The tank adopts thickened Q345R pressure‑vessel steel plate. Welds pass non‑destructive flaw‑detection inspection. The tank stably withstands negative‑pressure without deformation. Its inner wall undergoes anti‑corrosion spraying for rust‑resistance and reduced water accumulation. It greatly buffers negative‑pressure fluctuation, cuts down frequent start‑stop of vacuum pumps and saves 12%–18% power consumption. Service life of vacuum host and pneumatic valves gets prolonged. Airflow slows down inside the tank to settle oil, water and dust, lowering load on rear‑end filters and improving purity of negative‑pressure air source. Full sets of standard safety fittings are equipped; over‑negative‑pressure auto‑relief explosion‑proof design and reinforced floor‑mounted supports deliver stable installation and small footprint. Complete qualification documents support factory safety inspection acceptance. The tank serves a 10–15‑year service lifespan. Nationwide on‑site after‑sales maintenance is available. It seamlessly adapts to the full lineup of Bonaisi vacuum and air‑compressor units with no pipeline re‑modification.