Vertical Oil-Free Reciprocating Vacuum Pump Usage and Precautions in Chemical Plants

I. Typical Applications

1.Corrosive Gas Handling

Suitable for strong corrosive gases (HCl, Cl₂, SO₂, etc.)

Requires PTFE-lined or 316L stainless steel construction

2.High-Purity Material Processing

Vacuum drying in pharmaceutical intermediates production

Electronic-grade chemical transfer

Food additive extraction

3.Solvent Recovery Systems

Recovery of benzene, alcohol, ester, and other organic solvents

Operating pressure range: -0.08 to -0.095 MPa

II. Key Advantages

1.Zero Contamination

Oil-free design prevents product contamination

Complies with GMP/FDA certification requirements

2.Low Maintenance

No oil changes required

Annual maintenance costs 40-60% lower than oil-lubricated pumps

3.Compact Structure

Vertical design saves installation space

30% smaller footprint compared to horizontal pumps

III. Critical Selection Parameters

1.Pumping Speed

Small pumps: 10-50 m³/h

Medium pumps: 50-200 m³/h

Large pumps: 200-500 m³/h

2.Ultimate Vacuum

Single-stage: -0.092 to -0.095 MPa

Two-stage: Up to -0.098 MPa

3.Material Requirements

Standard: Cast iron + PTFE seals

Corrosion-resistant: 316L stainless steel + ceramic piston

IV. Operational Precautions

1.Pre-Startup Checks

Verify valve positions (inlet/outlet)

Inspect cooling water system (for water-cooled models)

Ensure stable power supply voltage

2.Runtime Monitoring

Bearing temperature ≤ 75°C

Motor current must not exceed rated value

Abnormal vibration (amplitude < 0.05 mm)

3.Special Condition Handling

Particulate-laden gas: Install cyclone separator

High-temperature gas (>80°C): Add gas cooler

Flammable/explosive gases: Use explosion-proof motor

V. Maintenance Guidelines

1.Daily Maintenance

Check seal leakage daily

Clean intake filter weekly

2.Scheduled Maintenance

Inspect piston rings every 500 hours

Replace valve plates every 2,000 hours

Replace all seals annually

3.Troubleshooting Common Issues

Low vacuum: Check valve plates/seals

Abnormal noise: Inspect bearings/connecting rod

Overheating: Clean cooling system

VI. Safety Warnings

1.Prohibited Operations

Do not pump strongly oxidizing gases (e.g., pure oxygen)

Not suitable for applications requiring >-0.098 MPa ultimate vacuum

2.Emergency Procedures

Severe vibration occurs

Motor overload alarm triggers

Major seal leakage detected

Immediate shutdown required if:

Severe vibration occurs

Motor overload alarm triggers

Major seal leakage detected

VII. Comparison with Horizontal Pumps

1.Advantages

Lower vibration

Simpler foundation requirements

Better for space-constrained installations

2.Disadvantages

Slightly more complex maintenance

10-15% higher cost

VIII. Troubleshooting Guide

1.Insufficient Pumping Speed

Possible causes: Clogged intake filter / Damaged valve plates

Solution: Clean or replace components

2.Abnormal Temperature Rise

Possible causes: Cooling failure / Worn piston rings

Solution: Check cooling system / Replace rings

3.Vacuum Fluctuation

Possible causes: Seal leakage / Gas backflow

Solution: Tighten seals / Inspect check valve