I. Installation Key Points

Pretreatment Inspection

Before installation, check that the hose has no external damage, the bellows is free of deformation or cracks, and the sealing surfaces of flanges or joints are flat. This prevents issues caused by improper transportation or storage from affecting sealing performance.

Clean debris from pipe interfaces to ensure connection areas are free of impurities, avoiding blockages or internal wear.

Connection Operation

For flange connections: Align flange holes and tighten bolts evenly. Avoid excessive one-sided force that may twist the hose (diagonal step-by-step tightening is recommended).

For threaded connections: Wrap an appropriate amount of sealing tape (e.g., PTFE tape), hand-tighten first, then use tools to moderately secure—over-tightening may damage threads.

Avoid Excessive Displacement

Reserve sufficient expansion space during installation. Never force the hose to its maximum stretch or compression limit, as this reduces service life.

When used in vibrating pipes, ensure angular deviation between the hose and pipe stays within the allowable range to minimize additional stress.

Fixation and Protection

For long-distance installations, install supports near both ends of the hose to prevent damage from sagging due to weight or intensified vibration.

For corrosive media, add an outer protective sleeve; in high-temperature environments, keep the hose away from heat sources or use heat insulation measures.

II. Selection Criteria

Medium Characteristics

Corrosive media (e.g., acid/alkali solutions): Choose 316 stainless steel for bellows and braided mesh to enhance corrosion resistance.

High-temperature media (e.g., steam): Confirm the hose’s temperature resistance (typically -200℃ to 400℃, depending on the model) to avoid material aging.

High-pressure fluids: Select a hose with a pressure rating matching the working pressure (e.g., 1.6MPa, 2.5MPa). Ensure the rated pressure is ≥1.5 times the working pressure.

Working Condition Parameters

Nominal diameter: Must match the pipe; DN150 corresponds to an inner diameter of approximately 150mm.

Length: Determine based on displacement in the installation space, usually reserving 10%-20% expansion margin.

Connection type: Flanges (common pressure classes like PN16, PN25), threads (e.g., G, NPT standards), or quick connectors—must match pipe interfaces.

Environmental Factors

High-vibration scenarios (e.g., pump or compressor outlets): Choose models with reinforced braided mesh to improve fatigue resistance.

Outdoor or humid environments: Ensure metal components are galvanized or chrome-plated to prevent rust.

III. Typical Application Scenarios

Industrial piping systems: In chemical, petroleum, and metallurgical workshops, they connect pumps, valves, and pipes, absorbing vibration and thermal expansion/contraction displacement during equipment operation.

Building water supply and drainage: In vertical pipes of high-rise buildings, they compensate for pipe expansion due to temperature changes, reducing leakage risks at joints.

Heating systems: Connect radiators to main pipes, adapting to temperature-induced pipe expansion and ensuring stable operation.

Proper installation and selection of DN150 metal hoses effectively extend the service life of piping systems and reduce maintenance costs, making them indispensable flexible connectors in industrial and civil applications.