Mechanical Seal Renewal Of Cargo Pump

Mechanical Seal Renewal Of Cargo Pump

Cargo pumps on LPG (Liquefied Petroleum Gas) vessels are specialized pumps designed to handle the transfer of LPG cargo between the vessel and onshore facilities.

LPG is typically stored under pressure and at very low temperatures (-42°C for propane and -0.5°C for butane) to keep it in liquid form, so the pumps on these vessels are designed to operate safely under such conditions.

Renewing the mechanical seal on a cargo pump involves several detailed steps. Here’s a general guide to help you:

Safety Precautions

1. Ensure the pump is isolated from the system by closing valves and depressurizing it.

2. Drain the pump of any cargo and clean it thoroughly.

3. Follow safety guidelines for working in confined spaces or handling any remaining hazardous fluids.

Steps to Renew the Mechanical Seal

1. Disassemble the Pump:

   • Remove any couplings or bolts connecting the pump to the motor or drive.

   • Carefully detach the pump housing to access the mechanical seal area.

2. Remove the Old Seal:

   • Locate the mechanical seal assembly near the pump shaft.

   • Remove the set screws, nuts, or clamps holding the seal in place.

   • Slide the old seal off the shaft carefully, ensuring not to damage the shaft or other components.

3. Inspect and Clean the Shaft and Housing:

   • Inspect the shaft and seal housing for wear, grooves, or corrosion.

   • Clean all surfaces thoroughly to ensure a smooth fit for the new seal.

4. Install the New Mechanical Seal:

   • Lubricate the seal faces lightly, if recommended by the manufacturer.

   • Place the new seal on the shaft, ensuring the orientation is correct.

   • Reinstall any retaining clips, clamps, or set screws as per the manufacturer’s guidelines.

5. Reassemble the Pump:

   • Carefully reassemble the pump housing and secure all bolts and fasteners.

   • Reattach the pump to the motor or drive system as needed.

6. Test the Seal:

   • Slowly pressurize the pump and check for leaks.

   • Run the pump briefly to verify that the seal operates smoothly.

Tips for Success

1. Use Genuine Parts: Always use OEM parts or those recommended by the pump manufacturer.

2. Follow the Manual: Reference the specific pump model’s manual for torque specifications, lubrication types, and tolerances.

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