It's important to check the design factors of an EPDM hose to make sure it meets the standard. Higher design factors are associated to longer life but do not necessarily translate into better performance in the application. Some hoses can fail at lower pressures than they were designed. This is often due the specific requirements of the application. Many parameters can affect hose fatigue, including temperature, pulses of pressure, and damage. In addition, the length of time hoses are stored before use can have an effect on service life. ARPM and NAHAD recommend limiting fatigue.
The EPDM hose ruptured because of the steel wire layer in the EPDM hose.
The rupture of the steel wire layer of an EPDM hose is a common occurrence in service, and is caused by an abrasion or pinprick that releases trapped gas. A hose can also rupture due to excessive twisting. Twisting can cause the reinforcing layers to crack and lower their compressive strength. Therefore, it is important to ensure that the hose is not subjected to a torsional moment during use. It is also important to align the axes of the joints when installing a hose.
Another possible cause of a ruptured steel wire layer of an EPDM hose is improper installation of the hose. An improper installation can cause the hose's flexibility to be too great or the fitting to be too tight. In such cases, it is imperative to replace the entire hose assembly.
A close examination of the ruptured hose can reveal clues about the cause of rupture. You can cut the ruptured hose open and inspect it under a digital microscope. It will show the fracture origin and secondary cracks near the fracture site. Furthermore, the inside surface of the ruptured hose does not display any external debris or foreign particles, indicating that the rupture did not occur on the surface of the hose.
A sudden force is responsible for the deterioration in the steel wire layer. An EPDM hose's steel wire layer is subject to a shock load due to a sudden cyclical change in pressure. The shock load can cause permanent deformation of the metal hose if the hose fails.
the connection and sealing method of the EPDM hose
EPDM hoses are made to withstand extreme temperatures and pressures. They also meet the pressure requirements for industrial applications. These hoses undergo a post-sintering process to increase the number of molecular bonds. This enhances strength and wall thickness. It also helps to eliminate diffusion, which is when gas molecules escape from the pores of the hose.
EPDM hoses are used in many different applications, including vehicle hoods, windows, and trunk seals. They are also used to cool cooling system circuits. They connect components such as water pumps, thermostats, EGR coolers, and EGR heaters to other components, such as oil coolers or radiators. They can also be used for connecting charging air coolers or oil coolers.
Generally, an EPDM hose is marked with letter and number markings. Some hoses are also marked with a 5-digit manufacturer code. These markings indicate that the hose is being used. For example, a hose marked as "Skydrol" (tm) is intended for use with phosphate ester-base hydraulic fluids. However, different types of hoses may be suitable for different applications.
When choosing an EPDM hose, one should consider the media it will be exposed to. Some EPDM hoses can be used in both air and gas applications. Others may not. These hoses must comply with the standards for air and gas hoses.
The precautions of the EPDM Hose
There are a few key factors that need to be taken into consideration before evaluating an EPDM hose for pressure and temperature ratings. One of these is the design factor. The design factor is the relationship between the maximum pressure at which the hose can work and the pressure at which it is most likely to burst. The design factor is intended to provide a safety margin in case of unexpected hose ruptures. This can happen when the pressure suddenly increases or when the temperature rises significantly.
Another important factor to consider is the coupling and hose connection. These two components must be designed to function properly together and should be compatible. This ensures that the hose assembly will function correctly and safely. It is important to also consider the pressure rating for the fittings and couplings.
These are just a few of the considerations. You should also consider the application where your EPDM hose will be used. The size and type of hose needed, the temperature requirements, and the pressure required are all key factors. Also, consider the material to be transported with the hose.
The design factor is essential for a hose to perform in the intended application. Without the proper design factor, the hose will fail prematurely. This failure may lead to costly direct and indirect costs, and environmental impacts. It could also lead to downtime that could impact your top line revenue.