Is the air compressor subject to key seepage prevention or standard seepage prevention?

Key criterion: Focus on the pollution pathway, not the equipment name.

Whether an air compressor is designated as a key seepage‑control area typically depends not on the device’s name—“air compressor”—but on its operating media, associated facilities, potential liquid‑leakage pathways, and the project’s groundwater pollution‑prevention zoning requirements. If the equipment generates only compressed air and does not involve significant accumulations of oils, chemical agents, or hazardous liquids, the overall pollution risk is relatively limited.

In most cases, it can be treated as ordinary seepage control.

In typical industrial plants, areas housing air compressors, air receivers, dryers, and similar equipment may generally be classified as ordinary or standard seepage‑control zones if they meet the following conditions:

• The equipment is primarily powered by compressed air and does not store highly hazardous liquids on a long-term basis.
• Lubricant and coolant are used in small quantities, and drip trays, containment dikes, or collection systems are provided.
• There is no visible standing water on the ground; oil‑contaminated condensate can be routed to the collection system and shall not be discharged directly.
• The project’s environmental impact assessment and seepage‑prevention zoning did not designate this area as a separate key seepage‑control zone.

These areas may require prioritized seepage prevention.

Even if the compressor unit itself is treated with standard seepage‑control measures, the relevant localized areas shall still be upgraded to a higher seepage‑control level in any of the following situations:

• Set up storage areas for lubricating oil drums, coolant drums, waste oil drums, and other liquid containers.
• Install oil‑containing wastewater collection tanks, waste liquid collection tanks, or underground collection facilities.
• The air compressor room is co-located with the hazardous waste temporary storage area, the chemical storage area, and the oil storage area.
• Equipment foundations, trench systems, and sump pits are at risk of long-term liquid accumulation or leakage.
• The project is located in a groundwater-sensitive area, and the environmental impact assessment has imposed stricter seepage‑prevention requirements.

Engineering Layout Recommendations

• The area surrounding the air compressor foundation shall be paved with a hardened surface and provided with adequate drainage slopes to prevent prolonged liquid accumulation.
• Oil drums and coolant drums shall be placed on pallets or within bunds and kept separate from the main equipment area.
• Oil‑containing condensate shall be collected in a collection tank or system and disposed of regularly in compliance with applicable regulations.
• Waste oil, used filter elements, and spent adsorbent materials generated during maintenance shall be temporarily stored in accordance with hazardous waste management requirements.
• The seepage-control measures shall be consistent with the plant‑area zoning plan, the environmental impact assessment documentation, and the construction drawings.

How to quickly determine

Three questions can serve as a starting point: Are there any oil‑based or chemical liquids stored on site? Is there a potential for the accumulation of oil‑contaminated wastewater? Has the environmental impact assessment designated this area as a key seepage‑control zone? If all three answers are no, the air compressor area can generally be treated as a standard seepage‑control zone; however, if there are clear pathways for liquid contamination, it should be managed according to enhanced seepage‑control requirements or higher standards.