Hydraulic Hose Specifications | Mac Hydrualics

For each use of hydraulics, there is a specific hydraulic hose that is right for the job. Selecting the correct specifications for your hydraulic hose is important because the wrong choice could lead to damaging or injurious failures. While all hoses have finite and expected lifespans, there are many factors that contribute to when that lifespan will come to an end. By understanding the most prominent factors that contribute to hose lifespans and failures, you can make informed decisions regarding the type of hose required for any given situation.

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Hose Construction

Hydraulic hoses can be constructed out of a variety of different materials. These include composites, elastomers, metals, polymers, silicone, and thermoplastics, just to name a few. The materials used in the construction of a specific hose will determine the situations in which the hose is meant to be used and even the type of hydraulic fluid that flows through it. Each hose is made of three layers: The inner tubing, wire reinforcement, and exterior shell.

Inner Tubing

The inner tubing of hydraulic hoses is often made of plastic or rubber. This is the layer of the hose that comes into contact with the fluid and so must be made out of the correct material for the fluid type. For example, some fluids may break down rubber, and so a plastic construction would be needed instead. You do not want a hose interior that will react with or break down when it comes into contact with the fluid because that could lead to hose failure and damage throughout the rest of the hydraulic system.

Wire Reinforcement

There may be multiple reinforcing layers between the inner and outer layers of a hydraulic hose depending on the durability rating. Wire reinforcement layers can be made of metal, plastic, or textile depending on the flexibility and strength required. And, there are also two styles of wire reinforcement that additionally improve either flexibility or strength. Wire braid offers increased flexibility at the cost of some strength, while wire spiral offers increased strength at the cost of some flexibility. 

Reinforcement is used to counteract both internal and external pressure. Internal pressure is the main force the reinforcement acts against, as the highly pressurized hydraulic fluid presses against the walls of the inner tube. External pressure is less of an issue but can come into play in some specific situations.

Exterior Shell

The exterior shell of the hose protects the inner tube and wire reinforcement from the environment. Environmental dangers could come in the form of abrasion, wear, temperature, and even sunlight. This layer of the hose is made from rubber, plastic, metal, or textile. The exact material chosen will depend on where and how the hose is to be used. If the hose is going to be somewhere with more extreme environmental dangers, then it will need to be made of a more robust material.

Diameter and Length

Hose diameter and length both play a role in how the fluid within the hose behaves. The inner diameter is the diameter within the inner tubing through which the liquid flows. If the diameter is too small, it can lead to pressure drops and increased internal temperatures caused by friction with the tube walls. If it is too large, it can lead to suboptimal system performance due to the flow. Common inner diameter sizes range from 3/16in. To 25.in.

The outer diameter of the hose includes the three-layer structure of the hose as well as the inner diameter. By measuring the difference between the inner and outer diameters, you can get the thickness of the hose wall. This diameter is important to keep in mind when it comes to connection points

Hose length is much more important than you may have realized for a hydraulic system. The longer the hose is, the more potential there is for pressure drops. Just as with inner diameters that are too small, this is because there is more contact between the fluid and interior walls which creates friction. For this reason, it is essential that the hose is the proper length for the location where it is to be used.

Operating Conditions

Hydraulic hoses must be able to withstand the various conditions within which they are expected to operate. They may be used in environments that require increased abrasion and wear resistance, flexibility, pressure resistance, and/or temperature resistance.

Abrasion and Wear Resistance

The number one cause of hydraulic hose failure is abrasion and wear. This damage is caused when hoses rub against each other or other objects within or around the system. Even when you do not think the hoses will move to rub against other objects, the small amount of vibration from the fluid flowing can cause wear to occur over time. For this reason, it is important to consider how abrasion will come into play when routing hoses and avoid high-abrasion contact.

Hoses will also wear naturally both internally and externally over time. Because you cannot see internal wear, it is important to pay close attention to external wear. External wear can be accelerated by the hose being in direct sunlight, which can cause elastic materials to break down.

Flexibility

The flexibility of any given hose should be enough for their intended use, but not more or less flexible than that. An overly flexible hose will have reduced strength that may be needed. And a hose that is too rigid can suffer from three main issues. First, the hose should not be so rigid as to be difficult to bend around necessary turns; hoses should be bent, not twisted. Second, the hose should be flexible enough to fit into compact spaces if need be. And third, if the hose is required to move, such as if it is on the arm of machinery, it needs to be sufficiently flexible.

Some hoses are referred to as &#;lay-flat&#; which simply means that they do not have a rigid structure maintaining their shape. When there is no fluid pressure within them, they lay flay. These hoses are more flexible than standard hoses and take up less space to store.

Pressure Resistance

While external pressure on hoses usually is not an issue outside of specific environments, all hydraulic hoses must be able to withstand their internal pressures. Every hose has a maximum pressure rating printed on it. This rating should never be exceeded, even when there is a pressure spike. You should consider what the maximum pressure that could be caused by a spike is before selecting a hose for the job. Exceeding the pressure rating could lead to hoses bursting which may cause damage, injury, and downtime.

Some hydraulic systems are prone to variable internal pressures. The more variable the pressure is, the more it will negatively affect the hose. Constant pressure is relatively easy for hoses to handle, but the stresses associated with pressure variation can lead to excessive wear. For a variable pressure system, you will need a hose with increased strength and durability.

Temperature Resistance

Just as hoses have pressure ratings, they also have temperature range ratings. If a hose is used in conditions that are too hot for it, it could lead to the materials breaking down or even melting. If the temperatures are too cold, then the hose can become rigid, which leads to cracking. Also, you should be considering both the temperature inside and outside of the hose as they both play major roles in the overall temperature.

The temperature of the fluid within the hose can be in the hundreds of degrees celsius depending on the hydraulic system and specific fluid being used. If the internal structure of the hose cannot withstand this, it will fail. These temperatures are generated by the friction between the fluid and the interior walls of the hose. The higher the flow rate and pressure, the higher the fluid temperature will be.

Ambient temperatures can affect hydraulic hoses just as much as internal fluid temperatures. If the hose is part of a hydraulic system that operates outside, it can be exposed to a wide range of temperatures, including those below freezing. Variable temperatures, much like variable pressures, will cause hoses to wear more over time. Additionally, some hoses will be used in high-temperature environments where they are located within close proximity to heat sources such as generators and even furnaces.

Safety Qualities

Lastly, some specialty hoses come with specific safety qualities that make them ideal for potentially hazardous situations. Static-resistant hoses are made of conductive or semi-conductive materials that are able to dissipate built-up static electricity. This helps to prevent electrical fires from starting. Flame-resistant hoses are a bit different in that they do not prevent fires, but rather prevent fires from potentially becoming worse. These hoses are able to remain intact even in the presence of flames, which prevents them from bursting and fueling the fire with hot hydraulic fluid.

MAC Hydraulics

At MAC Hydraulics, we know the importance of preventative maintenance, especially when it comes to hydraulic hoses. Since these are the most vulnerable parts of any hydraulic system, they need to be checked regularly for signs of damage and wear. Contact us today if your hydraulic system is in need of maintenance or repair. Our expert technicians will keep your hydraulics in peak condition.

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The basics of hydraulic hose construction

Hydraulic hoses are essentially made up of three elements: an inner tube that carries the fluid, one or more reinforcement layers that support the tube, and a cover that protects the hose from damage caused by abrasion or UV and ozone exposure.

Inner Tube: The inner tube is the core component of a hydraulic hose, responsible for containing and transporting the hydraulic fluid. This tube is usually made from synthetic rubber or thermoplastics, which are selected based on their compatibility with various types of hydraulic fluids and their ability to withstand different operating temperatures and pressures.

Reinforcement Layer: This layer is crucial for providing the necessary strength and flexibility to the hose. Typically made from steel wire or textile, the reinforcement layer is designed to support the inner tube and enable the hose to withstand high-pressure demands. Steel wire reinforcements are used for more rigorous, high-pressure applications, while textile reinforcements are employed in lower pressure scenarios.

Outer Cover: The outer cover of the hydraulic hose serves as a protective layer against environmental factors such as UV radiation, extreme temperatures, abrasion, and chemical exposure. Usually made of durable materials like synthetic rubber or thermoplastics, the cover is essential in safeguarding the hose&#;s structural integrity and longevity, especially in harsh working conditions.

9 Key hydraulic hose specifications

Understanding the key hydraulic hose specifications is paramount. These specifications &#; encompassing materials, temperature range, diameters, pressure ratings, and more &#; fundamentally determine a hose&#;s performance, durability, and suitability for specific applications. Below I examine these critical aspects that affect the efficiency and reliability of hydraulic hoses in various industrial scenarios.

1. Materials (tube, reinforcement, cover)

• Tube materials: The tube material is selected based on its compatibility with the type of hydraulic fluid it will carry. Common materials include nitrile, which is used for oil-based fluids due to its excellent oil resistance, and PTFE (Polytetrafluoroethylene), known for its exceptional resistance to corrosive media. The choice of tube material significantly affects the hose&#;s performance and durability.
• Reinforcement materials: The reinforcement layer is pivotal in determining the hose&#;s overall strength and flexibility. Steel wire is typically used for high-pressure applications, as it provides superior strength and durability. On the other hand, textile materials are chosen for lower pressure applications, offering a good balance of flexibility and strength, suitable for less demanding environments.
• Cover materials: The cover material is designed to protect the hose from external damage and degradation. Materials such as neoprene are commonly used due to their good resistance to weather, oil, and abrasion. The cover&#;s resilience ensures the hose can withstand tough external conditions, extending its usable life and maintaining its performance.

2. Temperature range

Specifies the operational temperature limits of the hose. For example, standard hoses might operate between -40°F and +212°F, but special materials can extend this range.

3. Hose inside diameter (I.D.)

The inside diameter of a hydraulic hose is a key determinant of the flow rate and velocity of the hydraulic fluid. A larger I.D. is essential in high flow rate applications, as it helps reduce the pressure drop and mitigate heat generation, thereby enhancing the efficiency and safety of the hydraulic system.

4. Hose outside diameter (O.D.)

The outside diameter of the hose is crucial, especially when it comes to fitting the hose into tight spaces and through various routing paths. The O.D. also significantly influences the bend radius of the hose, affecting its flexibility and how it can be installed in confined areas.

5. Working pressure

The working pressure rating of a hydraulic hose denotes the maximum pressure that the hose is designed to handle safely. For instance, a hose rated at psi is tailored for use in high-pressure hydraulic systems, ensuring reliability and performance under intense pressure conditions.

6. Minimum burst pressure

The minimum burst pressure specification is typically set at four times the working pressure of the hose. This figure serves as a crucial safety margin, indicating the pressure at which the hose is likely to fail, thereby providing a measure for the hose&#;s strength and reliability in extreme conditions.

7. Minimum bend radius (MBR)

The minimum bend radius is another important hydraulic hose specifications. It indicates the smallest radius to which the hose can be safely bent without causing damage or compromising its structural integrity. A smaller MBR is advantageous as it provides greater flexibility in the installation and routing of the hose, especially in complex or confined setups.

8. Vacuum

This specification indicates the hose&#;s ability to withstand vacuum or suction pressures without collapsing. This characteristic is particularly important in applications where the hose is subjected to vacuum conditions, ensuring that it maintains its shape and functionality under such pressure differentials.

9. Recommended application/fluid compatibility

This specification details the specific types of hydraulic fluids or applications for which the hose is suited. It is critical for ensuring chemical compatibility between the hose materials and the hydraulic fluids used, as well as for optimal performance and longevity of the hose in its designated application.

Standards and certifications in Canada

Standardization of hydraulic hoses is crucial to ensure safety and efficiency in various industries. In Canada, there are several standards associated with hydraulic hoses, including the following:

• ISO: , , ,
• SAE: J517, J, J, J, J
• FMVSS 106

Of all these standards, three in particular stand out: ISO , SAE J517 and FMVSS 106.

The ISO standard is a significant international standard, providing requirements for ten classes, four grades and seven types of wire- or textile-reinforced hydraulic hose. Its objective is to establish a universal standard that can be applied worldwide, reducing the complexity of working with hydraulic hose on international projects.

The SAE J517 standard was developed by the Society of Automotive Engineers. It specifies dimensional and performance requirements for various types of hydraulic hose and is particularly important for automotive, industrial and hydraulic applications in North America.

Finally, FMVSS 106 (Federal Motor Vehicle Safety Standard 106) defines the requirements for hydraulic brake hoses, assemblies and fittings used in motor vehicles. It ensures that hoses are capable of withstanding high pressures and temperatures while resisting deterioration due to brake fluids and external conditions.

In conclusion

Understanding the many hydraulic hose specifications is fundamental to facilitating the selection of the right hose for your hydraulic system. By carefully considering factors such as inner and outer diameters, working pressure, burst pressure, bending radius and fluid compatibility, you can choose the hose that best suits your system without compromising safety and performance. Consult our complete guide to hydraulic hose selection for more information and if in doubt, call on the hydraulic hose experts at Marshall Equipment.

At Marshall Equipment, we offer a wide variety of hydraulic hoses from well-known brands such as Gates and Dixon. Our experts in hydraulic and pneumatic hoses and fittings can help you choose the right hose for your application and even perform hydraulic hose assembly and repair for you. Visit our products and services sections to discover the full range of our products and services.

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