In the chemical production system,pump equipment is the core power source for material transportation,and the standardization of its operations is directly related to the continuous operation of production lines and the long-term reliability of equipment.Among them,rotary lobe pumps,as a typical representative of positive displacement pumps,are extremely prone to motor burnout,seal failure and even unplanned production interruption accidents due to improper operations in the start-stop and cleaning links.

-Bonve Pumps Cam-Type Double Rotary Lobe Pumps-

Before starting,a comprehensive equipment status verification must be completed:check the maintenance records and prepare the operation ledger,thoroughly clean the surrounding environment of the equipment;inspect the integrity of anchor bolts,grounding wires,all pipelines and instruments,and confirm that the coupling connection is firm and the rotation direction matches perfectly.The lubricating oil level should be controlled at the appropriate position of the oil gauge,the cooling system must be kept unobstructed,and the seal oil pressure should be 0.05-0.15MPa higher than the pump inlet pressure.There should be no jamming or abnormal noise during manual barring.High-temperature pumps need sufficient preheating and low-temperature pumps need complete pre-cooling.For suction conditions,pump priming and air exhaust are required;for backflow conditions,fill the pump with the conveyed liquid and then close the outlet gate valve,and finally contact the electrician to complete the power supply to the motor.

When starting,the outlet valve must be fully closed,because no-load start has an extremely large flow rate and high shaft power,which is very likely to cause severe motor overload.First,jog the motor to confirm that the rotation direction is correct.After the pump reaches the rated speed and the outlet pressure is stable,slowly open the outlet valve and strictly control the motor current within the rated red line range at all times.During operation,continuously monitor the shaft seal leakage;the bearing temperature rise shall not exceed 75℃,and the vibration value shall comply with ISO 2372 and ISO 3495 standards.It is strictly forbidden to adjust the flow rate through the suction valve to avoid destructive cavitation.In addition,the pump should not operate continuously for a long time below 30%of the design flow rate.If necessary,install a dedicated bypass pipe to discharge excess flow.

When shutting down,first slowly close the outlet gate valve.For backflow conditions,close the suction valve at the same time.Cut off the instrument power supply and then stop the motor operation.If an external liquid introduction seal is used,close the liquid introduction valve simultaneously.When the ambient temperature is lower than the medium freezing point,all residual liquid in the pump must be completely drained to prevent freezing and cracking of the pump body.For equipment that is out of service for a long time,drain all corrosive media,disassemble and clean key parts such as the seal chamber,apply oil coating for rust prevention and tightly seal the inlet and outlet flanges.

Cleaning is the core link of equipment maintenance,which directly determines the repair quality and subsequent service life of the pump.Parts cleaning shall be implemented in strict accordance with cleanliness grading standards.The requirements for mating parts are higher than those for non-mating parts,and the requirements for precision components are the highest.Scrape off scale and rust deposits on impellers,seal rings and bearings,and blow them clean with clean water or dry compressed air;clean the oil dirt and rust on the joint surfaces of the pump casing and unclog the water seal pipes;treat bearing bushes and bearings with special industrial cleaning agents,and clean ball bearings with gasoline.The cleaned parts need timely oil protection to prevent re-rusting.At the same time,ensure operational safety and avoid fire hazards and environmental pollution.

Standardized start-stop operations and professional cleaning are the fundamental guarantee for the long-term stable operation of rotary lobe pumps.Strictly following these standardized operating procedures can not only significantly reduce the equipment failure rate,but also effectively improve the overall safety and economic benefits of chemical production.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.