Luoyang Wohong Petrochemical Equipment: Introduction to Annual Maintenance and Startup Debugging Services for Solvent Recovery Unit
Release time: 2026-09-29
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After a solvent recovery device has been continuously operating for one year, scaling on the heat exchange surface, aging of seals, and drift of control parameters will gradually accumulate. The annual maintenance is to address these accumulated issues in a centralized manner, allowing the device to enter the next operating year in a state close to its initial operation. Luoyang Wohong Petrochemical Equipment's annual maintenance and startup commissioning services cover three aspects: shutdown inspection, cleaning and replacement, and machine verification. The maintenance report delivered also serves as the baseline for the next year's operation management.
This service targets two types of customers: for devices entrusted for operation and maintenance, the service provider bears full responsibility for organization; for devices self-managed for operation and maintenance, the service provider provides technical support for maintenance plans, key process construction, and startup debugging, with the boundaries of responsibilities clearly stated in the agreement.
How to organize maintenance
The shutdown inspection is conducted item by item according to the system: the condensation system is checked for scaling on the heat exchange surface and the state of the refrigerant; the adsorption system is checked for material lifespan and bed status; the pump is checked for vibration, temperature rise, and sealing; the pipeline system is checked for sealing points and insulation; the control system is checked for instrument calibration and interlock action. The inspection results are recorded on the spot, and defects are handled in three levels - those that can be repaired on the spot, those that are included in this maintenance, and those that require spare parts and need to be scheduled separately. Each item is implemented without any omissions.
Cleaning and replacement shall be carried out according to the defect list: cleaning of heat exchange surfaces, replacement of wearing parts, and replenishment or replacement of adsorbent materials. Construction records shall be kept after each item is completed. Spare parts shall be counted and purchased two weeks before maintenance. The time utilization rate of the maintenance window depends on the availability of spare parts - most of the reasons for maintenance delays are not due to construction, but rather waiting for parts.
It is recommended to plan the maintenance schedule in advance: from window appointment, scheme confirmation to spare parts in place, the normal cycle is about one month. Temporary arrangements within one week are prone to gaps in both spare parts and personnel. The annual maintenance should be fixed - conducted at the same time each year, so that the annual trend comparison of the device has a clean basis.
How to perform startup debugging
The startup after maintenance is not a simple process of power-on and start: first, conduct system air tightness and vacuum degree verification, then put each system into operation according to the startup plan - for the condensation system, establish temperature levels first, confirm the recovery path is unobstructed, gradually increase the load to the normal range, and record the parameters of each step on the startup record sheet. The core verification of commissioning is to ensure that the temperature levels, vacuum degree, and recovery rate return to the design range. Deviations are analyzed on the spot, and those that are due to maintenance issues or changes in operating conditions are documented.
The completion of startup does not equate to the end of service: After a continuous 72-hour operational observation period, once the parameters stabilize, data handover is conducted with the station party. The maintenance report is delivered along with the startup records. The trend comparison in the report - recovery rate, energy consumption, and defect distribution for this year compared to the same period last year - serves as the basis for compiling the maintenance plan and spare parts inventory for the next year.
Service content and delivery
| Service link | Content | deliverables |
|---|---|---|
| Shutdown inspection | Inspect each of the five systems | Defect Grading List |
| Clean and replace | Heat exchange surface and wearing parts treatment | construction record |
| Air tightness verification | System pressure maintenance and leak detection | Check the data |
| Startup debugging | Operate and load each system in turn | Power-on record sheet |
| observation period | 72-hour parameter monitoring | Handover confirmation sheet |
| Maintenance report | Trend comparison and suggestions | The report will be delivered within three days |
How to implement the service
- The maintenance window should be agreed upon in advance, and the spare parts list should be finalized two weeks in advance;
- Conduct a thorough inspection of the system item by item during downtime, and handle and close defects according to their classification;
- Cleaning and replacement shall be carried out according to the list, and construction records shall be archived item by item;
- The system is commissioned step by step according to the plan, and the three core verifications meet the standards;
- During the 72-hour observation period, both parties involved in the data handover shall sign for confirmation;
- The maintenance report includes a trend comparison, which will serve as the basis for next year's plan.
Frequently Asked Questions
When is the appropriate time to schedule the maintenance window each year?
Combine with the off-season or planned downtime of production to avoid peak production scheduling. The window is agreed upon one month in advance, allowing for spare parts procurement and personnel arrangements with surplus. Temporary window appointments often get stuck on spare parts.
What should we do if the recovery rate fails to return to the design value after maintenance?
The verification phase of startup commissioning will reveal the following: first, distinguish whether it is due to maintenance oversight or changes in operating conditions - for oversight items, rework and handle them; for changes in operating conditions (such as changes in intake concentration and load structure), provide suggestions for operational adjustments or modifications. Both situations are clearly defined.
Is it necessary to purchase this service for a self-managed and operated website?
Examine our own weaknesses: We can handle tasks that can be covered by our daily maintenance team. However, tasks such as startup debugging, critical process construction, and annual trend analysis require strong expertise. It is more cost-effective to entrust these tasks to professional service providers, with both parties dividing the work according to a detailed list.
This article is compiled by Luoyang Wohong Petrochemical Equipment Co., Ltd., which provides design, manufacturing, and operation and maintenance services for condensation recovery, membrane separation recovery, and complete solvent recovery equipment to chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please feel free to contact us for discussion.
