Working Principle of Vertical Long Shaft Sump Pumps

Vertical Long Shaft Sump Pumps evacuate fluid from deep pits/tanks using a surface-mounted motor driving submerged impellers via an extended shaft. Core functionality:

01.

Deep Sump Capability

3–30 m shaft lengths handle sumps unreachable by standard pumps (ISO 5199).

02.

Stabilized Rotation

Stainless steel column pipes with integrated bearings limit shaft deflection to <0.1 mm/m (API 610 VS1).

03.

Sediment Handling

Semi-open impellers pass solids ≤80 mm – ideal for sludge/stormwater.

04.

Dry Motor Protection

Motor operates above-ground – immune to flooding/contamination.

Key Advantages of Vertical Long Shaft Sump Pumps

Zero Submersion Risks

Eliminates seal failures and electrical hazards in flooded sumps.

High-Abrasion Resistance

Chrome-carbide-lined bowls withstand 20% solids content (ASTM G65).

Low NPSH Operation

Flooded suction enables <1 m NPSHr at BEP.

Maintenance Simplicity

Top-access service – no wet-pit entry required.

Overload Tolerance

200% starting torque handles viscous media.

Vertical Long Shaft Sump Pumps Design Specifications

Component	Technology	Benefit
Column Assembly	316SS Sch. 40 pipe	Corrosion-proof; 30m max depth
Lineshaft	17-4PH SS + tungsten carbide journals	API 610 compliance; 60k-hour life
Impeller	ASTM A532 Class III white iron	Passes rags/rocks; 75% efficiency
Bearings	Oil-bath Babbitt sleeves	Self-lubricating; 100,000-hour L10
Seal System	Double mechanical seals (Plan 54)	Zero leakage (ISO 21049)

Vertical Long Shaft Sump Pumps Performance Comparison

Parameter	Long Shaft Sump	Submersible Sump	Vertical Turbine
Max Solids Size	80 mm	35 mm	10 mm
Motor Protection	IP55 (dry)	IP68 (submerged)	IP54 (dry)
Temp Limit	120°C	40°C	90°C
Maintenance Cost	$ (top-access)	(retrieval)	$$
Depth Flexibility	Field-adjustable	Fixed	Fixed