Lianyungang Industrial Equipment Chemical Cleaning & High-Pressure Water Jetting Services

Abstract: Lianyungang is the eastern bridgehead of the New Eurasian Land Bridge and one of China's seven major petrochemical bases. The Xuwei New District hosts large-scale refining-chemical integration projects. DanYang Blue Star provides chemical cleaning and high-pressure water jetting services for petrochemical units, heat exchangers, pipelines, boilers and reactors in Lianyungang, with nitrogen purging safety protocols and compliant wastewater treatment.

1. Lianyungang Industrial Cleaning Background

Located on the northeast coast of Jiangsu Province, Lianyungang has developed a portside industrial system centered on petrochemicals, new pharmaceuticals, new materials, steel and renewable energy equipment manufacturing. The Xuwei New District, a national-level petrochemical industrial base, hosts several large refining-chemical integration projects with tens of millions of tons of crude processing capacity — one of China's largest private refining clusters.

Equipment fouling in Lianyungang exhibits distinct industry characteristics. Petrochemical heat exchangers and columns face heavy oil coke, carbon deposits and polymer fouling — atmospheric-vacuum unit heat exchangers operating above 350°C develop hard coke scaling 10-20mm thick, reducing efficiency by over 50%. Coastal water hardness causes rapid carbonate scaling in cooling water heat exchangers within 6-12 months. Steel plant boilers face silicate and iron oxide scaling, while port machinery hydraulic systems accumulate oil sludge deposits. DanYang Blue Star is approximately 320km from Lianyungang and can reach any district (Lianyun, Haizhou, Ganyu, Donghai, Guanyun, Guannan and Xuwei) within 24 hours for on-site inspection.

2. Common Equipment Cleaning Scenarios

Large Petrochemical Heat Exchanger Cleaning: Shell-and-tube heat exchangers in Lianyungang petrochemical plants typically have shell diameters of 1.5-3m and heat exchange areas of 1000-5000m². Heavy oil coke scaling resists conventional acid cleaning. DanYang Blue Star uses a two-step solvent pre-soak + chemical cleaning process — 24-48 hour solvent soak to soften coke matrix, followed by 8-12 hour Sulfamic Acid circulation with corrosion inhibitor. Post-cleaning heat transfer temperature differential recovers to over 90% of design.

Petrochemical Column and Storage Tank Cleaning: Large distillation columns (3-8m diameter, 30-60m height) accumulate polymer and coke deposits on internal walls, requiring confined space entry after nitrogen purging and combustible gas verification. High-pressure water jetting (1000-2000bar) with rotating nozzles cleans trays and walls layer by layer. Large storage tanks use chemical soaking + high-pressure water flushing combination.

Cooling Water Heat Exchanger Descaling: Coastal water hardness causes frequent carbonate scaling — 2-3mm tube scale reduces heat transfer efficiency by 15-25%. Sulfamic Acid circulation with Lan-826 inhibitor controls carbon steel corrosion below 4g/m²·h, restoring efficiency to 95% after 6-8 hours.

Industrial Boiler and Thermal Oil System Cleaning: 3mm boiler scale increases fuel consumption by ~25%. Specialized descaling agent circulation with high-pressure water flushing restores thermal efficiency to over 90%. Thermal oil boilers use dedicated carbon removal agents to restore tube wall heat transfer.

Port Machinery Hydraulic Line Cleaning: Large loading/unloading equipment hydraulic lines accumulate oil sludge and oxidation deposits. Specialized cleaning agent circulation with compressed air purging improves oil cleanliness from NAS 12 to NAS 8.

3. Core Technologies

Safety Cleaning System: Three-step safety verification for petrochemical equipment — nitrogen purging (O₂<2%), combustible gas detection (LEL<10%), toxic gas detection (H₂S<10ppm). Explosion-proof lighting, ventilation and portable gas detectors throughout operations. Wastewater collected via closed pipelines, neutralized and filtered to pH 6-9 for compliant discharge.

Multi-Stage Composite Scale Treatment: Four-stage combined operation for organic-inorganic composite scales — Stage 1: high-pressure water jetting (1500-2800bar) removes hard surface scale; Stage 2: solvent soak softens polymer matrix; Stage 3: chemical cleaning dissolves inorganic salts; Stage 4: passivation forms protective film. Four-stage treatment restores equipment performance to 90-95%.

Confined Space Cleaning: Certified operators with full PPE, portable gas detectors and emergency rescue tripods, with dedicated safety monitor outside. Top-down layer-by-layer operation, each tray photographed post-cleaning for client acceptance.

4. Case Studies

Xuwei Petrochemical Enterprise: Six large shell-and-tube heat exchangers (2.2m shell diameter, 2800m² each) suffered severe efficiency loss from heavy oil coke scaling — shell-side inlet/outlet temperature differential dropped from design 25°C to 8°C, production capacity down 35%. Three-stage process: 48-hour solvent soak + 10-hour Sulfamic Acid circulation + 2000bar water jetting. Post-cleaning: all tubes clear, temperature differential restored to 23°C, efficiency to 92%, capacity to 95%. Annual energy savings exceeding 2 million RMB.

Lianyungang ETDZ New Materials Enterprise: Four stainless steel reactors (10,000L) with polymer and silicate mixed scale 4-6mm thick. Citric Acid with BTA inhibitor for 8 hours + low-pressure water jetting (400bar) + Sodium Nitrite passivation. Heat transfer coefficient restored to 97%, Cr₂O₃ passive film formed on internal surfaces.

Ganyu Steel Enterprise: Waste heat boiler (35t/h capacity) with 4-7mm silicate scale after 3 years of operation, thermal efficiency reduced to 78%. Specialized descaling agent circulation for 12 hours + high-pressure tube flushing + manual sediment removal. Efficiency restored to 91%, annual coal savings approximately 1,500 tonnes.

5. Service Process

1. Free Inspection: On-site arrival within 24 hours with scale analysis tools, thickness gauge, borescope and gas detectors for comprehensive equipment assessment.

2. Custom Solution: Formal technical proposal within 3 working days including cleaning process, agent selection with inhibitor formulation, construction schedule, safety measures, corrosion monitoring plan and detailed quotation.

3. Execution: Certified team with continuous monitoring of pH, temperature, iron ion concentration and corrosion coupon weight loss. Petrochemical operations with four-level safety protection and emergency response.

4. Acceptance: Pre/post cleaning parameter comparison with borescope photo documentation. Complete cleaning report with corrosion monitoring data and 6-month free follow-up.

5. Preventive Maintenance: Annual turnaround window alignment for petrochemical enterprises. DanYang Blue Star engages 2 months in advance for deep integration with shutdown planning. Preventive maintenance contracts include regular inspections.

Service Coverage: Jiangsu (Nanjing, Suzhou, Wuxi, Changzhou, Zhenjiang, Yangzhou, Taizhou, Lianyungang, Xuzhou, Huai'an, Yancheng, Nantong) · Zhejiang (Hangzhou, Ningbo) · Shanghai · Anhui (Hefei) · Shandong · Henan

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All acceptance criteria follow GB/T 25146-2010 Quality acceptance specifications of chemical cleaning for industrial equipment.