Seasonal inspection is the most easily skipped and accident-prone part of the solvent recovery unit throughout the year. Before winter, check the heat preservation, refrigerant, drainage and instrument, which is much more convenient than freezing and blocking roads at low temperature in winter and stopping the instrument for emergency repair. This paper combs the key projects and service arrangements according to the inspection order.
The influence of low temperature on the device is in series: the pipe section with damaged insulation is first condensed and frosted, the liquid accumulation at the drainage point freezes to block the road, the condensation temperature deviates from the design range, and the recovery rate drops. The instrument connecting pipe freezes and cracks, the pressure pipe accumulates water and freezes, and the display is distorted or even stops. These problems broke out one by one after the winter, and the repair window coincided with the peak production season, which cost much more than a systematic inspection.
The inspection shall be carried out in the order of "first heat preservation, then refrigerant, then liquid discharge and final instrument". See the following table for key items:
| Inspection item | Inspection method | Processing direction |
|---|---|---|
| Insulation of pipeline and equipment | Visually check the weak section with infrared temperature measurement | Repair the damaged insulation layer |
| Refrigerant system | Check refrigerant storage, pressure and heat exchange surface | Supplement refrigerant and clean heat exchange surface |
| Low Point Drain | Point-by-point test run to confirm patency | Dredge and do antifreeze tracing |
| Instrument and Pressure Pipe | Check the accumulated water, heat preservation and indication value | Drainage, insulation or replacement |
On-site inspection is recorded item by item, and problems are classified according to the three levels of "immediate treatment, deadline treatment and inclusion in the maintenance plan": heat preservation supplement, drainage and dredging, which can be handled on the spot on duty; Heat exchange surface cleaning, heat tracing and installation, etc. that require shutdown or spare parts are included in the deadline; Items involving overhaul are included in the annual maintenance plan to form a closed-loop ledger.
LuoyangWohong PetrochemicalEquipment Co., Ltd. provides seasonal inspection service for solvent recovery devices: on-site inspection before winter, inspection list according to device model, inspection records and rectification suggestions after on-site inspection, items that can be handled on duty are handled on the spot, and problem items are filed after closed-loop re-inspection. The inspection records are synchronized as the reference for winter operation parameters, which is convenient to check the recovery effect week by week during the heating period.
It is suggested that the rectification window should be reserved before the temperature drops steadily to the low temperature section. The northern region should plan ahead to avoid the rush repair peak brought by the first cold wave.
Daily thermal insulation and drainage inspection can be completed by the enterprise self-inspection; Refrigerant system, instrument calibration and other items that need professional testing are recommended to be entrusted to the service party, and the results of the two parties are summarized into a ledger with the same caliber for easy comparison.
Issues involving insulation deficiencies and the risk of liquid drainage freezing should be addressed before winter; otherwise, the likelihood of failures during cold periods will be high. Items that do not affect winter operations may be included in the annual plan, but must have clearly defined responsibilities and deadlines.
It serves as the benchmark for winter operating parameters and also marks the starting point for the seasonal inspection conducted the following year. Over time, the accumulated data can reveal trends in the equipment’s condition, enabling proactive maintenance planning.
This article was compiled by Luoyang Wohong Petrochemical Equipment Co., Ltd. The company provides services such as seasonal inspections of solvent recovery units and winter operation and maintenance support. We welcome your inquiries and discussions.
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