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High-pressure water jet (generally referring to water jets with operating pressures above 100 bar ) possesses extremely strong cutting and cleaning capabilities, but also carries extremely high risks 。Safety regulations must be strictly followed during use. The following are the most critical precautions:

I. Core Safety Principle: Life First!

High-pressure water jets are "invisible blades": ? Even if it looks like "water flow", its impact force is enough to cut metal, penetrate human tissue, and shatter bones 。Absolutely no games!

Operation is strictly prohibited without adequate safety protection!

II. Personal Protective Equipment - None Can Be Missing!

Full Body Protection:

High-pressure water jet protective suit: ? Must meet relevant safety standards and be able to resist high-pressure water penetration. Ordinary raincoats and work clothes are completely ineffective!

Matching Protection Level: ? The protection level of the protective suit must be higher than the maximum operating pressure of the equipment.

Hand Protection:

High-pressure water jet protective gloves: ? Must also meet standards and have cut-resistance, puncture-resistance, and waterproof functions.

Foot Protection:

Steel-toe steel-bottom, puncture-resistant, anti-slip, waterproof safety boots: ? Prevent falling objects, sharp object punctures, and water flow impact and water slippage.

Head Protection:

Safety helmet: ? Prevent falling objects from above and accidental collisions.

Eye/Face Protection:

Full-face shield or goggles: ? Must be able to resist high-pressure water impact and splashing debris. Ordinary safety glasses are far from enough 。

Hearing Protection:

Ear plugs or earmuffs: ? High-pressure equipment operation produces enormous noise, and long-term exposure damages hearing.

Respiratory Protection (as needed):

If the operation produces harmful dust, water mist, or uses chemical additives, appropriate respirators must be worn.

III. Pre-operation Preparation and Inspection - Eliminate Hidden Dangers

Thorough Training and Qualifications:

Operators must receive professional and rigorous high-pressure water jet safety operation training and pass the assessment.

Understand equipment performance, risk points, and emergency procedures.

Carefully Read the Manual:

Strictly follow the equipment manufacturer's operation and safety instructions.

Comprehensive Equipment Inspection:

High-pressure hoses: ? Check for bulges, cracks, wear, and signs of aging. Any damage must be replaced immediately!

Connectors and Joints: ? Ensure that all quick connectors and threaded connections are secure, leak-free, and undamaged. Use dedicated safety locking devices.

Spray Gun/Spray Wand: ? Check that the body, trigger mechanism, and safety lock are functioning normally. Ensure that the nozzle is securely installed, unobstructed, and of the correct type.

Pressure System: ? Check that the pressure gauge, pressure regulator, and safety valve (pressure relief valve) are functioning normally and within their calibration validity period.

Power Source: ? Check the engine/motor status, oil, cooling, cables (insulation, grounding), or air source lines.

Water Intake Filtration: ? Ensure that the filter is clean to prevent impurities from damaging the pump and nozzle.

Work Area Safety:

Set up a warning zone: ? Clearly mark the hazardous area with warning tape and barriers to prevent unauthorized personnel from entering.

Clean the Site: ? Remove obstacles, easily damaged items, and flammable materials.

Anti-slip Measures: ? The ground is slippery; ensure that the operator has a stable footing.

Ventilation: ? Ensure good ventilation for indoor operations, especially when using hot water or chemical additives.

Electrical Safety: ? Stay away from energized equipment, ensure good grounding of equipment (electric equipment), and use a ground fault circuit interrupter. It is strictly forbidden to use non-waterproof electrical equipment in damp environments!

Lighting: ? Ensure sufficient lighting in the work area.

Communication Confirmation:

When multiple people are working together, clearly define command signals and communication methods.

IV. Key Precautions During Operation

Pressure Control:

Use the lowest effective pressure: ? While ensuring cleaning/cutting effectiveness, use the lowest pressure possible to reduce risks and damage to the surface being treated.

Strictly prohibit exceeding the maximum pressure!

Spray Gun Control:

Always hold the spray gun firmly: ? Ensure a stable body posture to withstand recoil. Two-handed operation is safer.

Confirm direction before pulling the trigger: ? Nozzle Always point towards a safe work target area, absolutely never point at people, animals, your own body, equipment, electrical devices, pressure vessels, glass, fragile surfaces, etc.!

Maintain a safe distance: ? Based on the nozzle type, pressure, and material being treated, strictly maintain the minimum safe distance recommended by the manufacturer .

Continuous Movement: ? Absolutely prohibited to point the jet at the same point for an extended period (even a few seconds), as this can easily cause serious damage (material destruction, penetration) or accidental reflection injuries.

Correct Angle: ? Usually maintain a certain angle (e.g., 45°) with the work surface, rather than vertical, to improve efficiency and reduce rebound. Adjust the angle slightly when dealing with stubborn stains.

Release the trigger before moving: ? Before changing position or adjusting direction, be sure to release the trigger to stop the jet.

Use the nozzle guard (if equipped): ? Reduce water mist splashing and rebound.

Beware of rebound and splashing:

When the water stream impacts hard surfaces, gaps, or edges, it will inevitably produce unpredictable high-speed rebounding water streams and debris , which is one of the main sources of injury. Always pay attention to your own and others' positions.

Hose Management:

Avoid crushing, excessive bending, twisting, dragging, friction, or contact with high-temperature surfaces of the high-pressure hose.

Pay attention to your feet during operation to prevent tripping over the hose.

Regularly check the condition of the hose.

Equipment Malfunction Handling:

If abnormal pressure fluctuations, unusual noises, leaks, abnormal hose movement, or spray gun malfunction are detected, immediately release the trigger, turn off the equipment power source, and turn off the water source 。

Complete pressure release is required before troubleshooting!

V. Operation Completion and Equipment Shutdown - Safe Completion

Release pressure! Release pressure! Release pressure! (One of the most important steps)

Release the spray gun trigger.

Turn off the equipment power source (turn off the engine or cut off the power supply).

Turn off the water source.

Repeatedly pull the spray gun trigger multiple times until there is no water flow or gas emission , confirming that the system pressure has been completely released. Pressure gauge returns to zero!

Disconnect:

After confirming that the system is pressureless, disconnect the high-pressure hose, water inlet pipe, and other connections.

Draining and Antifreeze (Especially in cold environments):

According to the instructions, completely drain all liquids from the pump, hose, and spray gun. Remaining water freezing will cause the equipment to burst!

Gasoline engines should be run until the fuel is exhausted or a stabilizer is used.

Cleaning and Maintenance:

Rinse the exterior of the equipment and the nozzle.

Clean the water inlet filter.

Check all parts for wear and tear, and replace consumables (nozzles, seals, etc.) in a timely manner.

Site Cleanup:

Clean up water stains, oil stains, and debris in the work area.

Properly dispose of wastewater and waste liquid (especially those containing chemicals), complying with environmental regulations.

VI. Special Risk Emphasis

0° Nozzle (Needle-shaped jet): ? Extremely dangerous! ? Only for experienced personnel for special cutting/rust removal, requiring additional protection (such as bulletproof plates), maintaining an extremely long distance , strictly limiting the scope of use. Easily penetrates the human body!

Hot water jet: ? Increases the risk of burns, requiring additional protection (high-temperature protective clothing, gloves).

Confined spaces: ? Risks include suffocation, accumulation of harmful gases, low visibility, and difficulty escaping. A specialized plan and monitoring are required.

High-altitude work: ? Fall prevention measures are required, ensuring equipment stability, more difficult operation, and increased risks.

Underwater work: ? Specialized equipment and techniques are required; the risk is extremely high.

Summary of core principles:

Wear complete and qualified PPE! ? (Specialized protective clothing is the minimum requirement)

Thoroughly check for pressure relief before operation!

The nozzle must always be pointed at a safe target!

Maintain a safe distance and continuously move the spray gun!

Thoroughly relieve pressure after work is completed!

Respect the power of high-pressure water jets; they are not ordinary water pipes!

Any negligence can lead to catastrophic consequences! Strict adherence to regulations is the only way to ensure safety. ? For unfamiliar work or high-risk environments, be sure to seek guidance or services from professionals.