Four element parallel double plunger pump, as an industrial equipment with high precision and high load operation, is widely used in chemical, energy, pharmaceutical and other fields. Its complex structure and continuous operation characteristics require strict maintenance, and scientific maintenance strategies can significantly improve equipment reliability and extend service life. The following elaborates on the core maintenance points from four aspects: daily inspection, periodic maintenance, special maintenance, and emergency response.
1、 Daily inspection: Real time monitoring of operational status
Before starting up daily, perform a basic inspection: observe whether the pump casing is deformed or cracked, and whether the connecting flange bolts are loose; Check if the fluctuation range of the pressure gauge pointer is within the normal range (usually ± 5% of the rated pressure). Abnormal shaking may indicate cavitation or poor suction. During operation, abnormal noises are heard, and metal friction sounds are often caused by wear of the connecting rod bushing, while high-frequency whistling points to valve jamming. Temperature monitoring cannot be ignored. The temperature of the motor casing should be below 70 ℃, and the temperature rise of the reciprocating part of the plunger should not exceed 40 ℃. If the temperature exceeds the limit, the machine should be stopped immediately to check the cooling system. In addition, daily recording of operating parameters (pressure, flow rate, current) forms a curve graph to facilitate the detection of progressive performance degradation.
2、 Periodic maintenance: precise execution of time nodes
1. Monthly maintenance: Focus on handling vulnerable parts. Disassemble the inlet valve assembly, remove any blockages from the filter screen, and check the elasticity of the one-way valve spring; Lubricate the plunger guide copper sleeve with grease and fill it with high-temperature resistant lithium grease to 2/3 of the volume; Calibrate the set value of the pressure relief valve to ensure sensitive and reliable overpressure protection.
2. Quarterly deep maintenance: Disassemble the plunger assembly, measure the wear of the plunger diameter (replace if it exceeds 0.1mm), and replace the PTFE sealing ring; Check the clearance between the crosshead pin shafts, the radial runout should be<0.05mm; clean the crankcase, replace the anti-oxidation hydraulic oil, and synchronously replace the suction oil filter element.
3. Annual overhaul: Fully disassemble the pump body, check the coaxiality deviation of the crankshaft (≤ 0.02mm/m), repair or replace worn needle roller bearings; Grind and repair all sealing surfaces, and readjust the pre tightening force of the packing gland; Verify the set pressure of the safety valve and issue a third-party inspection report.
3、 Special maintenance: targeted problem-solving
Develop a special plan for special working conditions: After transporting corrosive media, the pump chamber must be flushed with clean water for at least 30 minutes to drain any residual media; Before long-term storage, anti-corrosion treatment should be carried out by injecting neutral anti rust oil into the cylinder body and applying Vaseline to the exposed metal surface; Winter homework requires the installation of a heat tracing belt to ensure that the viscosity of the hydraulic oil meets the start-up requirements. For frequent scaling problems, citric acid solution circulation cleaning can be used, combined with ultrasonic descaling to improve the effect.
4、 Emergency response: Quickly respond to sudden situations
When encountering sudden shutdown, prioritize checking whether the power phase sequence is correct and whether the thermal relay is triggered; If there is severe vibration, immediately switch to the standby pump and close the inlet and outlet valves, focusing on checking the alignment accuracy of the coupling (radial deviation ≤ 0.1mm). When a leak occurs, wear protective equipment according to the nature of the medium, first fix the plunger position with a wooden wedge, and then replace the damaged seal. All emergency responses must be documented in an event tree diagram to trace the root cause.
5、 Management standards: Establish a standardized system
Develop an Equipment Lubrication Card to specify the types and cycles of grease used at each lubrication point; Establish a spare parts inventory warning mechanism to maintain critical vulnerable parts (such as plungers and sealing rings) at low inventory levels; Implement preventive maintenance plan, decompose maintenance tasks into weekly/monthly/quarterly, and track execution progress through scanning system.
Through systematic maintenance, the quadruple parallel double plunger pump can always maintain optimal operating conditions, reduce the probability of unplanned shutdowns, and ensure production continuity. In practical operation, it is necessary to dynamically adjust the maintenance plan based on the equipment manual and on-site working conditions to achieve full lifecycle management of the equipment.