules, foreign matter mixed in, or uneven coloration.

2.1.3 The GRP (Glass Reinforced Plastic) cylinder material should consist of a corrosion-resistant layer, an impermeable 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 reinforced with UV-resistant material to prevent aging when exposed to sunlight.

Figure 2.1.3 Glass Fiber Reinforced Plastic (GFRP) Cylinder

Figure 2.1.3 GRP (Glass Reinforced Plastic) Cylinder (Unit: mm)

2.1.4 The overall roof should have anti-slip measures. The anti-slip roof 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 embossed pattern). The edge of the cover should not be less than 20mm.

2.1.6 Glass steel pipes, reinforced with unidirectional chopped glass fiber yarn and its products, and having a thermosetting resin as the matrix, are produced by computer-winding technology with uniform thickness. The Vickers hardness should reach 40HBa or higher, the compressive strength should be 120MPa or more, the circumferential tensile strength should be 150MPa, and the axial tensile strength should be 60MPa.

2.1.7 The lining layer includes the sub-liner 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 according to 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 arc-shaped structure, with the interior of the base reserved or installed with a stirrer or crushing grid as needed by the design.

2.2.2 The base should have a tensile strength of 120MPa or higher, and the Brinell hardness should reach 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 bottom of the base should have a concrete slab to prevent floating, with the design dimensions of the concrete slab determined based on anti-float calculations. Multi-well pump stations and structures at the front and rear ends of pump stations should preferably use the same concrete slab. The concrete slab should have a cement strength grade of not less than C40, with steel bar diameters not less than 10mm and thickness not less than 250mm. The concrete slab should be pre-bolted with anchor bolts for 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 weight of the pump station base should be ≥ 1.5 times the total weight of the pump to prevent vibration and resonance at the fixed connection point of the pump. Dry pump stations should select vibration-proof components based on the type of pump.

2.3 Platform and Automatic Coupling System

2.3.1 Platform services should be set up 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 Terminal connections within the control cabinet should be secure, and 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 color of indicator lights and buttons should comply with the specifications of 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 protection grade of the control cabinet shall comply with the provisions of the current national standard "Shell Protection Grade" GB4208.

2.4.10 The control cabinet should be equipped with various intelligent sensors, enabling unattended operation, programmed 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, voltage, etc.

3 The control cabinet panel features an indicator for the pump's start and stop status.

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

The control cabinet panel features audible 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 all components in the control cabinet should comply with the current national standard "Electrical Control Equipment" GB/T 3797.

The electrical clearances and creepage distances between live circuits in the control cabinet, between live components or grounded components, shall 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 components shall be at least 1000Ω/V as per the rated voltage.

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

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

2.5 Submersible Pump

2.5.1 Submersible pumps should be equipped with relevant production licenses and product certification. The average failure-free running time of the submersible pump should not be less than 2500 hours.

2.5.2 Pumps and pipelines should be securely connected.

2.6 Pipeline System

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

2.6.2 Pipe fittings used in pipeline systems are made of stainless steel.

2.6.3 Selection of pipes, fittings, and valves, as well as their connection methods, should comply with the "Outdoor Drainage Design Code" GB50014 and the "Construction Quality Inspection Code for Building Water Supply, Drainage, and Heating Engineering"