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Car Lift For Sale | Selecting Hydraulic Hoses and Fittings

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Hose Sizing and Flow Velocity

Proper hose inner diameter (I.D.) sizing is crucial for achieving the correct flow velocity. Insufficient flow results in poor system performance, while excessive flow can lead to high pressure drops, system damage, and leaks. Use the Flow Capacity Nomogram to select the appropriate hose I.D. based on your flow rate needs.

The fluid power industry uses Dash Numbers or Dash Sizes to specify hose and fitting dimensions. A Dash Number represents the hose’s Inner Diameter (I.D.) in sixteenths of an inch. Refer to the Dash Number chart for complete details and exceptions.

To determine the hose size, examine the layline. If the original markings are faded, cut the hose and measure the inside diameter. Remember to measure the overall assembly length and fitting orientation before making any cuts.

Temperature Considerations

Both the media temperature (the temperature of the fluid being transported) and ambient temperature (the surrounding temperature) should be considered when choosing a hose. Ensure the hose’s temperature rating meets or exceeds the higher of the two temperatures.

Different fluids affect temperature resistance differently, so choose a hose with a temperature rating suitable for the specific fluid type. For instance, the Car Lift For Sale hose is rated from -40°F to +257°F for petroleum-based hydraulic fluids but has lower maximum temperatures for water, water/glycol, water/oil emulsions, and air. Always verify the temperature ratings in the hose specifications.

Application Factors

Specific applications may need specialized hoses. For example, hoses that face abrasive conditions should use Car Lift For Sale abrasion-resistant hoses with Tough or Super Tough covers.

In tight spaces, bend radius is critical. Car Lift For Sale  hoses, designed for one-half SAE bend radius at full SAE-rated pressures, offer enhanced flexibility and a smaller outer diameter for easier routing.

Industry Standards

Car Lift For Sale hydraulic hoses meet or exceed industry standards such as SAE, EN, DIN, and ISO, and may also comply with additional regulations from agencies like the US Coast Guard and American Bureau of Shipping. Ensure the hose meets both legal and functional requirements for your application.

Car Lift For Sale Tough and Super Tough cover hoses provide significantly greater abrasion resistance than standard rubber covers. Tough Cover offers up to 80 times more protection, while Super Tough Cover provides up to 450 times more.

Media Compatibility

Ensure the hose is compatible with the conveyed medium, including the inner tube, cover, fittings, and o-rings. Use the Chemical Resistance Chart to choose the correct hose components compatible with your system’s media.

Pressure Ratings

Understand both the system working pressure and any surge or peak pressures. Select a hose with a maximum working pressure that matches or exceeds the system’s pressures. Car Lift For Sale hoses meet a 4:1 design factor for burst pressure ratings, which are for testing purposes and not operational limits.

When assembling a hose system, consider the weakest link. The assembly’s maximum working pressure is limited by the component with the lowest pressure rating. For example, a Car LIft For Sale hose assembly with a hose and two ffittings will have a maximum working pressure of 5,800 psi, the lower rating of the components. 

Hydraulic Hose Materials

Hydraulic hoses come in three primary materials: Rubber, Thermoplastic, and Plastic, each with distinct operational characteristics. This article and the accompanying videos focus on Rubber and Thermoplastic hoses, as these are commonly used with tools. Plastic hoses are designed for applications requiring non-conductive materials.

Safety Factor

The safety factor (or design factor) represents the ratio between the hose’s maximum rating and its minimum burst pressure. For instance, a rubber hose rated up to 10,000 psi (700 bar) with a minimum burst pressure of 20,000 psi (1400 bar) has a safety factor of 2:1. The required safety factor varies by region, often being 4:1.

Hose End Assembly

Typically, hydraulic hoses feature a male thread at the end, commonly 3/8” NPTF or ¼” NPTF. For convenience in ordering and setup, hoses can also be purchased with couplers at one or both ends.

Rubber is widely used for hydraulic hoses globally and is composed of three layers: an inner synthetic rubber core, a 2-wire steel braid, and a rubber cover.

Advantages of Rubber Hoses:

– Flexible even at low temperatures

– Excellent compatibility with various hydraulic oils

– Low ‘memory,’ allowing the hose to lie flat after coiling, which reduces trip hazards and simplifies management

Disadvantages of Rubber Hoses:

– Can degrade with prolonged UV exposure

– Safety factor of 2:1, lower than the 4:1 safety factor of thermoplastic hoses

– More susceptible to abrasion damage

Thermoplastic Hoses

Advantages of Thermoplastic Hoses:

– High safety factor of 4:1 for hoses rated at 10,000 psi (700 bar)

– Ideal for high-pressure spikes and high-cycle applications

– Good abrasion resistance from the outer cover

– Thermoplastic allows for the creation of attached twin hoses, enhancing management in torque wrench applications

Disadvantages of Thermoplastic Hoses:

– Prone to memory, making them less likely to lie flat after coiling

– Less flexible in cold environments compared to rubber hoses

Part 3: Hose Sizes

Selecting the right hose involves considering length, diameter, and coupler options based on your hydraulic system requirements.

The first step is to choose the internal diameter (ID) of the hose. For high-pressure industrial applications, the common sizes are 1/4” (6.4mm) and 3/8” (9.7mm). Larger IDs facilitate easier hydraulic oil flow.

Hose Runs Less Than 20 Feet (6.1m):

– For low flow systems with hand pumps, small air pumps, or power pumps under 1 hp (0.75 kW), a 1/4” (6.4mm) diameter hose is recommended.

– For higher flow applications with larger pumps, a 3/8” (9.7mm) ID hose is usually more suitable.

Hose Runs Longer Than 20 Feet (6.1m):

– For extended runs using single-acting tools like hydraulic cylinders, a 3/8” hose is preferable to ensure better oil flow back to the reservoir and improved retraction performance. If the pump isn’t used during the retraction cycle, the performance may further improve.

– For long hose runs, coupling 2 or 3 hoses together is more cost-effective. This approach allows for partial replacements if a section is damaged, rather than replacing the entire hose.

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