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Selecting the appropriate high-pressure hose is crucial for the safety, efficiency, and lifespan of a high-pressure water jetting system. Improper selection can lead to serious consequences such as hose bursts, connector detachment, excessive pressure drop, insufficient flow rate, or even personal injury. The following are key considerations and steps for matching high-pressure water jets with high-pressure hoses:

Core Matching Elements

Working Pressure:

The most critical parameter! ? The hose's maximum working pressure must be higher than the highest working pressure that may occur in the system. Safety Factor: 。

Generally, the hose's ? rated working pressure must be at least 至少是系统 Safety Factor: 1.5 times ? that of the system. For example, if the system's maximum working pressure is 2000 Bar, a hose with a rated working pressure of at least 3000 Bar should be selected. Consider Pressure Fluctuations:

Pressure peaks (water hammer effect) can occur during system start-up, shutdown, valve switching, and nozzle blockage. The selected hose must be able to withstand these transient high pressures. ? Clarify Requirements:

Is it for general cleaning (500-1500 Bar), or ultra-high-pressure cutting (2000-6000 Bar)? The pressure range difference is huge. ? Flow Rate (Inner Diameter):

Match Flow Rate Requirements:

The hose inner diameter determines the amount of water that can pass through per unit time. Too small an inner diameter will lead to: ? Excessive Flow Velocity:

Increased frictional losses (pressure drop), reducing the effective pressure at the nozzle. ? Decreased Efficiency:

A significant amount of the pump's output power is consumed in overcoming internal pipe friction. ? Increased Hose Wear:

High-velocity water flow accelerates liner wear. ? Avoid Excessively Large Inner Diameters:

While a larger inner diameter results in lower pressure drop, it can lead to: ? Heavy Hose:

Inconvenient operation, increasing operator fatigue. ? Increased Cost:

Generally, the larger the inner diameter, the higher the hose price. ? Increased Water Volume:

May exacerbate the water hammer effect during start-up/shutdown. ? Calculation Reference:

Calculate the required minimum inner diameter based on the pump's flow rate (L/min or GPM) and the system's maximum allowable flow velocity (generally, a water flow velocity of no more than 6-9 m/s or 20-30 ft/s is recommended to reduce pressure drop and wear). Consult the hose manufacturer or use a flow rate-inner diameter-flow velocity calculation chart. ? Media Compatibility:

Pure Water:

This is the most basic requirement, applicable to all high-pressure hoses. ? Additives:

Are cleaning agents, rust inhibitors, lubricants, and other chemical additives compatible with the hose liner and reinforcement layers? Confirmation is needed. ? Abrasive Water Jetting:

This is the most important distinction! ? Pure Water Hoses:

Absolutely prohibited ? for abrasive water jetting! Abrasives will quickly wear down or even cut the liner and reinforcement layers of pure water hoses, leading to rapid failure or even hose bursts. Abrasive-Specific Hoses:

Must be selected ? specifically designed for abrasive water jetting. These hoses typically have: Wear-Resistant Liner:

Such as specially formulated polyurethane or synthetic rubber, with extremely high wear resistance. ? Reinforcement Layer Design:

Structurally better able to resist abrasive cutting and wear. ? Connector Protection:

May have a special design to prevent abrasive accumulation or scouring at the connectors. ? Temperature Range:

Confirm that the hose can withstand the operating environment temperature and fluid temperature (including cold water during startup and warm water after prolonged operation). High temperatures accelerate hose aging.

Bending Radius:

The hose has its

minimum bending radius requirements. Using a bending radius smaller than this value will severely damage the hose structure (compressing the liner, damaging the reinforcement layer), significantly shortening its lifespan and creating safety hazards. Consider equipment layout and operational flexibility needs when selecting. More flexible hoses (smaller minimum bending radius) are usually more expensive.

Hose Length:

Sufficient is enough:

Excessively long hoses will increase pressure drop, cost, weight, and management difficulty. ? Consider the range of movement

考虑移动范围：? Ensure sufficient length for free movement of equipment or operators within the working range.

Avoid excessively short lengths: ? Excessively short lengths restrict operation and may cause pulling forces during equipment movement, damaging fittings or hoses.

Fittings:

Matching: ? The fittings at both ends of the hose must match the interfaces at the pump outlet, gun/spray wand inlet, intermediate connectors, etc. Perfect match (thread specifications, type, size, standard).

Type:

Permanent crimped type: ? Most reliable, highest pressure capacity, lowest leakage risk. Requires professional equipment for installation.

Reusable type: ? Convenient for on-site replacement, but pressure capacity and reliability are usually slightly lower than permanently crimped types; requires correct installation and maintenance.

Quick-disconnect fittings: ? Convenient for quick connection/disconnection, but requires selection of high-pressure specific quick-disconnect fittings; their rated pressure must match the hose and system. Note that quick-disconnect fittings themselves will also cause additional pressure drop.

Material: ? Usually stainless steel, corrosion-resistant and high-pressure resistant.

Installation quality: ? Extremely important! ? Even the most advanced hoses and fittings will result in catastrophic failure if improperly installed (e.g., inadequate crimping, thread damage, poor sealing). Must be installed by trained personnel using professional equipment.

Standards and certifications:

Choose products that meet relevant international/national standards.

Well-known brands usually offer better quality assurance and comprehensive technical support and warranties.

Summary of Matching Steps

Clarify application: ? Pure water cleaning? Abrasive cutting? What is the maximum pressure? What is the maximum flow rate? Common pressure/flow rate range? Working environment (temperature, chemicals)? Operating method (handheld/robot/fixed)?

Determine core parameters:

Maximum working pressure -> Hose rated working pressure (1.5 times safety factor).

Pump's maximum flow rate -> Hose minimum inner diameter (considering allowable flow rate).

Medium type -> Pure water hose or ? Abrasive-resistant hose 。

Consider operational requirements:

Required length.

Required minimum bending radius (flexibility).

Select fitting type: ? Determine system interface specifications (thread type, size), select appropriate fittings (permanent crimp/reusable/quick-disconnect) and ensure matching.

Consult manufacturer's information: ? Based on the parameters determined above (pressure, inner diameter, medium, bending radius), find the appropriate model in the product catalog or online selection tool of a reliable hose manufacturer (such as Parker, Graco, Gates, Alfa Laval/Alfagomma, RYCO, etc.).

Confirm details: ? Carefully check whether the temperature range, certification standards, minimum bending radius, weight, etc. of the selected model meet all requirements.

Professional installation: ? Provide the selection results and fitting requirements to a professional hose assembler, who will install them using the correct crimping equipment and parameters.

Safety Warning

Never mix: ? Pure water hose Strictly prohibited for use in abrasive systems! Abrasive hoses can be used in pure water systems (but may be more expensive and heavier).

Never exceed pressure: ? Strictly prohibited to exceed the rated working pressure indicated on the hose.

Regular inspection: ? Inspect the hose for bulges, wear, cuts, leaks, loose or rusted fittings, etc. before and after each use. If any abnormality is found, Immediately stop using and replace 。

Strictly prohibited to repair: ? Once a high-pressure hose is damaged (even just the outer layer), absolutely cannot be repaired , it must be replaced entirely. Any repair is extremely dangerous.

Follow lifespan: ? Hoses have a service life (usually calculated in working hours or years, affected by pressure, bending frequency, and operating environment). Even if the appearance is intact, it should be replaced after reaching the manufacturer's recommended service life.

Correct coiling: ? Coil naturally during storage and transportation to avoid sharp bends or knots.

Conclusion

Matching high-pressure water jet hoses is a technical task that requires careful attention. It is essential to select based on the three core elements of the system's maximum working pressure (considering the safety factor), maximum flow rate (determining the inner diameter), and medium type (pure water/abrasive). and fully consider the operational and safety requirements. Selecting well-known brands of abrasive-resistant hoses that meet standards (when used with abrasives), and having professionals install the connectors using the correct methods, is key to ensuring the system operates safely, efficiently, and has a long lifespan. Do not compromise or take risks when selecting hoses.

If you can provide specific application parameters (such as maximum pressure, flow rate, and whether abrasives are involved), I can recommend a more specific range of hose types. Safety first!