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 boosting stations. 2.1.1 The top cover should consist of a fiberglass side cover and an openable pump station lid. The lid material can be made from lightweight materials such as fiberglass or aluminum alloy.

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

2.1.3 The GRP (Glass Reinforced Plastic) cylinder material should consist of a corrosion-resistant layer, a waterproofing layer, a structural layer, and an outer protective layer (as shown in Figure 2.1.3), with the thickness of each layer as depicted. The outer protective layer is enhanced with UV-resistant materials 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 patterned plate, with a tensile strength of at least 120MPa, and the plate thickness should be 5mm or more (excluding the pattern). The cover edge should be no less than 20mm.

2.1.6 The glass steel pipes are made by using unidirectional glass fiber roving and its products as reinforcement materials, with thermosetting resin as the matrix, and are produced through computer-wound technology, featuring uniform thickness. The Brinell hardness should reach 40HBa or higher, the compressive strength should reach 120MPa or higher, the hoop tensile strength should be 150MPa, and the axial tensile strength should be 60MPa.

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

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

2.2 Base

2.2.1 The base should be an arched concave structure. The inner side of the base can be pre-allocated or equipped with a stirrer or a crushing grate as per design requirements.

2.2.2 The base should have a tensile strength of 120MPa or higher and a Brinell hardness of 40HBa or higher.

2.2.3 The skirt periphery 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 bottom should be equipped with concrete slab anti-floating, with the design dimensions of the concrete slab determined based on the anti-floating calculation. For multi-well pump stations and structures at the front and rear ends of the pump station, it is recommended to use the same concrete slab. The cement strength grade of the concrete slab should not be less than C40, the diameter of the reinforcing bars should not be less than 10mm, and the thickness should not be less than 250mm. The concrete slab should be pre-buried with anchor bolts for the fixation of the prefabricated pump station after being hoisted into the pit. The concrete slab can be precast or directly cast 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 points of the pump. For dry pump stations, select vibration-proof components based on the type of pump.

2.3 Service Platform and Automatic Coupling System

2.3.1 It is advisable to set up a service platform within the integrated precast pump 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 "Basic Dimensions of Panels, Racks, and Cabinets with a Height Increment of 20mm" GB/T3047.1.

2.4.2 The surface of the control cabinet should be smooth and even, with welding joints being uniform and strong, without any 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 inside the control cabinet should be secure, and wiring should comply with the design drawings and relevant standards.

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

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

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

2.4.8 The control cabinet should be equipped with lifting rings for easy hoisting.

2.4.9 The protection class of the control cabinet shall comply with the current national standard "Shell Protection Class" 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:

The control cabinet panel should have a display interface.

2 The control cabinet panel should display power, current, and voltage, etc.

The control cabinet panel can display the pump start/stop status.

4 The control cabinet should be capable of setting pressure, actual pressure, and frequency display.

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

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

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

The electrical clearances and creepage distances between energized circuits in the control cabinet, as well as between energized 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 the live circuits within the equipment, and between the live circuits and conductive components, shall be at least 1000Ω/V at the nominal voltage.

Dielectric strength should comply with the provisions of the current national standard "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 shall be equipped with relevant production licenses and product certification. The mean time between failures of the submersible pump shall not be less than 2500 hours.

2.5.2 The pump and pipe connections should be firm.

2.6 Pipeline System

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

2.6.2 Pipe fittings used for piping systems are made of stainless steel.

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