Maintenance and Care for Cast Iron Centrifugal Pumps
The design principle of a cast iron centrifugal pump involves water spinning in the impeller to generate centrifugal force, which forces water outward along the casing walls, reducing pressure at the impeller's center. This pressure difference allows water to flow into the pump from the suction chamber continuously. Here are the maintenance and care methods after operation:
1. Maintenance During Operation:
(1) Ensure a tight seal on both the suction and discharge pipelines.
(2) Avoid long-term operation under cavitation conditions for cast iron pumps.
(3) Never run an electric motor for a high-discharge centrifugal pump beyond its rated current for extended periods.
(4) Regularly inspect the pump's performance, preventing overcurrent in the motor for too long.
(5) Assign the pump to prevent accidents.
(6) Apply lubricant to the bearings every 500 hours, with larger motors (above 11 kW) requiring a dedicated lubrication system that can inject oil directly using a high-pressure gun.
(7) If increased noise and vibration indicate mechanical wear, stop the pump for inspection and necessary replacement.
2. Maintenance for Mechanical Seals:
(1) Maintain clean and particle-free lubrication for the mechanical seals.
(2) Never operate the seal under dry friction conditions.
(3) Rotate the pump (motor) a few times before starting to prevent seals from cracking or damage due to sudden startup.
Translation:
Maintenance and Care for Cast-Iron Centrifugal Pumps:
The operating principle revolves around water spinning in the impeller to create centrifugal force, drawing water into the pump from the suction side. Key maintenance guidelines post-operation are as follows:
1. During Operation:
- Ensure a watertight seal on the intake and discharge lines.
- Avoid prolonged operation when cavitation occurs.
- Prevent overloading the motor beyond its rated current for extended durations.
- Regularly check the pump's performance and motor currents.
- Assign专人 for supervision to prevent incidents.
- Lubricate bearings every 500 hours; larger motors require dedicated lubrication systems with direct oil injection.
- Address increased noise and vibrations due to mechanical wear by stopping, inspecting, and replacing parts if needed.
2. Seal Maintenance:
- Keep mechanical seals well-lubricated without foreign particles.
- Never operate under dry-seal conditions.
- Pre-start the pump by rotating it a few times to avoid seal damage from sudden startup.
