Deyuan Marine YQJ Series Tank Washing Machines: Modular Innovation Redefines New Benchmarks for Vessel Cargo Tank Cleaning

Developed and manufactured in strict compliance with the July 2025 Rules for the Classification of Steel Ships, Deyuan Marine’s YQJ series fixed and portable stainless steel tank washing machines meet high-end international shipping accessory standards across three core dimensions: compliance certification, material craftsmanship and cleaning performance. They deliver reliable domestic-made solutions for cargo tank cleaning of domestic and foreign oil tankers and bulk carriers.

The YQJ series consists of two major product lines: the YQJ-Q submersible fixed model for permanent installation inside cargo holds, and the YQJ-B portable model fitted with a 15-meter DN40 anti-static hose for mobile operation on deck. The pressure-bearing chambers, nozzles and housings of the entire unit are integrally cast from 316L stainless steel, offering outstanding resistance to corrosion by seawater and crude oil. Official guidelines specify that the equipment shall not be used for cleaning with nitric acid or hydrofluoric acid to avoid irreversible corrosion damage caused by strong acidic media.

Engineered to adapt to complex vessel navigation attitudes, the machines operate stably under working conditions including 15° vessel heel, 22.5° roll, 5° trim and 7.5° pitch. They withstand cleaning media temperatures up to 92°C, suiting operation across sea areas worldwide.

The product boasts remarkable core performance advantages. Equipped with dual nozzles, the unit realizes 360° full rotation of the main body plus 360° independent rotation of nozzles, completely eliminating blind cleaning zones inside tanks. The officially recommended optimal operating pressure range stands at 0.6–0.8 MPa, with full working condition coverage from 0.6 MPa to 1.2 MPa. Nozzle bore sizes range from 7 mm to 14 mm covering all standard specifications. Flow rate deviation of all models is controlled within ±5%, effective jet range deviation limited to 0–10%, and dynamic pressure remains stably above 7 kPa.

Take the certified model YQJ8Q (B) as an example: the variant with an 8 mm nozzle delivers a flow rate of 12.5–17 m³/h and an effective jet length of 12.5–14 meters. The large-bore YQJ14Q achieves a flow rate of 35 m³/h and a jet range of 19 meters at 0.8 MPa, enabling a larger single-unit tank coverage capacity. Full tank cleaning is completed through four rounds of spray circulation. The unit rotates at 2–3 revolutions per minute, finishing complete blind-spot-free cleaning in only 15 to 25 minutes, delivering over 40% higher cleaning efficiency compared with conventional integrated tank washing machines.

Breaking the drawbacks of integral disassembly and maintenance required by traditional tank washers, the YQJ series features an innovative split modular structure. The whole machine is divided into three independent assemblies: hydraulic pressure chamber, variable-speed transmission mechanism and automatic clutch nozzle, matched with standardized universal spare parts. Maintenance work can be carried out merely with a 4 mm hex key and a simple hammer without full unit disassembly.

The core transmission adopts wear-resistant PEEK turbine and PTFE bushings, featuring low abrasion and long-term lubrication-free operation, as the cleaning medium itself provides self-lubrication. The equipment comes with a standard two-year full-unit warranty upon factory delivery. Wearing parts including transmission gears and nozzle bushings can be purchased and replaced separately, drastically cutting vessel maintenance downtime and lowering long-term operation and maintenance costs for shipping fleets.

Multiple mature models including YQJ8Q (B), YQJ9Q, YQJ10B and YQJ14Q have been mass-produced and delivered, complete with full sets of mounting accessories such as welded base plates, support flanges and quick couplings compatible with mainstream marine pipeline standards.

Endowed with four core competitive edges—authoritative classification society certifications from BV and CCS, corrosion-resistant 316L stainless steel construction, long-range high-efficiency cleaning and lightweight easy maintenance—the YQJ series tank washing machines have secured bulk procurement orders from major domestic shipyards and ocean shipping enterprises. It has become the preferred domestic alternative to imported equipment for marine cargo tank cleaning.

Marine Tank Washing Machines - FAQ

1. What is the main purpose of marine tank washing machines?

A: They are primarily used for cleaning the interiors of cargo tanks on oil and chemical tankers, using high-pressure media to drive rotating nozzles for thorough cleaning.

2. What is the difference between fixed and portable tank washing machines?

A: Fixed machines are permanently installed inside tanks for dedicated systems like crude oil washing; portable units can be moved on deck with anti-static hoses for greater flexibility.

3. What materials are tank washing machines made of?

A: High-quality machines are cast from 316L stainless steel as a single piece, including the pressure chamber, nozzles and housing, resisting corrosion from seawater and crude oil.

4.Under what operating conditions can tank washing machines run stably?

A: They can operate under complex vessel motions including heel up to 15°, roll up to 22.5°, trim up to 5° and pitch up to 7.5°, with a maximum cleaning media temperature of 92℃.

5.What are the working pressure and flow rate of tank washing machines?

A: Recommended working pressure is 0.6-0.8MPa, covering 0.6-1.2MPa full range; nozzle sizes range from 7-14mm, with flow rates varying by model.

6.How long does a complete tank washing cycle take?

A: The machine rotates at 2-3 RPM, and a full four-cycle cleaning process takes only 15-25 minutes, improving efficiency by over 40% compared to traditional integrated washers.

7.How are tank washing machines maintained and repaired?

A: The modular design divides the machine into three independent components: pressure chamber, transmission mechanism and nozzles; maintenance requires only a 4mm hex wrench without full disassembly, with PEEK wear-resistant materials for long-term maintenance-free operation.

8.What classification society certifications are required for tank washing machines?

A: Quality products typically obtain type approval from authoritative classification societies such as BV and CCS, meeting high-end international shipping standards.

9.What precautions should be taken before tank washing operations?

A: The machine must be installed vertically with a strainer at the inlet to prevent blockage; flush pipelines before use to remove debris; each machine requires an independent stop valve and pressure gauge.

10.What types of cargo tanks can tank washing machines clean?

A: They are suitable for cleaning oil tanker cargo tanks, chemical tanker compartments, storage tank farms and various other liquid cargo tanks.