Volm VMB05 Double-Casing Multistage Centrifugal Pump in 200 kt/a Alkane-Aromatic Unit

1.Excessive Maintenance

• Shield sleeve wear caused motor winding failures → 4 repairs/year, 72 hours/downtime per incident.

2.Low Efficiency

• 15% flow diverted for motor cooling → actual efficiency only 65%.

3.Poor Load Adaptability

• Instability during ±20% flow fluctuations.

1. Double-Casing Structure for High Pressure

• Forged steel casing with center support withstands 10 MPa design pressure (well above 8.5MPa operating pressure); 

• FEA-optimized thickness → API 610 3× nozzle loads, ≤0.03mm thermal displacement (vs. 0.1mm in canned motor pumps);

• Extends seal life to 25,000 hours.

2. Cartridge Quick-Replacement Design

• 32-component core bundle (impellers, guide vanes, shaft, etc.) can be replaced in ≤8 hours without pipe disassembly (vs. 24 hours for canned motor pumps).

3. Hydraulic Precision & Sealed System 

• CFD-optimized narrow-vane impellers and guide vanes + precision casting (±0.05mm tolerance) → 70% efficiency (+5% vs. canned motor pumps).

• API 682 cartridge seals:

1. Plan 11 self-flushing (≤5% flow) prevents coking;

2. Plan 53B barrier fluid (+0.14MPa over seal chamber) with accumulator and DCS monitoring → zero leakage.

4. Operational Flexibility

• Impellers in series + balance drum reduce axial load by 60%;

• Stable operation at ±30% flow fluctuation (50~80 m³/h verified).