Rubber-lined Pump

The rubber-lined pump is a centrifugal pump with the flow components lined with vulcanized rubber - all the parts in contact with the medium, such as the pump body, impeller, front guard plate, rear guard plate, and volute, are covered with a layer of 5–20 mm thick vulcanized rubber on the metal substrate. The high elasticity of the rubber enables it to absorb the impact kinetic energy of fine particles, transforming "rigid resistance" into "flexible buffering", thereby significantly reducing the wear rate; at the same time, the chemical inertness of the rubber enables it to withstand acid and alkali media with a pH range of 3–12, avoiding electrochemical corrosion of the metal flow components.

Metal casing + rubber lining: The pump body is equipped with a cast iron or cast steel casing for structural strength, and is lined with a vulcanized rubber layer (thickness 5–20 mm) that directly contacts the medium. The rubber is bonded to the metal through a special adhesive, with a peel strength of ≥5 MPa.
Replaceable lining: The impeller, guard plate, and casing lining of the rubber-lined pump are independent parts. After wear, they can be replaced separately without requiring the entire pump body to be scrapped, reducing maintenance costs by more than 60%.
Unobstructed flow channel design: The impeller adopts single/double flow channel or vortex structure, with wide flow channels that allow passage of ≤10 mm fine particles (some models can reach 25 mm), providing excellent anti-blocking performance.
Bearings: Heavy-duty cylindrical bearing box, double-row tapered roller bearings + thrust bearings, lubricated with thin oil, capable of withstanding large radial and axial forces.
Material system:
Rubber materials: R26/R55 (natural rubber), S01 (EPDM), S10 (NBR), S31 (Hypalon), S42 (Neoprene), FKM (fluororubber)
Metal matrix: HT250 cast iron, QT500 ductile iron, ZG230-450 cast steel (selected based on working pressure)

Material selection decision tree:
pH 3–12, temperature ≤ 65°C, fine particles → R26 or R55 natural rubber (the most cost-effective option)
With sharp fine particles, severe cutting and wear → R33 soft natural rubber
Temperature 65–85°C, weak acid or alkali → S01 EPDM
With oil, neutral medium → S10 NBR
Strong acid (sulfuric acid ≤ 30%), temperature ≤ 90°C → S31 Hypalon
Seawater, brackish water → S42 Neoprene
Concentrated sulfuric acid, concentrated nitric acid, high temperature → FKM fluororubber
Custom service: Custom rubber material and thickness, OEM brand logo, special flange standards (ANSI/DIN/GB), explosion-proof motor, outdoor protective cover, complete skid-mounted system.

Rubber-lined pumps excel in the following "corrosion + fine particles" combined working conditions:
Power plant desulfurization (FGD): limestone slurry transportation, gypsum slurry discharge, absorption tower circulation pump (R55 natural rubber or S01 EPDM)
Chemical industry: acid and alkali slurry, phosphoric acid slurry (pH 2–4), fertilizer production slurry, chemical wastewater
Mining metallurgy: wet metallurgical leaching solution (pH 1.5–3), flotation tailings, fine tailings transportation
Environmental protection municipal: sewage treatment plant sludge, landfill leachate, river dredging fine silt
Steel industry: blast furnace gas washing water, steel rolling iron scale water, sintering desulfurization slurry
Seawater environment: seawater desulfurization, seawater desalination pretreatment (select S42 chloroprene rubber)
Paper industry: paper slurry transportation, black liquor treatment (select S01 EPDM)

Q1: How to choose between rubber-lined pumps and high-chrome alloy slurry pumps?
A: Consider the characteristics of the medium: ① Corrosion + Fine Particles (such as desulfurization gypsum slurry, chemical mineral slurry, wet metallurgical leaching solution) → Choose rubber-lined pumps, as rubber can absorb the impact of fine particles and is resistant to acid and alkali corrosion; ② Strong Abrasion + Coarse Particles (such as quartz sand tailings, gravel transportation) → Choose high-chrome alloy slurry pumps (Cr26/Cr28, HRC 58–63), as rubber will be cut by large particles and sharp hard objects; ③ Strong Abrasion + Corrosion + Coarse Particles → Choose a mixed configuration of metal impeller and rubber sleeve (MMR type). In simple terms: Corrosion dominant, fine particles soft → Rubber-lined pumps; Abrasion dominant, coarse particles hard → High-chrome alloy pumps.
Q2: How long does the rubber lining of a rubber-lined pump last?
A: Under typical desulfurization gypsum slurry conditions (pH 4–6, containing gypsum crystalline particles, temperature 50–60°C), the lifespan of R55 natural rubber lining is usually 6000–10000 hours (approximately 8–14 months of continuous operation). If the medium contains sharp particles (such as quartz sand fragments), the lifespan will be shortened to 3000–5000 hours. It is recommended to check the thickness of the lining every 1000 hours, and arrange for replacement when the wear exceeds 50% of the original thickness. The impeller and guard plate of the rubber-lined pump can be replaced separately without requiring the entire pump to be scrapped.
Q4: How to choose between AHR horizontal rubber-lined pumps and SPR vertical submersible rubber-lined pumps?
A: Consider the installation space and liquid level: ① AHR horizontal type - requires a ground foundation, horizontal installation of the pump body, convenient maintenance, suitable for pump houses with ground space; ② SPR vertical submersible type - the pump body is vertically inserted below the liquid level, the motor is above the liquid surface, no ground foundation required, suitable for collection wells, tanks, etc. in narrow spaces, submersible depth 0.5–3 m. If the medium contains a large amount of coarse particles (>10 mm), it is recommended to choose AHR horizontal type (facilitating cleaning and maintenance); if the medium is fine particles and the installation space is limited, choose SPR vertical type.

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