I. Preparation Before Maintenance

1.1 Safety Protection Preparation

• Wear full sets of protective equipment, including acid-alkali resistant gloves (for chemical and corrosive media), anti-slip work shoes, safety goggles (to prevent media splashing), and protective clothing (anti-static or anti-corrosive materials shall be selected based on the characteristics of the media).
• Check the ventilation condition of the operation area: If the conveyed media is toxic or flammable, turn on ventilation equipment and wear a gas mask if necessary.
• Confirm the equipment is in a shutdown state: Turn off the main power supply of the pump, hang a warning sign reading "Maintenance in Progress, No Switching On" on the distribution box, and simultaneously close the media inlet and outlet valves to prevent media leakage.

1.2 Preparation of Tools and Materials

1.3 Equipment Status Inspection

• Record equipment operation data: Before maintenance, check the equipment operation log to confirm the last maintenance time, recent flow fluctuations, abnormal noise, and other conditions, and initially identify potential problems.
• Pressure relief and emptying: Open the pump's blowdown valve to empty residual internal media (viscous media shall be heated to a flowable state before emptying; for example, crude oil transfer pumps need to be preheated to 40-60℃). Close the blowdown valve only after the pressure gauge shows 0MPa.

II. Standard Cleaning Procedures

V. Acceptance and Documentation After Maintenance

VI. Precautions and Emergency Handling

6.1 Precautions

• Maintenance operations are prohibited while the equipment is in operation. Cleaning high-temperature equipment (such as a crude oil transfer pump that has just been shut down) with flammable cleaning agents is prohibited.
• Grease/oil must be used for its designated purpose only; mixing different types (e.g., mixing lithium-based grease with calcium-based grease will cause lubrication failure) is prohibited.
• Wear parts must be purchased from the original manufacturer or regular suppliers to ensure material and model matching (e.g., food-grade sealing rings must be used in the food industry to avoid medium contamination).

6.2 Emergency Handling

• If medium leakage occurs during maintenance, immediately close the inlet and outlet valves, activate the emergency collection device, and clean up the leaked medium (select the treatment method based on the medium's characteristics, such as using a neutralizer for corrosive media).
• If severe vibration or abnormal noise occurs during operation after installation, immediately shut down the equipment, check the coaxiality, bearing lubrication condition, or the installation status of wear parts, and restart the equipment only after troubleshooting.
• If leakage from the sealing surface is severe, shut down the equipment, disassemble the sealing assembly again, check whether the sealing surface is damaged, and reinstall after replacing the damaged parts.

Standardized daily maintenance is the "lifeline" for the stable operation of viscous material transfer pumps. Operation and maintenance personnel must strictly follow the procedures in this manual, adjust the maintenance frequency based on the actual operating conditions of the equipment (such as medium viscosity, temperature, and pressure), and conduct regular skill training to ensure safe and efficient maintenance operations. Through the closed-loop management of "cleaning - lubrication - replacement of wear parts", the equipment's fault shutdown rate can be effectively reduced, its service life prolonged, and a guarantee provided for the continuous operation of production.