Fire Retardant Hydraulic Seals & Hose
The ISO has identified and classified 4 types of hydraulic fluids. This article touches on the importance of using fire retardant hydraulic seals.
There are several water based hydraulic fluids and most of them are used in the oil, mining, gas and construction industries. Most of these environments are hazardous, due to the volatile nature of the material or materials being mined/drilled for. As a result, the ISO has classified and set guidelines for the use of fire retardant hydraulic hose & seals, and the use of such materials. They are known as HFC, HFAE, HFAS and HFB.
According to an article on they state the ISO classification as
- “HFAE, which includes oil-in-water emulsions, typically with more than 80% water content;
- HFAS, which are synthetic aqueous fluids, typically containing more than 80% water;
- HFB, which are water-in-oil emulsions typically containing more than 40% water; and
- HFC (also known as glycol solutions, polyalkylene glycol solutions, and water glycols), which include water polymer solutions, typically containing more than 35% water”
HFC fuilds are the most commonly used fire resistant fluids in the world. We have found a really good article over at hydraulicspheumatics.com, and they a have a printable pdf document for your reading pleasure. We really recommend you have a read.
Hydra Seals are stockists of not high quality hydraulic seals and oils seals, but also a wide range of hydraulic hose. If you require fire retardant seals or hose, please contact us first with the specification of your requirement, we may be able to help you. Contact us here or over the phone at +353 1 8612700.
The Main Types of Hydraulic Seals
There are several types of Hydraulic Seals, which are available as Rod Seals, Piston Seals and Wiper Seals. Before you purchase a seal for whatever application you are using, there are a few requirements that need to be checked considered;
• Diameter of Inner Shaft
• Diameter of Outer Shaft
• The Radial Cross Section
• The Operation Speed
• Pressure and Temperature Placed Upon Seals in Operation
• Vacuum Rating
Types of Seals:
Piston Seals are used in hydraulic cylinders, and prevent fluid from flowing over the cylinder head by sealing against the cylinder bore. This application, the sealing lip is in contact with the housing bore and the seal is pressed within the shaft. Rod Seals are also used for preventing fluid from leaking. They are placed external to the cylinder bore. They would be considered a radial seal, and prevent fluid from leaking from within the cylinder to the outside. Symmetric Seals work equal or symmetric to piston/rod seals and Axial Seals make contact with or are “in-axis” with the housing components. There are two variations of Hydraulic Seals, one would be dynamic seals and the other is an Exclusion Seals.
Dynamic Seals prevent contamination to fluids by creating a void between moving and non-moving parts. These types of seals would be typically piston seals. Exclusion seals help keep debris from machine bearings and moving parts. Typical types of exclusion seals would be wiper seals, which wipe the debris away. There are also V seals and scraper seals within the exclusion seal range.
Hydra Seals are main hydraulic seal distributors in Ireland. We have been supplying many different types of hydraulic seals to the agricultural and manufacturing industries for 20 years. We have a proven track record and experience in fitting and calculating seal requirements for our clients and partners. We put together several Hydraulic Seal Kits, depending on the needs and requirements of the individual machine, vehicle or client needs. Contact us on 01 8612700 or drop us an email via our contact page.
Four Common Errors with Hydraulic Equipment
1. Not changing the hydraulic oil
Oil should be changed at the end of its usable life. Oil breaks down over time, resulting the degradation of the oils base and the depletion of any additives in the oil. There are many variables that determine when this time comes, from frequency of use, operation temperature and the environment that the oil is running. With the prices of oil continually rising, replacing too soon is costly and leaving running in the engine too long can have a damaging effect on the engines parts. Simply replacing after a specific period of time is not enough. The only true measure of oil usability would be to do a proper analysis.
2. 6 Believing Hydraulic Components are Self-Lubricating
Dont assume that all hydraulic components are self-lubricating. You cannot afford the luxury to assume a part will self lubricate if it fails to do so. What happens if the part fails and the result is a complete system break down. Nasty! Hydraulic components can be seriously damaged. In some cases, they may work OK for a while, but the harm incurred at start-up then dooms them to premature failure. Just ensure you have replaced the fluids/oil.
3. Letting the Machinery Run Too Hot
Just like an engine, the fastest way to burn or wear hydraulic seals or components is to run the engine or equipment too hot. The same rings true for all types of hydraulic components, and is not limited to hydraulic seals, but other materials such as hydraulic hose and the hydraulic oil itself. So how do you know that the system is running too hot? This really depends on the viscosity of the hydraulic oil and the type of components in the system. As oil temperature increases, viscosity decreases, and falls below the adequate required lubrication for the hydraulic seals. Temperatures above 82 degrees (Celsius) will damage most hydraulic hose and hydraulic seal components, and advance the degradation of the hydraulic oil base. For these reasons, it is vital to monitor core temperatures.
4. Using the Wrong Hydraulic Oil
We would consider that oil is the most important component of any hydraulic system. Hydraulic oil is not only a lubricant but is also the means to transfer power though the system. This dual role makes viscosity the most important factor as it affects the machine performance and life.
Oil viscosity will determine the maximum and minimum starting oil temperatures. Is the machine starting up in an extreme cold environment or operating in an extremely hot environment. If you use unsuitable oil in either of these environments, hydraulic failure of components or engines can occur.
Also, within these tolerances of temperature, we also have to deal with the power loses when oil viscosity is reduced, which will lead to power loss or even failure from friction and internal oil / hydraulic fluid leakage. Using the wrong viscosity oil will result in increased power consumption (diesel or electrical).
Always consult the manufacturer of your equipment to use the correct oil as specified on the equipment manual.
Contact Hydra Seals Hose & Bearings Limited for any Hydraulic Hose & Fittings and Seal Requirements.