Huai'an Pipeline Chemical Cleaning & High-Pressure Water Jetting Service

1. Introduction: Industrial Pipeline Cleaning Demand in Huai'an

Huai'an, located in the heart of the North Jiangsu Plain, is a key central city in northern Jiangsu and an important node in the Yangtze River Delta integration. Anchored by four pillar industries — salt chemical processing, special steel & equipment manufacturing, attapulgite new materials, and food processing — Huai'an's above-scale industrial output exceeded RMB 400 billion in 2025. The city hosts China's first national-level salt chemical specialty industrial base, the Huai'an Salt Chemical New Materials Industrial Park. Leading enterprises such as Jingshen Salt Chemical produce over 6 million tons of industrial salt annually, forming a complete industrial chain from brine extraction to salt production, chlor-alkali, soda ash, and fine chemicals. During salt chemical production, brine collection and transport pipelines are exposed to high-concentration saline water (NaCl content up to 280 g/L) over extended periods, causing salt crystal scaling and CaSO₄ deposition at rates far exceeding those in conventional industrial pipelines.

Huai'an's second major pillar is the special steel and equipment manufacturing sector, centered on Huaigang Special Steel (a Shagang Group subsidiary). Rolling mill cooling water and descaling water pipelines face the triple challenge of high-temperature iron oxide scale deposition, oil contamination, and microbial slime buildup. Additionally, Xuyi County in Huai'an is China's largest attapulgite (palygorskite) clay production area. Attapulgite processing involves frequent blockages in slurry transport, acid activation, and drying exhaust pipelines, demanding high cleaning frequency and technical capability. Hongze Lake, as Huai'an's primary industrial water source, has surface water total hardness of approximately 160–220 mg/L CaCO₃, further accelerating scaling rates in heat exchange equipment and pipelines. This article systematically presents pipeline chemical cleaning and high-pressure water jetting solutions tailored to Huai'an's industrial characteristics and water quality conditions.

2. Common Pipeline Scaling and Corrosion Issues in Huai'an

2.1 Salt Chemical Brine Pipeline Salt Scaling and CaSO₄ Deposition

The core challenges facing brine collection and refined brine transport pipelines in Huai'an's salt chemical enterprises are NaCl crystallization precipitation and CaSO₄ (gypsum) scale deposition. After underground brine is lifted to the surface by pumps, changes in temperature and pressure disrupt NaCl supersaturation, causing crystalline salt layers to precipitate on pipe walls. Simultaneously, Ca²⁺ and SO₄²⁻ ions in the brine combine to form CaSO₄·2H₂O hard scale, which is insoluble in conventional acid cleaning solutions and requires special conversion agents for pretreatment before acid cleaning. According to monitoring data from a Huai'an salt chemical enterprise, DN250 brine collection pipelines develop scale thicknesses of 8–15 mm after 2–3 years of operation, reducing effective pipe cross-sectional area by over 40% and increasing pump energy consumption by approximately 30%.

2.2 Steel Mill Cooling Water Pipeline Iron Oxide and Oil Composite Fouling

Inside the rolling mill cooling water and high-pressure descaling water pipelines at Huaigang and similar special steel enterprises, high-temperature iron oxide (Fe₃O₄/Fe₂O₃) particles deposit on pipe walls along with water flow, mixing with emulsified rolling lubricant to form black, greasy composite sludge layers. This type of fouling is dense with strong adhesion, making it difficult to remove through conventional hydraulic flushing alone. Huai'an's hot and humid summer conditions (daily temperatures above 35°C in July–August) raise circulating cooling water temperatures to 35–40°C, creating ideal breeding conditions for iron bacteria and sulfate-reducing bacteria. Microbial slime and iron rust interact synergistically, forming bio-rust composite blockages at pipe bends and tees that can reduce pipe diameter by over 50%.

2.3 Attapulgite Processing Pipeline Slurry Blockage and Acid Corrosion

In Xuyi's attapulgite processing enterprises, slurry transport pipelines, acid activation solution lines, and exhaust gas scrubbing pipelines face unique cleaning requirements during purification and activation processes. Attapulgite slurry has high solids content (15%–30%), and clay mineral particles readily settle and accumulate at pipe bends and valves, forming hard mud cake blockages. H₂SO₄ or HCl solutions used in acid activation processes pose intergranular corrosion risks to stainless steel pipelines, requiring both cleaning and passivation protection for pipe inner walls. Drying exhaust pipeline inner walls accumulate attapulgite dust mixed with acidic condensate, which carbonizes at high temperatures to form difficult-to-remove coking layers.

3. Pipeline Cleaning Technical Solutions

3.1 Chemical Cleaning Processes

Pipeline Type & Industry | Cleaning Agent Formulation | Process Parameters

Salt chemical brine/extraction pipelines | HCl 6-10% + Sulfamic Acid 3% + BTA 0.1% + Penetrant | 40-50°C, 0.5-1.0 m/s flow, 8-12h circulation; CaSO₄ scale requires NaOH alkali conversion pretreatment

Steel mill cooling/descaling water pipes | Citric Acid 3-5% + BTA 0.05% + Surfactant | 80-90°C, 6-8h circulation, Sodium Molybdate 0.2% passivation

Attapulgite slurry transport pipelines | NaOH 3-5% alkaline boil → HCl 5-8% acid wash | Alkaline boil at 60-70°C for 4h, water rinse then acid wash at 40-50°C for 4-6h

Baijiu CIP/process pipelines (Jinshiyuan etc.) | NaOH 2-3% + Food-grade Surfactant | 65-75°C, 2-3h circulation cleaning, pure water rinse to neutral

Attapulgite acid-activated SS pipes | HNO₃ 8-12% + HF 1-2% | 40-50°C, 1-2h circulation, one-step pickling and passivation

3.2 High-Pressure Water Jetting Parameters

Application Scenario | Pressure (bar) | Flow Rate (L/min) | Nozzle/Tool Type

Salt chemical brine pipes DN100-250 | 500-800 | 30-45 | Rotary nozzle, NaCl crystal layer removal

Steel mill cooling pipes DN150-300 | 800-1200 | 45-60 | Self-rotating 3D nozzle, rust and oil sludge removal

Attapulgite slurry pipes DN80-200 | 800-1500 | 30-50 | Rotary nozzle + Pipeline Inspection Gauge (PIG)

Drainage/sewage pipes | 300-500 | 40-60 | Propulsion nozzle cleaning

3.3 CaSO₄ Scale Alkali Conversion Pretreatment Process

The challenge of CaSO₄·2H₂O (gypsum) scale layers that are insoluble in conventional HCl and Sulfamic Acid in Huai'an's salt chemical brine pipelines can be addressed through an alkali conversion process. Procedure: Before chemical cleaning, inject NaOH 5%–8% + Na₂CO₃ 3%–5% mixed alkali solution into the pipeline at 60–70°C, circulating for 4–6 hours. The alkali solution reacts with CaSO₄ through displacement: CaSO₄ + Na₂CO₃ → CaCO₃↓ + Na₂SO₄, converting the scale to acid-soluble CaCO₃. After alkali conversion, drain the solution and proceed with conventional HCl + Sulfamic Acid formulation cleaning, where CaCO₃ reacts with acid to form soluble CaCl₂, completely removing the pipe wall scale layer. This pretreatment process is particularly effective for gypsum scale layers exceeding 5 mm thickness in Huai'an salt chemical pipelines, improving cleaning efficiency by over 60%.

4. Service Coverage and Response Commitment

Danyang Blue Star Cleaning serves all of Huai'an, covering every administrative district: Qingjiangpu District, Huai'an District, Huaiyin District, Hongze District, Lianshui County, Xuyi County, and Jinhu County, with extended coverage to surrounding Suqian City (Sucheng, Suyu, Shuyang, Siyang, Sihong) and Lianyungang City (Guannan, Guanyun). Based at Danyang headquarters, Huai'an's main urban area is approximately 180 km, Lianshui approximately 190 km, and Xuyi approximately 160 km — all within a 2.5-hour service radius. Response time commitments: Huai'an city districts (Qingjiangpu, Huai'an, Huaiyin) within 2 hours on-site; counties (Hongze, Lianshui, Xuyi, Jinhu) and Suqian/Lianyungang surrounding areas within 3–4 hours. Equipped with multiple truck-mounted high-pressure water jetting units (up to 1500 bar) and chemical cleaning circulation pump stations, we provide 24/7 emergency repair services year-round, including holidays.

5. Local Cleaning Case Study

Project Overview: A large salt chemical enterprise within the Huai'an Salt Chemical New Materials Industrial Park had a brine extraction and transport pipeline system totaling approximately 1,200 m in length, DN200–DN250 diameter, carbon steel with epoxy internal coating, operating for 3 years without systematic cleaning. An early 2026 inspection found that pipeline transport flow had decreased by approximately 35% from design values, pump discharge pressure had increased by 0.8 MPa, and endoscopic examination revealed NaCl crystal and CaSO₄ mixed scale thickness of 8–12 mm, with pipe diameter reduction exceeding 40% at some bends.

Cleaning Solution: First, CaSO₄ alkali conversion pretreatment was performed (NaOH 6% + Na₂CO₃ 4%, 65°C, 5-hour circulation). After draining, HCl 8% + Sulfamic Acid 3% + BTA 0.1% + penetrant formulation was used for chemical circulation cleaning at 45°C, 0.8 m/s flow velocity, for 48 hours. Stubborn hard scale remaining at bends and tees after alkali conversion was spot-treated with high-pressure water jetting (800 bar). During cleaning, Ca²⁺ concentration and pH were sampled every 4 hours; endpoint was determined when Ca²⁺ concentration stabilized over three consecutive samples.

Cleaning Results: After completion, the CaSO₄ scale layer on pipe inner walls was completely removed, the epoxy internal coating remained intact (effective corrosion inhibitor protection), pipeline flow recovered to 92% of design value, pump energy consumption decreased by approximately 25%, with annual electricity savings of approximately RMB 180,000. Approximately 5.2 m³ of cleaning wastewater was neutralized to pH 7.0 with NaOH, treated by flocculation sedimentation, and discharged to the industrial park wastewater treatment plant meeting park standards. Post-cleaning operation over six months has maintained transport efficiency above 90% with no accelerated re-scaling, and the enterprise has adjusted the pipeline cleaning interval from 3 years to 2 years in its equipment management system.

6. Why Choose Danyang Blue Star Cleaning

Danyang Blue Star Anti-corrosion Cleaning Co., Ltd. has over 20 years of industrial cleaning experience and is a member of the China Industrial Cleaning Association, holding Grade A chemical cleaning qualification and high-pressure water jetting certification. We have served over 30 industrial enterprises in Huai'an and northern Jiangsu, spanning salt chemical, special steel, attapulgite processing, baijiu brewing, and food processing sectors. Our service advantages include:

• Salt Chemical Industry Expertise: Proven solutions for NaCl/Na₂SO₄/CaSO₄ composite salt scaling in brine pipelines, with alkali conversion + two-step acid cleaning successfully applied in multiple salt chemical projects, delivering high efficiency with minimal pipeline damage risk.
• Customized Formulations: Tailored cleaning agent formulas and corrosion inhibition schemes based on Hongze Lake water quality characteristics and different industry pipeline conditions. Carbon steel pipeline corrosion inhibition rate exceeds 99%; stainless steel achieves pitting resistance equivalent (PREN) meeting process requirements after passivation.
• Food-Grade Cleaning Capability: For baijiu and food processing enterprise CIP pipelines, we provide food-grade cleaning agent solutions with zero harmful residues and third-party testing reports, meeting HACCP and ISO 22000 food safety management requirements.
• Comprehensive Equipment: Multiple imported high-pressure water jetting units (500–1500 bar), chemical cleaning circulation pump stations, and online monitoring instruments (pH, conductivity, Ca²⁺/Fe²⁺/Fe³⁺) to meet diverse pipe diameters and operating conditions.
• Environmental Compliance: All cleaning wastewater is collected, neutralized, and treated to discharge standards with complete cleaning reports and treatment records, meeting the strict environmental regulatory requirements of the salt chemical park and Hongze Lake watershed.
• Rapid Response: Emergency contact points established in Huai'an, Suqian, and Lianyungang with 24/7 standby. Emergency pipe blockage or leak repair cleaning achieves 2-hour on-site response in city districts.

Danyang Blue Star Cleaning strictly implements ISO 9001 quality management and ISO 14001 environmental management systems. Every cleaning project is staffed with dedicated safety officers and quality inspectors, ensuring standardized full-process management from site survey and solution design to execution and acceptance delivery, with traceable quality and controllable risk. Choose Danyang Blue Star Cleaning for professional, reliable, and environmentally responsible one-stop pipeline cleaning services for your Huai'an and northern Jiangsu operations.